feat(apple/input): desktop (absolute) mouse mode on macOS — remote-desktop sweep M1

Folds the parked client-side-cursor machinery (cursorMode auto/always/ never, hidden while disabled) into the cross-client mouse model: MouseInputMode capture|desktop under DefaultsKey.mouseMode, picked in Settings ▸ Keyboard & mouse (macOS), resolved at session start and gated off on gamescope hosts (relative-only EIS). Desktop model = the un-neutered absolute path with the SDL cursor policy: pointer never disassociated (enters/leaves the stream freely), monitor forwards letterboxed absolute positions, and the local cursor hides only while over the view via an invisible-cursor rect (the host's composited cursor is the one you see; AppKit manages the rect, so no hide/unhide balancing). ⌘⇧C becomes ⌃⌥⇧M — the same chord as the SDL clients — flipping the model live with an atomic release/re-engage. Verified: swift build + full test suites green (macOS arm64). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
feat(client/input): desktop (absolute) mouse mode — remote-desktop sweep M1
2026-07-22 00:03:19 +02:00 · 2026-07-21 23:52:16 +02:00
358 changed files with 11417 additions and 52731 deletions
@@ -1,12 +1,9 @@
-# The root build context is used by web/Dockerfile (which needs web/ and
-# api/openapi.json) and by ci/rust-ci-arm64cross.Dockerfile (which needs the toolchain
-# pin). Allowlist those; keep everything else (target/, .git, crates) out of the
-# context upload.
+# Root build context is used only by web/Dockerfile, which needs web/ and
+# api/openapi.json. Allowlist those; keep everything else (target/, .git, crates)
+# out of the context upload.
 *
 !web
 !api/openapi.json
-!rust-toolchain.toml
-!ci/pf-host-cc
 web/node_modules
 web/.output
 web/dist
@@ -46,23 +46,13 @@ jobs:
        # SHA-pinned: this workflow's release job carries the signing keystore + Play service-account
        # secrets, so a moved tag on a third-party action could exfiltrate them. v3 = 9fc6c4e.
        uses: android-actions/setup-android@9fc6c4e9069bf8d3d10b2204b1fb8f6ef7065407 # v3
-        with:
-          # Only platform-tools — NOT the action's default legacy `tools`, whose dependency chain
-          # drags in the ~250 MB emulator nobody here runs (instrumentation tests are deferred).
-          # That download was the single flakiest piece of this job: the shared runner fleet drops
-          # packets under parallel-job load and sdkmanager's streamed unzip turns a truncated
-          # stream into "Error on ZipFile unknown archive" (observed 2026-07-22, twice).
-          packages: platform-tools

      - name: NDK r30 + platform 36 + build-tools + CMake (libopus cross-build)
        # cmake;3.22.1 installs cmake + ninja under $ANDROID_SDK/cmake/3.22.1/bin — the exact path
        # kit/build.gradle.kts prepends to PATH for cargo-ndk's audiopus_sys (libopus) CMake build.
-        # Note: platforms;android-37 is sometimes missing from standard channels; AGP will
+        # Note: platforms;android-37 is sometimes missing from standard channels; AGP will 
        # auto-download it if needed during the build.
-        # retry.sh: sdkmanager is a single-shot multi-hundred-MB fetch, exactly the class the
-        # helper exists for (fleet-load packet drops truncate the stream mid-unzip); a failed
-        # attempt leaves no partial package behind, so a plain re-invoke is safe.
-        run: bash scripts/ci/retry.sh 4 sdkmanager "platform-tools" "platforms;android-36" "build-tools;37.0.0" "ndk;30.0.14904198" "cmake;3.22.1"
+        run: sdkmanager "platform-tools" "platforms;android-36" "build-tools;37.0.0" "ndk;30.0.14904198" "cmake;3.22.1"

      - name: Caches (cargo + gradle)
        uses: actions/cache@v4
@@ -1,39 +0,0 @@
-# Announce a stable release to the Discord #releases channel.
-#
-# This is the deliberate "go" step for a release. Release notes live in the repo at
-# docs/releases/<tag>.md and are seeded into the Gitea release body at creation by the build
-# workflows (scripts/ci/gitea-release.sh), so the release is never noteless. Once every
-# platform's CI is green for a tag, dispatch this workflow with that tag: it re-asserts the notes
-# file over the live release and posts a formatted embed to #releases.
-#
-# Manual on purpose — pressing "go" is the quality gate that says "all platforms built, notes are
-# final, tell the community." It is NOT wired to the tag push, so a half-built or failed release
-# is never announced. Stable-only: a -rc/pre-release tag is refused unless allow_prerelease=true.
-#
-# Requires the repo secret DISCORD_RELEASE_WEBHOOK (the #releases channel webhook URL); GITEA auth
-# reuses REGISTRY_TOKEN like the other release workflows.
-name: announce
-
-on:
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: "Release tag to announce (e.g. v0.18.0)"
-        required: true
-      allow_prerelease:
-        description: "Announce even if the tag is a pre-release (-rc)"
-        required: false
-        default: "false"
-
-jobs:
-  announce:
-    runs-on: ubuntu-24.04
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Post release announcement to Discord
-        env:
-          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-          DISCORD_RELEASE_WEBHOOK: ${{ secrets.DISCORD_RELEASE_WEBHOOK }}
-          ALLOW_PRERELEASE: ${{ inputs.allow_prerelease }}
-        run: bash scripts/ci/discord-announce.sh "${{ inputs.tag }}"
@@ -61,43 +61,6 @@ jobs:
      - name: Test (unit + loopback + proptest + C ABI harness)
        run: cargo test --workspace --locked

-      # The GPU encode backends are OFF by default, so every step above compiles ~none of them:
-      # `nvenc` gates enc/linux/nvenc_cuda.rs (+ nvenc_core/nvenc_status) and `vulkan-encode` gates
-      # enc/linux/vulkan_video.rs (+ the vendored vk_av1_encode/vk_valve_rgb bindings) — ~8,150
-      # lines carrying ~70 `unsafe` blocks. Their ONLY prior CI coverage was deb.yml's
-      # `cargo build`, where warnings are not errors, so pf-encode's own
-      # `#![deny(clippy::undocumented_unsafe_blocks)]` — the crate's stated unsafe-proof gate —
-      # was never actually enforced on them. (`pyrowave` needs no extra step: punktfunk-host has
-      # `default = ["pyrowave"]`, so the steps above already cover it.)
-      #
-      # `--all-targets` is load-bearing, not decoration: without it the feature-gated
-      # `#[cfg(test)]` modules are never compiled, which is exactly how all ten
-      # `NvencCudaEncoder::open` call sites in nvenc_cuda.rs's tests drifted to the wrong arity
-      # (E0061 x10) without any job noticing.
-      #
-      # GPU-free: every test needing real hardware is `#[ignore]`d, and NVENC/CUDA resolve their
-      # entry points at RUNTIME (dlopen), so the test binary links without a driver present.
-      # (On MSVC the same crate link-imports those symbols instead, which is why windows-host.yml
-      # can only type-check these tests via clippy — see the note there.)
-      #
-      # Scoped to `-p pf-encode` with ITS OWN feature names: punktfunk-host has no code gated on
-      # `nvenc`/`vulkan-encode` (its only `cfg(feature)` sites are the two `pyrowave` ones in
-      # capture.rs, and pyrowave is default-on, so the steps above already cover them). Going
-      # through `--features punktfunk-host/...` would force punktfunk-host into the selection and
-      # re-run its entire test suite a second time for no extra coverage.
-      #
-      # `pyrowave` is listed explicitly even though it is punktfunk-host's default: selecting only
-      # `-p pf-encode` takes the host out of the resolution, and pf-encode's own default is empty.
-      # Naming it keeps this the SHIPPED Linux feature set — deb.yml builds
-      # `--features punktfunk-host/nvenc,punktfunk-host/vulkan-encode` WITHOUT
-      # `--no-default-features`, so the .deb carries nvenc + vulkan-encode + pyrowave together, and
-      # that combination is what deserves the lint.
-      - name: Clippy + test the feature-gated Linux encode backends
-        run: |
-          cargo clippy -p pf-encode --all-targets --locked \
-            --features nvenc,vulkan-encode,pyrowave -- -D warnings
-          cargo test -p pf-encode --locked --features nvenc,vulkan-encode,pyrowave
-
      - name: C ABI harness (standalone link proof)
        run: bash crates/punktfunk-core/tests/c/run.sh

@@ -108,53 +71,6 @@ jobs:
          git diff --exit-code include/punktfunk_core.h \
            || (echo "include/punktfunk_core.h is stale — commit the regenerated header" && exit 1)

-  # The client stack cross-checked for aarch64. NOT an artifact job — deb.yml ships those —
-  # this exists so a portability defect fails here instead of surfacing in a release build or
-  # on a user's board. It earns its runtime: the bug that motivated it (a Vulkan extension
-  # array typed `*const i8`, where `c_char` is signed on x86_64 and UNSIGNED on aarch64)
-  # compiled cleanly on every target CI built at the time.
-  #
-  # Client crates only, listed explicitly: the host's encode stack is x86 (NVENC/QSV/AMF) and
-  # `--workspace` would drag it in. Runs in the cross image (amd64 toolchain + arm64 sysroot,
-  # ci/rust-ci-arm64cross.Dockerfile) on the ordinary runner — no arm64 runner involved.
-  rust-arm64:
-    runs-on: ubuntu-24.04
-    container:
-      image: git.unom.io/unom/punktfunk-rust-ci-arm64cross:latest
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Cache keys
-        run: echo "rustc=$(rustc --version | cut -d' ' -f2)" >> "$GITHUB_ENV"
-      - uses: actions/cache@v4
-        with:
-          path: |
-            /usr/local/cargo/registry
-            /usr/local/cargo/git
-          key: cargo-home-${{ hashFiles('Cargo.lock') }}
-          restore-keys: cargo-home-
-      - uses: actions/cache@v4
-        with:
-          path: target
-          # Its OWN prefix: aarch64 artifacts must never share the amd64 jobs' target cache.
-          key: cargo-target-arm64-v1-${{ env.rustc }}-${{ hashFiles('Cargo.lock') }}
-          restore-keys: cargo-target-arm64-v1-${{ env.rustc }}-
-
-      - name: Clippy for aarch64 (deny warnings)
-        run: |
-          cargo clippy --target aarch64-unknown-linux-gnu --all-targets --locked \
-            -p punktfunk-core -p pf-client-core -p pf-presenter -p pf-console-ui \
-            -p punktfunk-client-session -p punktfunk-client-linux \
-            -- -D warnings
-
-      # The minimal embedded build — no Skia, no PyroWave — is what a small image installs, so
-      # it has to keep compiling on its own, not just as a subset of the default features.
-      - name: Build the session binary, minimal features
-        run: |
-          cargo build --release --target aarch64-unknown-linux-gnu --locked \
-            -p punktfunk-client-session --no-default-features
-
  web:
    runs-on: ubuntu-24.04
    container:
@@ -1,13 +1,9 @@
 # Build the punktfunk .debs and publish them to Gitea's Debian package registry, so Ubuntu
-# boxes get new builds via `apt update && apt upgrade`. Three jobs, all publishing to the same
+# boxes get new builds via `apt update && apt upgrade`. Two jobs, both publishing to the same
 # apt distribution/component:
 #
 #   build-publish       — client + web + scripting, on the Ubuntu 26.04 rust-ci image (the client
 #                         needs 24.04-absent libs: SDL3, GTK4 ≥ 4.20).
-#   build-publish-client-arm64
-#                       — the same client package for arm64, CROSS-compiled on the same amd64
-#                         runner in the rust-ci-arm64cross image. No host counterpart: the Linux
-#                         host's encode stack is x86 (NVENC/QSV/AMF).
 #   build-publish-host  — the HOST, on the Ubuntu 24.04 rust-ci-noble image with a from-source
 #                         FFmpeg 8 BUNDLED into the .deb. This lowers the host's glibc floor to 2.39
 #                         and removes the hard `Depends: libavcodec62`, so the ONE host .deb installs
@@ -273,94 +269,3 @@ jobs:
          for DEB in dist/*.deb; do
            upsert_asset "$RID" "$DEB"
          done
-
-  # ---------------------------------------------------------------------------------------------
-  # The aarch64 CLIENT .deb. Cross-compiled on the ordinary amd64 runner in the
-  # punktfunk-rust-ci-arm64cross image (the rust-ci toolchain + an arm64 multiarch sysroot — see
-  # ci/rust-ci-arm64cross.Dockerfile); there is no arm64 runner in the fleet and none is needed.
-  # Client only, by decision: the Linux host encodes with NVENC/QSV/AMF, all x86.
-  # Publishes to the same distribution/component as the amd64 jobs — the apt registry keys pool
-  # entries by arch, so `apt` on an arm64 box picks this one up with no client-side configuration.
-  build-publish-client-arm64:
-    runs-on: ubuntu-24.04
-    container:
-      image: git.unom.io/unom/punktfunk-rust-ci-arm64cross:latest
-    timeout-minutes: 90
-    steps:
-      - uses: actions/checkout@v4
-
-      # Byte-identical to build-publish's version step (pf-version.sh is deterministic per
-      # commit), so the arm64 package always shares the amd64 version line.
-      - name: Version + channel
-        run: |
-          eval "$(bash scripts/ci/pf-version.sh)"
-          SHORT=$(echo "$GITHUB_SHA" | cut -c1-8)
-          case "$GITHUB_REF" in
-            refs/tags/v*) V="${GITHUB_REF_NAME#v}"; DIST=stable ;;
-            *)            V="${PF_BASE}~ci${GITHUB_RUN_NUMBER}.g${SHORT}"; DIST=canary ;;
-          esac
-          echo "VERSION=$V" >> "$GITHUB_ENV"
-          echo "DISTRIBUTION=$DIST" >> "$GITHUB_ENV"
-          echo "package version $V -> apt distribution '$DIST' (arm64)"
-
-      # dpkg-shlibdeps + dpkg-deb. The arm64 link deps themselves are the cross image's whole
-      # point and are already baked in; python3 is for scripts/ci/gitea-release.sh.
-      - name: dpkg-dev
-        run: |
-          apt-get update
-          apt-get install -y --no-install-recommends dpkg-dev python3
-
-      - name: Cache keys
-        run: echo "rustc=$(rustc --version | cut -d' ' -f2)" >> "$GITHUB_ENV"
-      - uses: actions/cache@v4
-        with:
-          path: |
-            /usr/local/cargo/registry
-            /usr/local/cargo/git
-          key: cargo-home-${{ hashFiles('Cargo.lock') }}
-          restore-keys: cargo-home-
-      - uses: actions/cache@v4
-        with:
-          path: target
-          # Its OWN key — these are aarch64 artifacts under target/aarch64-unknown-linux-gnu/
-          # and must never share the amd64 jobs' target cache.
-          key: cargo-target-arm64-v1-${{ env.rustc }}-${{ hashFiles('Cargo.lock') }}
-          restore-keys: cargo-target-arm64-v1-${{ env.rustc }}-
-
-      - name: Build the arm64 client .deb
-        env:
-          PUNKTFUNK_BUILD_VERSION: ${{ env.VERSION }}   # stamped into the binaries (build.rs)
-        run: |
-          git config --global --add safe.directory "$PWD"
-          ARCH=arm64 TARGET=aarch64-unknown-linux-gnu \
-            bash packaging/debian/build-client-deb.sh
-          # Fail here rather than shipping an amd64 binary under an arm64 package name.
-          readelf -h target/aarch64-unknown-linux-gnu/release/punktfunk-session \
-            | grep -q AArch64 || { echo "ERROR: session binary is not AArch64"; exit 1; }
-
-      - name: Publish to the Gitea apt registry
-        env:
-          TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-        run: |
-          for DEB in dist/*.deb; do
-            echo "uploading $DEB"
-            NAME=$(dpkg-deb -f "$DEB" Package)
-            VER=$(dpkg-deb -f "$DEB" Version)
-            ARCH=$(dpkg-deb -f "$DEB" Architecture)
-            curl -fsS -o /dev/null --user "enricobuehler:$TOKEN" -X DELETE \
-              "https://$REGISTRY/api/packages/$OWNER/debian/pool/$DISTRIBUTION/$COMPONENT/$NAME/$VER/$ARCH" || true
-            curl -fsS --user "enricobuehler:$TOKEN" --upload-file "$DEB" \
-              "https://$REGISTRY/api/packages/$OWNER/debian/pool/$DISTRIBUTION/$COMPONENT/upload"
-          done
-          echo "published arm64 client to $OWNER/debian $DISTRIBUTION/$COMPONENT"
-
-      - name: Attach the arm64 .deb to the Gitea release (stable tags only)
-        if: startsWith(gitea.ref, 'refs/tags/v')
-        env:
-          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-        run: |
-          . scripts/ci/gitea-release.sh
-          RID=$(ensure_release "$GITHUB_REF_NAME" "$GITHUB_REF_NAME" auto)
-          for DEB in dist/*.deb; do
-            upsert_asset "$RID" "$DEB"
-          done
@@ -99,41 +99,3 @@ jobs:
            mkdir -p ~/unom-flatpak/site/repo
            cd ~/unom-flatpak
            docker compose -f compose.production.yml up -d
-
-  winget:
-    runs-on: ubuntu-24.04
-    timeout-minutes: 10
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Sync winget source compose + server
-        uses: appleboy/scp-action@917f8b81dfc1ccd331fef9e2d61bdc6c8be94634 # v0.1.7
-        with:
-          host: ${{ inputs.deploy_host || secrets.DEPLOY_HOST }}
-          username: ${{ secrets.DEPLOY_USER }}
-          port: ${{ secrets.DEPLOY_PORT }}
-          key: ${{ secrets.DEPLOY_SSH_KEY }}
-          # Land all three flat in ~/unom-winget/ (drop the packaging/winget/server/ prefix).
-          source: "packaging/winget/server/compose.production.yml,packaging/winget/server/server.mjs,packaging/winget/server/handler.mjs"
-          target: "~/unom-winget"
-          strip_components: 3
-          overwrite: true
-
-      - name: Start winget REST source
-        uses: appleboy/ssh-action@0ff4204d59e8e51228ff73bce53f80d53301dee2 # v1.2.5
-        with:
-          host: ${{ inputs.deploy_host || secrets.DEPLOY_HOST }}
-          username: ${{ secrets.DEPLOY_USER }}
-          port: ${{ secrets.DEPLOY_PORT }}
-          key: ${{ secrets.DEPLOY_SSH_KEY }}
-          script: |
-            set -euo pipefail
-            # ./data/data.json is NOT shipped by this workflow — windows-host.yml rsyncs it on each
-            # stable tag (same content/config split as the flatpak repo). Ensure the bind-mount
-            # source exists so the container starts; it serves 503 until the first catalogue lands.
-            mkdir -p ~/unom-winget/data
-            cd ~/unom-winget
-            docker compose -f compose.production.yml up -d
-            # Surface a missing catalogue here rather than letting winget report "no package found".
-            sleep 3
-            curl -fsS http://127.0.0.1:3240/healthz || echo "NOTE: no catalogue yet - publish a stable tag to populate it"
@@ -2,7 +2,6 @@
 #   punktfunk-web      — management console (web/Dockerfile, repo-root context)
 #   punktfunk-docs     — documentation site (docs-site/Dockerfile)
 #   punktfunk-rust-ci  — Rust CI builder image consumed by ci.yml
-#   punktfunk-rust-ci-arm64cross — the above + an arm64 sysroot, for the aarch64 client legs
 #   punktfunk-fedora-rpm — Fedora 43 builder image consumed by rpm.yml (Bazzite RPM)
 # Host and clients are intentionally NOT containerized (see CLAUDE.md "What's left").
 #
@@ -81,41 +80,6 @@ jobs:
          docker push "$REGISTRY/$OWNER/${{ matrix.image }}:latest"
          case "$GITHUB_REF" in refs/tags/v*) docker push "$REGISTRY/$OWNER/${{ matrix.image }}:${GITHUB_REF_NAME}" ;; esac

-  # The aarch64 CROSS builder — a SEPARATE job because it is `FROM punktfunk-rust-ci:latest`
-  # and so must not race the matrix entry that publishes that base. Consumed by the arm64
-  # client legs in deb.yml/rpm.yml/arch.yml. Root context: it needs rust-toolchain.toml to
-  # install the target against the toolchain the workspace actually pins.
-  build-push-arm64cross:
-    runs-on: ubuntu-24.04
-    needs: build-push
-    timeout-minutes: 45
-    env:
-      IMAGE: punktfunk-rust-ci-arm64cross
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Login to registry
-        run: |
-          echo "${{ secrets.REGISTRY_TOKEN }}" \
-            | docker login "$REGISTRY" -u enricobuehler --password-stdin
-
-      - name: Build
-        run: |
-          EXTRA=""
-          case "$GITHUB_REF" in refs/tags/v*) EXTRA="-t $REGISTRY/$OWNER/$IMAGE:${GITHUB_REF_NAME}" ;; esac
-          docker build --pull \
-            -f ci/rust-ci-arm64cross.Dockerfile \
-            -t "$REGISTRY/$OWNER/$IMAGE:latest" \
-            -t "$REGISTRY/$OWNER/$IMAGE:sha-${GITHUB_SHA::8}" \
-            $EXTRA \
-            .
-
-      - name: Push
-        run: |
-          docker push "$REGISTRY/$OWNER/$IMAGE:sha-${GITHUB_SHA::8}"
-          docker push "$REGISTRY/$OWNER/$IMAGE:latest"
-          case "$GITHUB_REF" in refs/tags/v*) docker push "$REGISTRY/$OWNER/$IMAGE:${GITHUB_REF_NAME}" ;; esac
-
  # Deploy the docs site to unom-1, the DMZ services VM website/cms also deploy to
  # (docs.punktfunk.unom.io via Caddy on home-reverse-proxy-1 -> :3220). Same secret set
  # as unom/website's deploy: DEPLOY_HOST/DEPLOY_USER/DEPLOY_PORT/DEPLOY_SSH_KEY (the
@@ -73,20 +73,33 @@ jobs:
      # sufficient — the Tooling step's dnf install pulls a systemd package upgrade whose RPM
      # trigger re-runs authselect and regenerates this file, undoing the fix. It's reapplied
      # there, right before the first `flatpak` network call.
-      - name: Fix container DNS (drop nss-resolve)
+      - name: Fix container DNS (drop nss-resolve, resolve over TCP)
        run: |
          sed -i 's/resolve \[!UNAVAIL=return\] //' /etc/nsswitch.conf
-          # History: this step used to ALSO force glibc onto TCP DNS (`options use-vc`) because
-          # the runner fleet's Docker embedded resolver dropped UDP lookups under parallel-job
-          # load (investigated 2026-07-11; v0.15.0/v0.16.0 each burned retry.sh's whole budget).
-          # That root cause is now fixed at the infra level (2026-07-22): the runner host runs a
-          # local dnsmasq cache on the docker bridge and daemon.json points every job container
-          # at it, so lookups terminate on-box instead of crossing the saturated uplink — the
-          # UDP path is reliable again. The TCP path through the same chain proved FLAKY under
-          # fleet concurrency (flatpak remote-add failed 10/10 with instant NXDOMAIN while dnf
-          # in the same container resolved fine), so `use-vc` flipped from mitigation to sole
-          # cause of this leg's failures — removed. retry.sh (10×) stays as the backstop for
-          # genuine upstream blips.
+          # Resolve over TCP instead of UDP. The documented root cause of the flathub
+          # bootstrap failures (investigated 2026-07-11, see the Tooling step) is this box's
+          # Docker embedded resolver at 127.0.0.11 DROPPING UDP lookups while the shared
+          # runner fleet is saturated — a datagram nobody retransmits, so the lookup just
+          # times out. The answer then was to widen retry.sh's budget to 10 attempts (~9 min),
+          # which is enough to outlast a main push's ~8-workflow fan-out but NOT a TAG push's
+          # 13: v0.15.0 (twice) and v0.16.0 each burned all 10 attempts and failed the job,
+          # each needing a manual re-run.
+          #
+          # `use-vc` makes glibc use TCP, where the kernel retransmits and the query cannot be
+          # silently lost under load. Same resolver, same search path — only the transport
+          # changes, so internal names (git.unom.io) resolve exactly as before; deliberately
+          # NO extra nameservers, which would risk answering an internal name from a public
+          # resolver. Docker's embedded DNS serves TCP on 127.0.0.11:53 as well as UDP.
+          # retry.sh stays as the backstop for genuine upstream blips.
+          #
+          # Non-fatal: Docker bind-mounts /etc/resolv.conf and can present it read-only, and a
+          # DNS tuning that cannot be applied must not be what fails the release build — that
+          # would trade an occasional re-run for a hard stop. Falling back to UDP just restores
+          # today's behaviour, which retry.sh already covers.
+          if ! grep -q '^options .*use-vc' /etc/resolv.conf 2>/dev/null; then
+            echo 'options use-vc timeout:3 attempts:3' >> /etc/resolv.conf \
+              || echo "::warning::could not set use-vc (read-only resolv.conf?); staying on UDP"
+          fi
          cat /etc/resolv.conf || true

      # fedora:43 has no node, but actions/checkout (a JS action) needs it. A plain `run:` step
@@ -39,25 +39,6 @@ jobs:
        working-directory: plugin-kit
        run: bun install --frozen-lockfile --ignore-scripts

-      # bun 1.3 installs a `file:` dependency by copying its DIRECTORIES but symlinking each
-      # top-level FILE to itself — `node_modules/@punktfunk/host/package.json -> package.json`, a
-      # dangling self-reference. `dist/` therefore arrives intact while the manifest that points at
-      # it does not, so module resolution dies at the first step and every `@punktfunk/host` import
-      # reads as "cannot find module". Replacing the tree with a real copy is the whole fix; drop
-      # this step once bun links `file:` deps correctly again.
-      - name: "Repair the file: dependency (bun 1.3 self-symlink)"
-        working-directory: plugin-kit
-        run: |
-          # -f follows the link, so this is true only when the manifest actually resolves.
-          if test -f node_modules/@punktfunk/host/package.json; then
-            echo "bun linked it correctly — this step can go"
-          else
-            rm -rf node_modules/@punktfunk/host
-            cp -R ../sdk node_modules/@punktfunk/host
-          fi
-          test -f node_modules/@punktfunk/host/package.json
-          test -f node_modules/@punktfunk/host/dist/index.d.ts
-
      - name: Typecheck
        working-directory: plugin-kit
        run: bun run typecheck
@@ -393,76 +393,6 @@ jobs:
            -authenticationKeyID "${{ secrets.ASC_API_KEY_ID }}" \
            -authenticationKeyIssuerID "${{ secrets.ASC_API_ISSUER_ID }}"

-      - name: iOS — export .ipa (Gitea release + run artifact)
-        # The TestFlight step above uploads straight to App Store Connect (destination=upload) and
-        # leaves NO .ipa on disk. Re-export the SAME archive with destination=export to get an
-        # App Store distribution-signed .ipa for the Gitea release + the run artifacts. Same gate as
-        # that archive; a warn+skip (never fails the best-effort iOS leg) if the archive is absent,
-        # e.g. a workflow_dispatch with testflight=false. NOTE: an App Store-signed .ipa installs
-        # only via TestFlight/App Store, not by direct sideload — it's a release/archival artifact.
-        if: gitea.event_name != 'workflow_dispatch' || inputs.testflight == 'true'
-        id: ios_ipa
-        run: |
-          ARCHIVE="$RUNNER_TEMP/Punktfunk-ios.xcarchive"
-          if [ ! -d "$ARCHIVE" ]; then
-            echo "::warning::iOS archive not found — skipping .ipa export"
-            exit 0
-          fi
-          PROFILE="Punktfunk iOS App Store Distribution"
-          WIDGET_PROFILE="Punktfunk iOS Widgets App Store Distribution"
-          # destination=export writes the .ipa to -exportPath; otherwise identical manual signing to
-          # the upload plist (both profiles, Apple Distribution). No ASC key needed — no network.
-          cat > "$RUNNER_TEMP/export-appstore-ipa.plist" <<EOF
-          <?xml version="1.0" encoding="UTF-8"?>
-          <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-          <plist version="1.0">
-          <dict>
-            <key>method</key><string>app-store-connect</string>
-            <key>destination</key><string>export</string>
-            <key>teamID</key><string>$TEAM_ID</string>
-            <key>signingStyle</key><string>manual</string>
-            <key>signingCertificate</key><string>Apple Distribution</string>
-            <key>provisioningProfiles</key>
-            <dict>
-              <key>io.unom.punktfunk</key><string>$PROFILE</string>
-              <key>io.unom.punktfunk.widgets</key><string>$WIDGET_PROFILE</string>
-            </dict>
-          </dict>
-          </plist>
-          EOF
-          DEVELOPER_DIR="$XCODE_DEV_DIR" xcodebuild -exportArchive \
-            -archivePath "$ARCHIVE" \
-            -exportOptionsPlist "$RUNNER_TEMP/export-appstore-ipa.plist" \
-            -exportPath "$RUNNER_TEMP/export-ipa"
-          SRC=$(ls "$RUNNER_TEMP/export-ipa/"*.ipa 2>/dev/null | head -1)
-          [ -n "$SRC" ] || { echo "::warning::no .ipa was produced by export"; exit 0; }
-          mkdir -p "$GITHUB_WORKSPACE/dist"
-          IPA="$GITHUB_WORKSPACE/dist/Punktfunk-$VERSION.ipa"
-          mv "$SRC" "$IPA"
-          echo "IPA=$IPA" >> "$GITHUB_ENV"
-          echo "ipa=dist/Punktfunk-$VERSION.ipa" >> "$GITHUB_OUTPUT"
-          echo "exported $IPA"
-
-      - name: Attach .ipa to the workflow run
-        if: steps.ios_ipa.outputs.ipa != ''
-        # v3, not v4: Gitea's artifact backend identifies as GHES, which upload-artifact@v4 refuses
-        # (same reason as android.yml / apple.yml). Download is a zip of the .ipa.
-        uses: actions/upload-artifact@v3
-        with:
-          name: punktfunk-ios-ipa
-          path: ${{ steps.ios_ipa.outputs.ipa }}
-          if-no-files-found: warn
-          retention-days: 30
-
-      - name: Attach .ipa to the Gitea release (stable tags only)
-        if: startsWith(gitea.ref, 'refs/tags/v') && steps.ios_ipa.outputs.ipa != ''
-        env:
-          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-        run: |
-          . scripts/ci/gitea-release.sh
-          RID=$(ensure_release "$GITHUB_REF_NAME" "$GITHUB_REF_NAME" auto)
-          upsert_asset "$RID" "$IPA" "Punktfunk-$VERSION.ipa"
-
      - name: tvOS — archive + upload to TestFlight
        # Canary + stable, the same track as iOS/macOS — the tvOS xcframework slice is now built
        # on every apple push (above), so this matches the iOS step's gate exactly.
@@ -50,23 +50,6 @@ on:
      # builds — without these, encoder changes only reached this workflow via Cargo.lock luck.
      - 'crates/pf-encode/**'
      - 'crates/libvpl-sys/**'
-      # …and the rest of the W6 subsystem crates this build compiles. pf-encode was listed while
-      # the crates it speaks (pf-frame's CapturedFrame/PixelFormat/dxgi vocabulary, pf-gpu's
-      # adapter selection, pf-zerocopy, pf-host-config) were not, so a change that broke the
-      # Windows host through one of THEM reached main with no Windows build at all — the same
-      # Cargo.lock-luck gap the two lines above were added to close.
-      - 'crates/pf-frame/**'
-      - 'crates/pf-gpu/**'
-      - 'crates/pf-zerocopy/**'
-      - 'crates/pf-host-config/**'
-      - 'crates/pf-capture/**'
-      - 'crates/pf-win-display/**'
-      - 'crates/pf-vdisplay/**'
-      - 'crates/pf-inject/**'
-      - 'crates/pf-paths/**'
-      - 'crates/pf-driver-proto/**'
-      - 'crates/pf-clipboard/**'
-      - 'crates/pyrowave-sys/**'
      - 'packaging/windows/**'
      - 'scripts/windows/**'
      - 'web/**'
@@ -171,58 +154,10 @@ jobs:
        # build minutes earlier). Linting in release reuses those native build-script artifacts (no
        # openh264 rebuild), and keeps everything in one C:\t\release tree. Same reason
        # pf-vkhdr-layer's clippy below runs --release.
-        #
-        # pf-encode and pf-capture are linted SEPARATELY with --all-targets so their Windows
-        # `#[cfg(test)]` modules are type-checked — pf-encode's AMF C-ABI layout assertions
-        # (`variant_layout_matches_c` and friends, which are the only guard on a hand-mirrored
-        # vtable ABI), the QSV tests, the PyroWave-Windows smoke test; pf-capture's `StallWatch`
-        # tests, the DXGI HDR self-tests and the cursor-conversion tables. The host lint above
-        # cannot cover them: `-p punktfunk-host` only builds those crates as dependencies, so their
-        # test targets are never compiled anywhere, and that blind spot is what let the Linux twin's
-        # tests rot to the wrong arity unnoticed. pf-capture has no cargo features, so it needs no
-        # feature juggling and pulls in no extra dep tree.
-        # NOTE: for the HOST and pf-encode, clippy (a check, no link step) is deliberately the
-        # vehicle — `cargo test` with `nvenc` cannot LINK on MSVC: nvidia-video-codec-sdk
-        # link-imports NvEncodeAPICreateInstance / NvEncodeAPIGetMaxSupportedVersion, which resolve
-        # only against the driver's import lib. (On Linux the same crate dlopens them, so ci.yml can
-        # and does run the tests there.) Running them here would need an `--features amf-qsv,qsv`
-        # build without `nvenc`, i.e. a third full dep tree on a runner that already trips C1069 —
-        # not worth it while ci.yml executes the same tests.
-        #
-        # That reasoning does NOT extend to pf-capture: it has no encoder dependency at all
-        # (`cargo tree -p pf-capture` lists no nvidia/ffmpeg/libvpl/pyrowave), so its test binary
-        # links against nothing this runner lacks, and it reuses the release artifacts the steps
-        # above already built. Its Windows `#[test]`s — StallWatch, the f16 conversions, the cursor
-        # truth table, the IDD generation masking — are Windows-only code that NO other job can
-        # execute, so linting them was leaving real coverage on the table. See the run step below.
        run: |
          cargo clippy --release -p punktfunk-host --features nvenc,amf-qsv,qsv -- -D warnings; if ($LASTEXITCODE) { throw "host clippy" }
-          cargo clippy --release -p pf-encode --all-targets --features nvenc,amf-qsv,qsv -- -D warnings; if ($LASTEXITCODE) { throw "pf-encode clippy" }
-          cargo clippy --release -p pf-capture --all-targets -- -D warnings; if ($LASTEXITCODE) { throw "pf-capture clippy" }
          cargo clippy --release -p punktfunk-tray -- -D warnings; if ($LASTEXITCODE) { throw "tray clippy" }

-      - name: Test (pf-capture, Windows)
-        shell: pwsh
-        # The only Rust tests that RUN on Windows CI. pf-capture's `#[cfg(target_os = "windows")]`
-        # test modules cover code no Linux job compiles, let alone executes: 19 declared, of which
-        # 18 execute here — the IDD-push StallWatch state machine and ring-generation masking
-        # (idd_push.rs), the cursor shape→wire truth table (idd_push/cursor_poll.rs), and
-        # `f32_to_f16` including the rounding-carry / saturation edges the HDR P010 path depends on
-        # (dxgi/selftest.rs). All 18 are pure — no Win32, no device, no desktop. The 19th,
-        # `hdr_p010_selftest_intel_1080_live`, is `#[ignore]`d because it needs a real Intel
-        # adapter; it stays a manual `-- --ignored` run on the validation boxes. Until this step
-        # the whole set was type-checked by the clippy line above and nothing more.
-        #
-        # --release for the same reason as the clippy step: it reuses C:\t\release instead of
-        # spawning a second debug dep tree (the C1069 disk-exhaustion trigger). If this step ever
-        # starts tripping C1069 anyway, record THAT here rather than quietly dropping the step.
-        #
-        # The link question this step turns on was settled empirically before it was added: the same
-        # command was run on a Windows dev box against a workspace checkout and linked + executed
-        # cleanly, building in ~51 s off an existing release target dir.
-        run: |
-          cargo test --release -p pf-capture; if ($LASTEXITCODE) { throw "pf-capture tests" }
-
      - name: Build + lint the HDR Vulkan layer (pf-vkhdr-layer)
        shell: pwsh
        # Standalone cdylib (own [workspace]) the installer bundles + registers (it lets Vulkan games
@@ -359,90 +294,3 @@ jobs:
          foreach ($f in @($env:HOST_SETUP_PATH, $env:HOST_CER_PATH)) {
            if ($f -and (Test-Path $f)) { Upsert-GiteaAsset -ReleaseId $rid -File $f }
          }
-
-      # winget manifests for the release just attached above. Runs AFTER the attach step so the
-      # InstallerUrl the manifest pins is already live — winget validates the URL + hash, and a
-      # manifest published ahead of its artifact is a hard 404 for every client that picks it up.
-      # Stable tags only: winget pins one immutable artifact per version, so the rolling `canary/`
-      # alias has nothing it could point at.
-      - name: Emit + attach winget manifests (stable tags only)
-        if: startsWith(gitea.ref, 'refs/tags/v')
-        shell: pwsh
-        env:
-          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-        run: |
-          & scripts/ci/winget-manifest.ps1 `
-            -Version $env:HOST_VERSION -InstallerPath $env:HOST_SETUP_PATH -OutDir C:\t\out\winget
-          . scripts/ci/gitea-release.ps1
-          $rid = Ensure-GiteaRelease -Tag $env:GITHUB_REF_NAME -Name $env:GITHUB_REF_NAME -Prerelease 'auto'
-          foreach ($f in (Get-ChildItem C:\t\out\winget -Filter *.yaml)) {
-            Upsert-GiteaAsset -ReleaseId $rid -File $f.FullName
-          }
-
-  # Republish the winget REST source on unom-1 once the release above carries its manifests.
-  #
-  # A separate Linux job, not another step in `package`: the deploy actions are Docker-based and do
-  # not run on a Windows runner. `needs: package` also gives the ordering that matters — build-data
-  # reads the manifests from the release, so it must not run before they are attached.
-  winget-source:
-    needs: package
-    if: startsWith(gitea.ref, 'refs/tags/v')
-    runs-on: ubuntu-24.04
-    timeout-minutes: 10
-    steps:
-      - uses: actions/checkout@v4
-
-      # build-data re-derives the WHOLE catalogue from the releases rather than appending this one,
-      # so the result cannot drift and re-running any tag reproduces it byte for byte.
-      - name: Build + test the source catalogue
-        working-directory: packaging/winget/server
-        run: |
-          set -euo pipefail
-          npm install --no-audit --no-fund
-          node build-data.mjs --out data/data.json
-          # A wrong response SHAPE does not fail loudly — winget just reports "no package found".
-          # Gate on the suite before anything reaches the box.
-          node test.mjs
-
-      # Content only. server.mjs/handler.mjs/compose land via deploy-services.yml, matching how the
-      # flatpak repo's content and config deploy on separate paths.
-      - name: Ship the catalogue to unom-1
-        uses: appleboy/scp-action@917f8b81dfc1ccd331fef9e2d61bdc6c8be94634 # v0.1.7
-        with:
-          host: ${{ secrets.DEPLOY_HOST }}
-          username: ${{ secrets.DEPLOY_USER }}
-          port: ${{ secrets.DEPLOY_PORT }}
-          key: ${{ secrets.DEPLOY_SSH_KEY }}
-          source: "packaging/winget/server/data/data.json"
-          target: "~/unom-winget/data"
-          strip_components: 4
-          overwrite: true
-
-      # No restart: server.mjs reloads on mtime change. This only proves the new catalogue is the
-      # one actually being served, and fails the release if it is not.
-      - name: Verify the served catalogue
-        uses: appleboy/ssh-action@0ff4204d59e8e51228ff73bce53f80d53301dee2 # v1.2.5
-        with:
-          host: ${{ secrets.DEPLOY_HOST }}
-          username: ${{ secrets.DEPLOY_USER }}
-          port: ${{ secrets.DEPLOY_PORT }}
-          key: ${{ secrets.DEPLOY_SSH_KEY }}
-          script: |
-            set -euo pipefail
-            curl -fsS http://127.0.0.1:3240/healthz
-            echo
-            curl -fsS -X POST http://127.0.0.1:3240/manifestSearch \
-              -H 'content-type: application/json' -d '{"FetchAllManifests":true}' \
-              | grep -q "${GITHUB_REF_NAME#v}" \
-              || { echo "served catalogue does not contain ${GITHUB_REF_NAME#v}"; exit 1; }
-            echo "winget source serving ${GITHUB_REF_NAME#v}"
-          # `env:` below populates the RUNNER's environment; this action runs `script` on the
-          # REMOTE host, which inherits nothing from it. `envs:` is the action's OWN input —
-          # it must live under `with:` (matching docker.yml/deploy-services.yml's REGISTRY_TOKEN
-          # forwarding) — naming the variables to forward into the remote shell. A prior fix put
-          # it as a step-level sibling of `with:`/`env:` instead: that key is not part of the
-          # step schema, so appleboy/ssh-action never received it as an input and the step kept
-          # failing ("GITHUB_REF_NAME: unbound variable") on every tag after 24d2f97e too.
-          envs: GITHUB_REF_NAME
-        env:
-          GITHUB_REF_NAME: ${{ gitea.ref_name }}
@@ -1020,13 +1020,6 @@ dependencies = [
 "subtle",
 ]

-[[package]]
-name = "display-disturb"
-version = "0.21.0"
-dependencies = [
- "windows 0.62.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "displaydoc"
 version = "0.2.6"
@@ -1466,16 +1459,6 @@ dependencies = [
 "version_check",
 ]

-[[package]]
-name = "gethostname"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bd49230192a3797a9a4d6abe9b3eed6f7fa4c8a8a4947977c6f80025f92cbd8"
-dependencies = [
- "rustix",
- "windows-link 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.17"
@@ -2201,7 +2184,7 @@ dependencies = [

 [[package]]
 name = "latency-probe"
-version = "0.21.0"
+version = "0.17.2"

 [[package]]
 name = "lazy_static"
@@ -2306,7 +2289,7 @@ dependencies = [

 [[package]]
 name = "libvpl-sys"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "bindgen",
 "cmake",
@@ -2341,7 +2324,7 @@ checksum = "0ceec5bc11778974d1bcb055b18002eba7f4b3518b6a0081b3af5f21666da9ad"

 [[package]]
 name = "loss-harness"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "punktfunk-core",
 ]
@@ -2830,7 +2813,7 @@ checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"

 [[package]]
 name = "pf-capture"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ashpd",
@@ -2846,12 +2829,11 @@ dependencies = [
 "tokio",
 "tracing",
 "windows 0.62.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "x11rb",
 ]

 [[package]]
 name = "pf-client-core"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ash",
@@ -2875,7 +2857,7 @@ dependencies = [

 [[package]]
 name = "pf-clipboard"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ashpd",
@@ -2893,7 +2875,7 @@ dependencies = [

 [[package]]
 name = "pf-console-ui"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ash",
@@ -2914,7 +2896,7 @@ dependencies = [

 [[package]]
 name = "pf-encode"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ash",
@@ -2938,7 +2920,7 @@ dependencies = [

 [[package]]
 name = "pf-ffvk"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "ash",
 "bindgen",
@@ -2947,7 +2929,7 @@ dependencies = [

 [[package]]
 name = "pf-frame"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "libc",
@@ -2959,7 +2941,7 @@ dependencies = [

 [[package]]
 name = "pf-gpu"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "pf-host-config",
@@ -2973,11 +2955,11 @@ dependencies = [

 [[package]]
 name = "pf-host-config"
-version = "0.21.0"
+version = "0.17.2"

 [[package]]
 name = "pf-inject"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ashpd",
@@ -2988,7 +2970,6 @@ dependencies = [
 "pf-driver-proto",
 "pf-host-config",
 "pf-paths",
- "pf-win-display",
 "punktfunk-core",
 "reis",
 "tokio",
@@ -3006,14 +2987,14 @@ dependencies = [

 [[package]]
 name = "pf-paths"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "tracing",
 ]

 [[package]]
 name = "pf-presenter"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ash",
@@ -3028,11 +3009,10 @@ dependencies = [

 [[package]]
 name = "pf-vdisplay"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ashpd",
- "bitflags",
 "bytemuck",
 "futures-util",
 "hex",
@@ -3055,12 +3035,11 @@ dependencies = [
 "wayland-client",
 "wayland-scanner",
 "windows 0.62.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "x11rb",
 ]

 [[package]]
 name = "pf-win-display"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "pf-paths",
@@ -3072,7 +3051,7 @@ dependencies = [

 [[package]]
 name = "pf-zerocopy"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ash",
@@ -3081,7 +3060,6 @@ dependencies = [
 "libloading",
 "serde",
 "serde_json",
- "tempfile",
 "tracing",
 ]

@@ -3280,7 +3258,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-client-android"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "android_logger",
 "jni",
@@ -3296,7 +3274,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-client-linux"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "async-channel",
@@ -3312,7 +3290,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-client-session"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "pf-client-core",
@@ -3327,7 +3305,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-client-windows"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "async-channel",
 "ffmpeg-next",
@@ -3346,7 +3324,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-core"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "aes-gcm",
 "bytes",
@@ -3378,7 +3356,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-host"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "aes",
 "aes-gcm",
@@ -3462,7 +3440,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-probe"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "mdns-sd",
@@ -3476,7 +3454,7 @@ dependencies = [

 [[package]]
 name = "punktfunk-tray"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "anyhow",
 "ksni",
@@ -3499,7 +3477,7 @@ checksum = "d55d956fa96f5ec02be2e13af0e20391a5aa83d6a074e3ad368959d0fab299ea"

 [[package]]
 name = "pyrowave-sys"
-version = "0.21.0"
+version = "0.17.2"
 dependencies = [
 "bindgen",
 "cmake",
@@ -5908,23 +5886,6 @@ version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"

-[[package]]
-name = "x11rb"
-version = "0.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9993aa5be5a26815fe2c3eacfc1fde061fc1a1f094bf1ad2a18bf9c495dd7414"
-dependencies = [
- "gethostname",
- "rustix",
- "x11rb-protocol",
-]
-
-[[package]]
-name = "x11rb-protocol"
-version = "0.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea6fc2961e4ef194dcbfe56bb845534d0dc8098940c7e5c012a258bfec6701bd"
-
 [[package]]
 name = "x509-parser"
 version = "0.16.0"
@@ -28,7 +28,6 @@ members = [
    "clients/session",
    "clients/windows",
    "clients/android/native",
-    "tools/display-disturb",
    "tools/latency-probe",
    "tools/loss-harness",
 ]
@@ -49,7 +48,7 @@ exclude = [
 ndk = { path = "clients/android/native/vendor/ndk" }

 [workspace.package]
-version = "0.21.0"
+version = "0.17.2"
 edition = "2021"
 rust-version = "1.82"
 license = "MIT OR Apache-2.0"
@@ -96,7 +96,7 @@ Windows host also ships as a signed installer (all-vendor: NVIDIA, AMD, Intel).
 | **Bazzite / Fedora Atomic** (systemd-sysext) | `sudo bash punktfunk-sysext.sh install` *(no layering, no reboot; rpm-ostree + bootc also supported)* | [Bazzite](https://docs.punktfunk.unom.io/docs/bazzite) |
 | **Fedora** (dnf) | `dnf install punktfunk punktfunk-web` *(after adding the repo)* | [Fedora — KDE](https://docs.punktfunk.unom.io/docs/fedora-kde) |
 | **Arch / Steam Deck** (pacman / sysext) | `pacman -Sy punktfunk-host` *(binary repo)* · sysext `.raw` *(SteamOS)* | [packaging/arch](packaging/arch/README.md) |
-| **Windows** (11 22H2+, x64) | `winget install unom.PunktfunkHost` *(after `winget source add -n punktfunk https://winget.punktfunk.unom.io -t Microsoft.Rest`)* · or the signed `setup.exe` from the package registry | [Windows Host](https://docs.punktfunk.unom.io/docs/windows-host) · [packaging/winget](packaging/winget/README.md) |
+| **Windows** (11 22H2+, x64) | signed `setup.exe` from the package registry | [Windows Host](https://docs.punktfunk.unom.io/docs/windows-host) |

 `punktfunk-host` is the streaming host; `punktfunk-web` is the browser console (pairing + status).
 After install, run `punktfunk-host serve` inside your desktop session (the secure native default;
@@ -1,45 +0,0 @@
-#!/bin/bash
-# Host-side C compiler wrapper for the aarch64 cross image (ci/rust-ci-arm64cross.Dockerfile).
-#
-# Why this exists: ffmpeg-sys-next's build script compiles a probe it intends to RUN — it
-# executes the binary to read the libav* version macros — so it forces `.target(HOST)` with
-# the comment "don't cross-compile this", but still hands that host compile the TARGET's
-# pkg-config include paths. `-I/usr/include/aarch64-linux-gnu` then shadows the host's own
-# multiarch libc headers and the x86 compiler dies inside bits/math-vector.h on NEON/SVE
-# types it has never heard of.
-#
-# Prepending the host's multiarch dir does NOT fix it: GCC drops a `-I` that duplicates a
-# directory already on its system include path (keeping it in the original, later position),
-# so the arm64 dir stays in front. The reliable fix is to remove the target include dirs from
-# the host compile entirely — the probe only wants FFmpeg's version macros, and the amd64
-# libav*-dev headers are installed and on the default search path, at the same version (both
-# come from this Ubuntu release).
-#
-# Scope: only ever invoked as CC for the HOST triple (CC_x86_64_unknown_linux_gnu). Target
-# compiles go to aarch64-linux-gnu-gcc and never pass through here.
-set -euo pipefail
-
-declare -a out=()
-while (($#)); do
-  case "$1" in
-  # `-I dir` as two arguments — the form cc's Command building and ffmpeg-sys both emit.
-  -I)
-    if [[ ${2-} == *aarch64-linux-gnu* ]]; then
-      shift 2
-      continue
-    fi
-    out+=("$1" "${2-}")
-    shift 2
-    ;;
-  # `-Idir` glued into one argument.
-  -I*aarch64-linux-gnu*)
-    shift
-    ;;
-  *)
-    out+=("$1")
-    shift
-    ;;
-  esac
-done
-
-exec /usr/bin/cc "${out[@]}"
@@ -1,81 +0,0 @@
-# Cross-compiling CI builder: amd64 host toolchain + an arm64 multiarch sysroot, for the
-# aarch64 Linux CLIENT artifacts (punktfunk-client + punktfunk-session).
-#
-#   docker build -f ci/rust-ci-arm64cross.Dockerfile -t punktfunk-rust-ci-arm64cross .
-#
-# Derived from punktfunk-rust-ci so the Rust toolchain, clang, and CMake are byte-identical
-# to the amd64 legs — this image only adds the target side. Kept as a SEPARATE image rather
-# than folded into the base because the :arm64 dev libs are ~1 GB that every other CI job
-# would otherwise pull for nothing.
-#
-# Client only: the Linux HOST stays amd64 (its encode stack is NVENC/QSV/AMF), so none of the
-# host's CUDA/GBM link deps are mirrored here.
-#
-# Ubuntu splits archives by architecture: amd64 lives on archive.ubuntu.com, every port
-# (arm64 included) on ports.ubuntu.com. Both stanzas therefore have to be pinned with an
-# explicit `Architectures:` or apt tries to fetch arm64 from the amd64 mirror and 404s.
-#
-# Built from the REPO ROOT context (not ci/) — see the rust-toolchain.toml copy below.
-FROM git.unom.io/unom/punktfunk-rust-ci:latest
-
-ENV DEBIAN_FRONTEND=noninteractive
-
-# 1. Pin the stock sources to amd64, add ports.ubuntu.com for arm64.
-RUN sed -i 's|^Types: deb$|Types: deb\nArchitectures: amd64|' /etc/apt/sources.list.d/ubuntu.sources \
-    && . /etc/os-release \
-    && printf 'Types: deb\nArchitectures: arm64\nURIs: http://ports.ubuntu.com/ubuntu-ports/\nSuites: %s %s-updates %s-backports %s-security\nComponents: main universe restricted multiverse\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n' \
-        "$VERSION_CODENAME" "$VERSION_CODENAME" "$VERSION_CODENAME" "$VERSION_CODENAME" \
-        > /etc/apt/sources.list.d/ubuntu-ports-arm64.sources \
-    && dpkg --add-architecture arm64
-
-# 2. The cross toolchain + every arm64 dev lib the client links. Mirrors the client half of
-#    rust-ci.Dockerfile's list (FFmpeg, PipeWire, Opus, SDL3, GTK4/libadwaita, xkbcommon,
-#    Vulkan headers for pf-ffvk's bindgen over hwcontext_vulkan.h).
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    crossbuild-essential-arm64 \
-    libavcodec-dev:arm64 libavformat-dev:arm64 libavutil-dev:arm64 libswscale-dev:arm64 \
-    libavfilter-dev:arm64 libavdevice-dev:arm64 \
-    libpipewire-0.3-dev:arm64 libopus-dev:arm64 \
-    libsdl3-dev:arm64 libgtk-4-dev:arm64 libadwaita-1-dev:arm64 \
-    libwayland-dev:arm64 libxkbcommon-dev:arm64 libvulkan-dev:arm64 \
-    && rm -rf /var/lib/apt/lists/*
-
-# 3. The Rust target — installed against the toolchain the WORKSPACE pins, not the image's
-#    default. The base image bakes whatever `stable` was at its build time, while every build
-#    in the repo switches to the exact channel in rust-toolchain.toml; adding the target to
-#    the default toolchain instead leaves the pinned one without an aarch64 std, and the build
-#    dies on `can't find crate for core` a few hundred crates in. Running rustup from a
-#    directory that contains the pin file resolves the right toolchain (and pre-downloads it,
-#    which every workspace job would otherwise pay for on first use).
-COPY rust-toolchain.toml /opt/pf-toolchain/
-WORKDIR /opt/pf-toolchain
-RUN rustup target add aarch64-unknown-linux-gnu && rustup show
-WORKDIR /
-
-# 4. Cross wiring. Everything in this image is a cross build, so the plain (un-suffixed)
-#    variables are safe and cover the crates that roll their own pkg-config/bindgen calls
-#    instead of going through the target-scoped lookups.
-#      * PKG_CONFIG uses Debian's multiarch wrapper, which resolves the arm64 .pc files and
-#        rewrites -I/-L into the sysroot without per-crate cooperation.
-#      * BINDGEN_EXTRA_CLANG_ARGS: clang defaults to the host triple, so bindgen would parse
-#        arm64 headers with amd64 type layouts (silently wrong, not a build error) — the
-#        explicit --target plus the multiarch include dir is what keeps the layouts honest.
-#      * CC_x86_64_unknown_linux_gnu routes HOST-targeted compiles through a wrapper that
-#        strips the arm64 include dirs — see ci/pf-host-cc for the ffmpeg-sys-next probe it
-#        exists for.
-COPY ci/pf-host-cc /usr/local/bin/pf-host-cc
-RUN chmod 0755 /usr/local/bin/pf-host-cc
-
-ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc \
-    CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc \
-    CXX_aarch64_unknown_linux_gnu=aarch64-linux-gnu-g++ \
-    AR_aarch64_unknown_linux_gnu=aarch64-linux-gnu-ar \
-    CC_x86_64_unknown_linux_gnu=/usr/local/bin/pf-host-cc \
-    PKG_CONFIG=aarch64-linux-gnu-pkg-config \
-    PKG_CONFIG_ALLOW_CROSS=1 \
-    BINDGEN_EXTRA_CLANG_ARGS="--target=aarch64-unknown-linux-gnu -I/usr/include/aarch64-linux-gnu"
-
-# Fail the BUILD, not some later CI job, if the wrapper or a sysroot .pc is missing.
-RUN command -v aarch64-linux-gnu-pkg-config \
-    && aarch64-linux-gnu-pkg-config --cflags libavcodec sdl3 gtk4 libpipewire-0.3 \
-    && aarch64-linux-gnu-gcc -dumpmachine | grep -q aarch64
@@ -1,107 +0,0 @@
-package io.unom.punktfunk
-
-import android.content.ClipData
-import android.content.ClipboardManager
-import android.content.Context
-import android.os.Handler
-import android.os.Looper
-import io.unom.punktfunk.kit.NativeBridge
-
-/**
- * Text clipboard sync for the active session (the desktop-client model, text-only v1):
- *  * **Device → host**: a local copy (the primary-clip listener, plus one probe at start) is
- *    announced as a lazy offer — the text crosses only when the host actually pastes (a
- *    `fetch:` event, answered with the clipboard's current content).
- *  * **Host → device**: a host copy arrives as an `offer:` event and is fetched eagerly into
- *    the system clipboard (Android apps can't lazily materialize a paste from the network
- *    without a content-provider round-trip that isn't worth it here).
- *
- * Loop guard: text set from a host fetch is remembered ([lastFromHost]) so the resulting
- * primary-clip-changed callback doesn't bounce it straight back as a new offer. Clipboard reads
- * happen while the stream is foreground (Android only allows focused-app reads). The native
- * events are drained on a dedicated thread and applied on the main thread; [stop] joins it.
- */
-class ClipboardSync(
-    private val context: Context,
-    private val handle: Long,
-) {
-    private val main = Handler(Looper.getMainLooper())
-    private val cm = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
-
-    @Volatile private var running = true
-    private var seq = 0
-    private var lastOffered: String? = null
-    private var lastFromHost: String? = null
-    private var pendingFetch = -1
-    private var thread: Thread? = null
-
-    private val clipListener = ClipboardManager.OnPrimaryClipChangedListener { offerLocal() }
-
-    fun start() {
-        NativeBridge.nativeClipControl(handle, true)
-        cm.addPrimaryClipChangedListener(clipListener)
-        thread = Thread({ pollLoop() }, "pf-clipboard").also { it.start() }
-        offerLocal() // whatever is already on the clipboard is pasteable host-side right away
-    }
-
-    fun stop() {
-        running = false
-        cm.removePrimaryClipChangedListener(clipListener)
-        thread?.join(600) // one poll timeout (250 ms) + slack
-        thread = null
-    }
-
-    /** Announce the current local text (if it's new and not an echo of a host copy). */
-    private fun offerLocal() {
-        if (!running) return
-        val text = currentClipText() ?: return
-        if (text == lastOffered || text == lastFromHost) return
-        lastOffered = text
-        seq += 1
-        NativeBridge.nativeClipOfferText(handle, seq)
-    }
-
-    private fun currentClipText(): String? = runCatching {
-        cm.primaryClip?.takeIf { it.itemCount > 0 }?.getItemAt(0)
-            ?.coerceToText(context)?.toString()?.takeIf { it.isNotEmpty() }
-    }.getOrNull()
-
-    private fun pollLoop() {
-        while (running) {
-            val ev = NativeBridge.nativeNextClip(handle) ?: continue
-            if (ev == "closed") return
-            main.post { handleEvent(ev) }
-        }
-    }
-
-    private fun handleEvent(ev: String) {
-        if (!running) return
-        val parts = ev.split(":", limit = 3)
-        when (parts[0]) {
-            "offer" -> {
-                val offerSeq = parts.getOrNull(1)?.toIntOrNull() ?: return
-                if (parts.getOrNull(2) == "1") {
-                    pendingFetch = NativeBridge.nativeClipFetchText(handle, offerSeq)
-                }
-            }
-            "fetch" -> {
-                val req = parts.getOrNull(1)?.toIntOrNull() ?: return
-                val text = currentClipText()
-                if (text != null) {
-                    NativeBridge.nativeClipServeText(handle, req, text)
-                } else {
-                    NativeBridge.nativeClipCancel(handle, req)
-                }
-            }
-            "data" -> {
-                val xfer = parts.getOrNull(1)?.toIntOrNull() ?: return
-                if (xfer != pendingFetch) return // stale/unknown transfer
-                pendingFetch = -1
-                val text = parts.getOrNull(2)?.takeIf { it.isNotEmpty() } ?: return
-                lastFromHost = text
-                runCatching { cm.setPrimaryClip(ClipData.newPlainText("Punktfunk", text)) }
-            }
-            // "state"/"cancel"/"error": nothing to drive in the text-only v1.
-        }
-    }
-}
@@ -54,21 +54,6 @@ class MainActivity : ComponentActivity() {
    var padKeyProbe: ((KeyEvent) -> Boolean)? = null
    var padMotionProbe: ((MotionEvent) -> Boolean)? = null

-    /**
-     * Physical-mouse forwarder for the active session (built/released by StreamScreen, like
-     * [gamepadRouter]): uncaptured hover/click/wheel forwards as absolute cursor input, captured
-     * ([android.view.View.requestPointerCapture]) raw deltas as relative mouse-look. The dispatch
-     * overrides below route every SOURCE_MOUSE event here while streaming. Null while not streaming.
-     */
-    var mouseForwarder: MouseForwarder? = null
-
-    /**
-     * TV remote-as-pointer for the active session (StreamScreen builds it on TV devices only):
-     * hold SELECT to toggle, then the D-pad glides the host cursor. Consulted first for
-     * non-gamepad keys while streaming. Null while not streaming or not a TV.
-     */
-    var remotePointer: RemotePointer? = null
-
    /**
     * Set by [StreamScreen] to its disconnect action. The emergency-exit chord (below) invokes it so a
     * couch user with no keyboard/Back can always leave a stream.
@@ -339,37 +324,9 @@ class MainActivity : ComponentActivity() {
                    return true // consumed
                }
            }
-            // TV remote-as-pointer sees non-gamepad keys first (SELECT long-press toggles it;
-            // while active it owns the D-pad/SELECT/PLAY-PAUSE/BACK).
-            if (!event.isFromSource(InputDevice.SOURCE_GAMEPAD)) {
-                remotePointer?.let { if (it.onKey(event)) return true }
-            }
-            // Ctrl+Alt+Shift+Q — the cross-client pointer-capture toggle chord. Swallow both
-            // edges of the Q (the modifiers already went over the wire, exactly like desktop).
-            if (event.keyCode == KeyEvent.KEYCODE_Q &&
-                event.isCtrlPressed && event.isAltPressed && event.isShiftPressed
-            ) {
-                if (event.action == KeyEvent.ACTION_DOWN && event.repeatCount == 0) {
-                    mouseForwarder?.toggleCapture()
-                }
-                return true
-            }
            when (event.keyCode) {
-                // A mouse's back/forward buttons already go over the wire as X1/X2 via their
-                // BUTTON_* motion edges — but Android ALSO delivers them as key events: the input
-                // reader synthesizes KEYCODE_BACK/FORWARD (stamped SOURCE_MOUSE) unconditionally,
-                // and a view-level FALLBACK BACK appears when the BUTTON_* press goes unconsumed.
-                // Swallow every such duplicate or it doubles as Android navigation and yanks the
-                // user out of the stream. A remote/keyboard BACK is never mouse-sourced, so it
-                // still falls through to the BackHandler and exits.
-                KeyEvent.KEYCODE_BACK, KeyEvent.KEYCODE_FORWARD ->
-                    if (event.isFromSource(InputDevice.SOURCE_MOUSE) ||
-                        event.flags and KeyEvent.FLAG_FALLBACK != 0
-                    ) {
-                        return true
-                    }
                // Leave these to the system even while streaming.
-                // (BACK above → BackHandler leaves the stream.)
+                KeyEvent.KEYCODE_BACK, // → BackHandler leaves the stream
                KeyEvent.KEYCODE_VOLUME_UP,
                KeyEvent.KEYCODE_VOLUME_DOWN,
                KeyEvent.KEYCODE_VOLUME_MUTE,
@@ -437,10 +394,6 @@ class MainActivity : ComponentActivity() {
    override fun dispatchGenericMotionEvent(event: MotionEvent): Boolean {
        if (streamHandle != 0L) {
            if (gamepadRouter?.onMotion(event) == true) return true
-            // Physical mouse (uncaptured): hover motion, wheel, button edges.
-            if (event.isFromSource(InputDevice.SOURCE_MOUSE)) {
-                mouseForwarder?.let { if (it.onGenericMotion(event)) return true }
-            }
            return super.dispatchGenericMotionEvent(event)
        }
        // The Controllers debug screen sees pad motion before the stick→D-pad synthesis below.
@@ -478,24 +431,6 @@ class MainActivity : ComponentActivity() {
        return super.dispatchGenericMotionEvent(event)
    }

-    /**
-     * Mouse clicks/drags ride the TOUCH stream (the pointer is "down"). While streaming they
-     * belong to the mouse forwarder, never to the Compose touch-gesture layer — a physical
-     * mouse click must be a real click at the cursor, not a synthesized trackpad tap.
-     */
-    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
-        if (streamHandle != 0L && ev.isFromSource(InputDevice.SOURCE_MOUSE)) {
-            mouseForwarder?.let { if (it.onTouchEvent(ev)) return true }
-        }
-        return super.dispatchTouchEvent(ev)
-    }
-
-    /** The OS is the source of truth for pointer capture (it releases on focus loss). */
-    override fun onPointerCaptureChanged(hasCapture: Boolean) {
-        super.onPointerCaptureChanged(hasCapture)
-        mouseForwarder?.onCaptureChanged(hasCapture)
-    }
-
    /** Keys that drive the console UI — D-pad + face buttons; used to classify the last input source. */
    private fun isConsoleNavKey(kc: Int): Boolean = when (kc) {
        KeyEvent.KEYCODE_DPAD_UP, KeyEvent.KEYCODE_DPAD_DOWN, KeyEvent.KEYCODE_DPAD_LEFT,
@@ -1,206 +0,0 @@
-package io.unom.punktfunk
-
-import android.view.InputDevice
-import android.view.MotionEvent
-import io.unom.punktfunk.kit.NativeBridge
-import kotlin.math.roundToInt
-
-/** True when any connected input device is a pointer (USB/BT mouse, or a touchpad driving one). */
-fun hasPhysicalMouse(): Boolean = InputDevice.getDeviceIds().any { id ->
-    InputDevice.getDevice(id)?.supportsSource(InputDevice.SOURCE_MOUSE) == true
-}
-
-/**
- * Physical mouse → wire, in two modes (the iPadOS/desktop model):
- *  * **uncaptured** (default): hover/drag positions forward as absolute cursor moves
- *    (`MouseMoveAbs`, host-normalized against the window size) — desktop-style pointing. The
- *    local cursor is hidden over the stream (StreamScreen sets a TYPE_NULL pointer icon); the
- *    host's own cursor, composited into the video, is the one you see.
- *  * **captured**: the OS pointer is grabbed ([android.view.View.requestPointerCapture]) and raw
- *    relative deltas forward as `MouseMove` — FPS mouse-look. Engaged at stream start / by
- *    clicking into the stream when the "Capture pointer for games" setting is on, and toggled
- *    any time by Ctrl+Alt+Shift+Q (the cross-client chord). Focus loss releases it (the OS
- *    guarantees that); a click re-engages.
- *
- * Buttons ride [MotionEvent.ACTION_BUTTON_PRESS]/RELEASE edges (left/middle/right/back/forward →
- * wire 1/2/3/4/5), the wheel rides [MotionEvent.ACTION_SCROLL] with fractional accumulation so
- * high-resolution wheels don't lose sub-notch travel. Held buttons are tracked and flushed on
- * capture loss / stream exit so nothing sticks on the host. Events reach this class from
- * MainActivity's dispatch overrides (uncaptured) and the capture view's captured-pointer listener.
- */
-class MouseForwarder(
-    private val handle: Long,
-    private val invertScroll: Boolean,
-    private val captureWanted: Boolean,
-    private val surfaceSize: () -> Pair<Int, Int>,
-) {
-    /** Capture plumbing, owned by StreamScreen (the focusable capture view). */
-    var onRequestCapture: (() -> Unit)? = null
-    var onReleaseCapture: (() -> Unit)? = null
-
-    /** Live capture state, updated from [android.app.Activity.onPointerCaptureChanged]. */
-    var captured = false
-        private set
-
-    /** Chord-released: no auto re-engage (start / click) until the user opts back in. */
-    private var userReleased = false
-
-    private val heldButtons = mutableSetOf<Int>()
-    private var scrollAccV = 0f
-    private var scrollAccH = 0f
-    private var moveAccX = 0f
-    private var moveAccY = 0f
-
-    /** Uncaptured mouse events on the TOUCH stream (position while a button is down). */
-    fun onTouchEvent(ev: MotionEvent): Boolean {
-        when (ev.actionMasked) {
-            MotionEvent.ACTION_DOWN -> {
-                if (captureWanted && !captured && !userReleased) {
-                    // The engaging click: grab the pointer and swallow the click (desktop
-                    // parity — the click that captures never reaches the host). The paired
-                    // BUTTON_RELEASE is dropped by the held-set guard in [button].
-                    onRequestCapture?.invoke()
-                    return true
-                }
-                sendAbs(ev)
-            }
-            MotionEvent.ACTION_MOVE -> sendAbs(ev)
-            // Button edges are documented on the generic stream, but be robust to either.
-            MotionEvent.ACTION_BUTTON_PRESS -> button(ev.actionButton, true)
-            MotionEvent.ACTION_BUTTON_RELEASE -> button(ev.actionButton, false)
-        }
-        return true
-    }
-
-    /** Uncaptured mouse events on the GENERIC stream (hover motion, wheel, button edges). */
-    fun onGenericMotion(ev: MotionEvent): Boolean {
-        when (ev.actionMasked) {
-            MotionEvent.ACTION_HOVER_MOVE -> sendAbs(ev)
-            MotionEvent.ACTION_SCROLL -> wheel(ev)
-            MotionEvent.ACTION_BUTTON_PRESS -> button(ev.actionButton, true)
-            MotionEvent.ACTION_BUTTON_RELEASE -> button(ev.actionButton, false)
-            MotionEvent.ACTION_HOVER_ENTER, MotionEvent.ACTION_HOVER_EXIT -> {}
-            else -> return false
-        }
-        return true
-    }
-
-    /**
-     * Captured-pointer events (the view holds [android.view.View.requestPointerCapture]): x/y ARE
-     * the relative deltas ([InputDevice.SOURCE_MOUSE_RELATIVE]), batched samples included. A
-     * captured touchpad reports absolute finger coordinates instead — not handled (the touch
-     * gesture layer is the touchpad story); returning false leaves those to the framework.
-     */
-    fun onCapturedPointer(ev: MotionEvent): Boolean {
-        if (!ev.isFromSource(InputDevice.SOURCE_MOUSE_RELATIVE)) return false
-        when (ev.actionMasked) {
-            MotionEvent.ACTION_MOVE -> {
-                var dx = 0f
-                var dy = 0f
-                for (i in 0 until ev.historySize) {
-                    dx += ev.getHistoricalX(i)
-                    dy += ev.getHistoricalY(i)
-                }
-                dx += ev.x
-                dy += ev.y
-                moveAccX += dx
-                moveAccY += dy
-                val ox = moveAccX.toInt() // truncate toward zero — sub-pixel remainder kept w/ sign
-                val oy = moveAccY.toInt()
-                if (ox != 0 || oy != 0) {
-                    NativeBridge.nativeSendPointerMove(handle, ox, oy)
-                    moveAccX -= ox
-                    moveAccY -= oy
-                }
-            }
-            MotionEvent.ACTION_BUTTON_PRESS -> button(ev.actionButton, true)
-            MotionEvent.ACTION_BUTTON_RELEASE -> button(ev.actionButton, false)
-            MotionEvent.ACTION_SCROLL -> wheel(ev)
-        }
-        return true
-    }
-
-    /** Ctrl+Alt+Shift+Q: release the grab, or (re-)engage it — works even when auto-capture is off. */
-    fun toggleCapture() {
-        if (captured) {
-            userReleased = true
-            onReleaseCapture?.invoke()
-        } else {
-            userReleased = false
-            onRequestCapture?.invoke()
-        }
-    }
-
-    /** Auto-engage at stream start (setting on + a mouse actually present). */
-    fun engageFromStart() {
-        if (captureWanted && !captured && !userReleased && hasPhysicalMouse()) {
-            onRequestCapture?.invoke()
-        }
-    }
-
-    /** From [android.app.Activity.onPointerCaptureChanged] — the OS is the source of truth. */
-    fun onCaptureChanged(has: Boolean) {
-        captured = has
-        // Losing the grab (focus loss, chord) must not leave buttons held on the host.
-        if (!has) flushButtons()
-    }
-
-    /** Stream teardown: lift anything held and let the grab go. */
-    fun release() {
-        flushButtons()
-        if (captured) onReleaseCapture?.invoke()
-    }
-
-    private fun sendAbs(ev: MotionEvent) {
-        val (w, h) = surfaceSize()
-        if (w <= 0 || h <= 0) return
-        NativeBridge.nativeSendPointerAbs(
-            handle,
-            ev.x.roundToInt().coerceIn(0, w - 1),
-            ev.y.roundToInt().coerceIn(0, h - 1),
-            w,
-            h,
-        )
-    }
-
-    private fun wheel(ev: MotionEvent) {
-        val dir = if (invertScroll) -1f else 1f
-        // Android: AXIS_VSCROLL + = up/away, AXIS_HSCROLL + = right — the wire's convention too.
-        scrollAccV += ev.getAxisValue(MotionEvent.AXIS_VSCROLL) * 120f * dir
-        scrollAccH += ev.getAxisValue(MotionEvent.AXIS_HSCROLL) * 120f * dir
-        val v = scrollAccV.toInt()
-        if (v != 0) {
-            NativeBridge.nativeSendScroll(handle, 0, v)
-            scrollAccV -= v
-        }
-        val h = scrollAccH.toInt()
-        if (h != 0) {
-            NativeBridge.nativeSendScroll(handle, 1, h)
-            scrollAccH -= h
-        }
-    }
-
-    private fun button(actionButton: Int, down: Boolean) {
-        val b = when (actionButton) {
-            MotionEvent.BUTTON_PRIMARY -> 1
-            MotionEvent.BUTTON_TERTIARY -> 2
-            MotionEvent.BUTTON_SECONDARY -> 3
-            MotionEvent.BUTTON_BACK -> 4
-            MotionEvent.BUTTON_FORWARD -> 5
-            else -> return
-        }
-        if (down) {
-            heldButtons.add(b)
-            NativeBridge.nativeSendPointerButton(handle, b, true)
-        } else if (heldButtons.remove(b)) {
-            // Only release what we pressed — drops the release of a swallowed engaging click
-            // and anything that raced a capture transition.
-            NativeBridge.nativeSendPointerButton(handle, b, false)
-        }
-    }
-
-    private fun flushButtons() {
-        heldButtons.forEach { NativeBridge.nativeSendPointerButton(handle, it, false) }
-        heldButtons.clear()
-    }
-}
@@ -1,193 +0,0 @@
-package io.unom.punktfunk
-
-import android.os.Handler
-import android.os.Looper
-import android.view.Choreographer
-import android.view.KeyEvent
-import io.unom.punktfunk.kit.NativeBridge
-import kotlin.math.hypot
-
-// Hold this long on SELECT (pointer-mode toggle) / PLAY-PAUSE (keyboard toggle) for the long-press
-// action instead of the tap action.
-private const val LONG_PRESS_MS = 800L
-
-// D-pad glide ballistics, in screen-widths per second: start slow enough to hit a close button,
-// ramp over RAMP_S seconds of continuous hold so crossing the desktop doesn't take all day.
-private const val SPEED_MIN = 0.14f
-private const val SPEED_MAX = 0.70f
-private const val RAMP_S = 1.2f
-
-/**
- * Android TV remote as a pointer — the Android analogue of the Apple client's Siri-remote pointer,
- * adapted for D-pad-only remotes (most Android TV remotes have no touch surface). For the
- * "TV as a desktop client" use case, where a plain remote is often the only thing in hand.
- *
- * While streaming on a TV, **hold SELECT ≈ 0.8 s** to toggle pointer mode. While active:
- *  * D-pad (held) glides the host cursor with ramping acceleration (relative `MouseMove`,
- *    Choreographer-paced, diagonal-normalized);
- *  * SELECT tap = left click; PLAY/PAUSE tap = right click (Siri-remote parity);
- *  * PLAY/PAUSE held = toggle the on-screen keyboard; BACK = leave pointer mode
- *    (a second BACK then leaves the stream as usual).
- * While inactive, everything except the SELECT long-press passes through untouched (D-pad =
- * arrow keys, SELECT tap = Enter — synthesized on release, since the down was held back to
- * disambiguate the long-press).
- *
- * Only consulted for non-gamepad key events on TV devices (MainActivity gates the calls); all
- * state lives on the main thread.
- */
-class RemotePointer(
-    private val handle: Long,
-    private val surfaceWidth: () -> Int,
-    private val onActiveChanged: (Boolean) -> Unit,
-    private val onKeyboardToggle: () -> Unit,
-) {
-    var active = false
-        private set
-
-    private val handler = Handler(Looper.getMainLooper())
-    private val held = mutableSetOf<Int>() // D-pad keycodes currently down
-    private var moveAccX = 0f
-    private var moveAccY = 0f
-    private var lastFrameNs = 0L
-    private var rampSec = 0f
-    private var tickerRunning = false
-    private var centerLongFired = false
-    private var playLongFired = false
-
-    private val centerLong = Runnable {
-        centerLongFired = true
-        toggle()
-    }
-    private val playLong = Runnable {
-        playLongFired = true
-        onKeyboardToggle()
-    }
-
-    private val frame = object : Choreographer.FrameCallback {
-        override fun doFrame(nowNs: Long) {
-            if (!tickerRunning) return
-            if (held.isEmpty() || !active) {
-                tickerRunning = false
-                return
-            }
-            val dt = if (lastFrameNs == 0L) {
-                1f / 60f
-            } else {
-                ((nowNs - lastFrameNs) / 1e9f).coerceIn(0.001f, 0.1f)
-            }
-            lastFrameNs = nowNs
-            rampSec += dt
-            var vx = 0f
-            var vy = 0f
-            if (KeyEvent.KEYCODE_DPAD_LEFT in held) vx -= 1f
-            if (KeyEvent.KEYCODE_DPAD_RIGHT in held) vx += 1f
-            if (KeyEvent.KEYCODE_DPAD_UP in held) vy -= 1f
-            if (KeyEvent.KEYCODE_DPAD_DOWN in held) vy += 1f
-            val mag = hypot(vx, vy)
-            if (mag > 0f) {
-                val w = surfaceWidth().coerceAtLeast(640)
-                val speed = w * (SPEED_MIN + (SPEED_MAX - SPEED_MIN) * (rampSec / RAMP_S).coerceAtMost(1f))
-                moveAccX += vx / mag * speed * dt
-                moveAccY += vy / mag * speed * dt
-                val ox = moveAccX.toInt() // truncate toward zero — sub-pixel remainder kept
-                val oy = moveAccY.toInt()
-                if (ox != 0 || oy != 0) {
-                    NativeBridge.nativeSendPointerMove(handle, ox, oy)
-                    moveAccX -= ox
-                    moveAccY -= oy
-                }
-            }
-            Choreographer.getInstance().postFrameCallback(this)
-        }
-    }
-
-    /** One remote key event; true = consumed. Ignore key repeats — the ticker owns motion. */
-    fun onKey(event: KeyEvent): Boolean {
-        val down = event.action == KeyEvent.ACTION_DOWN
-        when (event.keyCode) {
-            KeyEvent.KEYCODE_DPAD_CENTER -> {
-                if (down) {
-                    if (event.repeatCount == 0) {
-                        centerLongFired = false
-                        handler.postDelayed(centerLong, LONG_PRESS_MS)
-                    }
-                } else {
-                    handler.removeCallbacks(centerLong)
-                    if (!centerLongFired) {
-                        if (active) {
-                            click(1)
-                        } else {
-                            // The down was held back to disambiguate the long-press, so the
-                            // normal path never saw it — synthesize the Enter here instead.
-                            NativeBridge.nativeSendKey(handle, 0x0D, true, 0)
-                            NativeBridge.nativeSendKey(handle, 0x0D, false, 0)
-                        }
-                    }
-                }
-                return true
-            }
-            KeyEvent.KEYCODE_DPAD_UP, KeyEvent.KEYCODE_DPAD_DOWN,
-            KeyEvent.KEYCODE_DPAD_LEFT, KeyEvent.KEYCODE_DPAD_RIGHT,
-            -> {
-                if (!active) return false
-                if (down) {
-                    if (held.add(event.keyCode) && held.size == 1) startTicker()
-                } else {
-                    held.remove(event.keyCode)
-                }
-                return true
-            }
-            KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE -> {
-                if (!active) return false // inactive: the media-key VK path owns it
-                if (down) {
-                    if (event.repeatCount == 0) {
-                        playLongFired = false
-                        handler.postDelayed(playLong, LONG_PRESS_MS)
-                    }
-                } else {
-                    handler.removeCallbacks(playLong)
-                    if (!playLongFired) click(3)
-                }
-                return true
-            }
-            KeyEvent.KEYCODE_BACK -> {
-                if (!active) return false
-                if (!down) toggle() // leave pointer mode; the next BACK leaves the stream
-                return true
-            }
-            else -> return false
-        }
-    }
-
-    /** Stream teardown: stop timers/ticker; nothing wire-held to flush (clicks are edges). */
-    fun release() {
-        handler.removeCallbacks(centerLong)
-        handler.removeCallbacks(playLong)
-        active = false
-        held.clear()
-        tickerRunning = false
-    }
-
-    private fun toggle() {
-        active = !active
-        if (!active) {
-            held.clear()
-            tickerRunning = false
-        }
-        onActiveChanged(active)
-    }
-
-    private fun startTicker() {
-        rampSec = 0f
-        lastFrameNs = 0L
-        if (!tickerRunning) {
-            tickerRunning = true
-            Choreographer.getInstance().postFrameCallback(frame)
-        }
-    }
-
-    private fun click(button: Int) {
-        NativeBridge.nativeSendPointerButton(handle, button, true)
-        NativeBridge.nativeSendPointerButton(handle, button, false)
-    }
-}
@@ -109,27 +109,6 @@ data class Settings(
     * setup where the OS-level pad (lizard mode) is preferred.
     */
    val sc2Capture: Boolean = true,
-
-    /**
-     * Lock a physical mouse to the stream ([android.view.View.requestPointerCapture]) and forward
-     * raw relative motion — FPS mouse-look, the iPad "Capture pointer for games" twin. Engages at
-     * stream start and on a click into the stream; Ctrl+Alt+Shift+Q toggles it live (the chord
-     * works even with this off). Off (default): a mouse points absolutely, desktop-style.
-     */
-    val pointerCapture: Boolean = false,
-
-    /**
-     * Flip scroll direction — the mouse wheel and the two-finger touch scroll both. Parity with
-     * the Apple/GTK clients' "Invert scroll direction".
-     */
-    val invertScroll: Boolean = false,
-
-    /**
-     * Sync text copied on this device to the host and vice versa while streaming (the desktop
-     * clients' shared clipboard, text-only here). Only effective when the host advertises the
-     * clipboard capability; the protocol is opt-in per session either way.
-     */
-    val clipboardSync: Boolean = true,
 )

 /** [Settings.touchMode] values; persisted by name. */
@@ -193,9 +172,6 @@ class SettingsStore(context: Context) {
        autoWakeEnabled = prefs.getBoolean(K_AUTO_WAKE, true),
        rumbleOnPhone = prefs.getBoolean(K_RUMBLE_ON_PHONE, false),
        sc2Capture = prefs.getBoolean(K_SC2_CAPTURE, true),
-        pointerCapture = prefs.getBoolean(K_POINTER_CAPTURE, false),
-        invertScroll = prefs.getBoolean(K_INVERT_SCROLL, false),
-        clipboardSync = prefs.getBoolean(K_CLIPBOARD_SYNC, true),
    )

    fun save(s: Settings) {
@@ -219,9 +195,6 @@ class SettingsStore(context: Context) {
            .putBoolean(K_AUTO_WAKE, s.autoWakeEnabled)
            .putBoolean(K_RUMBLE_ON_PHONE, s.rumbleOnPhone)
            .putBoolean(K_SC2_CAPTURE, s.sc2Capture)
-            .putBoolean(K_POINTER_CAPTURE, s.pointerCapture)
-            .putBoolean(K_INVERT_SCROLL, s.invertScroll)
-            .putBoolean(K_CLIPBOARD_SYNC, s.clipboardSync)
            .apply()
    }

@@ -260,9 +233,6 @@ class SettingsStore(context: Context) {
        const val K_AUTO_WAKE = "auto_wake_enabled"
        const val K_RUMBLE_ON_PHONE = "rumble_on_phone"
        const val K_SC2_CAPTURE = "sc2_capture"
-        const val K_POINTER_CAPTURE = "pointer_capture"
-        const val K_INVERT_SCROLL = "invert_scroll"
-        const val K_CLIPBOARD_SYNC = "clipboard_sync"

        /** Legacy Boolean the enum replaced — read once as the migration default, never written. */
        const val K_TRACKPAD = "trackpad_mode"
@@ -412,27 +412,6 @@ private fun ControlsSettings(s: Settings, update: (Settings) -> Unit, onOpenCont
            style = MaterialTheme.typography.bodySmall,
            color = MaterialTheme.colorScheme.onSurfaceVariant,
        )
-        ToggleRow(
-            title = "Capture pointer for games",
-            subtitle = "Lock a connected mouse to the stream and send raw relative motion " +
-                "(mouse-look). Ctrl+Alt+Shift+Q toggles it live; click the stream to re-capture. " +
-                "Off: the mouse points at the desktop directly",
-            checked = s.pointerCapture,
-            onCheckedChange = { on -> update(s.copy(pointerCapture = on)) },
-        )
-        ToggleRow(
-            title = "Invert scroll direction",
-            subtitle = "Flip the mouse wheel and two-finger touch scrolling",
-            checked = s.invertScroll,
-            onCheckedChange = { on -> update(s.copy(invertScroll = on)) },
-        )
-        ToggleRow(
-            title = "Shared clipboard",
-            subtitle = "Text copied here pastes on the host and vice versa (hosts with " +
-                "clipboard sharing enabled)",
-            checked = s.clipboardSync,
-            onCheckedChange = { on -> update(s.copy(clipboardSync = on)) },
-        )
    }
    SettingsCard {
        SettingDropdown(
@@ -13,7 +13,6 @@ import android.net.wifi.WifiManager
 import android.os.Build
 import android.text.InputType
 import android.util.Log
-import android.view.KeyEvent
 import android.view.SurfaceHolder
 import android.view.SurfaceView
 import android.view.View
@@ -50,9 +49,6 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
-import androidx.lifecycle.Lifecycle
-import androidx.lifecycle.LifecycleEventObserver
-import androidx.lifecycle.LifecycleOwner
 import io.unom.punktfunk.kit.GamepadFeedback
 import io.unom.punktfunk.kit.GamepadRouter
 import io.unom.punktfunk.kit.deviceBodyVibrator
@@ -180,14 +176,6 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
    // "hold to quit" hint overlay. Set from the router's onExitArmed (main thread).
    var exitArming by remember { mutableStateOf(false) }

-    // True while the TV remote is acting as a pointer (hold SELECT toggles) — drives the mode hint.
-    var remotePointerOn by remember { mutableStateOf(false) }
-
-    // Focus anchor the soft keyboard is summoned onto AND the pointer-capture grab target (a grab
-    // needs a focusable view; captured-pointer events land on it). Declared before the effect
-    // below so the capture callbacks can reach the view once it exists.
-    var keyCapture by remember { mutableStateOf<KeyCaptureView?>(null) }
-
    DisposableEffect(handle) {
        window?.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
        wifiLocks.forEach { lock ->
@@ -233,54 +221,6 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
        // Show a "hold to quit" hint the moment the chord completes (the router debounces the actual
        // exit); it clears when the buttons release early or the hold elapses. Runs on the main thread.
        router.onExitArmed = { armed -> exitArming = armed }
-        // Physical mouse: uncaptured hover/click/wheel forwards as absolute pointing; captured
-        // (setting or the Ctrl+Alt+Shift+Q chord) raw deltas forward as relative mouse-look.
-        // The local cursor is hidden over the stream — the host's own cursor, composited into
-        // the video, is the one the user sees (twin of the desktop clients' hidden cursor).
-        val decor = window?.decorView
-        val priorPointerIcon = decor?.pointerIcon
-        decor?.pointerIcon = android.view.PointerIcon.getSystemIcon(
-            context,
-            android.view.PointerIcon.TYPE_NULL,
-        )
-        val mouse = MouseForwarder(
-            handle,
-            invertScroll = initialSettings.invertScroll,
-            captureWanted = initialSettings.pointerCapture,
-            surfaceSize = { (decor?.width ?: 0) to (decor?.height ?: 0) },
-        )
-        mouse.onRequestCapture = {
-            // The grab needs the (focusable) capture view: focus it, then ask. Posted so a
-            // request racing view attach/focus settles on the next frame.
-            keyCapture?.let { v ->
-                v.post {
-                    v.requestFocus()
-                    v.requestPointerCapture()
-                }
-            }
-        }
-        mouse.onReleaseCapture = { keyCapture?.releasePointerCapture() }
-        activity?.mouseForwarder = mouse
-        // TV remote-as-pointer: hold SELECT ≈ 0.8 s to toggle; the D-pad then glides the host
-        // cursor (see RemotePointer). TV only — a phone's remote-less keys stay on the VK path.
-        val remote = if (isTv) {
-            RemotePointer(
-                handle,
-                surfaceWidth = { decor?.width ?: 1920 },
-                onActiveChanged = { on -> remotePointerOn = on },
-                onKeyboardToggle = { keyCapture?.let { it.setImeVisible(!it.imeShown) } },
-            )
-        } else {
-            null
-        }
-        activity?.remotePointer = remote
-        // Shared clipboard (text v1): only when the user setting is on AND the host has a
-        // working clipboard service. Protocol-level opt-in + the poll thread live in the sync.
-        val clip = if (initialSettings.clipboardSync && NativeBridge.nativeClipSupported(handle)) {
-            ClipboardSync(context, handle).also { it.start() }
-        } else {
-            null
-        }
        activity?.setConsoleHighRefreshRate(false) // let the decoder's setFrameRate pick the panel rate
        // Host→client feedback (rumble + DualSense lightbar/LEDs), routed to each controller by pad
        // index via the router; poll threads stopped + joined before the router is released and the
@@ -346,7 +286,6 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
        }
        onDispose {
            closed.set(true) // from here the handle gets freed; surfaceDestroyed must not touch it
-            clip?.stop() // stop + join the clipboard poll thread BEFORE the handle is freed
            feedback.onHidRaw = null
            feedback.stop() // stop + join the poll threads BEFORE the router is released / handle freed
            sc2UsbReceiver?.let { runCatching { context.unregisterReceiver(it) } }
@@ -354,12 +293,6 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
            router.onExitArmed = null // don't poke Compose state from release()'s disarm while tearing down
            router.release() // flush every slot (nothing sticks host-side) + drop the hot-plug listener
            activity?.gamepadRouter = null
-            // Mouse/remote-pointer teardown: lift held buttons, drop the grab, restore the cursor.
-            mouse.release()
-            activity?.mouseForwarder = null
-            remote?.release()
-            activity?.remotePointer = null
-            decor?.pointerIcon = priorPointerIcon
            activity?.streamHandle = 0L
            activity?.requestStreamExit = null
            // Back in the menus: the SC2 (if present) resumes driving the console UI.
@@ -387,32 +320,8 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
    // Back gesture = a deliberate exit → signal the quit so the host tears down now (no linger).
    BackHandler { NativeBridge.nativeDisconnectQuit(handle); onDisconnect() }

-    // Leaving the app (Home, task switch, screen off) MUST end the session. Android does not
-    // suspend a process for going to background, so without this the native worker kept running and
-    // its QUIC connection kept answering the host's keep-alives — the user was long gone but the
-    // host still saw a live client and held the session (and its display + encoder) open until the
-    // OS eventually reclaimed the process, which on a TV box is effectively never.
-    //
-    // Route it through `onDisconnect()` so the composable's `onDispose` above runs the one real
-    // teardown path. Deliberately NOT a `nativeDisconnectQuit`: backgrounding isn't a user "quit",
-    // so the host should linger the display and make coming straight back a fast reconnect.
-    DisposableEffect(handle) {
-        val lifecycle = (context as? LifecycleOwner)?.lifecycle
-        val obs = LifecycleEventObserver { _, event ->
-            if (event == Lifecycle.Event.ON_STOP) {
-                onDisconnect()
-            }
-        }
-        lifecycle?.addObserver(obs)
-        onDispose { lifecycle?.removeObserver(obs) }
-    }
-
-    // Auto-engage pointer capture at stream start (setting on + a mouse actually present).
-    // Delayed a beat: the grab needs window focus and the capture view attached.
-    LaunchedEffect(handle) {
-        delay(400)
-        activity?.mouseForwarder?.engageFromStart()
-    }
+    // Focus anchor the three-finger keyboard swipe summons the IME onto (see KeyCaptureView).
+    var keyCapture by remember { mutableStateOf<KeyCaptureView?>(null) }

    Box(modifier = Modifier.fillMaxSize()) {
        AndroidView(
@@ -470,49 +379,23 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
        if (exitArming) {
            ExitChordHint(Modifier.align(Alignment.TopCenter).padding(top = 16.dp))
        }
-        // Remote-pointer mode hint — the remote's keys are remapped while it's on, so say so.
-        if (remotePointerOn) {
-            RemotePointerHint(Modifier.align(Alignment.TopCenter).padding(top = 16.dp))
-        }
-        // Invisible 1-px focus anchor for the host-typing soft keyboard (three-finger swipe up
-        // in the mouse modes) AND the pointer-capture grab target — it never draws or takes
-        // touches, it just owns IME focus and receives captured-pointer events.
+        // Invisible 1-px focus anchor for the host-typing soft keyboard (three-finger swipe
+        // up in the mouse modes) — it never draws or takes touches, it just owns IME focus.
        AndroidView(
            modifier = Modifier.size(1.dp),
-            factory = { ctx ->
-                KeyCaptureView(ctx).also { v ->
-                    keyCapture = v
-                    // Real IME text path when the host types committed text (see KeyCaptureView).
-                    v.textHandle =
-                        if (NativeBridge.nativeTextInputSupported(handle)) handle else 0L
-                    v.setOnCapturedPointerListener { _, ev ->
-                        (ctx as? MainActivity)?.mouseForwarder?.onCapturedPointer(ev) ?: false
-                    }
-                }
-            },
+            factory = { ctx -> KeyCaptureView(ctx).also { keyCapture = it } },
        )
        // Touch input per the Settings model: trackpad/direct-pointer mouse (the shared gesture
        // vocabulary) or real multi-touch passthrough — see TouchInput.kt. Passthrough gets no
        // keyboard gesture: its fingers belong to the host verbatim (a swipe there may BE a
        // host-OS gesture), so intercepting three fingers would corrupt real multi-touch.
-        // Stylus lane (design/pen-tablet-input.md §7): against a HOST_CAP_PEN host a stylus
-        // splits out of BOTH touch models onto the pen plane; its heartbeat coroutine keeps a
-        // stationary held stroke alive (and its cancellation lifts everything on teardown).
-        val stylus = remember(handle) {
-            if (NativeBridge.nativeHostSupportsPen(handle)) StylusStream(handle) else null
-        }
-        if (stylus != null) {
-            LaunchedEffect(stylus) { stylus.heartbeatLoop() }
-        }
        Box(
            Modifier.fillMaxSize().pointerInput(handle, touchMode) {
                when (touchMode) {
-                    TouchMode.TOUCH -> streamTouchPassthrough(handle, stylus)
+                    TouchMode.TOUCH -> streamTouchPassthrough(handle)
                    else -> streamTouchInput(
                        handle,
-                        stylus,
                        trackpad = touchMode == TouchMode.TRACKPAD,
-                        invertScroll = initialSettings.invertScroll,
                        onCycleStats = { statsVerbosity = statsVerbosity.next() },
                        onKeyboard = { show -> keyCapture?.setImeVisible(show) },
                    )
@@ -540,35 +423,14 @@ private fun ExitChordHint(modifier: Modifier = Modifier) {
    )
 }

-/**
- * The remote-pointer mode cue: while active the remote's keys are remapped (D-pad glides the host
- * cursor, SELECT clicks), so the overlay both confirms the toggle and teaches the vocabulary.
- */
-@Composable
-private fun RemotePointerHint(modifier: Modifier = Modifier) {
-    Text(
-        "Remote pointer — SELECT click · play/pause right-click · hold SELECT to exit",
-        modifier = modifier
-            .background(Color.Black.copy(alpha = 0.55f), RoundedCornerShape(8.dp))
-            .padding(horizontal = 14.dp, vertical = 8.dp),
-        color = Color.White,
-        fontSize = 15.sp,
-    )
-}
-
 /**
 * Invisible focus anchor for typing on the host: the three-finger swipe summons the device IME
- * onto this view. Two IME models, picked by the host's capabilities:
- *  * **Text path** ([textHandle] set — the host advertised `HOST_CAP_TEXT_INPUT`): a real
- *    editable [HostTextConnection], so the IME gives autocorrect, gesture typing, non-Latin
- *    composition and emoji, all mirrored to the host as committed text + diffs.
- *  * **Fallback** (older host): `TYPE_NULL` puts the IME in "dumb keyboard" mode — raw
- *    [KeyEvent]s flow through `MainActivity.dispatchKeyEvent` → `Keymap.toVk` → the host, the
- *    exact path a hardware keyboard takes (with the IME-shift wrap documented there).
- *
- * Doubles as the pointer-capture grab target: a grab needs a focusable view, and captured-pointer
- * events are delivered to it (routed to [MouseForwarder.onCapturedPointer] via the listener the
- * stream screen installs).
+ * onto this view. `TYPE_NULL` puts the IME in "dumb keyboard" mode — it delivers raw [KeyEvent]s
+ * (no composing text, no autocorrect), which flow through `MainActivity.dispatchKeyEvent` →
+ * `Keymap.toVk` → the host, the exact path a hardware keyboard takes. Text an IME insists on
+ * committing instead still arrives: the non-editable [BaseInputConnection] synthesizes KeyEvents
+ * for it via `KeyCharacterMap` (with Shift carried as meta state — see the IME-shift wrap in
+ * `MainActivity.dispatchKeyEvent`).
 */
 private class KeyCaptureView(context: Context) : View(context) {
    init {
@@ -576,171 +438,22 @@ private class KeyCaptureView(context: Context) : View(context) {
        isFocusableInTouchMode = true
    }

-    /** The session handle when the host types committed text; `0` = VK-only fallback. */
-    var textHandle: Long = 0L
+    override fun onCheckIsTextEditor(): Boolean = true

-    /** Whether [setImeVisible] last showed the IME — for toggle-style callers (remote pointer). */
-    var imeShown = false
-        private set
-
-    override fun onCheckIsTextEditor(): Boolean = imeShown
-
-    override fun onCreateInputConnection(outAttrs: EditorInfo): InputConnection? {
-        // Only an editor while the user has SUMMONED the keyboard (gesture / remote toggle).
-        // This view holds focus for the whole stream (it's the capture anchor), and with an
-        // always-live editable connection the IME counts input as active on it — TV IMEs then
-        // pop their UI the moment a PHYSICAL keyboard key arrives. With no connection, hardware
-        // typing stays on the raw dispatchKeyEvent → Keymap → wire path and no keyboard appears.
-        if (!imeShown) return null
-        outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI or
-            EditorInfo.IME_FLAG_NO_FULLSCREEN or EditorInfo.IME_FLAG_NO_ENTER_ACTION
-        return if (textHandle != 0L) {
-            outAttrs.inputType = InputType.TYPE_CLASS_TEXT or
-                InputType.TYPE_TEXT_FLAG_AUTO_CORRECT or InputType.TYPE_TEXT_FLAG_MULTI_LINE
-            HostTextConnection(this, textHandle)
-        } else {
-            outAttrs.inputType = InputType.TYPE_NULL
-            BaseInputConnection(this, false)
-        }
+    override fun onCreateInputConnection(outAttrs: EditorInfo): InputConnection {
+        outAttrs.inputType = InputType.TYPE_NULL
+        outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI or EditorInfo.IME_FLAG_NO_FULLSCREEN
+        return BaseInputConnection(this, false)
    }

    fun setImeVisible(show: Boolean) {
        val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
            ?: return
-        imeShown = show
        if (show) {
            requestFocus()
-            // The view may already be focused from a null-connection state — restart so the
-            // framework re-queries onCreateInputConnection with the gate now open.
-            imm.restartInput(this)
            imm.showSoftInput(this, 0)
        } else {
            imm.hideSoftInputFromWindow(windowToken, 0)
-            imm.restartInput(this) // gate closed — drop the editable connection
        }
    }
-
-    /**
-     * BACK while the summoned keyboard is up: the IME consumes it pre-IME to dismiss itself, so
-     * [setImeVisible] never hears about it — sync the gate here or a stale `imeShown` leaves the
-     * editable connection live and physical typing re-pops the keyboard.
-     */
-    override fun onKeyPreIme(keyCode: Int, event: KeyEvent): Boolean {
-        if (keyCode == KeyEvent.KEYCODE_BACK && imeShown && event.action == KeyEvent.ACTION_UP) {
-            imeShown = false
-            (context.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager)
-                ?.restartInput(this)
-        }
-        return super.onKeyPreIme(keyCode, event)
-    }
-}
-
-/**
- * IME → host text bridge (the `HOST_CAP_TEXT_INPUT` path): a real **editable** connection, so
- * the IME runs its full machinery (autocorrect, gesture typing, non-Latin composition), mirrored
- * to the host as it happens. The one piece of host-side state tracked is *what the host currently
- * shows of the active composition* ([sentComposition]): composing updates send a common-prefix
- * diff (backspaces + the new suffix) so corrections materialize live on the host; a commit
- * settles it. [setComposingRegion] adopts already-committed text as the active composition
- * (autocorrect-revert / backspace-into-word flows), so the next update diffs against it instead
- * of retyping. Newlines become Enter taps; [deleteSurroundingText] becomes Backspace/Delete taps.
- *
- * Known approximation: diff lengths are counted in Unicode scalars, assuming one host Backspace
- * deletes one scalar — true for the composition text IMEs actually produce (emoji and other
- * multi-unit graphemes commit directly rather than composing).
- */
-private class HostTextConnection(
-    view: KeyCaptureView,
-    private val handle: Long,
-) : BaseInputConnection(view, true) {
-    /** What the host currently shows of the active composition ("" = none). */
-    private var sentComposition = ""
-
-    override fun commitText(text: CharSequence, newCursorPosition: Int): Boolean {
-        retype(text.toString())
-        sentComposition = ""
-        val ok = super.commitText(text, newCursorPosition)
-        trimEditable()
-        return ok
-    }
-
-    override fun setComposingText(text: CharSequence, newCursorPosition: Int): Boolean {
-        retype(text.toString())
-        return super.setComposingText(text, newCursorPosition)
-    }
-
-    override fun finishComposingText(): Boolean {
-        // The composition text stands as committed — the host already shows it verbatim.
-        sentComposition = ""
-        return super.finishComposingText()
-    }
-
-    override fun setComposingRegion(start: Int, end: Int): Boolean {
-        val e = editable
-        if (e != null) {
-            val a = start.coerceIn(0, e.length)
-            val b = end.coerceIn(0, e.length)
-            sentComposition = e.subSequence(minOf(a, b), maxOf(a, b)).toString()
-        }
-        return super.setComposingRegion(start, end)
-    }
-
-    override fun deleteSurroundingText(beforeLength: Int, afterLength: Int): Boolean {
-        repeat(beforeLength.coerceIn(0, MAX_TAPS)) { tapVk(VK_BACK) }
-        repeat(afterLength.coerceIn(0, MAX_TAPS)) { tapVk(VK_DELETE) }
-        return super.deleteSurroundingText(beforeLength, afterLength)
-    }
-
-    override fun performEditorAction(actionCode: Int): Boolean {
-        tapVk(VK_RETURN)
-        return true
-    }
-
-    /** Replace the host's view of the composition with [text] via a common-prefix diff. */
-    private fun retype(text: String) {
-        var common = sentComposition.commonPrefixWith(text)
-        // Never split a surrogate pair mid-diff — back off to the pair boundary.
-        if (common.isNotEmpty() && common.last().isHighSurrogate()) {
-            common = common.dropLast(1)
-        }
-        val stale = sentComposition.substring(common.length)
-        repeat(stale.codePointCount(0, stale.length).coerceAtMost(MAX_TAPS)) { tapVk(VK_BACK) }
-        sendText(text.substring(common.length))
-        sentComposition = text
-    }
-
-    /** Forward literal text, turning newlines into Enter taps (control chars never ride text). */
-    private fun sendText(s: String) {
-        var chunk = StringBuilder()
-        for (ch in s) {
-            if (ch == '\n') {
-                if (chunk.isNotEmpty()) {
-                    NativeBridge.nativeSendText(handle, chunk.toString())
-                    chunk = StringBuilder()
-                }
-                tapVk(VK_RETURN)
-            } else {
-                chunk.append(ch)
-            }
-        }
-        if (chunk.isNotEmpty()) NativeBridge.nativeSendText(handle, chunk.toString())
-    }
-
-    private fun tapVk(vk: Int) {
-        NativeBridge.nativeSendKey(handle, vk, true, 0)
-        NativeBridge.nativeSendKey(handle, vk, false, 0)
-    }
-
-    /** Bound the mirror buffer: once nothing is composing, old text serves no purpose. */
-    private fun trimEditable() {
-        val e = editable ?: return
-        if (getComposingSpanStart(e) == -1 && e.length > 4000) e.clear()
-    }
-
-    private companion object {
-        const val VK_BACK = 0x08
-        const val VK_RETURN = 0x0D
-        const val VK_DELETE = 0x2E
-        const val MAX_TAPS = 256
-    }
 }
@@ -1,195 +0,0 @@
-package io.unom.punktfunk
-
-import android.view.MotionEvent
-import androidx.compose.ui.ExperimentalComposeUiApi
-import androidx.compose.ui.input.pointer.PointerEvent
-import androidx.compose.ui.input.pointer.PointerType
-import androidx.compose.ui.unit.IntSize
-import io.unom.punktfunk.kit.NativeBridge
-import kotlinx.coroutines.delay
-
-// Wire PEN_* state bits (punktfunk_core::quic::pen; mirrored, asserted by the Rust shim's docs).
-private const val PEN_IN_RANGE = 1f
-private const val PEN_TOUCHING = 2f
-private const val PEN_BARREL1 = 4f
-private const val PEN_BARREL2 = 8f
-private const val STRIDE = 10
-private const val MAX_SAMPLES = 8
-
-/**
- * Android stylus → the state-full pen plane (design/pen-tablet-input.md §7): pressure, tilt
- * (`AXIS_TILT`, radians from the surface normal), azimuth (`AXIS_ORIENTATION` — Android's 0 =
- * "pointed away from the user" IS the wire's north, no offset needed), hover with
- * `AXIS_DISTANCE`, the eraser tool, both stylus barrel buttons, and historical (coalesced)
- * samples batched oldest-first for full capture-rate fidelity. Android has no barrel-roll
- * axis — roll stays unknown on this client.
- *
- * Both touch loops call [intercept] first; stylus/eraser pointers are consumed here (against a
- * pen-capable host) and never reach the finger paths, independent of the touch-input mode.
- * [heartbeatLoop] implements the ≤100 ms keepalive wire contract: a stationary held stylus is
- * silent in Android's input pipeline, and the host force-releases a stroke after 200 ms
- * without samples.
- */
-internal class StylusStream(private val handle: Long) {
-    private var inRange = false
-    private var touching = false
-    private var sawHover = false
-    private val last = FloatArray(STRIDE)
-    private val batch = FloatArray(MAX_SAMPLES * STRIDE)
-
-    init {
-        idle(last)
-    }
-
-    /**
-     * Consume the event's stylus pointers into pen samples. Returns true when this event
-     * carried any (the caller's finger/gesture handling must then skip those changes).
-     */
-    @OptIn(ExperimentalComposeUiApi::class)
-    fun intercept(ev: PointerEvent, size: IntSize): Boolean {
-        val stylusChanges = ev.changes.filter {
-            it.type == PointerType.Stylus || it.type == PointerType.Eraser
-        }
-        if (stylusChanges.isEmpty()) return false
-        stylusChanges.forEach { it.consume() }
-        val me = ev.motionEvent ?: return true
-        if (size.width <= 0 || size.height <= 0) return true
-        // At most one stylus exists — find its pointer index by tool type.
-        val idx = (0 until me.pointerCount).firstOrNull {
-            me.getToolType(it) == MotionEvent.TOOL_TYPE_STYLUS ||
-                me.getToolType(it) == MotionEvent.TOOL_TYPE_ERASER
-        } ?: return true
-
-        when (me.actionMasked) {
-            MotionEvent.ACTION_DOWN, MotionEvent.ACTION_POINTER_DOWN,
-            MotionEvent.ACTION_MOVE,
-            -> {
-                touching = true
-                inRange = true
-                emitSamples(me, idx, size)
-            }
-            MotionEvent.ACTION_HOVER_ENTER, MotionEvent.ACTION_HOVER_MOVE -> {
-                sawHover = true
-                inRange = true
-                touching = false
-                emitSamples(me, idx, size)
-            }
-            MotionEvent.ACTION_UP, MotionEvent.ACTION_POINTER_UP -> {
-                touching = false
-                // Hover-capable hardware keeps proximity (HOVER_EXIT owns the leave);
-                // anything else leaves range on lift — the host never parks a phantom pen.
-                inRange = sawHover
-                emitSamples(me, idx, size)
-            }
-            MotionEvent.ACTION_HOVER_EXIT, MotionEvent.ACTION_CANCEL -> release()
-            else -> {}
-        }
-        return true
-    }
-
-    /** Session/composition teardown: leave range so the host lifts anything still inked. */
-    fun reset() {
-        if (inRange || touching) release()
-        sawHover = false
-    }
-
-    /** The ≤100 ms keepalive (80 ms leaves headroom for one lost datagram). Runs until
-     *  cancelled; resends the last state-full sample while the pen is in range. */
-    suspend fun heartbeatLoop() {
-        try {
-            while (true) {
-                delay(80)
-                if (inRange || touching) {
-                    last[9] = 0f // dt
-                    NativeBridge.nativeSendPen(handle, last, 1)
-                }
-            }
-        } finally {
-            reset()
-        }
-    }
-
-    private fun release() {
-        touching = false
-        inRange = false
-        last[0] = 0f // state: out of range
-        last[4] = 0f // pressure
-        NativeBridge.nativeSendPen(handle, last, 1)
-    }
-
-    /** Historical (coalesced) samples oldest-first, then the current one — a single batch. */
-    private fun emitSamples(me: MotionEvent, idx: Int, size: IntSize) {
-        val history = minOf(me.historySize, MAX_SAMPLES - 1)
-        var count = 0
-        var prevT = if (history > 0) me.getHistoricalEventTime(0) else me.eventTime
-        for (h in (me.historySize - history) until me.historySize) {
-            val t = me.getHistoricalEventTime(h)
-            fill(
-                batch, count * STRIDE, size,
-                x = me.getHistoricalX(idx, h), y = me.getHistoricalY(idx, h),
-                pressure = me.getHistoricalPressure(idx, h),
-                tiltRad = me.getHistoricalAxisValue(MotionEvent.AXIS_TILT, idx, h),
-                orientRad = me.getHistoricalAxisValue(MotionEvent.AXIS_ORIENTATION, idx, h),
-                distance = me.getHistoricalAxisValue(MotionEvent.AXIS_DISTANCE, idx, h),
-                buttons = me.buttonState, tool = me.getToolType(idx),
-                dtUs = ((t - prevT) * 1000).coerceIn(0, 65535).toFloat(),
-            )
-            prevT = t
-            count++
-        }
-        fill(
-            batch, count * STRIDE, size,
-            x = me.getX(idx), y = me.getY(idx), pressure = me.getPressure(idx),
-            tiltRad = me.getAxisValue(MotionEvent.AXIS_TILT, idx),
-            orientRad = me.getAxisValue(MotionEvent.AXIS_ORIENTATION, idx),
-            distance = me.getAxisValue(MotionEvent.AXIS_DISTANCE, idx),
-            buttons = me.buttonState, tool = me.getToolType(idx),
-            dtUs = ((me.eventTime - prevT) * 1000).coerceIn(0, 65535).toFloat(),
-        )
-        count++
-        batch.copyInto(last, 0, (count - 1) * STRIDE, count * STRIDE)
-        NativeBridge.nativeSendPen(handle, batch, count)
-    }
-
-    private fun fill(
-        out: FloatArray,
-        off: Int,
-        size: IntSize,
-        x: Float,
-        y: Float,
-        pressure: Float,
-        tiltRad: Float,
-        orientRad: Float,
-        distance: Float,
-        buttons: Int,
-        tool: Int,
-        dtUs: Float,
-    ) {
-        var state = 0f
-        if (inRange || touching) state += PEN_IN_RANGE
-        if (touching) state += PEN_TOUCHING
-        if (buttons and MotionEvent.BUTTON_STYLUS_PRIMARY != 0) state += PEN_BARREL1
-        if (buttons and MotionEvent.BUTTON_STYLUS_SECONDARY != 0) state += PEN_BARREL2
-        out[off + 0] = state
-        out[off + 1] = if (tool == MotionEvent.TOOL_TYPE_ERASER) 1f else 0f
-        out[off + 2] = (x / (size.width - 1).coerceAtLeast(1)).coerceIn(0f, 1f)
-        out[off + 3] = (y / (size.height - 1).coerceAtLeast(1)).coerceIn(0f, 1f)
-        out[off + 4] = if (touching) pressure.coerceIn(0f, 1f) else 0f
-        // AXIS_DISTANCE units are device-arbitrary; 0..1 covers real hardware, and 0 while
-        // hovering legitimately means "at the hover floor".
-        out[off + 5] = if (touching) 0f else distance.coerceIn(0f, 1f)
-        out[off + 6] = Math.toDegrees(tiltRad.toDouble()).toFloat().coerceIn(0f, 90f)
-        // AXIS_ORIENTATION: 0 = pointed away from the user (= wire north), clockwise, −π..π.
-        out[off + 7] = ((Math.toDegrees(orientRad.toDouble()) + 360.0) % 360.0).toFloat()
-        out[off + 8] = -1f // no barrel-roll axis on Android
-        out[off + 9] = dtUs
-    }
-
-    private fun idle(out: FloatArray) {
-        out.fill(0f)
-        out[5] = -1f // distance unknown
-        out[6] = -1f // tilt unknown
-        out[7] = -1f // azimuth unknown
-        out[8] = -1f // roll unknown
-    }
-}
@@ -1,11 +1,9 @@
 package io.unom.punktfunk

 import androidx.compose.foundation.gestures.awaitEachGesture
-import androidx.compose.ui.input.pointer.AwaitPointerEventScope
+import androidx.compose.foundation.gestures.awaitFirstDown
 import androidx.compose.ui.input.pointer.PointerId
-import androidx.compose.ui.input.pointer.PointerInputChange
 import androidx.compose.ui.input.pointer.PointerInputScope
-import androidx.compose.ui.input.pointer.PointerType
 import androidx.compose.ui.input.pointer.changedToDownIgnoreConsumed
 import androidx.compose.ui.input.pointer.changedToUpIgnoreConsumed
 import androidx.compose.ui.input.pointer.positionChanged
@@ -58,26 +56,7 @@ private const val ACCEL_MAX = 3.0f
 * normalizes and maps into the output). On teardown (stream leaves composition) every still-held
 * contact is lifted so nothing stays stuck on the host.
 */
-/** Whether this change belongs to the stylus lane (only when a pen-capable host is live). */
-private fun isStylus(c: PointerInputChange, stylus: StylusStream?): Boolean =
-    stylus != null && (c.type == PointerType.Stylus || c.type == PointerType.Eraser)
-
-/** [awaitFirstDown] with the stylus lane split out: pen events feed [stylus] and never start a
- *  mouse/touch gesture. Toward a pen-less host ([stylus] == null) a stylus stays a finger. */
-private suspend fun AwaitPointerEventScope.awaitFirstFingerDown(
-    stylus: StylusStream?,
-): PointerInputChange {
-    while (true) {
-        val ev = awaitPointerEvent()
-        stylus?.intercept(ev, size)
-        val down = ev.changes.firstOrNull {
-            it.changedToDownIgnoreConsumed() && !isStylus(it, stylus)
-        }
-        if (down != null) return down
-    }
-}
-
-internal suspend fun PointerInputScope.streamTouchPassthrough(handle: Long, stylus: StylusStream?) {
+internal suspend fun PointerInputScope.streamTouchPassthrough(handle: Long) {
    val ids = mutableMapOf<PointerId, Int>()
    fun alloc(p: PointerId): Int {
        var id = 0
@@ -89,12 +68,10 @@ internal suspend fun PointerInputScope.streamTouchPassthrough(handle: Long, styl
        awaitPointerEventScope {
            while (true) {
                val ev = awaitPointerEvent()
-                stylus?.intercept(ev, size)
                val sw = size.width
                val sh = size.height
                if (sw <= 0 || sh <= 0) continue
                for (c in ev.changes) {
-                    if (isStylus(c, stylus)) continue // the pen plane owns it
                    val x = c.position.x.roundToInt().coerceIn(0, sw - 1)
                    val y = c.position.y.roundToInt().coerceIn(0, sh - 1)
                    when {
@@ -121,13 +98,10 @@ internal suspend fun PointerInputScope.streamTouchPassthrough(handle: Long, styl

 internal suspend fun PointerInputScope.streamTouchInput(
    handle: Long,
-    stylus: StylusStream?,
    trackpad: Boolean,
-    invertScroll: Boolean,
    onCycleStats: () -> Unit,
    onKeyboard: (show: Boolean) -> Unit,
 ) {
-    val scrollDir = if (invertScroll) -1 else 1
    var lastTapUp = 0L
    var lastTapX = 0f
    var lastTapY = 0f
@@ -144,7 +118,7 @@ internal suspend fun PointerInputScope.streamTouchInput(
        )
    }
    awaitEachGesture {
-        val down = awaitFirstFingerDown(stylus)
+        val down = awaitFirstDown(requireUnconsumed = false)
        val startX = down.position.x
        val startY = down.position.y
        // A touch landing just after a quick tap nearby = tap-and-drag: hold the left
@@ -181,8 +155,7 @@ internal suspend fun PointerInputScope.streamTouchInput(

        while (true) {
            val ev = awaitPointerEvent()
-            stylus?.intercept(ev, size)
-            val pressed = ev.changes.filter { it.pressed && !isStylus(it, stylus) }
+            val pressed = ev.changes.filter { it.pressed }
            if (pressed.isEmpty()) {
                upTime = ev.changes.firstOrNull()?.uptimeMillis ?: upTime
                break
@@ -211,12 +184,12 @@ internal suspend fun PointerInputScope.streamTouchInput(
                val sy = ((prevCy - cy) / SCROLL_DIV).toInt() // finger up → wheel up
                val sx = ((cx - prevCx) / SCROLL_DIV).toInt()
                if (sy != 0) {
-                    NativeBridge.nativeSendScroll(handle, 0, sy * 120 * scrollDir)
+                    NativeBridge.nativeSendScroll(handle, 0, sy * 120)
                    prevCy = cy
                    moved = true
                }
                if (sx != 0) {
-                    NativeBridge.nativeSendScroll(handle, 1, sx * 120 * scrollDir)
+                    NativeBridge.nativeSendScroll(handle, 1, sx * 120)
                    prevCx = cx
                    moved = true
                }
@@ -106,17 +106,6 @@ object Keymap {
        KeyEvent.KEYCODE_DPAD_UP -> 0x26
        KeyEvent.KEYCODE_DPAD_RIGHT -> 0x27
        KeyEvent.KEYCODE_DPAD_DOWN -> 0x28
-        // TV-remote SELECT = Enter (a gamepad's press routes via SOURCE_GAMEPAD before this).
-        KeyEvent.KEYCODE_DPAD_CENTER -> 0x0D
-
-        // Consumer/media keys — forwarded to the host while streaming (volume stays local:
-        // MainActivity's pass-through list wins before the map is consulted).
-        KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE,
-        KeyEvent.KEYCODE_MEDIA_PLAY,
-        KeyEvent.KEYCODE_MEDIA_PAUSE -> 0xB3 // VK_MEDIA_PLAY_PAUSE
-        KeyEvent.KEYCODE_MEDIA_NEXT -> 0xB0 // VK_MEDIA_NEXT_TRACK
-        KeyEvent.KEYCODE_MEDIA_PREVIOUS -> 0xB1 // VK_MEDIA_PREV_TRACK
-        KeyEvent.KEYCODE_MEDIA_STOP -> 0xB2 // VK_MEDIA_STOP

        // Modifiers (L/R-specific VKs; the host folds the generic ones onto the left variant)
        KeyEvent.KEYCODE_SHIFT_LEFT -> 0xA0
@@ -287,66 +287,6 @@ object NativeBridge {
    /** One key transition. vk: Windows VK (0 = dropped by Rust). mods: VK modifier mask (0 for now). */
    external fun nativeSendKey(handle: Long, vk: Int, down: Boolean, mods: Int)

-    /**
-     * Whether the host advertised full-fidelity stylus injection (`HOST_CAP_PEN`) — the gate
-     * for splitting stylus pointers out of the touch path onto the pen plane. False on `0`.
-     */
-    external fun nativeHostSupportsPen(handle: Long): Boolean
-
-    /**
-     * One stylus batch of STATE-FULL samples (the pen plane; design/pen-tablet-input.md §7):
-     * [count] × 10 floats, oldest first — `[state, tool, x, y, pressure, distance, tilt_deg,
-     * azimuth_deg, roll_deg, dt_us]`. `state` = the wire in-range/touching/barrel bits; `tool`
-     * 0=pen 1=eraser; x/y/pressure/distance normalized 0..1; distance/tilt/azimuth/roll < 0 =
-     * unknown. Send only when [nativeHostSupportsPen]; repeat the last sample ≤100 ms while the
-     * pen is in range (the host force-releases a silent stroke after 200 ms).
-     */
-    external fun nativeSendPen(handle: Long, samples: FloatArray, count: Int)
-
-    /**
-     * Whether the host advertised committed-text injection (`HOST_CAP_TEXT_INPUT`) — its inject
-     * backend can type Unicode text directly. Picks the real IME `InputConnection` (autocorrect,
-     * gesture typing, non-Latin scripts) over the TYPE_NULL raw-key fallback. False on `0`.
-     */
-    external fun nativeTextInputSupported(handle: Long): Boolean
-
-    /**
-     * Committed IME text → one `TextInput` wire event per Unicode scalar, in order. Control
-     * characters are skipped natively (Enter/Backspace ride [nativeSendKey]). Only meaningful
-     * when [nativeTextInputSupported] returned true — older hosts ignore the events.
-     */
-    external fun nativeSendText(handle: Long, text: String)
-
-    // ---- Shared clipboard (text v1): Kotlin drives ClipboardManager, Rust the protocol ----
-    // Opt-in per session (nativeClipControl). Local copies are announced as lazy offers; bytes
-    // cross only when the host pastes (a "fetch:" event answered by nativeClipServeText). Host
-    // copies arrive as "offer:" events, fetched eagerly into the system clipboard.
-
-    /** Whether the host advertised a working shared-clipboard service (HOST_CAP_CLIPBOARD). */
-    external fun nativeClipSupported(handle: Long): Boolean
-
-    /** Session-level clipboard opt-in/out; nothing happens until enabled=true crosses. */
-    external fun nativeClipControl(handle: Long, enabled: Boolean)
-
-    /** Announce "this device's clipboard now holds text". [seq]: monotonic, newest wins. */
-    external fun nativeClipOfferText(handle: Long, seq: Int)
-
-    /** Pull the text of the host's offer [seq] → transfer id echoed on "data:"/"error:", or -1. */
-    external fun nativeClipFetchText(handle: Long, seq: Int): Int
-
-    /** Answer a "fetch:" event with the clipboard's current text (the host is pasting). */
-    external fun nativeClipServeText(handle: Long, reqId: Int, text: String)
-
-    /** Abort a clipboard transfer by id (either direction). */
-    external fun nativeClipCancel(handle: Long, id: Int)
-
-    /**
-     * Block ≤250 ms for the next clipboard event, as a compact string: `state:<0|1>` ·
-     * `offer:<seq>:<hasText>` · `fetch:<reqId>` · `data:<xferId>:<text>` · `cancel:<id>` ·
-     * `error:<id>:<code>` · `closed` (session gone) — null on timeout. Dedicated poll thread.
-     */
-    external fun nativeNextClip(handle: Long): String?
-
    // ---- Gamepad: each controller forwarded on its own wire pad index (0..15, low byte of flags) ----
    // The pad index is assigned per Android device by GamepadRouter; a single controller lands on 0,
    // so its wire is byte-identical to the old single-pad path. The core folds the per-transition
@@ -1,182 +0,0 @@
-//! Shared-clipboard plane (text-only v1): Kotlin drives the Android `ClipboardManager`, these
-//! shims drive [`punktfunk_core::client::NativeClient`]'s clipboard surface.
-//!
-//! Model (mirrors the desktop clients): opt-in via `nativeClipControl(true)`; local copies are
-//! announced lazily as format-list offers (`nativeClipOfferText`) and the bytes cross only when
-//! the host pastes (a `fetch` event answered by `nativeClipServeText`); a host copy arrives as an
-//! `offer` event, which the Kotlin side fetches eagerly (Android's clipboard has no lazy provider
-//! path worth the complexity) and lands in the system clipboard on the `data` event.
-//!
-//! Events cross to Kotlin as compact strings from the blocking `nativeNextClip` poll (drained on
-//! a dedicated thread, same pattern as `nativeNextRumble`):
-//! `state:<0|1>` · `offer:<seq>:<has_text 0|1>` · `fetch:<req_id>` · `data:<xfer_id>:<text>` ·
-//! `cancel:<id>` · `error:<id>:<code>` · `closed` — null on a poll timeout. Non-text fetch
-//! requests are cancelled natively (only text is ever offered, so they shouldn't occur).
-
-use std::time::Duration;
-
-use jni::objects::{JObject, JString};
-use jni::sys::{jboolean, jint, jlong, jstring};
-use jni::JNIEnv;
-use punktfunk_core::clipboard::ClipEventCore;
-use punktfunk_core::error::PunktfunkError;
-use punktfunk_core::quic::{ClipKind, CLIP_FILE_INDEX_NONE, HOST_CAP_CLIPBOARD};
-
-use super::SessionHandle;
-
-/// The portable wire MIME both ends map to their platform text type.
-const TEXT_MIME: &str = "text/plain;charset=utf-8";
-
-/// Deref the opaque handle (`0` → `None`).
-///
-/// SAFETY: live handle per the nativeConnect/nativeClose contract; every method used is `&self`
-/// on the `Sync` connector.
-fn client(handle: jlong) -> Option<&'static SessionHandle> {
-    if handle == 0 {
-        return None;
-    }
-    // SAFETY: see the function docs — the Kotlin side guarantees the handle outlives the call.
-    Some(unsafe { &*(handle as *const SessionHandle) })
-}
-
-/// `NativeBridge.nativeClipSupported(handle)` — the host advertised `HOST_CAP_CLIPBOARD`.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeClipSupported(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-) -> jboolean {
-    client(handle).map_or(0, |h| {
-        u8::from(h.client.host_caps() & HOST_CAP_CLIPBOARD != 0)
-    })
-}
-
-/// `NativeBridge.nativeClipControl(handle, enabled)` — session-level opt-in/out. Nothing
-/// clipboard-related happens on either side until an `enabled: true` crosses.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeClipControl(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    enabled: jboolean,
-) {
-    if let Some(h) = client(handle) {
-        let _ = h.client.clip_control(enabled != 0, 0);
-    }
-}
-
-/// `NativeBridge.nativeClipOfferText(handle, seq)` — announce "the Android clipboard now holds
-/// text" (format list only; bytes cross when the host fetches). `seq` is Kotlin's monotonic
-/// counter, newest wins.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeClipOfferText(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    seq: jint,
-) {
-    if let Some(h) = client(handle) {
-        let _ = h.client.clip_offer(
-            seq as u32,
-            vec![ClipKind {
-                mime: TEXT_MIME.into(),
-                size_hint: 0,
-            }],
-        );
-    }
-}
-
-/// `NativeBridge.nativeClipFetchText(handle, seq)` — pull the text of the host's offer `seq`.
-/// Returns the transfer id echoed on the matching `data:`/`error:` event, or −1.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeClipFetchText(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    seq: jint,
-) -> jint {
-    client(handle)
-        .and_then(|h| {
-            h.client
-                .clip_fetch(seq as u32, TEXT_MIME.into(), CLIP_FILE_INDEX_NONE)
-                .ok()
-        })
-        .map_or(-1, |xfer| xfer as jint)
-}
-
-/// `NativeBridge.nativeClipServeText(handle, reqId, text)` — answer a `fetch:` event with the
-/// clipboard's current text (the host is pasting our offer).
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeClipServeText(
-    mut env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    req_id: jint,
-    text: JString,
-) {
-    let Some(h) = client(handle) else { return };
-    let Ok(s) = env.get_string(&text) else {
-        let _ = h.client.clip_cancel(req_id as u32);
-        return;
-    };
-    let _ = h
-        .client
-        .clip_serve(req_id as u32, String::from(s).into_bytes(), true);
-}
-
-/// `NativeBridge.nativeClipCancel(handle, id)` — abort a transfer (either direction).
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeClipCancel(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    id: jint,
-) {
-    if let Some(h) = client(handle) {
-        let _ = h.client.clip_cancel(id as u32);
-    }
-}
-
-/// `NativeBridge.nativeNextClip(handle)` — block ≤250 ms for the next clipboard event, encoded
-/// as a compact string (module docs); null on timeout, `"closed"` once the session is gone.
-/// Call from a dedicated poll thread.
-///
-/// Text payloads ride `data:<xfer_id>:<text>` decoded lossily — safe because the phase-0
-/// clipboard task delivers a whole payload in ONE event (`last = true`), so a chunk boundary
-/// can never split a UTF-8 sequence.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeNextClip(
-    env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-) -> jstring {
-    let Some(h) = client(handle) else {
-        return std::ptr::null_mut();
-    };
-    let msg = match h.client.next_clip(Duration::from_millis(250)) {
-        Ok(ClipEventCore::State { enabled, .. }) => format!("state:{}", u8::from(enabled)),
-        Ok(ClipEventCore::RemoteOffer { seq, kinds }) => {
-            let has_text = kinds.iter().any(|k| k.mime.starts_with("text/plain"));
-            format!("offer:{seq}:{}", u8::from(has_text))
-        }
-        Ok(ClipEventCore::FetchRequest { req_id, mime, .. }) => {
-            if mime.starts_with("text/plain") {
-                format!("fetch:{req_id}")
-            } else {
-                // We only ever offer text; cancel anything else rather than stall the host.
-                let _ = h.client.clip_cancel(req_id);
-                return std::ptr::null_mut();
-            }
-        }
-        Ok(ClipEventCore::Data { xfer_id, bytes, .. }) => {
-            format!("data:{xfer_id}:{}", String::from_utf8_lossy(&bytes))
-        }
-        Ok(ClipEventCore::Cancelled { id }) => format!("cancel:{id}"),
-        Ok(ClipEventCore::Error { id, code }) => format!("error:{id}:{code}"),
-        Err(PunktfunkError::NoFrame) => return std::ptr::null_mut(),
-        Err(_) => "closed".into(),
-    };
-    env.new_string(msg)
-        .map(|s| s.into_raw())
-        .unwrap_or(std::ptr::null_mut())
-}
@@ -201,9 +201,6 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeConnect<'lo
        // No display-volume forwarding from Android yet (the panel tone-maps PQ itself via the
        // Surface dataspace + static metadata) — the host keeps its virtual-display EDID defaults.
        None,
-        // No non-video caps: this client does not render the host cursor locally (no shape/state
-        // planes in the jni surface), so advertising CLIENT_CAP_CURSOR would stream cursor-less.
-        0,
        launch,   // a store-qualified library id to boot into a game, or None for the desktop
        pin,      // Some → Crypto on host-fp mismatch
        identity, // owned (cert, key) PEM, or None (anonymous)
@@ -6,14 +6,11 @@
 //! conventions: buttons 1=left/2=middle/3=right/4=X1/5=X2; scroll axis 0=vertical/1=horizontal,
 //! signed 120-unit delta, +=up/right; keys are Windows VK (mapped from KEYCODE_* on the Kotlin side).

-use jni::objects::{JByteBuffer, JFloatArray, JObject, JString};
+use jni::objects::{JByteBuffer, JObject};
 use jni::sys::{jboolean, jint, jlong};
 use jni::JNIEnv;
 use punktfunk_core::input::{InputEvent, InputKind};
-use punktfunk_core::quic::{
-    PenSample, PenTool, RichInput, HID_REPORT_MAX, HOST_CAP_PEN, HOST_CAP_TEXT_INPUT,
-    PEN_ANGLE_UNKNOWN, PEN_BATCH_MAX, PEN_DISTANCE_UNKNOWN, PEN_TILT_UNKNOWN,
-};
+use punktfunk_core::quic::{RichInput, HID_REPORT_MAX};

 use super::SessionHandle;

@@ -148,132 +145,6 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeSendKey(
    send_event(handle, kind, vk as u32, 0, 0, mods as u32);
 }

-/// `NativeBridge.nativeTextInputSupported(handle)` — whether the host advertised
-/// `HOST_CAP_TEXT_INPUT` (its inject backend types committed text), so the Kotlin side can pick
-/// the real IME `InputConnection` over the TYPE_NULL raw-key fallback. `0` handle → false.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeTextInputSupported(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-) -> jboolean {
-    if handle == 0 {
-        return 0;
-    }
-    // SAFETY: live handle per the nativeConnect/nativeClose contract; host_caps is &self.
-    let h = unsafe { &*(handle as *const SessionHandle) };
-    u8::from(h.client.host_caps() & HOST_CAP_TEXT_INPUT != 0)
-}
-
-/// `NativeBridge.nativeHostSupportsPen(handle)` — the host advertised `HOST_CAP_PEN`, so the
-/// Kotlin side splits stylus pointers out of the touch path onto the pen plane
-/// (design/pen-tablet-input.md §7). `0` handle → false.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeHostSupportsPen(
-    _env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-) -> jboolean {
-    if handle == 0 {
-        return 0;
-    }
-    // SAFETY: live handle per the nativeConnect/nativeClose contract; host_caps is &self.
-    let h = unsafe { &*(handle as *const SessionHandle) };
-    u8::from(h.client.host_caps() & HOST_CAP_PEN != 0)
-}
-
-/// Floats per sample in the `nativeSendPen` flat array.
-const PEN_JNI_STRIDE: usize = 10;
-
-/// `NativeBridge.nativeSendPen(handle, samples, count)` — one stylus batch of STATE-FULL
-/// samples, `count` × [`PEN_JNI_STRIDE`] floats, oldest first:
-/// `[state, tool, x, y, pressure, distance, tilt_deg, azimuth_deg, roll_deg, dt_us]`.
-/// `state` = the wire `PEN_*` bits; `tool` 0=pen 1=eraser; `x`/`y`/`pressure`/`distance`
-/// normalized 0..1; `distance`/`tilt_deg`/`azimuth_deg`/`roll_deg` < 0 = unknown. Call only
-/// against a [`nativeHostSupportsPen`] host; the client heartbeats the last sample ≤100 ms
-/// while in range (Kotlin side — see `StylusStream`).
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeSendPen(
-    env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    samples: JFloatArray,
-    count: jint,
-) {
-    if handle == 0 || count <= 0 {
-        return;
-    }
-    let count = (count as usize).min(PEN_BATCH_MAX);
-    let mut buf = [0f32; PEN_BATCH_MAX * PEN_JNI_STRIDE];
-    let flat = &mut buf[..count * PEN_JNI_STRIDE];
-    if env.get_float_array_region(&samples, 0, flat).is_err() {
-        return; // short array — a bridge bug, never worth a crash on the input path
-    }
-    let mut batch = [PenSample::default(); PEN_BATCH_MAX];
-    for (slot, s) in batch.iter_mut().zip(flat.chunks_exact(PEN_JNI_STRIDE)) {
-        if !s[2].is_finite() || !s[3].is_finite() {
-            return; // never forward a NaN coordinate
-        }
-        *slot = PenSample {
-            state: s[0] as u8,
-            tool: if s[1] as u8 == 1 {
-                PenTool::Eraser
-            } else {
-                PenTool::Pen
-            },
-            x: s[2].clamp(0.0, 1.0),
-            y: s[3].clamp(0.0, 1.0),
-            pressure: (s[4].clamp(0.0, 1.0) * 65535.0) as u16,
-            distance: if s[5] < 0.0 {
-                PEN_DISTANCE_UNKNOWN
-            } else {
-                (s[5].clamp(0.0, 1.0) * 65534.0) as u16
-            },
-            tilt_deg: if s[6] < 0.0 {
-                PEN_TILT_UNKNOWN
-            } else {
-                (s[6].clamp(0.0, 90.0)) as u8
-            },
-            azimuth_deg: if s[7] < 0.0 {
-                PEN_ANGLE_UNKNOWN
-            } else {
-                (s[7] as u16) % 360
-            },
-            roll_deg: if s[8] < 0.0 {
-                PEN_ANGLE_UNKNOWN
-            } else {
-                (s[8] as u16) % 360
-            },
-            dt_us: s[9].clamp(0.0, 65535.0) as u16,
-        };
-    }
-    // SAFETY: live handle per the nativeConnect/nativeClose contract; send_pen is &self.
-    let h = unsafe { &*(handle as *const SessionHandle) };
-    let _ = h.client.send_pen(&batch[..count]);
-}
-
-/// `NativeBridge.nativeSendText(handle, text)` — committed IME text, one `TextInput` event per
-/// Unicode scalar (`code` = the scalar; multi-char commits are consecutive events in order).
-/// Control characters are skipped — Enter/Backspace/Tab ride the VK key path. Call only when
-/// [`Java_io_unom_punktfunk_kit_NativeBridge_nativeTextInputSupported`] returned true.
-#[no_mangle]
-pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeSendText(
-    mut env: JNIEnv,
-    _this: JObject,
-    handle: jlong,
-    text: JString,
-) {
-    if handle == 0 {
-        return;
-    }
-    let Ok(s) = env.get_string(&text) else {
-        return;
-    };
-    for ch in String::from(s).chars().filter(|c| !c.is_control()) {
-        send_event(handle, InputKind::TextInput, ch as u32, 0, 0, 0);
-    }
-}
-
 // ---- Gamepad: Kotlin captures (KeyEvent/MotionEvent) → NativeClient::send_input ---------------
 // Multi-pad model: each physical controller is forwarded on its own wire pad index (0..15), carried
 // in the low byte of `flags` on every per-pad event — the Kotlin side (`GamepadRouter`) assigns a
@@ -17,7 +17,6 @@
 //! TODO(M4 Android stage 1): client→host DualSense rich input (`send_rich_input`), mode
 //! renegotiation. Port the remaining orchestration from `clients/linux`.

-mod clipboard;
 mod connect;
 mod input;
 mod planes;
@@ -144,26 +144,14 @@ struct ContentView: View {
        // tap uses, so trust policy / WoL / the approval sheet all come along. Never starts a
        // parallel session — this drives the one `model` ContentView owns.
        .onOpenURL { handleDeepLink($0) }
-        #if os(iOS) || os(tvOS)
-        // Backgrounding driver. Only .background/.active matter; .inactive (a transient peek) is
-        // ignored so neither branch fires for a Control-Center pull.
-        //
-        // Backgrounding MUST end the session one way or the other: the app keeps running while
-        // streaming (the `audio` background mode plus a live audio session), so its QUIC connection
-        // keeps answering the host's keep-alives with the user long gone — the host has no way to
-        // tell that apart from someone watching, and the session survived indefinitely. Either hold
-        // it under the opt-in keep-alive (bounded by that path's own auto-disconnect timer) or end
-        // it here.
+        #if os(iOS)
+        // Background keep-alive driver (opt-in). Only .background/.active matter; .inactive (a
+        // transient peek) is ignored so the disconnect timer never starts for a Control-Center pull.
        .onChange(of: scenePhase) { _, phase in
            switch phase {
            case .background:
-                guard model.phase == .streaming else { break }
-                if backgroundKeepAlive {
+                if backgroundKeepAlive, model.phase == .streaming {
                    model.enterBackground(timeoutMinutes: backgroundTimeoutMinutes)
-                } else {
-                    // Not deliberate: the user may come straight back, so let the host linger the
-                    // display for a fast reconnect instead of tearing it down.
-                    model.disconnect(deliberate: false)
                }
            case .active:
                model.exitBackground()
@@ -171,11 +159,7 @@ struct ContentView: View {
                break
            }
        }
-        #endif
-        #if os(iOS)
-        // Live Activity lifecycle, driven from the model's published state. iPhone/iPad only —
-        // ActivityKit (and so `liveActivity`) does not exist on tvOS, which is why this stays in its
-        // own os(iOS) block rather than riding the backgrounding driver's.
+        // Live Activity lifecycle, driven from the model's published state.
        .onChange(of: model.phase) { _, phase in
            switch phase {
            case .streaming:
@@ -990,9 +974,7 @@ struct ContentView: View {
                rawValue: UInt32(clamping: gamepadType)) ?? .auto)
        if let name = ProcessInfo.processInfo.environment["PUNKTFUNK_REMOTE_GAMEPAD"],
           let g = PunktfunkConnection.GamepadType(name: name) {
-            // Back through resolveType so the lever is adopted as the session's setting: the
-            // per-pad arrivals declare it too, which is what the host actually builds from.
-            pad = GamepadManager.shared.resolveType(setting: g)
+            pad = g
        }
        var bitrate = UInt32(clamping: bitrateKbps)
        if let kbps = ProcessInfo.processInfo.environment["PUNKTFUNK_BITRATE_KBPS"],
@@ -1,97 +0,0 @@
-// Keeps the local display awake for the duration of a streaming session.
-//
-// A stream is not "user activity" to the OS: the pixels arrive over the network and the input that
-// drives them is often a game controller, which does NOT feed the HID idle timer on any Apple
-// platform. So a controller-only session reliably idles the panel out from under the user — the
-// same reason the Android client holds FLAG_KEEP_SCREEN_ON while streaming (StreamScreen.kt).
-//
-// Held by SessionModel from `beginStreaming` to `disconnect`, so it is scoped to the session and
-// never leaks past it (including a host-ended or timed-out background session, which both land in
-// `disconnect`).
-
-import Foundation
-
-#if os(macOS)
-    import IOKit.pwr_mgt
-#else
-    import UIKit
-#endif
-
-@MainActor
-final class DisplaySleepGuard {
-    #if os(macOS)
-        /// The `beginActivity` token; non-nil exactly while held.
-        private var activity: NSObjectProtocol?
-        /// Re-used across heartbeats so the whole session shares one assertion instead of
-        /// accumulating one per tick.
-        private var userActivityAssertion: IOPMAssertionID = IOPMAssertionID(0)
-        private var heartbeat: Timer?
-
-        /// The power assertion defers DISPLAY SLEEP but not the screen saver — that runs off the
-        /// HID idle timer, which a controller-only session never touches. Declaring user activity
-        /// on an interval well under the shortest selectable screen-saver delay (1 minute) keeps
-        /// that timer from ever reaching it. Side effect, and the intended one: an idle-lock
-        /// configured to follow the screen saver is deferred too, for the session only.
-        private static let heartbeatInterval: TimeInterval = 30
-    #endif
-
-    private(set) var isHeld = false
-
-    /// Idempotent — a second acquire while held is a no-op.
-    func acquire() {
-        guard !isHeld else { return }
-        isHeld = true
-        #if os(macOS)
-            // The high-level Foundation API over IOKit power assertions: `.idleDisplaySleepDisabled`
-            // is the panel, `.userInitiated` also holds off idle SYSTEM sleep and sudden termination
-            // for a session the user is watching in real time.
-            activity = ProcessInfo.processInfo.beginActivity(
-                options: [.userInitiated, .idleDisplaySleepDisabled],
-                reason: "Punktfunk streaming session")
-            declareUserActivity()
-            let timer = Timer.scheduledTimer(withTimeInterval: Self.heartbeatInterval, repeats: true) {
-                [weak self] _ in
-                MainActor.assumeIsolated { self?.declareUserActivity() }
-            }
-            // The stream runs under a tracking run-loop mode while a menu or a window resize is up;
-            // .common keeps the heartbeat ticking through those.
-            RunLoop.main.add(timer, forMode: .common)
-            heartbeat = timer
-        #else
-            // iOS/iPadOS/tvOS: app-wide, and ignored while backgrounded — the background keep-alive
-            // (audio-only, video dropped) correctly lets the device sleep without touching this.
-            UIApplication.shared.isIdleTimerDisabled = true
-        #endif
-    }
-
-    /// Idempotent — safe to call when not held (`disconnect` runs on paths that never streamed).
-    func release() {
-        guard isHeld else { return }
-        isHeld = false
-        #if os(macOS)
-            heartbeat?.invalidate()
-            heartbeat = nil
-            if let activity {
-                ProcessInfo.processInfo.endActivity(activity)
-                self.activity = nil
-            }
-            if userActivityAssertion != IOPMAssertionID(0) {
-                IOPMAssertionRelease(userActivityAssertion)
-                userActivityAssertion = IOPMAssertionID(0)
-            }
-        #else
-            UIApplication.shared.isIdleTimerDisabled = false
-        #endif
-    }
-
-    #if os(macOS)
-        /// Resets the HID idle timer (see `heartbeatInterval`). `kIOPMUserActiveLocal` = activity at
-        /// this Mac's own display, which is what a stream being watched here is.
-        private func declareUserActivity() {
-            IOPMAssertionDeclareUserActivity(
-                "Punktfunk streaming session" as CFString,
-                kIOPMUserActiveLocal,
-                &userActivityAssertion)
-        }
-    #endif
-}
@@ -196,11 +196,6 @@ final class SessionModel: ObservableObject {
    /// Bounded auto-disconnect for a backgrounded keep-alive session. Fires on `.main`.
    private var backgroundTimer: DispatchSourceTimer?

-    /// Holds off display sleep (and, on macOS, the screen saver) for the life of a session —
-    /// nothing about watching a stream looks like user activity to the OS, least of all a
-    /// controller-only session. Acquired in `beginStreaming`, released in `disconnect`.
-    private let displaySleepGuard = DisplaySleepGuard()
-
    /// `allowTofu` gates the trust-on-first-use prompt for an unpinned host: it is only true
    /// when the host EXPLICITLY advertised `pair=optional` (rule 3a). For any other unpinned host
    /// — `pair=required`, a manually-typed host, or a discovered host with no/unknown `pair`
@@ -307,26 +302,13 @@ final class SessionModel: ObservableObject {
            if preferredCodec == PunktfunkConnection.codecPyroWave, MetalWaveletDecoder.supported {
                videoCodecs |= PunktfunkConnection.codecPyroWave
            }
-            // Cursor channel (remote-desktop-sweep M2, macOS): sessions STARTING in the desktop
-            // mouse model advertise local cursor rendering — the host then stops compositing
-            // the pointer and forwards shape/state, which StreamView draws as the real
-            // NSCursor. Capture-mode sessions keep today's composited pointer.
-            #if os(macOS)
-            let clientCaps: UInt8 =
-                (MouseInputMode(
-                    rawValue: UserDefaults.standard.string(forKey: DefaultsKey.mouseMode) ?? "")
-                    ?? .capture) == .desktop ? 0x01 : 0
-            #else
-            let clientCaps: UInt8 = 0
-            #endif
            let result = Result { try PunktfunkConnection(
                host: host.address, port: host.port,
                width: width, height: height, refreshHz: hz,
                pinSHA256: pin, identity: identity, compositor: compositor,
                gamepad: gamepad, bitrateKbps: bitrateKbps, videoCaps: videoCaps,
                audioChannels: audioChannels,
-                videoCodecs: videoCodecs, preferredCodec: preferredCodec,
-                clientCaps: clientCaps, launchID: launchID,
+                videoCodecs: videoCodecs, preferredCodec: preferredCodec, launchID: launchID,
                // Delegated approval: the host holds this connect open until the operator approves
                // it (~180 s) — outwait that window so a slow approval still lands here. Normal
                // connects keep the snappy default.
@@ -460,8 +442,6 @@ final class SessionModel: ObservableObject {
    func disconnect(deliberate: Bool = true) {
        statsTimer?.invalidate()
        statsTimer = nil
-        // No-op when this session never reached `.streaming` (a refused/aborted connect).
-        displaySleepGuard.release()
        // Drop any armed background keep-alive (incl. the timeout that just fired us).
        backgroundTimer?.cancel()
        backgroundTimer = nil
@@ -557,7 +537,6 @@ final class SessionModel: ObservableObject {
        // Input capture itself is owned by StreamView (engaged by the captureEnabled
        // flip this phase change causes, released/re-engaged by the user from there).
        phase = .streaming
-        displaySleepGuard.acquire()
        // Audio starts with streaming, not during the trust prompt — no host sound (or
        // mic uplink!) before the user trusted the host. Devices come from Settings;
        // "" = system default.
@@ -221,9 +221,6 @@ public final class PunktfunkConnection {
    /// core). The clip *sends* (`clipControl`/`clipOffer`/`clipServe`…) share this lock too:
    /// they're quick non-blocking enqueues, and a single lock keeps close() ordering simple.
    private let clipboardLock = NSLock()
-    /// Serializes the (single) cursor pull thread against close() — both cursor planes are
-    /// drained by ONE thread, so one lock covers them.
-    private let cursorLock = NSLock()

    /// Negotiated session mode (host-confirmed).
    public private(set) var width: UInt32 = 0
@@ -384,106 +381,6 @@ public final class PunktfunkConnection {
    public var hostSupportsClipboard: Bool {
        hostCaps & UInt8(PUNKTFUNK_HOST_CAP_CLIPBOARD) != 0
    }
-
-    /// The host answered `HOST_CAP_CURSOR`: it stopped compositing the pointer and forwards
-    /// shape/state on the cursor planes — the client MUST draw the cursor locally.
-    /// `0x08` — the bit moved when `HOST_CAP_TEXT_INPUT` claimed `0x04` on main; testing the
-    /// old bit would mistake a text-input-capable host (e.g. Windows) for a cursor grant.
-    public var hostSupportsCursor: Bool {
-        hostCaps & 0x08 != 0
-    }
-
-    /// The host injects full-fidelity stylus input (`HOST_CAP_PEN`) — the gate for splitting
-    /// Apple Pencil out of the touch path onto the pen plane (``sendPen(_:)``).
-    public var hostSupportsPen: Bool {
-        hostCaps & UInt8(PUNKTFUNK_HOST_CAP_PEN) != 0
-    }
-
-    /// One forwarded host-cursor shape (the cursor channel, ABI v11): straight-alpha RGBA,
-    /// `rgba.count == width * height * 4`, hotspot within the bitmap. Cache by `serial` —
-    /// states reference shapes by it and a re-shown serial never resends pixels.
-    public struct CursorShapeEvent: Sendable {
-        public let serial: UInt32
-        public let width: Int
-        public let height: Int
-        public let hotX: Int
-        public let hotY: Int
-        public let rgba: Data
-    }
-
-    /// Per-host-tick cursor state: position (host video px, the pointer/hotspot point),
-    /// visibility, and the host-driven relative-mode hint (an app grabbed/hid the pointer ⇒
-    /// run captured relative; clear ⇒ absolute, reappearing at `x`/`y`). Latest-wins.
-    public struct CursorStateEvent: Sendable {
-        public let serial: UInt32
-        public let visible: Bool
-        public let relativeHint: Bool
-        public let x: Int32
-        public let y: Int32
-    }
-
-    /// Pull the next forwarded cursor SHAPE (nil = timeout). Only a session connected with
-    /// `clientCaps` cursor bit against a `hostSupportsCursor` host receives any. Drain shape
-    /// AND state from ONE dedicated cursor thread (they share a lock).
-    public func nextCursorShape(timeoutMs: UInt32 = 0) throws -> CursorShapeEvent? {
-        cursorLock.lock()
-        defer { cursorLock.unlock() }
-        guard let h = liveHandle() else { throw PunktfunkClientError.closed }
-        var out = PunktfunkCursorShape()
-        let rc = punktfunk_connection_next_cursor_shape(h, &out, timeoutMs)
-        switch rc {
-        case statusOK:
-            // Copy out of the ABI borrow (valid until the next shape call) immediately.
-            let bytes = out.rgba.map { Data(bytes: $0, count: Int(out.len)) } ?? Data()
-            return CursorShapeEvent(
-                serial: out.serial, width: Int(out.w), height: Int(out.h),
-                hotX: Int(out.hot_x), hotY: Int(out.hot_y), rgba: bytes)
-        case statusNoFrame:
-            return nil
-        case statusClosed:
-            throw PunktfunkClientError.closed
-        default:
-            throw PunktfunkClientError.status(rc)
-        }
-    }
-
-    /// Pull the next cursor STATE (nil = timeout). Latest-wins — drain the queue and apply
-    /// only the newest. Same thread + gate as [`nextCursorShape`].
-    public func nextCursorState(timeoutMs: UInt32 = 0) throws -> CursorStateEvent? {
-        cursorLock.lock()
-        defer { cursorLock.unlock() }
-        guard let h = liveHandle() else { throw PunktfunkClientError.closed }
-        var out = PunktfunkCursorState()
-        let rc = punktfunk_connection_next_cursor_state(h, &out, timeoutMs)
-        switch rc {
-        case statusOK:
-            return CursorStateEvent(
-                serial: out.serial,
-                visible: out.flags & 0x01 != 0,
-                relativeHint: out.flags & 0x02 != 0,
-                x: out.x, y: out.y)
-        case statusNoFrame:
-            return nil
-        case statusClosed:
-            throw PunktfunkClientError.closed
-        default:
-            throw PunktfunkClientError.status(rc)
-        }
-    }
-
-    /// Tell the host who renders the pointer (the §8 mid-stream mouse-model flip, ABI v12):
-    /// `clientDraws = true` — this client draws it locally (the desktop mouse model; the host
-    /// excludes the pointer from the video and forwards shape/state); `false` — the host
-    /// composites it into the video (the capture model, full fidelity). Idempotent,
-    /// latest-wins; harmless against hosts without the cursor cap. Fire-and-forget — errors
-    /// are swallowed (a closed session is the only failure and it moots the flip).
-    public func setCursorRender(clientDraws: Bool) {
-        cursorLock.lock()
-        defer { cursorLock.unlock() }
-        guard let h = liveHandle() else { return }
-        _ = punktfunk_connection_set_cursor_render(h, clientDraws)
-    }
-
    /// The resolved codec as a `VideoCodec` (H.264 / HEVC / AV1) — drives the bitstream framing
    /// (Annex-B NAL parsing vs the AV1 OBU repack).
    public var videoCodec: VideoCodec { VideoCodec(wire: resolvedCodec) }
@@ -520,7 +417,6 @@ public final class PunktfunkConnection {
        audioChannels: UInt8 = 2,
        videoCodecs: UInt8 = 0x02, // PUNKTFUNK_CODEC_HEVC — the codecs this client can decode
        preferredCodec: UInt8 = 0, // 0 = auto; else PUNKTFUNK_CODEC_* soft preference
-        clientCaps: UInt8 = 0, // ABI v11: PUNKTFUNK_CLIENT_CAP_CURSOR = render the host cursor locally
        launchID: String? = nil,
        timeoutMs: UInt32 = 10_000
    ) throws {
@@ -540,18 +436,18 @@ public final class PunktfunkConnection {
                    withOptionalCString(launchID) { launch in
                        if let pin = pinSHA256 {
                            return pin.withUnsafeBytes { p in
-                                punktfunk_connect_ex9(
+                                punktfunk_connect_ex8(
                                    cs, port, width, height, refreshHz, compositor.rawValue,
                                    gamepad.rawValue, bitrateKbps, videoCaps, audioChannels,
-                                    videoCodecs, preferredCodec, clientCaps, launch,
+                                    videoCodecs, preferredCodec, launch,
                                    p.bindMemory(to: UInt8.self).baseAddress, &observed,
                                    cert, key, timeoutMs, &connectStatus)
                            }
                        }
-                        return punktfunk_connect_ex9(
+                        return punktfunk_connect_ex8(
                            cs, port, width, height, refreshHz, compositor.rawValue,
                            gamepad.rawValue, bitrateKbps, videoCaps, audioChannels,
-                            videoCodecs, preferredCodec, clientCaps, launch,
+                            videoCodecs, preferredCodec, launch,
                            nil, &observed, cert, key, timeoutMs, &connectStatus)
                    }
                }
@@ -1141,19 +1037,6 @@ public final class PunktfunkConnection {
        _ = punktfunk_connection_send_input(h, &ev)
    }

-    /// Send one stylus sample batch (≤ `PUNKTFUNK_PEN_BATCH_MAX`, oldest first) on the pen
-    /// plane. Gate on ``hostSupportsPen`` — the core refuses toward a host without the cap.
-    /// Thread-safe; silently dropped after close (input is lossy by design).
-    public func sendPen(_ samples: [PunktfunkPenSample]) {
-        guard !samples.isEmpty else { return }
-        abiLock.lock()
-        defer { abiLock.unlock() }
-        guard let h = handle, !closeRequested else { return }
-        samples.withUnsafeBufferPointer { buf in
-            _ = punktfunk_connection_send_pen(h, buf.baseAddress, UInt32(buf.count))
-        }
-    }
-
    /// Signal a **deliberate** user-initiated quit before ``close()``: the connection closes with
    /// `QUIT_CLOSE_CODE` (81) so the host tears the session down immediately instead of holding the
    /// keep-alive linger for a reconnect. Call only from an explicit "Disconnect" action — NOT from a
@@ -1176,12 +1059,10 @@ public final class PunktfunkConnection {
        feedbackLock.lock()
        statsLock.lock()
        clipboardLock.lock()
-        cursorLock.lock()
        abiLock.lock()
        let h = handle
        handle = nil
        abiLock.unlock()
-        cursorLock.unlock()
        clipboardLock.unlock()
        statsLock.unlock()
        feedbackLock.unlock()
@@ -55,13 +55,7 @@ public final class GamepadCapture {
        /// Wire pad index (GamepadManager's stable lowest-free assignment), threaded onto every
        /// event this controller sends — the low byte of `flags`.
        let pad: UInt32
-        /// The controller KIND declared to the host (GamepadArrival) when the slot opened — the
-        /// user's explicit "Controller type" setting when they picked one, else the detected
-        /// kind (`GamepadManager.declaredKind(for:)`). NOT the physical pad's kind: local feedback
-        /// keys off the live `GCController` subclass instead, so whatever the host DOES send is
-        /// applied natively to the pad in the user's hands. What the host sends is bounded by the
-        /// emulated type, though — a virtual DualShock 4 has no adaptive-trigger reports in its
-        /// protocol, so emulating one gives those up by construction (rumble + lightbar remain).
+        /// The controller KIND declared to the host (GamepadArrival) when the slot opened.
        let pref: PunktfunkConnection.GamepadType
        var buttons: UInt32 = 0
        var axes: [Int32] = [0, 0, 0, 0, 0, 0]
@@ -172,7 +166,7 @@ public final class GamepadCapture {
    private func openSlot(_ dc: GamepadManager.DiscoveredController) {
        guard let pad = manager.padIndex(for: dc), let ext = dc.controller.extendedGamepad else { return }
        let c = dc.controller
-        let slot = Slot(controller: c, pad: UInt32(pad), pref: manager.declaredKind(for: dc))
+        let slot = Slot(controller: c, pad: UInt32(pad), pref: dc.kind)
        slots.append(slot)

        ext.valueChangedHandler = { [weak self, weak slot] g, _ in
@@ -198,12 +192,9 @@ public final class GamepadCapture {
            }
        }
        // Declare this pad's controller KIND before any of its input, so the host builds a
-        // matching virtual device — the user's chosen type when they picked one, else per-pad
-        // detection (mixed types — pad 0 a DualSense, pad 1 an Xbox pad). This declaration is
-        // what the host actually builds from, so it MUST carry an explicit setting; the
-        // handshake's session default is only the fallback for a pad that never declares. The
-        // core re-sends it a few times against datagram loss; an older host ignores it and uses
-        // the session-default kind. Then wake the host pad (pads are created lazily from the first
+        // matching virtual device (mixed types — pad 0 a DualSense, pad 1 an Xbox pad). The core
+        // re-sends it a few times against datagram loss; an older host ignores it and uses the
+        // session-default kind. Then wake the host pad (pads are created lazily from the first
        // event; a DualSense's UHID handshake + initial lightbar write only start then).
        connection.send(.gamepadArrival(pref: slot.pref.rawValue, pad: slot.pad))
        connection.send(.gamepadAxis(GamepadWire.axisLSX, value: 0, pad: slot.pad))
@@ -131,40 +131,13 @@ public final class GamepadManager: ObservableObject {
        GCController.stopWirelessControllerDiscovery()
    }

-    /// The user's controller-type choice AS CHOSEN (not resolved) for the session being dialed —
-    /// adopted by `resolveType` and read back by `declaredKind(for:)`. `.auto` = detect per pad.
-    public private(set) var typeSetting: PunktfunkConnection.GamepadType = .auto
-
-    /// The kind to DECLARE to the host for one forwarded controller (its `GamepadArrival`).
-    /// An explicit setting wins for every pad — the handshake's session default alone does NOT
-    /// stick, because a current host honors the per-pad arrival over it (punktfunk-host's
-    /// `Pads::set_kind`), so a client that declared only the detected kind here would silently
-    /// undo the user's choice. `.auto` keeps per-pad detection, which is what makes a mixed
-    /// session (pad 0 a DualSense, pad 1 an Xbox pad) honest.
-    public func declaredKind(
-        for controller: DiscoveredController
-    ) -> PunktfunkConnection.GamepadType {
-        Self.declaredKind(setting: typeSetting, detected: controller.kind)
-    }
-
-    /// The pure fold behind `declaredKind(for:)` (pf-client-core's `declared_kind`).
-    nonisolated static func declaredKind(
-        setting: PunktfunkConnection.GamepadType,
-        detected: PunktfunkConnection.GamepadType
-    ) -> PunktfunkConnection.GamepadType {
-        setting == .auto ? detected : setting
-    }
-
    /// Connect-time resolution of the user's controller-type setting: an explicit choice
    /// wins; `.auto` matches the virtual pad to the active physical controller (DualSense →
    /// DualSense, DualShock 4 → DualShock 4, an Xbox pad → Xbox One, anything else → Xbox
-    /// 360); no controller at all defers to the host. Called once per dial with the RAW setting,
-    /// which it also adopts for `declaredKind(for:)` so the handshake default and every pad's
-    /// arrival can never disagree about an explicit choice.
+    /// 360); no controller at all defers to the host.
    public func resolveType(
        setting: PunktfunkConnection.GamepadType
    ) -> PunktfunkConnection.GamepadType {
-        typeSetting = setting
        guard setting == .auto else { return setting }
        // Refresh from the LIVE controller list first. `active` is otherwise only populated by the
        // async `.GCControllerDidConnect` notification, so at connect time it can still be nil even
@@ -1,268 +0,0 @@
-// Apple Pencil → state-full wire pen samples (design/pen-tablet-input.md §7).
-//
-// Every sample carries the COMPLETE pen state (in-range/touching/buttons + all axes) — the
-// host diffs consecutive samples and synthesizes down/up/button transitions itself, so a lost
-// datagram self-heals and this file never sends edge events. Three sources feed one stream:
-// UITouch contacts (with coalesced samples for full 240 Hz fidelity), the hover gesture
-// (zOffset > 0 distinguishes a hovering Pencil from a trackpad pointer), and
-// UIPencilInteraction (squeeze held → barrel 1, double-tap → a momentary barrel 2 —
-// Apple Pencil has no hardware eraser end or barrel buttons, so these mappings are how
-// host-side apps get their stylus button/eraser affordances).
-//
-// HEARTBEAT (wire contract — see `PunktfunkPenSample` in punktfunk_core.h): while the pen is
-// in range or touching, the last sample repeats every ≤100 ms even when nothing changed.
-// UIKit is silent for a stationary Pencil, and the host force-releases the stroke after
-// 200 ms without samples (its dead-client failsafe) — the timer keeps a held stroke alive.
-
-#if os(iOS)
-import PunktfunkCore
-import UIKit
-
-final class PencilStream: NSObject, UIPencilInteractionDelegate {
-    enum Phase { case down, move, up, cancel }
-
-    /// One assembled batch (≤ `PUNKTFUNK_PEN_BATCH_MAX` samples) ready for the connection.
-    var send: (([PunktfunkPenSample]) -> Void)?
-    /// View-space point → normalized [0,1] video coordinates (the letterbox mapping the
-    /// touch path already uses). nil until a mode is negotiated — samples are dropped then.
-    var videoNorm: ((CGPoint) -> (Float, Float)?)?
-
-    private var inRange = false
-    private var touching = false
-    /// Squeeze held (mapped to wire BARREL1).
-    private var squeezeHeld = false
-    /// Whether this device/Pencil pair has demonstrated hover — decides what a lift means:
-    /// hover-capable hardware keeps proximity (the hover recognizer owns the exit), anything
-    /// else leaves range on lift so the host never parks a phantom hovering pen.
-    private var sawHover = false
-    /// A hover gesture is live right now (routes ended-state hover callbacks to us even when
-    /// the recognizer's final zOffset reads 0).
-    private(set) var hoverActive = false
-    private var last = PencilStream.idleSample()
-    private var heartbeat: Timer?
-
-    // MARK: - Contact path (UITouch, `.pencil` only)
-
-    func touches(_ touches: Set<UITouch>, event: UIEvent?, phase: Phase, in view: UIView) {
-        // At most one Pencil exists; a set with several is UIKit batching phases of the same
-        // stylus — the last one carries the freshest state.
-        guard let touch = touches.max(by: { $0.timestamp < $1.timestamp }) else { return }
-        switch phase {
-        case .down, .move:
-            touching = true
-            inRange = true
-            // Coalesced samples restore the Pencil's full capture rate (UIKit delivers at
-            // display cadence); oldest first, `dt_us` preserving their spacing.
-            let raw = event?.coalescedTouches(for: touch) ?? [touch]
-            var batch: [PunktfunkPenSample] = []
-            var prevTs: TimeInterval?
-            for t in raw.suffix(Int(PUNKTFUNK_PEN_BATCH_MAX)) {
-                guard let s = contactSample(t, in: view, prevTs: prevTs) else { continue }
-                prevTs = t.timestamp
-                batch.append(s)
-            }
-            emit(batch)
-        case .up:
-            touching = false
-            // Hover-capable hardware: lift back to hover, the recognizer exits range later.
-            // Otherwise a lift IS the range exit (mirror of the host's GameStream heuristic).
-            inRange = sawHover
-            var s = last
-            s.pressure = 0
-            s.state = stateBits()
-            if let posSample = contactSample(touch, in: view, prevTs: nil) {
-                s.x = posSample.x
-                s.y = posSample.y
-            }
-            emit([s])
-        case .cancel:
-            release()
-        }
-    }
-
-    // MARK: - Hover path (forwarded from the view's hover recognizer)
-
-    /// Returns whether the event was consumed as Pencil hover; `false` hands it back to the
-    /// pointer path. A hovering Pencil reports `zOffset > 0`; trackpad/mouse hover is 0.
-    func maybeHover(_ r: UIHoverGestureRecognizer, in view: UIView) -> Bool {
-        switch r.state {
-        case .began, .changed:
-            guard r.zOffset > 0 || hoverActive else { return false }
-            hoverActive = true
-            sawHover = true
-            inRange = true
-            touching = false
-            guard let (x, y) = videoNorm?(r.location(in: view)) else { return true }
-            var s = PencilStream.idleSample()
-            s.state = stateBits()
-            s.x = x
-            s.y = y
-            s.distance = UInt16((r.zOffset.clamped(to: 0...1) * 65534).rounded())
-            s.tilt_deg = Self.tiltDeg(altitude: r.altitudeAngle)
-            s.azimuth_deg = Self.azimuthDeg(r.azimuthAngle(in: view))
-            if #available(iOS 17.5, *) { s.roll_deg = Self.rollDeg(r.rollAngle) }
-            emit([s])
-            return true
-        case .ended, .cancelled, .failed:
-            guard hoverActive else { return false }
-            hoverActive = false
-            if !touching { release() }
-            return true
-        default:
-            return hoverActive
-        }
-    }
-
-    // MARK: - UIPencilInteractionDelegate (squeeze → barrel 1 held, tap → barrel 2 click)
-
-    @available(iOS 17.5, *)
-    func pencilInteraction(
-        _ interaction: UIPencilInteraction, didReceiveSqueeze squeeze: UIPencilInteraction.Squeeze
-    ) {
-        switch squeeze.phase {
-        case .began:
-            squeezeHeld = true
-        case .ended, .cancelled:
-            squeezeHeld = false
-        default:
-            return
-        }
-        guard inRange || touching else { return }
-        var s = last
-        s.state = stateBits()
-        emit([s])
-    }
-
-    func pencilInteractionDidTap(_ interaction: UIPencilInteraction) {
-        guard inRange || touching else { return }
-        // A momentary barrel-2 click: press + release as two state-full samples in ONE batch
-        // — the host's tracker emits the button press and release in order.
-        var press = last
-        press.state = stateBits() | UInt8(PUNKTFUNK_PEN_BARREL2)
-        var releaseS = last
-        releaseS.state = stateBits()
-        emit([press, releaseS])
-    }
-
-    // MARK: - Lifecycle
-
-    /// Session stop / view teardown: leave range so the host lifts anything held.
-    func reset() {
-        if inRange || touching { release() }
-        sawHover = false
-        hoverActive = false
-        squeezeHeld = false
-    }
-
-    private func release() {
-        touching = false
-        inRange = false
-        var s = last
-        s.pressure = 0
-        s.state = 0
-        emit([s])
-    }
-
-    // MARK: - Sample assembly
-
-    private func contactSample(
-        _ t: UITouch, in view: UIView, prevTs: TimeInterval?
-    ) -> PunktfunkPenSample? {
-        guard let (x, y) = videoNorm?(t.location(in: view)) else { return nil }
-        var s = PencilStream.idleSample()
-        s.state = stateBits()
-        s.x = x
-        s.y = y
-        // maximumPossibleForce is 0 until the system knows the stylus — full force then
-        // (binary-stylus semantics, matching the host's unknown-pressure rule).
-        let maxForce = t.maximumPossibleForce
-        s.pressure =
-            maxForce > 0
-            ? UInt16((Double(t.force / maxForce).clamped(to: 0...1) * 65535).rounded())
-            : UInt16.max
-        s.distance = 0
-        s.tilt_deg = Self.tiltDeg(altitude: t.altitudeAngle)
-        s.azimuth_deg = Self.azimuthDeg(t.azimuthAngle(in: view))
-        if #available(iOS 17.5, *) { s.roll_deg = Self.rollDeg(t.rollAngle) }
-        if let prevTs {
-            s.dt_us = UInt16(((t.timestamp - prevTs) * 1_000_000).clamped(to: 0...65535))
-        }
-        return s
-    }
-
-    private func stateBits() -> UInt8 {
-        var bits: UInt8 = 0
-        if inRange || touching { bits |= UInt8(PUNKTFUNK_PEN_IN_RANGE) }
-        if touching { bits |= UInt8(PUNKTFUNK_PEN_TOUCHING) }
-        if squeezeHeld { bits |= UInt8(PUNKTFUNK_PEN_BARREL1) }
-        return bits
-    }
-
-    private func emit(_ batch: [PunktfunkPenSample]) {
-        guard !batch.isEmpty else { return }
-        last = batch[batch.count - 1]
-        last.dt_us = 0
-        send?(batch)
-        armHeartbeat()
-    }
-
-    /// The ≤100 ms keepalive while in range (see the file header). 80 ms leaves headroom
-    /// under the host's 200 ms failsafe even with one lost datagram.
-    private func armHeartbeat() {
-        heartbeat?.invalidate()
-        guard inRange || touching else {
-            heartbeat = nil
-            return
-        }
-        heartbeat = Timer.scheduledTimer(withTimeInterval: 0.08, repeats: true) {
-            [weak self] _ in
-            guard let self, self.inRange || self.touching else {
-                self?.heartbeat?.invalidate()
-                self?.heartbeat = nil
-                return
-            }
-            self.send?([self.last])
-        }
-    }
-
-    // MARK: - Angle conversions
-
-    /// Altitude (π/2 = perpendicular) → wire tilt-from-normal in degrees, 0...90.
-    private static func tiltDeg(altitude: CGFloat) -> UInt8 {
-        UInt8((90 - altitude * 180 / .pi).rounded().clamped(to: 0...90))
-    }
-
-    /// Apple azimuth (0 along the view's +x axis, clockwise, y-down) → wire azimuth
-    /// (0 = north/up on screen, clockwise): +90° offset.
-    private static func azimuthDeg(_ apple: CGFloat) -> UInt16 {
-        let deg = (apple * 180 / .pi + 90).truncatingRemainder(dividingBy: 360)
-        return UInt16((deg + 360).truncatingRemainder(dividingBy: 360).rounded()) % 360
-    }
-
-    /// Pencil Pro roll (radians, −π...π) → wire barrel roll 0...359°.
-    private static func rollDeg(_ roll: CGFloat) -> UInt16 {
-        let deg = (roll * 180 / .pi).truncatingRemainder(dividingBy: 360)
-        return UInt16(((deg + 360).truncatingRemainder(dividingBy: 360)).rounded()) % 360
-    }
-
-    /// All-unknown baseline: sentinel angles/distance, tool = pen (the eraser is host-side
-    /// state driven by the squeeze/tap mappings, not a hardware end).
-    private static func idleSample() -> PunktfunkPenSample {
-        PunktfunkPenSample(
-            x: 0, y: 0, pressure: 0,
-            distance: UInt16(PUNKTFUNK_PEN_DISTANCE_UNKNOWN),
-            azimuth_deg: UInt16(PUNKTFUNK_PEN_ANGLE_UNKNOWN),
-            roll_deg: UInt16(PUNKTFUNK_PEN_ANGLE_UNKNOWN),
-            dt_us: 0, state: 0,
-            tool: UInt8(PUNKTFUNK_PEN_TOOL_PEN),
-            tilt_deg: UInt8(PUNKTFUNK_PEN_TILT_UNKNOWN),
-            _reserved: (0, 0, 0))
-    }
-}
-
-extension Comparable {
-    fileprivate func clamped(to range: ClosedRange<Self>) -> Self {
-        min(max(self, range.lowerBound), range.upperBound)
-    }
-}
-#endif
@@ -219,39 +219,6 @@ public final class StreamLayerView: NSView {
    /// flipped live by ⌃⌥⇧M. A live flip re-engages capture in the new model so
    /// disassociation + the abs/rel choice swap atomically. Main-thread only.
    private var desktopMouse = false
-    /// Cursor channel (M2): the host forwards shape/state and WE draw the pointer. Active
-    /// when the Welcome carried `HOST_CAP_CURSOR` (only sessions that advertised the client
-    /// cap get it). Shapes cache by serial; state is latest-wins. Main-thread only.
-    private var cursorChannelActive = false
-    /// A forwarded host cursor shape, cached RAW (not as a finished `NSCursor`) so the pointer can be
-    /// (re)built at the CURRENT video-fit scale — see `scaledCursor`. The host forwards the bitmap in
-    /// host FRAMEBUFFER pixels, whose size tracks the host's display scaling (32 px at 100%, 96 px at
-    /// 300% DPI); scaling by the video fit keeps the pointer sized to the streamed desktop at any host
-    /// scaling instead of ballooning on a high-DPI host.
-    private struct HostCursorShape {
-        let cg: CGImage
-        let width: Int
-        let height: Int
-        let hotX: Int
-        let hotY: Int
-    }
-    private var hostCursors: [UInt32: HostCursorShape] = [:]
-    /// The last shape actually worn. State (`0xD0`, a per-frame datagram) announces a new serial the
-    /// moment the host QUEUES its bitmap on the reliable control stream, so the client routinely
-    /// knows a serial before it holds the pixels — and the shape ring drops the NEWEST under burst
-    /// (`CURSOR_SHAPE_QUEUE`), which the host never re-sends because it only sends on a serial
-    /// CHANGE. Both leave `hostCursors[serial]` empty; wearing the previous pointer through that
-    /// gap degrades it to a briefly-stale shape instead of blinking the pointer out of existence.
-    private var lastWornShape: HostCursorShape?
-    private var cursorState: PunktfunkConnection.CursorStateEvent?
-    /// Last `CursorRenderMode.clientDraws` told to the host (the §8 mid-stream render flip);
-    /// nil = nothing sent yet. Edge-detected by [`reconcileCursorRender`] from the live mouse
-    /// model, so the chord, engage/release, and session start all reconcile through one path.
-    private var sentClientDraws: Bool?
-    /// M3 hint tracking: edge-triggered so a manual ⌃⌥⇧M isn't fought — the override latch
-    /// holds until the HOST's intent next changes.
-    private var lastHint: Bool?
-    private var hintOverride = false
    /// One-shot auto-engage request (stream start, trust confirmed) — attempted as soon
    /// as the view is in a window with real bounds, then dropped, so it can never fire
    /// surprisingly later (e.g. on a resize).
@@ -489,7 +456,6 @@ public final class StreamLayerView: NSView {
        window?.makeFirstResponder(self)
        window?.invalidateCursorRects(for: self) // desktop model: hide-over-view engages
        notifyCaptureChange(true)
-        reconcileCursorRender()
    }

    private func releaseCapture() {
@@ -500,7 +466,6 @@ public final class StreamLayerView: NSView {
        captured = false
        window?.invalidateCursorRects(for: self)
        notifyCaptureChange(false)
-        reconcileCursorRender() // released ⇒ the host composites the pointer again
    }

    /// A fully transparent cursor for the desktop mouse model's hide-over-view rect —
@@ -515,190 +480,12 @@ public final class StreamLayerView: NSView {
    /// globally via `CursorCapture` (the pointer can't leave the view there).
    override public func resetCursorRects() {
        if captured && desktopMouse {
-            // Cursor channel active: wear the HOST's pointer shape (it is no longer in the
-            // video); a HIDDEN host pointer (or nothing seen yet at all) = invisible. Without the
-            // channel, M1 behavior: invisible local cursor, the composited host cursor is the
-            // visible one.
-            //
-            // A visible pointer whose announced serial has no bitmap yet falls back to the last
-            // worn shape (see `lastWornShape`) rather than to `invisibleCursor`. That case is
-            // routine, not degenerate — state outruns its bitmap on every single shape change —
-            // and treating it as "hide the pointer" made the pointer VANISH over anything whose
-            // shape arrived late or got dropped, with no recovery until the next change. Only
-            // `st.visible == false` may hide the pointer; a missing bitmap may not.
-            if cursorChannelActive, let st = cursorState, st.visible,
-               let shape = hostCursors[st.serial] ?? lastWornShape {
-                lastWornShape = shape
-                addCursorRect(bounds, cursor: scaledCursor(shape))
-            } else {
-                addCursorRect(bounds, cursor: Self.invisibleCursor)
-            }
+            addCursorRect(bounds, cursor: Self.invisibleCursor)
        } else {
            super.resetCursorRects()
        }
    }

-    /// Tell the host who renders the pointer (the §8 mid-stream render flip): we draw it only
-    /// while the DESKTOP model is engaged (the local OS cursor wears the host shape); under
-    /// the capture model — and while released — the host composites it into the video (full
-    /// fidelity, the pre-channel look). One edge-detected reconciler, called from every
-    /// transition (chord, engage/release, session start).
-    private func reconcileCursorRender() {
-        guard cursorChannelActive, let connection else { return }
-        let clientDraws = captured && desktopMouse
-        guard sentClientDraws != clientDraws else { return }
-        sentClientDraws = clientDraws
-        connection.setCursorRender(clientDraws: clientDraws)
-    }
-
-    /// Flip the mouse model with the atomic release/re-engage swap; `reappearAt` (host video
-    /// px — the M3 hand-back position) warps the local pointer so leaving relative lands the
-    /// cursor exactly where the host last had it.
-    private func setDesktopMouse(_ on: Bool, reappearAt: (x: Int32, y: Int32)?) {
-        guard desktopMouse != on else { return }
-        let wasCaptured = captured
-        if wasCaptured { releaseCapture() }
-        desktopMouse = on
-        if wasCaptured { engageCapture(fromClick: false) }
-        window?.invalidateCursorRects(for: self)
-        if on, let p = reappearAt, let sp = cgScreenPoint(forHostX: p.x, p.y) {
-            CGWarpMouseCursorPosition(sp)
-        }
-        reconcileCursorRender()
-    }
-
-    /// The single cursor pull thread (both planes share the connection's cursor lock):
-    /// latest-wins state at a short timeout + a non-blocking shape poll per iteration.
-    /// Exits when the connection closes; events hop to main where all cursor state lives.
-    private func startCursorPump(_ connection: PunktfunkConnection) {
-        let thread = Thread { [weak self] in
-            while true {
-                do {
-                    var newest: PunktfunkConnection.CursorStateEvent?
-                    if let st = try connection.nextCursorState(timeoutMs: 100) {
-                        newest = st
-                        while let more = try connection.nextCursorState(timeoutMs: 0) {
-                            newest = more // drain — latest wins
-                        }
-                    }
-                    while let shape = try connection.nextCursorShape(timeoutMs: 0) {
-                        DispatchQueue.main.async { self?.applyCursorShape(shape) }
-                    }
-                    if let st = newest {
-                        DispatchQueue.main.async { self?.applyCursorState(st) }
-                    }
-                } catch {
-                    return // connection closed — the session is over
-                }
-                if self == nil { return }
-            }
-        }
-        thread.name = "pf-cursor-pump"
-        thread.start()
-    }
-
-    private func applyCursorShape(_ ev: PunktfunkConnection.CursorShapeEvent) {
-        guard let shape = Self.makeShape(ev) else {
-            // Truthful only because `resetCursorRects` falls back to `lastWornShape`: before that,
-            // a rejection here left the announced serial with no bitmap and HID the pointer.
-            streamInputLog.warning("cursor shape rejected (\(ev.width)x\(ev.height)) — keeping the previous cursor")
-            return
-        }
-        if hostCursors.count >= 64 { hostCursors.removeAll() } // degenerate host: reset
-        hostCursors[ev.serial] = shape
-        if cursorState?.serial == ev.serial {
-            window?.invalidateCursorRects(for: self)
-        }
-    }
-
-    private func applyCursorState(_ ev: PunktfunkConnection.CursorStateEvent) {
-        let prev = cursorState
-        cursorState = ev
-        if prev?.visible != ev.visible || prev?.serial != ev.serial {
-            window?.invalidateCursorRects(for: self)
-        }
-        // M3 host-driven auto-flip is DISABLED: `relative_hint` is derived from host cursor
-        // VISIBILITY, and Windows hides the pointer for ordinary desktop activity (clicking,
-        // typing) — not just when a game grabs it. Acting on those transients flipped
-        // desktop→capture→desktop, which warped the cursor to view-centre and flushed held
-        // buttons (a spurious button-up ~200 ms into every press → broke window drags). Until
-        // the host exposes a real pointer-LOCK signal (ClipCursor/raw-input, not visibility),
-        // the mouse model is user-driven only (⌃⌥⇧M). The hint still rides the wire, unused.
-        _ = (lastHint, hintOverride)
-    }
-
-    /// Decode a forwarded straight-alpha RGBA shape into a CGImage + hotspot. The on-screen SIZE is
-    /// NOT baked in here — it is applied per-use in `scaledCursor` from the live video-fit scale, so
-    /// the same shape re-fits across window resizes / retina moves without a re-forward.
-    private static func makeShape(_ ev: PunktfunkConnection.CursorShapeEvent) -> HostCursorShape? {
-        let (w, h) = (ev.width, ev.height)
-        guard w > 0, h > 0, ev.rgba.count >= w * h * 4,
-              let provider = CGDataProvider(data: ev.rgba as CFData),
-              let cg = CGImage(
-                  width: w, height: h, bitsPerComponent: 8, bitsPerPixel: 32,
-                  bytesPerRow: w * 4, space: CGColorSpaceCreateDeviceRGB(),
-                  bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.last.rawValue),
-                  provider: provider, decode: nil, shouldInterpolate: false,
-                  intent: .defaultIntent)
-        else { return nil }
-        return HostCursorShape(
-            cg: cg, width: w, height: h,
-            hotX: min(ev.hotX, w - 1), hotY: min(ev.hotY, h - 1))
-    }
-
-    /// Points-per-host-pixel: the exact factor the video frame is aspect-fit into the view (the same
-    /// `AVMakeRect` fit `hostPoint`/`cgScreenPoint` use). The host forwards the pointer bitmap in host
-    /// framebuffer pixels — the mode we drive is in the client's BACKING pixels, so on retina this is
-    /// ~1/backingScale and the pointer lands at its TRUE size relative to the streamed desktop
-    /// (crisp, 1:1 with the video) rather than the 2×-inflated pixel-as-points it used to be. Because
-    /// the bitmap grows with the host's display scaling (96 px at 300% DPI), scaling by this is what
-    /// keeps a high-DPI host from forwarding a giant pointer. Falls back to 1 before the first
-    /// mode/layout.
-    private func cursorFitScale() -> CGFloat {
-        guard let connection else { return 1 }
-        let mode = connection.currentMode()
-        guard mode.width > 0, mode.height > 0, bounds.width > 0, bounds.height > 0 else { return 1 }
-        let fit = AVMakeRect(
-            aspectRatio: CGSize(width: Int(mode.width), height: Int(mode.height)), insideRect: bounds)
-        guard fit.width > 0 else { return 1 }
-        return fit.width / CGFloat(mode.width)
-    }
-
-    /// Build the `NSCursor` for a cached shape at the CURRENT video-fit scale (see `cursorFitScale`).
-    /// Both the image size and the hotspot scale together so the click point stays true.
-    private func scaledCursor(_ shape: HostCursorShape) -> NSCursor {
-        let scale = cursorFitScale()
-        let sw = max(1, (CGFloat(shape.width) * scale).rounded())
-        let sh = max(1, (CGFloat(shape.height) * scale).rounded())
-        let image = NSImage(cgImage: shape.cg, size: NSSize(width: sw, height: sh))
-        let hot = NSPoint(
-            x: min(CGFloat(shape.hotX) * scale, sw - 1),
-            y: min(CGFloat(shape.hotY) * scale, sh - 1))
-        return NSCursor(image: image, hotSpot: hot)
-    }
-
-    /// Host video px → CG GLOBAL screen coordinates (top-left origin, the
-    /// `CGWarpMouseCursorPosition` convention `CursorCapture` established) through the
-    /// aspect-fit letterbox — the inverse direction of `hostPoint(from:)`.
-    private func cgScreenPoint(forHostX hx: Int32, _ hy: Int32) -> CGPoint? {
-        guard let connection, let window else { return nil }
-        let mode = connection.currentMode()
-        guard mode.width > 0, mode.height > 0 else { return nil }
-        let fit = AVMakeRect(
-            aspectRatio: CGSize(width: Int(mode.width), height: Int(mode.height)),
-            insideRect: bounds)
-        guard fit.width > 0, fit.height > 0 else { return nil }
-        let u = (CGFloat(hx) / CGFloat(mode.width)).clamped(to: 0...1)
-        let v = (CGFloat(hy) / CGFloat(mode.height)).clamped(to: 0...1)
-        let videoMinYTop = bounds.height - fit.maxY
-        let pTop = CGPoint(x: fit.minX + u * fit.width, y: videoMinYTop + v * fit.height)
-        let inView = CGPoint(x: pTop.x, y: bounds.height - pTop.y)
-        let inWindow = convert(inView, to: nil)
-        let onScreen = window.convertPoint(toScreen: inWindow)
-        let primaryHeight = NSScreen.screens.first?.frame.height ?? 0
-        return CGPoint(x: onScreen.x, y: primaryHeight - onScreen.y)
-    }
-
    /// A single local monitor for motion + buttons, installed only while captured. A local
    /// monitor is more robust than view overrides for relative motion: it sidesteps the
    /// `window.acceptsMouseMovedEvents`/tracking-area/responder-chain requirements, and
@@ -860,10 +647,12 @@ public final class StreamLayerView: NSView {
                streamInputLog.info("mouse-mode chord ignored: gamescope host is relative-only")
                return
            }
-            // A manual flip outranks the standing host hint until the hint next CHANGES.
-            self.hintOverride = true
-            self.setDesktopMouse(!self.desktopMouse, reappearAt: nil)
-            streamInputLog.info("chord: mouse mode \(self.desktopMouse ? "desktop" : "capture", privacy: .public)")
+            let wasCaptured = self.captured
+            if wasCaptured { self.releaseCapture() }
+            self.desktopMouse.toggle()
+            if wasCaptured { self.engageCapture(fromClick: false) }
+            self.window?.invalidateCursorRects(for: self)
+            streamInputLog.info("mouse mode: \(self.desktopMouse ? "desktop" : "capture", privacy: .public)")
        }
        // The cross-client combos (⌃⌥⇧Q/D/S — Ctrl+Alt+Shift on the other clients), delivered by
        // the monitor only while captured; the same key-window ownership rule as ⌘⎋ throughout.
@@ -903,14 +692,6 @@ public final class StreamLayerView: NSView {
        if mode == .desktop && !absOK {
            streamInputLog.info("desktop mouse mode unavailable on a gamescope host (relative-only) — using capture")
        }
-        // Cursor channel (M2): the host stopped compositing the pointer — drain its shape/
-        // state planes and draw the pointer as the real NSCursor (plus the M3 auto-flip).
-        if connection.hostSupportsCursor {
-            cursorChannelActive = true
-            streamInputLog.info("cursor channel negotiated — host cursor renders locally")
-            startCursorPump(connection)
-            reconcileCursorRender() // initial render mode (a capture-model start composites)
-        }

        // Presenter choice + lifecycle live in SessionPresenter (shared with iOS/tvOS): stage-2
        // (explicit VTDecompressionSession decode + a CAMetalLayer/display-link present) by
@@ -970,11 +751,6 @@ public final class StreamLayerView: NSView {
            matchFollower?.noteSize(
                widthPx: Int(px.width.rounded()), heightPx: Int(px.height.rounded()))
        }
-        // The video-fit scale just changed (resize / retina move); rebuild the worn host pointer at
-        // the new scale so it tracks the video instead of freezing at its build-time size.
-        if captured, desktopMouse, cursorChannelActive {
-            window?.invalidateCursorRects(for: self)
-        }
    }

    public override func viewDidChangeBackingProperties() {
@@ -1005,14 +781,6 @@ public final class StreamLayerView: NSView {
        matchFollower = nil
        lastDecodedContentSize = nil // the next session re-derives it from its first frame
        connection = nil
-        // Cursor-channel state is per-session: without this reset a next session against a
-        // host WITHOUT the cap would wear this session's stale shapes (`cursorChannelActive`
-        // stayed latched true across sessions).
-        cursorChannelActive = false
-        cursorState = nil
-        hostCursors.removeAll()
-        sentClientDraws = nil
-        window?.invalidateCursorRects(for: self)
    }

    deinit {
@@ -333,13 +333,6 @@ public final class StreamViewController: StreamViewControllerBase {
            guard self?.captureEnabled == true else { return }
            connection?.send(event)
        }
-        // Apple Pencil → the stylus plane, only against a pen-capable host (elsewhere the
-        // Pencil stays a finger, exactly as before). Same trust gate as touch.
-        streamView.penEnabled = connection.hostSupportsPen
-        streamView.onPenBatch = { [weak self, weak connection] batch in
-            guard self?.captureEnabled == true else { return }
-            connection?.sendPen(batch)
-        }
        // Indirect pointer (mouse/trackpad) WITHOUT a lock → absolute cursor + buttons + scroll.
        // While the scene is pointer-LOCKED the GCMouse path owns motion AND buttons AND scroll, so
        // the whole UIKit indirect path is gated off here (`gcMouseForwarding`). The trackpad and a
@@ -506,8 +499,6 @@ public final class StreamViewController: StreamViewControllerBase {
        // onTouchEvent can still deliver the button-up.
        streamView.resetTouchInput()
        streamView.onTouchEvent = nil
-        streamView.onPenBatch = nil // after reset — the pen's leave-range sample rides it
-        streamView.penEnabled = false
        streamView.onPointerMoveAbs = nil
        streamView.onPointerButton = nil
        streamView.onScroll = nil
@@ -701,12 +692,6 @@ final class StreamLayerUIView: UIView {
    /// Direct fingers / Pencil → wire events: real touches in passthrough mode, or the
    /// touch-driven mouse events (`TouchMouse`) in the trackpad/pointer modes.
    var onTouchEvent: ((PunktfunkInputEvent) -> Void)?
-    /// Apple Pencil → state-full pen sample batches (the stylus plane). Active only while
-    /// `penEnabled`; without it the Pencil stays on the finger path exactly as before.
-    var onPenBatch: (([PunktfunkPenSample]) -> Void)?
-    /// The host advertised `HOST_CAP_PEN`, so Pencil input splits out of the finger path onto
-    /// the pen plane — independent of the touch-input mode (drawing must not depend on it).
-    var penEnabled = false
    /// Indirect pointer (mouse/trackpad with no lock) → absolute cursor moves.
    var onPointerMoveAbs: ((HostPoint) -> Void)?
    /// Indirect-pointer buttons (GameStream ids: 1=left 3=right); `down` = press.
@@ -730,21 +715,10 @@ final class StreamLayerUIView: UIView {
    /// The finger route latched at gesture start — a Settings change mid-gesture applies to
    /// the NEXT touch, so one gesture never splits across input models.
    private var fingerRoute: TouchInputMode?
-    /// The Apple Pencil pipeline (contacts + hover + squeeze/tap → pen samples).
-    private lazy var pencil: PencilStream = {
-        let stream = PencilStream()
-        stream.send = { [weak self] batch in self?.onPenBatch?(batch) }
-        stream.videoNorm = { [weak self] point in
-            guard let h = self?.hostPoint(from: point) else { return nil }
-            return (Float(h.x) / Float(max(h.w - 1, 1)), Float(h.y) / Float(max(h.h - 1, 1)))
-        }
-        return stream
-    }()

    /// Release anything the touch-driven mouse holds and forget gesture state — session stop.
    func resetTouchInput() {
        touchMouse.reset()
-        pencil.reset() // leaves range → the host lifts anything still inked
        fingerRoute = nil
        setSoftKeyboardVisible(false) // a stream that's gone takes its keyboard with it
    }
@@ -781,11 +755,6 @@ final class StreamLayerUIView: UIView {
        scrollPan.allowedScrollTypesMask = .all
        scrollPan.allowedTouchTypes = []
        addGestureRecognizer(scrollPan)
-        // Pencil squeeze / double-tap → the pen plane's barrel buttons (no-op while
-        // `penEnabled` is false — PencilStream ignores interactions out of range).
-        let pencilInteraction = UIPencilInteraction()
-        pencilInteraction.delegate = pencil
-        addInteraction(pencilInteraction)
        #endif
        backgroundColor = .black
    }
@@ -810,32 +779,17 @@ final class StreamLayerUIView: UIView {
    private enum TouchKind { case down, move, up, cancel }

    /// Split a touch batch by kind: an INDIRECT POINTER (mouse/trackpad with no lock) drives
-    /// the host cursor as an absolute mouse; a Pencil goes to the pen plane when the host
-    /// supports it; everything else (direct finger — and the Pencil toward a pen-less host)
-    /// is a host touch. Mixed batches are possible, so partition rather than branch on the
-    /// first touch.
+    /// the host cursor as an absolute mouse; everything else (direct finger, Pencil) is a host
+    /// touch. Mixed batches are possible, so partition rather than branch on the first touch.
    private func route(_ touches: Set<UITouch>, event: UIEvent?, kind: TouchKind) {
        var fingers: Set<UITouch> = []
-        var pencilTouches: Set<UITouch> = []
        for touch in touches {
            if touch.type == .indirectPointer {
                handleIndirectPointer(touch, event: event, kind: kind)
-            } else if penEnabled, touch.type == .pencil {
-                pencilTouches.insert(touch)
            } else {
                fingers.insert(touch)
            }
        }
-        if !pencilTouches.isEmpty {
-            let phase: PencilStream.Phase =
-                switch kind {
-                case .down: .down
-                case .move: .move
-                case .up: .up
-                case .cancel: .cancel
-                }
-            pencil.touches(pencilTouches, event: event, phase: phase, in: self)
-        }
        if !fingers.isEmpty { forwardFingers(fingers, kind: kind) }
    }

@@ -907,11 +861,8 @@ final class StreamLayerUIView: UIView {
        }
    }

-    /// Button-less mouse/trackpad movement (no lock) → absolute cursor move — unless it is a
-    /// hovering PENCIL (`zOffset > 0`) on a pen-capable host, which becomes in-range pen
-    /// samples (hover preview with distance/tilt/azimuth) instead of a cursor move.
+    /// Button-less mouse/trackpad movement (no lock) → absolute cursor move.
    @objc private func handleHover(_ recognizer: UIHoverGestureRecognizer) {
-        if penEnabled, pencil.maybeHover(recognizer, in: self) { return }
        switch recognizer.state {
        case .began, .changed:
            if let h = hostPoint(from: recognizer.location(in: self)) { onPointerMoveAbs?(h) }
@@ -119,25 +119,6 @@ final class GamepadWireTests: XCTestCase {
        XCTAssertEqual(GamepadWire.maxPads, 16)
    }

-    func testAnExplicitControllerTypeIsWhatEveryPadDeclares() {
-        // The regression this pins: the "Controller type" setting reached the Hello only, and each
-        // pad's arrival then re-declared the DETECTED kind — which the host honors over the
-        // session default, so "emulate my DualSense as a DualShock 4" produced a DualSense.
-        // (pf-client-core's `declared_kind` test is the same table.)
-        XCTAssertEqual(
-            GamepadManager.declaredKind(setting: .dualShock4, detected: .dualSense), .dualShock4)
-        // Every physical pad in a mixed session follows the one explicit choice.
-        for detected: PunktfunkConnection.GamepadType in [
-            .dualSense, .xbox360, .switchPro, .dualSenseEdge,
-        ] {
-            XCTAssertEqual(
-                GamepadManager.declaredKind(setting: .xbox360, detected: detected), .xbox360)
-        }
-        // Automatic keeps per-pad detection — otherwise a mixed session collapses to one type.
-        XCTAssertEqual(GamepadManager.declaredKind(setting: .auto, detected: .dualSense), .dualSense)
-        XCTAssertEqual(GamepadManager.declaredKind(setting: .auto, detected: .switchPro), .switchPro)
-    }
-
    func testTouchpadConversionCorners() {
        // GC ±1 with +y up → wire 0...65535 with origin top-left, +y down.
        let topLeft = GamepadWire.touchpad(x: -1, y: 1)
@@ -10,17 +10,9 @@ import {
  showModal,
  staticClasses,
 } from "@decky/ui";
-import { definePlugin, routerHook, toaster } from "@decky/api";
+import { definePlugin, routerHook } from "@decky/api";
 import { FC } from "react";
-import {
-  FaDownload,
-  FaLock,
-  FaLockOpen,
-  FaPlay,
-  FaPlus,
-  FaSyncAlt,
-  FaTv,
-} from "react-icons/fa";
+import { FaDownload, FaLock, FaLockOpen, FaPlay, FaSyncAlt, FaTv } from "react-icons/fa";
 import { PluginErrorBoundary } from "./boundary";
 import {
  applyUpdate,
@@ -39,19 +31,7 @@ import {
 import { streamPin } from "./library";
 import { PunktfunkRoute, ROUTE } from "./page";
 import { PairModal } from "./pair";
-import { ensureGamepadUiShortcut, recreateShortcuts } from "./steam";
-
-// Recovery action for "the Punktfunk library entry vanished" — recreates the visible shortcut.
-// Deleting the shortcut (optionally + reinstalling the plugin) leaves a stale appId in Steam's
-// CEF localStorage that self-heal fixes on the next mount, but this gives an in-session button
-// that works even without a reload. Always ends in a toast so the tap has feedback.
-async function recreatePunktfunkShortcut(): Promise<void> {
-  const appId = await recreateShortcuts();
-  toaster.toast({
-    title: "Punktfunk",
-    body: appId != null ? "Shortcut restored to your library" : "Couldn't create the shortcut",
-  });
-}
+import { ensureGamepadUiShortcut } from "./steam";

 // ----------------------------------------------------------------------------------------
 // QAM panel — quick status + entry into the full page + one-tap stream for known hosts
@@ -210,16 +190,6 @@ const QamPanel: FC = () => {
            {checking ? "Checking…" : "Check for updates"}
          </ButtonItem>
        </PanelSectionRow>
-        <PanelSectionRow>
-          <ButtonItem
-            layout="below"
-            description="Missing the Punktfunk entry in your library? This puts it back."
-            onClick={() => void recreatePunktfunkShortcut()}
-          >
-            <FaPlus style={{ marginRight: "0.5em" }} />
-            Recreate library shortcut
-          </ButtonItem>
-        </PanelSectionRow>
      </PanelSection>
    </>
  );
@@ -55,29 +55,6 @@ declare const collectionStore:
  | { SetAppsAsHidden?: (appIds: number[], hidden: boolean) => void }
  | undefined;

-// SteamUI's appStore indexes every registered app/shortcut by appId; a remembered appId whose
-// overview is gone was deleted out from under us (the user removed the library entry). We must
-// verify this because the remembered appId lives in Steam's CEF localStorage — which survives a
-// plugin UNINSTALL/REINSTALL — so a manually-deleted shortcut otherwise leaves a dangling appId
-// that the reuse path below silently repoints (SetShortcut* on a dead id is a no-op), and the
-// entry never comes back.
-declare const appStore:
-  | { GetAppOverviewByAppID?: (appId: number) => unknown | null }
-  | undefined;
-
-/** True if a remembered appId still maps to a live Steam shortcut. When appStore is unavailable
- *  we can't tell, so assume it exists — better to keep reusing than risk a duplicate library
- *  entry from a false "missing". A confident null means the shortcut was deleted → recreate. */
-function shortcutStillExists(appId: number): boolean {
-  try {
-    const get = appStore?.GetAppOverviewByAppID;
-    if (!get) return true; // no way to verify — preserve the reuse path
-    return get(appId) != null;
-  } catch {
-    return true;
-  }
-}
-
 /** Set a shortcut's library visibility (best-effort, deferred — the overview registers a moment
 *  after AddShortcut). Hides the stateful stream shortcut; keeps the gamepad-UI one visible. */
 function setShortcutHidden(appId: number, hidden: boolean): void {
@@ -222,10 +199,8 @@ async function ensureStreamShortcut(): Promise<{ appId: number; runner: string }
  const startDir = info.runner.replace(/\/[^/]*$/, ""); // the plugin's bin/ dir
  void ensureControllerConfig(); // fire-and-forget — never blocks the launch

-  // Reuse the remembered shortcut only if it still exists — a stale appId (shortcut deleted, key
-  // outlived it across a reinstall) must fall through to AddShortcut, not be silently repointed.
  const remembered = recall(STORAGE_KEY_STREAM);
-  if (remembered != null && shortcutStillExists(remembered)) {
+  if (remembered != null) {
    SteamClient.Apps.SetShortcutExe(remembered, SHELL);
    SteamClient.Apps.SetShortcutStartDir(remembered, startDir);
    SteamClient.Apps.SetShortcutName(remembered, SHORTCUT_NAME);
@@ -261,11 +236,8 @@ export async function ensureGamepadUiShortcut(): Promise<number | null> {
    // home). %command% expands to the shortcut exe (/bin/sh); the wrapper rides behind as an arg.
    const launchOpts = `PF_BROWSE=1 %command% "${info.runner}"`;

-    // Reuse the remembered entry only if it still exists; a stale appId (deleted shortcut whose
-    // localStorage key survived a plugin reinstall) falls through to AddShortcut so the visible
-    // library entry actually comes back instead of repointing a dead id.
    let appId = recall(STORAGE_KEY_UI);
-    if (appId != null && shortcutStillExists(appId)) {
+    if (appId != null) {
      SteamClient.Apps.SetShortcutExe(appId, SHELL);
      SteamClient.Apps.SetShortcutStartDir(appId, startDir);
      SteamClient.Apps.SetShortcutName(appId, SHORTCUT_NAME);
@@ -284,30 +256,6 @@ export async function ensureGamepadUiShortcut(): Promise<number | null> {
  }
 }

-/**
- * Force the visible "Punktfunk" library entry back into existence — the recovery button for
- * "my shortcut disappeared". Drops any remembered appId that no longer maps to a live shortcut
- * (so it can't shadow a fresh AddShortcut), then re-ensures. Safe to press anytime: a shortcut
- * that still exists is left in place (no duplicate); a missing one is recreated. Covers the case
- * self-heal-on-mount can't — deleting the shortcut WITHOUT reinstalling (no mount → no ensure).
- * Returns the (new or existing) visible appId, or null on failure.
- */
-export async function recreateShortcuts(): Promise<number | null> {
-  for (const key of [STORAGE_KEY_STREAM, STORAGE_KEY_UI]) {
-    const id = recall(key);
-    if (id != null && !shortcutStillExists(id)) {
-      try {
-        localStorage.removeItem(artKey(id)); // stale art marker for the dead appId
-        localStorage.removeItem(key);
-      } catch {
-        /* ignore */
-      }
-    }
-  }
-  // Recreate the visible entry now; the hidden stream shortcut re-registers lazily on next launch.
-  return ensureGamepadUiShortcut();
-}
-
 /** Launch the stateless gamepad-UI shortcut (console home) from the plugin, e.g. a QAM button. */
 export async function launchGamepadUi(): Promise<void> {
  const appId = await ensureGamepadUiShortcut();
@@ -547,7 +547,6 @@ impl AppModel {
                    crate::video::decodable_codecs(), // codecs (unused by the probe, but honest)
                    0,                                // preferred_codec: no preference
                    None, // display_hdr: probe connect, nothing presents
-                    0,    // client_caps: probe connect, nothing renders a cursor
                    None, // launch: probe connect, no game
                    pin,
                    Some(identity),
@@ -3,7 +3,7 @@
 //! scenes.

 use crate::app::AppModel;
-use crate::trust::{forget_placeholder, KnownHost, KnownHosts};
+use crate::trust::{KnownHost, KnownHosts};
 use crate::ui_hosts::{ConnectRequest, HostsMsg};
 use gtk::glib;
 use gtk::prelude::*;
@@ -252,6 +252,18 @@ fn probe_all(hosts: &[KnownHost]) -> Vec<bool> {
    )
 }

+/// Drop an fp-less placeholder for `addr:port` (see `headless_pair`). No-op when none exists.
+fn forget_placeholder(addr: &str, port: u16) {
+    let mut known = KnownHosts::load();
+    let before = known.hosts.len();
+    known
+        .hosts
+        .retain(|h| !(h.fp_hex.is_empty() && h.addr == addr && h.port == port));
+    if known.hosts.len() != before {
+        let _ = known.save();
+    }
+}
+
 /// `--list-hosts [--probe]` — the saved known-hosts store as JSON (the store the Decky plugin
 /// renders). With `--probe`, each host carries an `online` bool from a live reachability probe
 /// (mDNS-independent); without it, `online` is `null` (unknown — the caller falls back to its
@@ -620,7 +632,6 @@ fn mock_library() -> (
        store: store.to_string(),
        title: title.to_string(),
        art: crate::library::Artwork::default(),
-        platform: None,
    };
    let games = vec![
        game("steam:570", "steam", "Dota 2"),
@@ -523,9 +523,6 @@ async fn session(args: Args) -> Result<()> {
            // writes it into the virtual display's EDID (CTA HDR block), so the EDID-forwarding
            // path can be validated headlessly (check the host's monitor caps / ADD log line).
            display_hdr: punktfunk_core::client::display_hdr_env_override(),
-            // No CLIENT_CAP_CURSOR: this headless tool renders nothing — advertising it would
-            // just strip the pointer from the dumped bitstream.
-            client_caps: 0,
        }
        .encode(),
    )
@@ -8,7 +8,6 @@ presenter of the Linux client re-architecture (punktfunk-planning:
 ```
 punktfunk-session --connect host[:port] [--fp HEX] [--launch id] [--fullscreen] [--stats]
 punktfunk-session --browse host[:port] [--mgmt PORT] [--fullscreen]
-punktfunk-session --pair <PIN> --connect host[:port] [--name LABEL]
 ```

 `--browse` opens the console game library (the Skia coverflow over the animated aurora)
@@ -18,16 +17,9 @@ pairing is the desktop client / Decky plugin's job. `PUNKTFUNK_FAKE_LIBRARY=<fil
 feeds canned entries with no host (portrait paths starting with `/` load from disk).

 Reads the same identity / known-hosts / settings stores as the desktop client
-(`punktfunk-client`), so enrolling on either side makes the other work; this binary never
+(`punktfunk-client`) — pair there (or via its headless `--pair`) first; this binary never
 connects to a host it has no pinned fingerprint for (`--fp HEX` overrides the store).

-`--pair <PIN> --connect host[:port]` runs the SPAKE2 ceremony with no window and no
-toolkit, prints `paired <addr>:<port> fp=<hex>`, and exits — the route for a machine that
-has only SSH (an embedded/kiosk client, an image being provisioned). `--name` sets the
-label the host files this client under, defaulting to the hostname. It is in the
-`--no-default-features` build too: enrolling must never be the reason a minimal image has
-to pull in Skia.
-
 Stdout is the machine interface: `{"ready":true}` after the first presented frame,
 `stats: …` once per second while the overlay tier isn't Off (always the full detailed
 text, whatever the OSD shows; `--stats` forces the overlay on), one
@@ -105,7 +105,7 @@ pub fn run(target: Option<&str>) -> u8 {
    };

    let opts = ConsoleOptions {
-        device_name: trust::device_name(),
+        device_name: device_name(),
        deck: is_steam_deck(),
    };
    let (overlay, handles) = match SkiaOverlay::console(opts, entry) {
@@ -251,6 +251,22 @@ pub fn run(target: Option<&str>) -> u8 {
    }
 }

+/// The machine's name — what the host lists this client as after pairing.
+fn device_name() -> String {
+    #[cfg(target_os = "linux")]
+    if let Ok(s) = std::fs::read_to_string("/etc/hostname") {
+        let s = s.trim();
+        if !s.is_empty() {
+            return s.to_string();
+        }
+    }
+    std::env::var("COMPUTERNAME")
+        .or_else(|_| std::env::var("HOSTNAME"))
+        .ok()
+        .filter(|s| !s.trim().is_empty())
+        .unwrap_or_else(|| "This device".into())
+}
+
 fn host_display_name(name: &str, addr: &str) -> String {
    if name.trim().is_empty() {
        addr.to_string()
@@ -5,9 +5,8 @@
 //! One stream session per invocation: `--connect host[:port]` (+ `--fp HEX`,
 //! `--launch id`, `--fullscreen`), exits when the session ends. Reads the same identity
 //! / known-hosts / settings stores as the desktop shell on each OS — the GTK client
-//! (`punktfunk-client`) on Linux, the WinUI client on Windows — so pairing on either side
-//! makes the other connect silently. `--pair <PIN> --connect host` runs the ceremony here,
-//! with no window and no toolkit, for machines that have only a shell.
+//! (`punktfunk-client`) on Linux, the WinUI client on Windows — so pairing there (or
+//! via the shell's headless `--pair`) makes this binary connect silently.
 //!
 //! Stdout is the machine interface (the shell↔session contract): `{"ready":true}` after
 //! the first presented frame, `stats:` lines per 1 s window, one `{"error": …}` /
@@ -62,54 +61,6 @@ mod session_main {
        Some((x.trim().parse().ok()?, y.trim().parse().ok()?))
    }

-    /// `--pair <PIN> --connect host[:port]` — the SPAKE2 PIN ceremony with no window, no GTK
-    /// and no console UI, so a machine that has only SSH can be enrolled: an embedded/kiosk
-    /// client, a headless box, an image being provisioned. Writes the verified host into the
-    /// same known-hosts store `--connect` reads, so pairing here is exactly what makes the
-    /// later stream connect silently.
-    ///
-    /// Deliberately identical in shape and output to `punktfunk-client --pair` (which stays
-    /// the desktop route) — the difference is only that this binary carries no toolkit, so it
-    /// is the one a minimal image installs. Present in the `--no-default-features` build too:
-    /// enrolment must not be the reason an embedded image has to pull in Skia.
-    fn headless_pair(pin: &str) -> u8 {
-        let Some(target) = arg_value("--connect") else {
-            eprintln!("--pair requires --connect host[:port]");
-            return EXIT_CONNECT_FAILED;
-        };
-        let (addr, port) = parse_host_port(&target);
-        // The label the HOST files this client under. A headless box has nobody to ask, so
-        // the hostname is the only name that will mean anything in the paired-devices list.
-        let name = arg_value("--name").unwrap_or_else(trust::device_name);
-
-        let identity = match trust::load_or_create_identity() {
-            Ok(i) => i,
-            Err(e) => {
-                eprintln!("client identity: {e:#}");
-                return EXIT_CONNECT_FAILED;
-            }
-        };
-        match trust::pair_with_host(&addr, port, &identity, pin, &name) {
-            Ok(fp) => {
-                let fp_hex = trust::hex(&fp);
-                trust::persist_host(
-                    &arg_value("--host-label").unwrap_or_else(|| addr.clone()),
-                    &addr,
-                    port,
-                    &fp_hex,
-                    true,
-                );
-                trust::forget_placeholder(&addr, port);
-                println!("paired {addr}:{port} fp={fp_hex}");
-                0
-            }
-            Err(e) => {
-                eprintln!("pairing failed: {} ({e:?})", trust::pair_error_message(&e));
-                EXIT_TRUST_REJECTED
-            }
-        }
-    }
-
    /// `host[:port]`, port defaulting to the native 9777.
    pub(crate) fn parse_host_port(target: &str) -> (String, u16) {
        match target.rsplit_once(':') {
@@ -204,17 +155,9 @@ mod session_main {
            mode,
            compositor: CompositorPref::from_name(&settings.compositor)
                .unwrap_or(CompositorPref::Auto),
-            gamepad: {
-                // The setting AS CHOSEN goes to the pad service too, not just the Hello: the host
-                // builds each virtual pad from that pad's arrival and only falls back to this
-                // session default for a pad that never declares one, so an explicit choice that
-                // stopped here would be undone the moment a controller connected.
-                let chosen = GamepadPref::from_name(&settings.gamepad).unwrap_or(GamepadPref::Auto);
-                gamepad.set_kind_override(chosen);
-                match chosen {
-                    GamepadPref::Auto => gamepad.auto_pref(),
-                    explicit => explicit,
-                }
+            gamepad: match GamepadPref::from_name(&settings.gamepad) {
+                Some(GamepadPref::Auto) | None => gamepad.auto_pref(),
+                Some(explicit) => explicit,
            },
            bitrate_kbps: settings.bitrate_kbps,
            audio_channels: settings.audio_channels,
@@ -229,11 +172,6 @@ mod session_main {
            // defaults for Linux clients; `PUNKTFUNK_CLIENT_PEAK_NITS` (read in the session
            // pump) pins one manually.
            display_hdr: None,
-            // The presenter renders the host cursor locally in desktop mouse mode (M2 cursor
-            // channel); capture-mode sessions keep the composited cursor, so only advertise
-            // when the session STARTS in desktop mode. The host gates further (Linux portal
-            // compositors only).
-            cursor_forward: settings.mouse_mode() == trust::MouseMode::Desktop,
            mic_enabled: settings.mic_enabled,
            clipboard,
            // The Settings preference (auto → VAAPI where it exists; the presenter
@@ -369,13 +307,6 @@ mod session_main {
            };
        }

-        // `--pair <PIN>`: enrol this machine against a host and exit. Sits with the other
-        // non-streaming subcommands, above every graphics call — the box doing this may have
-        // no display at all.
-        if let Some(pin) = arg_value("--pair") {
-            return headless_pair(&pin);
-        }
-
        // Before any Vulkan call: make RADV expose its video-decode queue + extensions so the
        // decoder's `auto` path prefers Vulkan Video over VAAPI (Steam Deck, and any gated RADV).
        // Windows drivers (NVIDIA/AMD Adrenalin) expose theirs unconditionally.
@@ -433,14 +364,12 @@ mod session_main {
            eprintln!(
                "usage: punktfunk-session --connect host[:port] [--fp HEX] [--launch id] [--fullscreen]\n\
                 \x20      punktfunk-session --browse [host[:port]] [--mgmt PORT] [--fullscreen] [--json-status]\n\
-                 \x20      punktfunk-session --pair <PIN> --connect host[:port] [--name LABEL]\n\
                 \n\
                 Streams from a paired punktfunk host in a Vulkan window. --browse opens the\n\
                 gamepad console instead: bare --browse is the host list (discovery, PIN\n\
                 pairing, settings, wake-on-LAN); with a target it opens that host's game\n\
                 library. --connect never dials a host it has no pinned fingerprint for —\n\
-                 enrol with --pair (no display needed), in the console, or from the desktop\n\
-                 client."
+                 pair in the console or via `punktfunk-client --pair <PIN> --connect …`."
            );
            return EXIT_CONNECT_FAILED;
        };
@@ -472,7 +401,7 @@ mod session_main {
                "error",
                &format!(
                    "no pinned fingerprint for {addr}:{port} — pair first \
-                     (punktfunk-session --pair <PIN> --connect {addr}:{port}) or pass --fp HEX"
+                     (punktfunk-client --pair <PIN> --connect {addr}:{port}) or pass --fp HEX"
                ),
                Some(true),
            );
@@ -13,17 +13,8 @@
 // console behind the couch UI looks like a crash.
 #![cfg_attr(windows, windows_subsystem = "windows")]

-// The shared client log sink (std-only): a couch launch has no console, so the session's
-// stderr would otherwise evaporate — same reasoning as the shell's tee. This shim only
-// initializes + forwards; the module's subscriber-side surface stays unused here.
-#[cfg(windows)]
-#[path = "../logfile.rs"]
-#[allow(dead_code)]
-mod logfile;
-
 #[cfg(windows)]
 fn main() {
-    logfile::init();
    // The session binary ships beside us in the package; fall back to PATH for a dev run.
    let session = std::env::current_exe()
        .ok()
@@ -36,14 +27,7 @@ fn main() {
    if !std::env::args().any(|a| a == "--windowed") {
        cmd.arg("--fullscreen");
    }
-    cmd.stderr(std::process::Stdio::piped());
-    let run = cmd.spawn().and_then(|mut child| {
-        if let Some(stderr) = child.stderr.take() {
-            logfile::forward_child_stderr(stderr);
-        }
-        child.wait()
-    });
-    match run {
+    match cmd.status() {
        Ok(st) => std::process::exit(st.code().unwrap_or(0)),
        Err(_) => std::process::exit(1),
    }
@@ -1,98 +0,0 @@
-//! Persistent client log file: `%LOCALAPPDATA%\punktfunk\logs\client.log`.
-//!
-//! The shell is a `windows_subsystem` binary and spawns `punktfunk-session` with
-//! `CREATE_NO_WINDOW` — a normal GUI/MSIX launch has NO console, so before this module every
-//! log line (the shell's and, worse, the session's whole receive/decode/present forensic
-//! trail) evaporated exactly when a user hit a problem worth reporting. The 2026-07 PyroWave
-//! latency-sawtooth field report had to be triaged from host logs alone because the client
-//! side had nowhere to land.
-//!
-//! Mirrors the host's convention (`%ProgramData%\punktfunk\logs`, size-capped): a file over
-//! 10 MB is rotated to `.old` at the next client start, one generation kept. Everything is
-//! best-effort — a missing/locked directory degrades to plain stderr, never a startup failure.
-
-use std::fs::{File, OpenOptions};
-use std::io::{self, BufRead, Write};
-use std::path::PathBuf;
-use std::sync::{Arc, Mutex, OnceLock};
-
-/// Rotate at the next start once the file exceeds this (the host's cap).
-const ROTATE_BYTES: u64 = 10 * 1024 * 1024;
-
-static SINK: OnceLock<Option<Arc<Mutex<File>>>> = OnceLock::new();
-
-fn log_dir() -> Option<PathBuf> {
-    Some(PathBuf::from(std::env::var_os("LOCALAPPDATA")?).join(r"punktfunk\logs"))
-}
-
-/// The log file's path, for the "logs land here" startup line (and any future UI affordance).
-pub(crate) fn path() -> Option<PathBuf> {
-    Some(log_dir()?.join("client.log"))
-}
-
-/// Open (rotating first) and cache the sink. Called once at startup, before the tracing
-/// subscriber installs; every later [`tee`] shares the handle.
-pub(crate) fn init() {
-    SINK.get_or_init(|| {
-        let dir = log_dir()?;
-        std::fs::create_dir_all(&dir).ok()?;
-        let path = dir.join("client.log");
-        if std::fs::metadata(&path).is_ok_and(|m| m.len() > ROTATE_BYTES) {
-            let old = dir.join("client.log.old");
-            // Windows `rename` refuses an existing destination — drop the old generation first.
-            let _ = std::fs::remove_file(&old);
-            let _ = std::fs::rename(&path, &old);
-        }
-        let file = OpenOptions::new()
-            .create(true)
-            .append(true)
-            .open(&path)
-            .ok()?;
-        Some(Arc::new(Mutex::new(file)))
-    });
-}
-
-/// A writer that duplicates onto stderr (dev runs from a terminal keep their interleaved
-/// output) and the log file (GUI runs finally keep anything at all). The tracing subscriber's
-/// `with_writer` factory and the session-stderr forwarder both use it.
-pub(crate) struct Tee;
-
-/// `with_writer` factory (`fn() -> Tee` satisfies `MakeWriter`).
-pub(crate) fn tee() -> Tee {
-    Tee
-}
-
-impl Write for Tee {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        let _ = io::stderr().write_all(buf);
-        if let Some(Some(f)) = SINK.get() {
-            let _ = f.lock().unwrap().write_all(buf);
-        }
-        Ok(buf.len())
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        let _ = io::stderr().flush();
-        if let Some(Some(f)) = SINK.get() {
-            let _ = f.lock().unwrap().flush();
-        }
-        Ok(())
-    }
-}
-
-/// Forward a spawned child's stderr into the [`Tee`], line-buffered so its lines never
-/// interleave mid-line with the shell's own. Returns immediately; the thread dies with the
-/// pipe (child exit).
-pub(crate) fn forward_child_stderr(stderr: impl io::Read + Send + 'static) {
-    let _ = std::thread::Builder::new()
-        .name("punktfunk-session-log".into())
-        .spawn(move || {
-            let mut reader = io::BufReader::new(stderr);
-            let mut line = String::new();
-            let mut tee = Tee;
-            while matches!(reader.read_line(&mut line), Ok(n) if n > 0) {
-                let _ = tee.write_all(line.as_bytes());
-                line.clear();
-            }
-        });
-}
@@ -26,8 +26,6 @@ mod discovery;
 #[cfg(windows)]
 mod gpu;
 #[cfg(windows)]
-mod logfile;
-#[cfg(windows)]
 mod probe;
 #[cfg(windows)]
 mod shell_window;
@@ -51,20 +49,11 @@ fn main() {
    }
    set_app_user_model_id();

-    // Everything logs to stderr AND `%LOCALAPPDATA%\punktfunk\logs\client.log` (see [`logfile`]):
-    // a GUI/MSIX launch has no console, so without the file the client side of any field report
-    // simply doesn't exist. ANSI off — the file is what users send, keep it grep-clean.
-    logfile::init();
    tracing_subscriber::fmt()
-        .with_ansi(false)
-        .with_writer(logfile::tee)
        .with_env_filter(
            tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| "info".into()),
        )
        .init();
-    if let Some(p) = logfile::path() {
-        tracing::info!(path = %p.display(), "client log file (rotated at 10 MB, one .old kept)");
-    }

    let args: Vec<String> = std::env::args().collect();
    let flag = |name: &str| args.iter().any(|a| a == name);
@@ -99,16 +88,7 @@ fn main() {
        if !flag("--windowed") {
            cmd.arg("--fullscreen");
        }
-        // Spawn (not `status()`) so the session's stderr rides the log tee — a couch launch
-        // (Start-menu tile, Steam shortcut) has no console to inherit either.
-        cmd.stderr(std::process::Stdio::piped());
-        let run = cmd.spawn().and_then(|mut child| {
-            if let Some(stderr) = child.stderr.take() {
-                logfile::forward_child_stderr(stderr);
-            }
-            child.wait()
-        });
-        match run {
+        match cmd.status() {
            Ok(st) => std::process::exit(st.code().unwrap_or(0)),
            Err(e) => {
                eprintln!("could not start the console UI: {e}");
@@ -56,7 +56,6 @@ pub fn run_speed_probe(
        decodable_codecs(),
        0,    // preferred_codec: no preference
        None, // display_hdr: probe connect, nothing presents
-        0,    // client_caps: probe connect, nothing renders a cursor
        None, // launch: no game
        pin,
        Some(identity),
@@ -169,19 +169,13 @@ fn spawn_with(

    cmd.stdin(Stdio::null())
        .stdout(Stdio::piped())
-        // Piped through the log tee: dev-terminal runs keep the interleaved stderr they always
-        // had, and GUI runs — which have no console — finally keep the session's whole
-        // receive/decode/present log in the client log file.
-        .stderr(Stdio::piped())
+        .stderr(Stdio::inherit()) // session logs interleave with the shell's (dev runs)
        .creation_flags(CREATE_NO_WINDOW);
    let mut child = cmd
        .spawn()
        .map_err(|e| format!("couldn't start punktfunk-session: {e}"))?;
    tracing::info!(host = %host_label, "session binary spawned");

-    if let Some(stderr) = child.stderr.take() {
-        crate::logfile::forward_child_stderr(stderr);
-    }
    let stdout = child.stdout.take().expect("piped stdout");
    // Park the child where the kill handle (and the reader, for the final reap) reach it.
    *slot.0.lock().unwrap() = Some(child);
@@ -30,12 +30,6 @@ pipewire = "0.9"
 libc = "0.2"
 # ashpd 0.13 uses the tokio runtime for the one-time portal handshake (control plane).
 tokio = { version = "1", features = ["rt", "rt-multi-thread", "net", "time"] }
-# XFixes cursor source for gamescope (remote-desktop-sweep Phase C): gamescope paints no
-# `SPA_META_Cursor`, so the pointer never reaches the PipeWire node. We read the shape/hotspot/
-# visibility from gamescope's nested Xwayland via XFixes instead and feed the existing cursor slot.
-# `RustConnection` is the pure-Rust default (no libxcb link → no new C dependency on the host); the
-# `xfixes` feature (auto-pulls `render` + `shape`) is what exposes GetCursorImage/SelectCursorInput.
-x11rb = { version = "0.13", default-features = false, features = ["xfixes"] }

 [target.'cfg(target_os = "windows")'.dependencies]
 # The host<->driver wire contract for the sealed frame channel (control IOCTL structs + frame header).
@@ -49,9 +43,7 @@ windows = { version = "0.62", features = [
    "Win32_Graphics_Direct3D_Fxc",
    "Win32_Graphics_Dxgi",
    "Win32_Graphics_Dxgi_Common",
-    "Win32_Graphics_Gdi",
    "Win32_System_LibraryLoader",
-    "Win32_System_StationsAndDesktops",
    "Win32_System_Memory",
    "Win32_System_Threading",
    "Win32_UI_HiDpi",
@@ -7,12 +7,10 @@
 //! [`FrameChannelSender`] closure, so this crate reaches neither the encoder nor the host
 //! orchestrator).

+// Scaffold: trait defaults + synthetic sources are defined ahead of the backends that use them.
+#![allow(dead_code)]
 // Every unsafe block in this crate carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
 #![deny(clippy::undocumented_unsafe_blocks)]
-// …and that program only covers a whole `unsafe fn` body once the body needs its own block: in
-// edition 2021 `unsafe_op_in_unsafe_fn` is allow-by-default, which exempted the crate's hardest FFI
-// (the ring/slot construction, the channel broker, every D3D converter ctor) from the deny above.
-#![deny(unsafe_op_in_unsafe_fn)]

 use anyhow::Result;
 use pf_frame::{CapturedFrame, FramePayload, PixelFormat};
@@ -21,16 +19,9 @@ use pf_frame::{CapturedFrame, FramePayload, PixelFormat};
 #[cfg(target_os = "linux")]
 use pf_frame::DmabufFrame;

-/// Produces frames from a captured output. Lives on its own thread, handing frames over without
-/// ever blocking the compositor — the Linux portal publishes into a one-deep OVERWRITING slot
-/// (drop-oldest), so a stalled consumer costs the intermediate frames and is still handed the
-/// freshest one.
+/// Produces frames from a captured output. Lives on its own thread, feeding the encoder
+/// over a bounded drop-oldest channel (never block the compositor).
 pub trait Capturer: Send {
-    // ---- Frames -----------------------------------------------------------------------------
-    // `next_frame` blocks for one; `try_latest` is the steady-state non-blocking read;
-    // `wait_arrival` + `supports_arrival_wait` are the frame-driven trigger that replaces a
-    // free-running tick.
-
    fn next_frame(&mut self) -> Result<CapturedFrame>;

    /// [`next_frame`](Self::next_frame) with a caller-chosen first-frame budget instead of the
@@ -61,77 +52,17 @@ pub trait Capturer: Send {
    /// Block until a FRESH frame is available via [`try_latest`](Self::try_latest) or
    /// `deadline` passes — the encode loop's frame-driven wait (latency plan T1.1): waking on
    /// the compositor's publish instead of sampling at a free-running tick deletes the
-    /// sample-and-hold (~half a frame interval on average). Must NOT consume the frame — the
-    /// loop's `try_latest` call does that — so a backend implements this by waiting on a wakeup
-    /// and then PEEKING its hand-off slot. Only called when
-    /// [`supports_arrival_wait`](Self::supports_arrival_wait) is `true`; errors surface at the
-    /// following `try_latest`.
+    /// sample-and-hold (~half a frame interval on average). Must NOT consume the frame (the
+    /// loop's `try_latest` call does); backends buffer internally where the arrival channel
+    /// can't be peeked. Only called when [`supports_arrival_wait`](Self::supports_arrival_wait)
+    /// is `true`; errors surface at the following `try_latest`.
    fn wait_arrival(&mut self, _deadline: std::time::Instant) {}

-    // ---- Lifecycle --------------------------------------------------------------------------
-    // Whether the capturer is being used right now, and whether it can still be used at all.
-
    /// Gate expensive per-frame work so the capturer can be kept alive (reused) between
-    /// streams without burning CPU. The portal capturer skips the de-pad copy while inactive and
-    /// flushes its frame mailbox on `false`; the default is a no-op (synthetic sources are produced
-    /// on demand). Set `true` for the duration of a stream, `false` when it ends.
-    ///
-    /// `&mut self`: it mutates capturer state, and every caller owns the capturer. It took `&self`
-    /// only because the flag happened to be an `Arc<AtomicBool>` — an implementation detail leaking
-    /// into the contract, and one the mailbox flush this now also does would not have shared.
-    fn set_active(&mut self, _active: bool) {}
-
-    /// Whether this capturer can still produce frames — the gate a caller that POOLS capturers
-    /// across streams must consult before reusing one.
-    ///
-    /// Some backends have TERMINAL states that are only observable by trying to consume a frame:
-    /// the Linux portal capturer's zero-copy poison flag, a dead PipeWire thread, and a source that
-    /// never returns to `Streaming` are all sticky, and each makes every subsequent
-    /// [`next_frame`](Self::next_frame) / [`try_latest`](Self::try_latest) fail — for that backend
-    /// an `Err` from either is terminal, never transient. A pool that re-admits such a capturer
-    /// wedges the next session permanently (it re-fails at the same point, every reconnect), which
-    /// is why this predicate exists rather than leaving callers to infer liveness from an error they
-    /// have often already discarded.
-    ///
-    /// `true` (the default) for backends with no such state: the synthetic sources, and the Windows
-    /// IDD-push capturer, whose failures already end the session through its own rebuild path.
-    fn is_alive(&self) -> bool {
-        true
-    }
-
-    // ---- Cursor -----------------------------------------------------------------------------
-    // The out-of-band pointer: where it is, who draws it, and (Linux/gamescope) where to read it.
-
-    /// The capture source's LIVE cursor state, when it arrives out-of-band from the frames
-    /// (the Windows IddCx hardware-cursor channel). Polled by the encode loop every tick and
-    /// preferred over `CapturedFrame::cursor` — with a hardware cursor, pointer-only moves
-    /// produce NO new frame, so the frame-attached overlay would go stale on a static desktop.
-    /// Default `None`: the Linux portal path attaches its cursor to frames instead.
-    fn cursor(&mut self) -> Option<pf_frame::CursorOverlay> {
-        None
-    }
-
-    /// LIVE cursor-render flip for a cursor-forward session (design/remote-desktop-sweep.md §8):
-    /// `on = true` — the client draws the pointer, keep it OUT of the video; `on = false` —
-    /// the capture mouse model, the pointer must be IN the video again. The Windows IDD
-    /// capturer implements the composite side ITSELF (slot-copy + alpha-blended quad from the
-    /// GDI poller) — a declared IddCx hardware cursor is irrevocable, so DWM can never be
-    /// handed the job back. Called every encode tick (implementations cache; steady state is
-    /// one compare). Default no-op: the Linux portal never bakes the pointer into frames —
-    /// the encode loop blends its overlay instead.
-    fn set_cursor_forward(&mut self, _on: bool) {}
-
-    /// Attach a gamescope cursor source (remote-desktop-sweep Phase C). gamescope paints no
-    /// `SPA_META_Cursor`, so [`cursor`](Self::cursor)'s slot stays empty — this hands the Linux
-    /// portal capturer a way to reach gamescope's nested Xwaylands (it may run several — one per
-    /// `--xwayland-count`) so it reads the pointer shape/position over X11 (XFixes +
-    /// QueryPointer), following whichever display is focused, and publishes it into that same slot.
-    /// Called once, after the capturer is built, only for gamescope sessions. Default no-op: every
-    /// non-gamescope capturer already has a cursor source.
-    #[cfg(target_os = "linux")]
-    fn attach_gamescope_cursor(&mut self, _targets: GamescopeCursorTargets) {}
-
-    // ---- Stream properties ------------------------------------------------------------------
+    /// streams without burning CPU. The portal capturer skips the de-pad copy while inactive;
+    /// the default is a no-op (synthetic sources are produced on demand). Set `true` for the
+    /// duration of a stream, `false` when it ends.
+    fn set_active(&self, _active: bool) {}

    /// The source's static HDR mastering metadata (SMPTE ST.2086 + content light level), when the
    /// capturer can read it from the output (Windows `IDXGIOutput6::GetDesc1`). `None` = unknown /
@@ -152,18 +83,10 @@ pub trait Capturer: Send {
        1
    }

-    // ---- Host-initiated resize --------------------------------------------------------------
-    // These two are ONE operation split in half and must be implemented together: a backend that
-    // returns `Some` from `capture_target_id` is promising `resize_output` works, and one that
-    // implements `resize_output` without the identity leaves the caller no way to check that the
-    // display it just reconfigured is still this capturer's. Both defaults decline.
-
    /// The OS display-target id this capturer is bound to (Windows IDD-push), so the resize path
    /// can verify the display it just reconfigured is STILL the one this capturer serves (an
    /// in-place resize keeps the target; a re-arrival fallback mints a new one, which needs a
    /// fresh capturer). `None` = the backend has no such identity (every non-IDD backend).
-    ///
-    /// PAIRED with [`resize_output`](Self::resize_output) — see the cluster note above.
    fn capture_target_id(&self) -> Option<u32> {
        None
    }
@@ -174,25 +97,9 @@ pub trait Capturer: Send {
    /// EXTERNAL changes only) and no teardown: the capture pipeline and its send thread survive;
    /// only the encoder is swapped by the caller once the first new-size frame arrives. Returns
    /// `true` when handled; `false` (the default) routes the caller to the full-rebuild path.
-    ///
-    /// PAIRED with [`capture_target_id`](Self::capture_target_id) — see the cluster note above.
    fn resize_output(&mut self, _width: u32, _height: u32) -> bool {
        false
    }
-
-    /// Recreate the delivery ring at the CURRENT mode and re-run the driver attach handshake —
-    /// the recovery half of a swap-chain bounce the descriptor poller cannot see: an
-    /// exclusive-topology eviction (the vdisplay re-assert watchdog) is a real topology change,
-    /// so the OS drives COMMIT_MODES on the live virtual display too and the driver's swap-chain
-    /// is recreated while this capturer keeps waiting on the old ring attachment — frames stop
-    /// with an unchanged descriptor (same mode, same HDR), so the two-strike debounce never
-    /// trips. Arms the same recover-or-drop window as a real resize, so a driver that cannot
-    /// re-attach still fails the session cleanly. Returns `true` when handled; `false` (the
-    /// default) means the backend has no in-place ring recovery and the caller should treat the
-    /// pipeline as unrecoverable in place.
-    fn recreate_ring_in_place(&mut self) -> bool {
-        false
-    }
 }

 /// A deterministic moving test pattern (BGRx). Lets the spike exercise the encode → file →
@@ -364,23 +271,6 @@ pub struct ZeroCopyPolicy {
    pub pyrowave_modifiers: Vec<u64>,
 }

-/// Discovers gamescope's nested Xwayland cursor targets — `(DISPLAY, XAUTHORITY)`, one per
-/// `--xwayland-count` — for [`Capturer::attach_gamescope_cursor`].
-///
-/// A CLOSURE, not the `Vec` it used to be, and re-run on a slow cadence by the cursor worker. The
-/// snapshot was taken once, before the game launched: gamescope creates a second Xwayland for the
-/// game but only advertises the FIRST in any child's environ, so the game's display was invisible to
-/// discovery — and when the connected (Big Picture) display then reported "gamescope is not drawing
-/// the pointer here", the source blanked the cursor for the whole game session, which is the exact
-/// regression the module doc says it fixed. A provider also lets the worker retry a display that
-/// died, and lets a stream that starts BEFORE the game converge instead of staying cursorless.
-///
-/// Built by the host facade (it wraps `pf_vdisplay::gamescope_xwayland_cursor_targets`), exactly
-/// like [`FrameChannelSender`] — so the capture→host edge stays one-way.
-#[cfg(target_os = "linux")]
-pub type GamescopeCursorTargets =
-    std::sync::Arc<dyn Fn() -> Vec<(String, Option<String>)> + Send + Sync>;
-
 #[cfg(target_os = "linux")]
 pub fn capturer_supports_444(_encoder_ingests_rgb_444: bool) -> bool {
    true
@@ -477,26 +367,6 @@ pub type FrameChannelSender = std::sync::Arc<
    dyn Fn(&pf_driver_proto::control::SetFrameChannelRequest) -> Result<()> + Send + Sync,
 >;

-/// Delivery closure for the v5 hardware-cursor channel (`IOCTL_SET_CURSOR_CHANNEL`) — same
-/// facade contract as [`FrameChannelSender`]. `Some` also OPTS THE SESSION IN: the capturer
-/// creates + delivers the cursor section only when the host hands it a sender (the negotiated
-/// cursor-forward sessions), and the driver only declares the hardware cursor once that
-/// delivery lands — so a plain session keeps DWM's composited pointer untouched.
-#[cfg(target_os = "windows")]
-pub type CursorChannelSender = std::sync::Arc<
-    dyn Fn(&pf_driver_proto::control::SetCursorChannelRequest) -> Result<()> + Send + Sync,
->;
-
-/// The mid-stream cursor-render flip (`IOCTL_SET_CURSOR_FORWARD`, proto v6) as a host-facade
-/// closure — same contract as [`CursorChannelSender`]. `bool` = declare the IddCx hardware
-/// cursor (`true`) or stand it down (`false`; the host facade additionally forces the same-mode
-/// re-commit that actualises the OS's software-cursor default). The capturer drives this from
-/// its secure-desktop watch: UAC/Winlogon render only through the software-cursor path, so a
-/// path pinned to the hardware cursor never presents them (the 0.18.0 secure-desktop
-/// regression).
-#[cfg(target_os = "windows")]
-pub type CursorForwardSender = std::sync::Arc<dyn Fn(bool) -> Result<()> + Send + Sync>;
-
 // One-time PipeWire library init, shared by the video (portal) and audio capture threads.
 #[cfg(target_os = "linux")]
 pub mod pwinit;
@@ -529,25 +399,15 @@ pub mod synthetic_nv12;
 /// `want_hdr` offers the GNOME 50+ HDR formats (10-bit PQ/BT.2020 dmabufs) instead of the SDR
 /// set — pass it only when the mirrored monitor is actually in HDR mode (the host probes
 /// DisplayConfig) or the negotiation runs into its 10 s timeout and latches the SDR downgrade.
-/// `want_metadata_cursor` asks for cursor-as-metadata (`SPA_META_Cursor`) — pass it only when
-/// the session's encode path composites `CapturedFrame::cursor` (the host consults
-/// `pf-encode`'s `cursor_blend_capable`); otherwise the portal EMBEDS the pointer so it is
-/// never silently lost. The [`ZeroCopyPolicy`] carries the pre-resolved encode-backend facts
-/// (the one-way edge).
+/// The [`ZeroCopyPolicy`] carries the pre-resolved encode-backend facts (the one-way edge).
 #[cfg(target_os = "linux")]
 pub fn open_portal_monitor(
    anchored: bool,
    want_hdr: bool,
-    want_metadata_cursor: bool,
    policy: ZeroCopyPolicy,
 ) -> Result<Box<dyn Capturer>> {
-    linux::PortalCapturer::open(
-        anchored,
-        want_hdr && !hdr_capture_failed(),
-        want_metadata_cursor,
-        policy,
-    )
-    .map(|c| Box::new(c) as Box<dyn Capturer>)
+    linux::PortalCapturer::open(anchored, want_hdr && !hdr_capture_failed(), policy)
+        .map(|c| Box::new(c) as Box<dyn Capturer>)
 }

 /// Open the Linux portal capturer bound to an already-created virtual output's PipeWire node. The
@@ -564,7 +424,6 @@ pub fn open_virtual_output(
    allow_zerocopy: bool,
    want_444: bool,
    policy: ZeroCopyPolicy,
-    expect_exact_dims: bool,
 ) -> Result<Box<dyn Capturer>> {
    linux::PortalCapturer::from_virtual_output(
        remote_fd,
@@ -574,7 +433,6 @@ pub fn open_virtual_output(
        allow_zerocopy,
        want_444,
        policy,
-        expect_exact_dims,
    )
    .map(|c| Box::new(c) as Box<dyn Capturer>)
 }
@@ -592,8 +450,6 @@ pub fn open_idd_push(
    pyrowave: bool,
    keepalive: Box<dyn Send>,
    sender: FrameChannelSender,
-    cursor_sender: Option<CursorChannelSender>,
-    cursor_forward: Option<CursorForwardSender>,
 ) -> std::result::Result<Box<dyn Capturer>, (anyhow::Error, Box<dyn Send>)> {
    idd_push::IddPushCapturer::open(
        target,
@@ -603,8 +459,6 @@ pub fn open_idd_push(
        pyrowave,
        keepalive,
        sender,
-        cursor_sender,
-        cursor_forward,
    )
    .map(|c| Box::new(c) as Box<dyn Capturer>)
 }
@@ -1,419 +0,0 @@
-//! The portal CONTROL PLANE: the xdg ScreenCast / RemoteDesktop handshake (async, `ashpd` over
-//! zbus, on its own tokio runtime), the cursor-mode choice, and GNOME's BT.2100 colour-mode probe.
-//!
-//! Split out of `linux/mod.rs` (sweep Phase 5.3) to separate the async control plane from the
-//! realtime half: nothing here runs per frame — the handshake happens once, then the thread parks
-//! until `PortalSession`'s `Drop` (in the parent) releases it, and DROPPING the zbus
-//! connection is what ends the compositor's cast. The probe is likewise a one-shot D-Bus round-trip
-//! for a control-plane caller.
-
-use anyhow::{anyhow, Context, Result};
-use std::os::fd::OwnedFd;
-
-/// Whether the monitor this host would mirror is currently in BT.2100 (HDR) colour mode — the
-/// precondition for Mutter's monitor screencast advertising the 10-bit PQ formats (GNOME 50+;
-/// Mutter only appends the HDR formats while the mirrored monitor's colour state is BT.2020+PQ).
-/// Queried over the session bus: `DisplayConfig.GetCurrentState`, monitor property
-/// `"color-mode" == 1` (`META_COLOR_MODE_BT2100`). `false` on any error — not GNOME, a pre-48
-/// Mutter without colour modes, no monitors — so callers fall back to the honest SDR offer.
-/// Blocking (one D-Bus round-trip on a fresh connection); call from control-plane threads only.
-///
-/// **Scoped to `PUNKTFUNK_CAPTURE_MONITOR` when it is set** (`design/per-monitor-portal-capture.md`
-/// §7.4). Without a pin this asks "is ANY monitor in HDR mode", which was a fair heuristic while the
-/// capture path took whatever monitor it was handed — but once the operator names the head, an
-/// HDR-capable *neighbour* must not talk this host into offering PQ formats for an SDR panel.
-pub fn gnome_hdr_monitor_active() -> bool {
-    use ashpd::zbus;
-    // GetCurrentState reply: (serial, monitors, logical_monitors, properties); each monitor is
-    // (spec(ssss), modes a(siiddada{sv}), properties a{sv}) — "color-mode" lives in the monitor
-    // properties.
-    type Mode = (
-        String,
-        i32,
-        i32,
-        f64,
-        f64,
-        Vec<f64>,
-        std::collections::HashMap<String, zbus::zvariant::OwnedValue>,
-    );
-    type Monitor = (
-        (String, String, String, String),
-        Vec<Mode>,
-        std::collections::HashMap<String, zbus::zvariant::OwnedValue>,
-    );
-    type LogicalMonitor = (
-        i32,
-        i32,
-        f64,
-        u32,
-        bool,
-        Vec<(String, String, String, String)>,
-        std::collections::HashMap<String, zbus::zvariant::OwnedValue>,
-    );
-    type State = (
-        u32,
-        Vec<Monitor>,
-        Vec<LogicalMonitor>,
-        std::collections::HashMap<String, zbus::zvariant::OwnedValue>,
-    );
-    let probe = || -> Result<bool> {
-        // zbus is built async-only here (ashpd's tokio integration) — run the one round-trip on
-        // a throwaway current-thread runtime; this is a control-plane call, never per-frame.
-        let rt = tokio::runtime::Builder::new_current_thread()
-            .enable_all()
-            .build()
-            .context("build tokio runtime")?;
-        rt.block_on(async {
-            let conn = zbus::Connection::session().await.context("session bus")?;
-            let reply = conn
-                .call_method(
-                    Some("org.gnome.Mutter.DisplayConfig"),
-                    "/org/gnome/Mutter/DisplayConfig",
-                    Some("org.gnome.Mutter.DisplayConfig"),
-                    "GetCurrentState",
-                    &(),
-                )
-                .await
-                .context("DisplayConfig.GetCurrentState")?;
-            let (_serial, monitors, _logical, _props): State = reply
-                .body()
-                .deserialize()
-                .context("parse GetCurrentState")?;
-            // `spec.0` is the connector; "color-mode" 1 is META_COLOR_MODE_BT2100.
-            let heads: Vec<(&str, bool)> = monitors
-                .iter()
-                .map(|(spec, _modes, props)| {
-                    let hdr = props
-                        .get("color-mode")
-                        .and_then(|v| u32::try_from(v).ok())
-                        .is_some_and(|mode| mode == 1);
-                    (spec.0.as_str(), hdr)
-                })
-                .collect();
-            Ok(hdr_offer_for(
-                &heads,
-                pf_host_config::config().capture_monitor.as_deref(),
-            ))
-        })
-    };
-    match probe() {
-        Ok(hdr) => hdr,
-        Err(e) => {
-            tracing::debug!(error = %format!("{e:#}"), "GNOME HDR colour-mode probe failed — SDR");
-            false
-        }
-    }
-}
-
-/// Should this host offer the HDR (10-bit PQ) formats, given each head as `(connector, is_bt2100)`
-/// and the `PUNKTFUNK_CAPTURE_MONITOR` pin?
-///
-/// Pinned: only that head's colour mode counts — an HDR-capable neighbour must not talk the host
-/// into offering PQ for the SDR panel it is actually streaming. A pin naming no live head reports
-/// SDR rather than falling back to "any": the session is about to fail on that same missing
-/// monitor, and an over-claimed HDR offer would be a second, quieter wrong answer.
-/// Unpinned: the pre-existing "any monitor is in HDR mode" heuristic, unchanged.
-fn hdr_offer_for(heads: &[(&str, bool)], pinned: Option<&str>) -> bool {
-    match pinned {
-        Some(want) => heads
-            .iter()
-            .find(|(connector, _)| connector.eq_ignore_ascii_case(want))
-            .is_some_and(|(_, hdr)| *hdr),
-        None => heads.iter().any(|(_, hdr)| *hdr),
-    }
-}
-
-/// Pick the ScreenCast cursor mode from what the backend advertises (`AvailableCursorModes`).
-/// With `want_metadata` the ladder prefers **cursor-as-metadata**: the compositor keeps its cheap
-/// hardware cursor plane and ships the pointer as PipeWire `SPA_META_Cursor` metadata (position +
-/// an occasional bitmap), which the consumer composites itself — avoiding the producer burning the
-/// cursor into every frame (`Embedded`), which on gamescope would defeat its HW cursor plane.
-/// Without it — the session's encode path has no compositing stage for a metadata cursor
-/// (`pf-encode`'s `cursor_blend_capable` said the resolved backend can't blend) — the ladder
-/// prefers `Embedded`, so the pointer is in the pixels instead of in metadata nothing would draw.
-/// Both ladders fall through to the other mode, then `Hidden`; a failed property query (an older
-/// portal) keeps the prior `Embedded` behavior so the cursor is never silently lost.
-async fn choose_cursor_mode(
-    proxy: &ashpd::desktop::screencast::Screencast,
-    want_metadata: bool,
-) -> ashpd::desktop::screencast::CursorMode {
-    use ashpd::desktop::screencast::CursorMode;
-    match proxy.available_cursor_modes().await {
-        Ok(avail) if want_metadata && avail.contains(CursorMode::Metadata) => {
-            tracing::info!(
-                ?avail,
-                "ScreenCast: requesting cursor-as-metadata (SPA_META_Cursor)"
-            );
-            CursorMode::Metadata
-        }
-        Ok(avail) if avail.contains(CursorMode::Embedded) => {
-            if want_metadata {
-                tracing::info!(
-                    ?avail,
-                    "ScreenCast: cursor metadata unavailable — requesting Embedded cursor"
-                );
-            } else {
-                tracing::info!(
-                    ?avail,
-                    "ScreenCast: requesting Embedded cursor (this session's encoder does not \
-                     composite a metadata cursor)"
-                );
-            }
-            CursorMode::Embedded
-        }
-        Ok(avail) if avail.contains(CursorMode::Metadata) => {
-            // Embedded wanted but not offered. Metadata still beats Hidden: the CPU capture
-            // path composites `SPA_META_Cursor` inline, so part of the matrix keeps a pointer.
-            tracing::warn!(
-                ?avail,
-                "ScreenCast: Embedded cursor not advertised — requesting cursor-as-metadata \
-                 (only CPU-path frames will composite it)"
-            );
-            CursorMode::Metadata
-        }
-        Ok(avail) => {
-            tracing::warn!(
-                ?avail,
-                "ScreenCast: neither Metadata nor Embedded cursor advertised — cursor will be hidden"
-            );
-            CursorMode::Hidden
-        }
-        Err(e) => {
-            tracing::warn!(
-                error = %e,
-                "ScreenCast: AvailableCursorModes query failed — defaulting to Embedded cursor"
-            );
-            CursorMode::Embedded
-        }
-    }
-}
-
-/// The portal handshake: connect ScreenCast, select a single monitor, start, open the
-/// PipeWire remote, hand the fd + node id back, then keep the session alive until `quit_rx`
-/// resolves (the capturer's `Drop` — see [`PortalSession`]).
-pub(super) fn portal_thread(
-    setup_tx: std::sync::mpsc::Sender<Result<(OwnedFd, u32), String>>,
-    quit_rx: tokio::sync::oneshot::Receiver<()>,
-    want_metadata_cursor: bool,
-) {
-    use ashpd::desktop::screencast::{Screencast, SelectSourcesOptions, SourceType};
-    use ashpd::desktop::PersistMode;
-    use ashpd::enumflags2::BitFlags;
-
-    // Multi-thread runtime: the zbus connection's background reader must be pumped
-    // continuously across the create_session → select_sources → start handshake, or the
-    // portal reports "Invalid session". (A current-thread runtime starves it.)
-    let rt = match tokio::runtime::Builder::new_multi_thread()
-        .worker_threads(2)
-        .enable_all()
-        .build()
-    {
-        Ok(rt) => rt,
-        Err(e) => {
-            let _ = setup_tx.send(Err(format!("build tokio runtime: {e}")));
-            return;
-        }
-    };
-    let err_tx = setup_tx.clone();
-
-    rt.block_on(async move {
-        let result: Result<()> = async {
-            let proxy = Screencast::new()
-                .await
-                .context("connect ScreenCast portal")?;
-            let session = proxy
-                .create_session(Default::default())
-                .await
-                .context("create_session")?;
-            let cursor_mode = choose_cursor_mode(&proxy, want_metadata_cursor).await;
-            proxy
-                .select_sources(
-                    &session,
-                    SelectSourcesOptions::default()
-                        .set_cursor_mode(cursor_mode)
-                        // Only MONITOR is offered by the wlroots backend
-                        // (AvailableSourceTypes=1); requesting unsupported types
-                        // invalidates the session.
-                        .set_sources(BitFlags::from_flag(SourceType::Monitor))
-                        .set_multiple(false)
-                        .set_persist_mode(PersistMode::DoNot),
-                )
-                .await
-                .context("select_sources")?
-                .response()
-                .context("select_sources rejected (unsupported source type / cursor mode?)")?;
-            let streams = proxy
-                .start(&session, None, Default::default())
-                .await
-                .context("start cast")?
-                .response()
-                .context("start response (chooser cancelled? portal misconfigured?)")?;
-            let stream = streams
-                .streams()
-                .first()
-                .context("portal returned no streams")?
-                .clone();
-            let node_id = stream.pipe_wire_node_id();
-            let fd = proxy
-                .open_pipe_wire_remote(&session, Default::default())
-                .await
-                .context("open_pipe_wire_remote")?;
-
-            setup_tx
-                .send(Ok((fd, node_id)))
-                .map_err(|_| anyhow!("capturer dropped before setup completed"))?;
-
-            // Keep `proxy` + `session` (and the underlying zbus connection) alive for the
-            // capture; the cast is torn down when the connection drops (ashpd's `Session`
-            // has no `Drop`) — which now happens when this park returns, not at process exit.
-            let _keep_alive = (&proxy, &session);
-            let _ = quit_rx.await;
-            Ok(())
-        }
-        .await;
-
-        if let Err(e) = result {
-            let _ = err_tx.send(Err(format!("{e:#}")));
-        }
-    });
-    // Drop the runtime HERE, before the caller signals completion: shutting the 2 workers down is
-    // what finishes releasing the zbus connection, so a `done` signal sent after this means the
-    // compositor-side session is really gone (see `PortalSession::drop`).
-    drop(rt);
-}
-
-/// Combined RemoteDesktop+ScreenCast portal setup (KWin/GNOME). ScreenCast sources are selected
-/// on a session created via RemoteDesktop, so a single RemoteDesktop `start` grant —
-/// pre-authorized headlessly via the `kde-authorized` permission, exactly like the libei input
-/// path — also covers screen capture, with no separate ScreenCast dialog (which has no such
-/// bypass). Yields the same PipeWire fd + node id as the standalone path; the consumer is
-/// identical, as is the `quit_rx` teardown park (see [`PortalSession`]).
-pub(super) fn portal_thread_remote_desktop(
-    setup_tx: std::sync::mpsc::Sender<Result<(OwnedFd, u32), String>>,
-    quit_rx: tokio::sync::oneshot::Receiver<()>,
-    want_metadata_cursor: bool,
-) {
-    use ashpd::desktop::remote_desktop::{DeviceType, RemoteDesktop, SelectDevicesOptions};
-    use ashpd::desktop::screencast::{Screencast, SelectSourcesOptions, SourceType};
-    use ashpd::desktop::PersistMode;
-    use ashpd::enumflags2::BitFlags;
-
-    let rt = match tokio::runtime::Builder::new_multi_thread()
-        .worker_threads(2)
-        .enable_all()
-        .build()
-    {
-        Ok(rt) => rt,
-        Err(e) => {
-            let _ = setup_tx.send(Err(format!("build tokio runtime: {e}")));
-            return;
-        }
-    };
-    let err_tx = setup_tx.clone();
-
-    rt.block_on(async move {
-        let result: Result<()> = async {
-            let remote = RemoteDesktop::new()
-                .await
-                .context("connect RemoteDesktop portal")?;
-            let screencast = Screencast::new()
-                .await
-                .context("connect ScreenCast portal")?;
-            let session = remote
-                .create_session(Default::default())
-                .await
-                .context("create RemoteDesktop session")?;
-            // RemoteDesktop requires a device selection; we never connect_to_eis on this session
-            // (input injection runs its own), but selecting devices is what makes `start` the
-            // RemoteDesktop grant the kde-authorized bypass covers.
-            remote
-                .select_devices(
-                    &session,
-                    SelectDevicesOptions::default()
-                        .set_devices(DeviceType::Keyboard | DeviceType::Pointer)
-                        .set_persist_mode(PersistMode::DoNot),
-                )
-                .await
-                .context("select_devices")?
-                .response()
-                .context("select_devices rejected")?;
-            let cursor_mode = choose_cursor_mode(&screencast, want_metadata_cursor).await;
-            screencast
-                .select_sources(
-                    &session,
-                    SelectSourcesOptions::default()
-                        .set_cursor_mode(cursor_mode)
-                        .set_sources(BitFlags::from_flag(SourceType::Monitor))
-                        .set_multiple(false)
-                        .set_persist_mode(PersistMode::DoNot),
-                )
-                .await
-                .context("select_sources")?
-                .response()
-                .context("select_sources rejected (unsupported source type?)")?;
-            let streams = remote
-                .start(&session, None, Default::default())
-                .await
-                .context("start RemoteDesktop+ScreenCast")?
-                .response()
-                .context("start response (grant not pre-authorized / headless dialog?)")?;
-            let stream = streams
-                .streams()
-                .first()
-                .context("portal returned no screencast streams")?
-                .clone();
-            let node_id = stream.pipe_wire_node_id();
-            let fd = screencast
-                .open_pipe_wire_remote(&session, Default::default())
-                .await
-                .context("open_pipe_wire_remote")?;
-
-            setup_tx
-                .send(Ok((fd, node_id)))
-                .map_err(|_| anyhow!("capturer dropped before setup completed"))?;
-
-            // Keep the proxies + session (and their zbus connection) alive for the capture, until
-            // the capturer's `Drop` fires the quit channel.
-            let _keep_alive = (&remote, &screencast, &session);
-            let _ = quit_rx.await;
-            Ok(())
-        }
-        .await;
-
-        if let Err(e) = result {
-            let _ = err_tx.send(Err(format!("{e:#}")));
-        }
-    });
-    // See `portal_thread`: drop the runtime before the caller's completion signal.
-    drop(rt);
-}
-
-#[cfg(test)]
-mod hdr_offer_tests {
-    use super::hdr_offer_for;
-
-    #[test]
-    fn unpinned_keeps_the_any_monitor_heuristic() {
-        assert!(hdr_offer_for(&[("DP-1", false), ("HDMI-A-1", true)], None));
-        assert!(!hdr_offer_for(&[("DP-1", false)], None));
-    }
-
-    /// The regression this exists to prevent: an HDR TV on HDMI while the pinned head is an SDR
-    /// desk monitor. Before scoping, the host offered PQ formats for a panel that can't show them.
-    #[test]
-    fn a_pin_ignores_an_hdr_neighbour() {
-        let heads = [("DP-1", false), ("HDMI-A-1", true)];
-        assert!(!hdr_offer_for(&heads, Some("DP-1")));
-        assert!(hdr_offer_for(&heads, Some("HDMI-A-1")));
-    }
-
-    #[test]
-    fn a_pin_matches_case_insensitively_like_the_resolver() {
-        assert!(hdr_offer_for(&[("HDMI-A-1", true)], Some("hdmi-a-1")));
-    }
-
-    #[test]
-    fn a_pin_naming_no_live_head_reports_sdr() {
-        assert!(!hdr_offer_for(&[("DP-1", true)], Some("DP-9")));
-    }
-}
@@ -1,634 +0,0 @@
-//! Cursor-as-metadata: the `SPA_META_Cursor` parser and the CPU-path composite blits.
-//!
-//! Split out of `linux/pipewire.rs` (sweep Phase 5.2). Both halves are producer-driven and
-//! bounds-critical: [`update_cursor_meta`] reads a bitmap at offsets the COMPOSITOR chose (its own
-//! SAFETY proof notes that a missing bound SIGSEGVs inside the PipeWire `.process` callback, where
-//! `catch_unwind` cannot help), and the `composite_cursor*` blits clip a caller-positioned bitmap
-//! into a frame buffer. Separating them from the stream machinery is what makes them testable
-//! without a compositor.
-
-use super::PixelFormat;
-use pipewire as pw;
-use pw::spa;
-use std::sync::Arc;
-
-/// Latest cursor state parsed from `SPA_META_Cursor` (cursor-as-metadata mode). Position is
-/// refreshed every buffer that carries the meta (including Mutter's cursor-only "corrupted"
-/// buffers we otherwise skip for their stale frame); the RGBA bitmap is cached and only
-/// replaced when the compositor sends a fresh one (`bitmap_offset != 0`).
-#[derive(Default)]
-pub(super) struct CursorState {
-    /// True when the compositor reports a visible pointer (`spa_meta_cursor.id != 0`).
-    visible: bool,
-    /// Top-left where the bitmap is drawn = reported position − hotspot.
-    x: i32,
-    y: i32,
-    /// Cached straight-alpha RGBA pixels (`bw*bh*4`, bytes R,G,B,A). `Arc` so the overlay handed
-    /// to each GPU frame is a refcount bump, not a copy. Empty until the first bitmap arrives.
-    rgba: Arc<Vec<u8>>,
-    bw: u32,
-    bh: u32,
-    /// Bumps whenever the bitmap (`rgba`/`bw`/`bh`) changes — stable across position-only moves,
-    /// so the GPU encoder re-uploads its cursor texture only on change.
-    serial: u64,
-    /// The compositor-reported hotspot — carried on the overlay for the cursor-forward
-    /// channel (the blend path uses the pre-adjusted `x`/`y` and never reads it).
-    hot_x: i32,
-    hot_y: i32,
-}
-
-impl CursorState {
-    /// A shareable overlay for the encode/forward paths, or `None` before the first bitmap
-    /// arrived. A HIDDEN pointer still yields `Some` (with `visible: false`): the
-    /// cursor-forward channel needs "known but hidden" — an app grabbed the pointer, the
-    /// client's relative-mode hint (M3) — which is a different fact from "no cursor yet".
-    /// The encode loop strips invisible overlays before any blend path sees the frame.
-    /// Cheap: clones an `Arc` + a few scalars.
-    pub(super) fn overlay(&self) -> Option<pf_frame::CursorOverlay> {
-        if self.rgba.is_empty() {
-            return None;
-        }
-        Some(pf_frame::CursorOverlay {
-            x: self.x,
-            y: self.y,
-            w: self.bw,
-            h: self.bh,
-            rgba: self.rgba.clone(),
-            serial: self.serial,
-            hot_x: self.hot_x.max(0) as u32,
-            hot_y: self.hot_y.max(0) as u32,
-            visible: self.visible,
-        })
-    }
-}
-
-/// Extract straight (R,G,B,A) from one 4-byte cursor-bitmap pixel, honoring the bitmap's SPA
-/// video format (portals emit RGBA or BGRA; ARGB/ABGR handled for completeness). Unknown
-/// 4-byte formats are read as RGBA.
-pub(super) fn decode_bitmap_pixel(vfmt: u32, s: &[u8]) -> (u8, u8, u8, u8) {
-    match vfmt {
-        x if x == spa::sys::SPA_VIDEO_FORMAT_RGBA => (s[0], s[1], s[2], s[3]),
-        x if x == spa::sys::SPA_VIDEO_FORMAT_BGRA => (s[2], s[1], s[0], s[3]),
-        x if x == spa::sys::SPA_VIDEO_FORMAT_ARGB => (s[1], s[2], s[3], s[0]),
-        x if x == spa::sys::SPA_VIDEO_FORMAT_ABGR => (s[3], s[2], s[1], s[0]),
-        _ => (s[0], s[1], s[2], s[3]),
-    }
-}
-
-/// Update `cursor` from the newest buffer's `SPA_META_Cursor` (no-op when the buffer carries no
-/// cursor meta — producer doesn't support it, or the portal isn't in Metadata cursor mode).
-/// Called for EVERY dequeued buffer, before the stale-frame skip, so pointer-only movements
-/// (which Mutter delivers as metadata-only "corrupted" buffers) still refresh the position.
-pub(super) fn update_cursor_meta(cursor: &mut CursorState, spa_buf: *mut spa::sys::spa_buffer) {
-    // SAFETY: `spa_buf` is the live buffer we still hold (dequeued, not yet requeued).
-    // `spa_buffer_find_meta` returns the `spa_meta` (type + byte `size` + `data` pointer) for
-    // `SPA_META_Cursor`, or null. We take `find_meta` rather than `find_meta_data` specifically
-    // to obtain the region's real `size`: the bitmap offset, pixel offset and stride read below
-    // are ALL producer-written, and without a bound against the actual region they drive
-    // out-of-bounds pointer arithmetic and an oversized `slice::from_raw_parts` — an OOB read
-    // that SIGSEGVs inside the PipeWire `.process` callback (a segfault `catch_unwind` cannot
-    // catch). Every offset below is validated against `region_size` with checked arithmetic,
-    // mirroring the fd-length guard the main frame path already applies to xdg-desktop-portal-wlr.
-    let meta = unsafe { spa::sys::spa_buffer_find_meta(spa_buf, spa::sys::SPA_META_Cursor) };
-    if meta.is_null() {
-        return;
-    }
-    // SAFETY: `meta` is non-null and points into the held buffer's metadata array.
-    let (region_size, data) = unsafe { ((*meta).size as usize, (*meta).data as *const u8) };
-    if data.is_null() || region_size < std::mem::size_of::<spa::sys::spa_meta_cursor>() {
-        return;
-    }
-    let cur = data as *const spa::sys::spa_meta_cursor;
-    // SAFETY: `region_size >= size_of::<spa_meta_cursor>()` checked above, so every field is in bounds.
-    let (id, pos_x, pos_y, hot_x, hot_y, bmp_off) = unsafe {
-        (
-            (*cur).id,
-            (*cur).position.x,
-            (*cur).position.y,
-            (*cur).hotspot.x,
-            (*cur).hotspot.y,
-            (*cur).bitmap_offset,
-        )
-    };
-    if id == 0 {
-        // SPA contract: id 0 = "no cursor information", NOT "cursor hidden". Mutter only
-        // REWRITES a buffer's meta region when the cursor changed, so recycled buffers
-        // between damage frames carry a stale id-0 meta — treating that as hidden flickered
-        // the cursor off between hovers (on-glass round 5). Keep the last-known state; a
-        // pointer that really left/hid simply stops producing updates. (The M3 hidden hint
-        // loses its Mutter signal — Windows has its own CURSOR_SUPPRESSED source.)
-        return;
-    }
-    cursor.visible = true;
-    cursor.x = pos_x - hot_x;
-    cursor.y = pos_y - hot_y;
-    cursor.hot_x = hot_x;
-    cursor.hot_y = hot_y;
-    if bmp_off == 0 {
-        // Position-only update — keep the cached bitmap.
-        return;
-    }
-    let bmp_off = bmp_off as usize;
-    // The `spa_meta_bitmap` header must fit entirely inside the region before we read it —
-    // `bitmap_offset` is producer-controlled and otherwise reads past the metadata.
-    match bmp_off.checked_add(std::mem::size_of::<spa::sys::spa_meta_bitmap>()) {
-        Some(end) if end <= region_size => {}
-        _ => return,
-    }
-    // SAFETY: `bmp_off + size_of::<spa_meta_bitmap>() <= region_size` (checked directly above),
-    // so the header is fully in bounds for a read of that many bytes. `read_unaligned` is
-    // REQUIRED, not defensive: `bmp_off` is producer-written and nothing in the SPA contract or
-    // in this function establishes that `data + bmp_off` meets `spa_meta_bitmap`'s alignment —
-    // the previous field reads through an aligned `*const` asserted an invariant the code never
-    // proved. The struct is `Copy` POD, so one unaligned read yields an owned, aligned local.
-    let bmp = unsafe { (data.add(bmp_off) as *const spa::sys::spa_meta_bitmap).read_unaligned() };
-    let (vfmt, bw, bh, stride, pix_off) = (
-        bmp.format,
-        bmp.size.width,
-        bmp.size.height,
-        bmp.stride.max(0) as usize,
-        bmp.offset as usize,
-    );
-    // Ignore empty or implausibly large bitmaps (the meta-size request covers <= 1024×1024;
-    // real cursors are ≤96px — the cursor channel downscales >120px for the wire anyway).
-    if bw == 0 || bh == 0 || bw > 1024 || bh > 1024 {
-        return;
-    }
-    let row = bw as usize * 4;
-    let stride = if stride < row { row } else { stride };
-    let Some(extent) = bitmap_extent(bmp_off, pix_off, stride, row, bh as usize, region_size)
-    else {
-        return;
-    };
-    // SAFETY: `bitmap_extent` returned `Some`, which means (see its contract) the whole range
-    // `[bmp_off + pix_off, +len)` lies inside `region_size` and `len` is EXACTLY the extent the
-    // strided loop below reads. `data` is the producer's meta-region base, live for this callback.
-    let src = unsafe { std::slice::from_raw_parts(data.add(extent.start), extent.len()) };
-    let mut rgba = vec![0u8; bw as usize * bh as usize * 4];
-    for y in 0..bh as usize {
-        for x in 0..bw as usize {
-            let so = y * stride + x * 4;
-            let (r, g, b, a) = decode_bitmap_pixel(vfmt, &src[so..so + 4]);
-            let d = (y * bw as usize + x) * 4;
-            rgba[d] = r;
-            rgba[d + 1] = g;
-            rgba[d + 2] = b;
-            rgba[d + 3] = a;
-        }
-    }
-    cursor.rgba = Arc::new(rgba);
-    cursor.bw = bw;
-    cursor.bh = bh;
-    cursor.serial = cursor.serial.wrapping_add(1);
-}
-
-/// The byte range inside the producer's cursor-meta region that a `bh`-row, `row`-wide,
-/// `stride`-strided bitmap at `bmp_off + pix_off` occupies — or `None` when it does not fit, or when
-/// any of the arithmetic overflows.
-///
-/// THE bound on `update_cursor_meta`. Every input except `region_size` is producer-written, and
-/// `region_size` is the real byte size of the meta region libspa handed us (which is why the caller
-/// takes `spa_buffer_find_meta` rather than `find_meta_data`). Without this check the offsets drive
-/// out-of-bounds pointer arithmetic and an oversized `slice::from_raw_parts` — an OOB read that
-/// SIGSEGVs inside the PipeWire `.process` callback, where `catch_unwind` cannot help. A stride near
-/// `i32::MAX` is enough to overflow the multiply on its own, so every step is checked.
-///
-/// `len()` of the returned range is EXACTLY `stride·(bh−1) + row`: the last row contributes only its
-/// `row` visible bytes, not a full stride, so a bitmap that ends flush against the region's end is
-/// accepted rather than rejected by a padding byte that is never read.
-///
-/// Extracted (sweep Phase 6.1) purely so it can be tested — the caller is unreachable without a live
-/// compositor.
-fn bitmap_extent(
-    bmp_off: usize,
-    pix_off: usize,
-    stride: usize,
-    row: usize,
-    bh: usize,
-    region_size: usize,
-) -> Option<std::ops::Range<usize>> {
-    if bh == 0 || row == 0 || stride < row {
-        return None;
-    }
-    let span = stride.checked_mul(bh - 1)?.checked_add(row)?;
-    let start = bmp_off.checked_add(pix_off)?;
-    let end = start.checked_add(span)?;
-    (end <= region_size).then_some(start..end)
-}
-
-/// Destination channel byte offsets (R,G,B) and bytes-per-pixel for a packed-RGB `PixelFormat`,
-/// or `None` for a layout the CPU cursor blit doesn't handle (YUV/10-bit — those never reach
-/// the CPU de-pad path anyway).
-pub(super) fn dst_offsets(fmt: PixelFormat) -> Option<(usize, usize, usize, usize)> {
-    Some(match fmt {
-        PixelFormat::Bgrx | PixelFormat::Bgra => (2, 1, 0, 4),
-        PixelFormat::Rgbx | PixelFormat::Rgba => (0, 1, 2, 4),
-        PixelFormat::Rgb => (0, 1, 2, 3),
-        PixelFormat::Bgr => (2, 1, 0, 3),
-        _ => return None,
-    })
-}
-
-/// Alpha-blend the cached cursor bitmap into a packed 10-bit (`X2Rgb10`/`X2Bgr10`) CPU frame:
-/// unpack each u32, blend the 8-bit cursor channels scaled to 10 bits (`v<<2 | v>>6`), repack.
-/// The frame samples are PQ-encoded, so like the 8-bit gamma-space blend this is a display-
-/// referred approximation — fine for a cursor. `r_shift` is the R channel's bit offset (20 for
-/// x:R:G:B, 0 for x:B:G:R); G is always at 10 and B mirrors R.
-pub(super) fn composite_cursor_rgb10(
-    tight: &mut [u8],
-    w: usize,
-    h: usize,
-    r_shift: u32,
-    cursor: &CursorState,
-) {
-    let b_shift = 20 - r_shift; // 0 or 20 — the opposite end from R
-    let (bw, bh) = (cursor.bw as i32, cursor.bh as i32);
-    for cy in 0..bh {
-        let dy = cursor.y + cy;
-        if dy < 0 || dy as usize >= h {
-            continue;
-        }
-        for cx in 0..bw {
-            let dx = cursor.x + cx;
-            if dx < 0 || dx as usize >= w {
-                continue;
-            }
-            let s = ((cy * bw + cx) as usize) * 4;
-            let a = cursor.rgba[s + 3] as u32;
-            if a == 0 {
-                continue;
-            }
-            // 8-bit cursor channel → 10-bit (replicate the top bits into the bottom).
-            let up10 = |v: u8| ((v as u32) << 2) | ((v as u32) >> 6);
-            let (sr, sg, sb) = (
-                up10(cursor.rgba[s]),
-                up10(cursor.rgba[s + 1]),
-                up10(cursor.rgba[s + 2]),
-            );
-            let di = (dy as usize * w + dx as usize) * 4;
-            let px = u32::from_le_bytes(tight[di..di + 4].try_into().unwrap());
-            let blend = |dst: u32, src: u32| (src * a + dst * (255 - a)) / 255;
-            let dr = blend((px >> r_shift) & 0x3ff, sr);
-            let dg = blend((px >> 10) & 0x3ff, sg);
-            let db = blend((px >> b_shift) & 0x3ff, sb);
-            let out = (px & 0xc000_0000) | (dr << r_shift) | (dg << 10) | (db << b_shift);
-            tight[di..di + 4].copy_from_slice(&out.to_le_bytes());
-        }
-    }
-}
-
-/// Alpha-blend the cached cursor bitmap into the tightly-packed CPU frame at its latched
-/// position. Cheap: a straight-alpha blit over at most ~256×256 pixels, clipped to the frame —
-/// the whole point of cursor-as-metadata (no forced full-frame composite on the producer).
-pub(super) fn composite_cursor(
-    tight: &mut [u8],
-    w: usize,
-    h: usize,
-    fmt: PixelFormat,
-    cursor: &CursorState,
-) {
-    if !cursor.visible || cursor.rgba.is_empty() {
-        return;
-    }
-    // The packed 10-bit HDR layouts blend via bit unpack/repack, not byte offsets.
-    match fmt {
-        PixelFormat::X2Rgb10 => return composite_cursor_rgb10(tight, w, h, 20, cursor),
-        PixelFormat::X2Bgr10 => return composite_cursor_rgb10(tight, w, h, 0, cursor),
-        _ => {}
-    }
-    let Some((ri, gi, bi, bpp)) = dst_offsets(fmt) else {
-        return;
-    };
-    let (bw, bh) = (cursor.bw as i32, cursor.bh as i32);
-    for cy in 0..bh {
-        let dy = cursor.y + cy;
-        if dy < 0 || dy as usize >= h {
-            continue;
-        }
-        for cx in 0..bw {
-            let dx = cursor.x + cx;
-            if dx < 0 || dx as usize >= w {
-                continue;
-            }
-            let s = ((cy * bw + cx) as usize) * 4;
-            let a = cursor.rgba[s + 3] as u32;
-            if a == 0 {
-                continue;
-            }
-            let (sr, sg, sb) = (
-                cursor.rgba[s] as u32,
-                cursor.rgba[s + 1] as u32,
-                cursor.rgba[s + 2] as u32,
-            );
-            let di = (dy as usize * w + dx as usize) * bpp;
-            let blend = |dst: u8, src: u32| ((src * a + dst as u32 * (255 - a)) / 255) as u8;
-            tight[di + ri] = blend(tight[di + ri], sr);
-            tight[di + gi] = blend(tight[di + gi], sg);
-            tight[di + bi] = blend(tight[di + bi], sb);
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// A solid-colour cursor state at `(x, y)`, `w`×`h`, alpha `a`.
-    fn cursor(x: i32, y: i32, w: u32, h: u32, rgb: (u8, u8, u8), a: u8) -> CursorState {
-        let mut px = Vec::with_capacity((w * h * 4) as usize);
-        for _ in 0..w * h {
-            px.extend_from_slice(&[rgb.0, rgb.1, rgb.2, a]);
-        }
-        CursorState {
-            visible: true,
-            x,
-            y,
-            rgba: Arc::new(px),
-            bw: w,
-            bh: h,
-            serial: 1,
-            hot_x: 0,
-            hot_y: 0,
-        }
-    }
-
-    // ---- bitmap_extent: the guard whose absence SIGSEGVs uncatchably -------------------------
-
-    #[test]
-    fn bitmap_extent_accepts_a_bitmap_that_fits() {
-        // 4×2 RGBA, tightly packed: 32 bytes at offset 0.
-        assert_eq!(bitmap_extent(0, 0, 16, 16, 2, 32), Some(0..32));
-        // …and the same bitmap behind a header + pixel offset.
-        assert_eq!(bitmap_extent(24, 8, 16, 16, 2, 64), Some(32..64));
-    }
-
-    #[test]
-    fn bitmap_extent_charges_the_last_row_only_its_visible_bytes() {
-        // stride 32, row 16, 3 rows ⇒ 32*2 + 16 = 80, NOT 96. A bitmap ending flush against the
-        // region must be accepted: the trailing stride padding is never read.
-        assert_eq!(bitmap_extent(0, 0, 32, 16, 3, 80), Some(0..80));
-        assert_eq!(bitmap_extent(0, 0, 32, 16, 3, 79), None, "one byte short");
-    }
-
-    #[test]
-    fn bitmap_extent_rejects_anything_past_the_region() {
-        assert_eq!(bitmap_extent(0, 0, 16, 16, 2, 31), None);
-        // An offset alone can push it out.
-        assert_eq!(bitmap_extent(1, 0, 16, 16, 2, 32), None);
-        assert_eq!(bitmap_extent(0, 1, 16, 16, 2, 32), None);
-        // A region of zero accepts nothing.
-        assert_eq!(bitmap_extent(0, 0, 16, 16, 1, 0), None);
-    }
-
-    /// The producer picks `stride` and both offsets, so each is an overflow vector on its own.
-    #[test]
-    fn bitmap_extent_survives_hostile_arithmetic() {
-        // stride × (bh-1) overflows.
-        assert_eq!(bitmap_extent(0, 0, usize::MAX, 16, 3, usize::MAX), None);
-        // span + row overflows. Needs ≥2 rows so `stride·(bh−1)` is already at the ceiling: with a
-        // SINGLE row `stride·0 == 0`, and even a `usize::MAX`-wide row is then arithmetically in
-        // range — which is correct rather than a miss, since the caller has already capped `bw` at
-        // 1024 and `row` is therefore ≤ 4096.
-        assert_eq!(
-            bitmap_extent(0, 0, usize::MAX, usize::MAX, 2, usize::MAX),
-            None
-        );
-        // bmp_off + pix_off overflows.
-        assert_eq!(bitmap_extent(usize::MAX, 1, 16, 16, 1, usize::MAX), None);
-        // start + span overflows.
-        assert_eq!(
-            bitmap_extent(usize::MAX - 8, 0, 16, 16, 1, usize::MAX),
-            None
-        );
-        // A near-i32::MAX stride — the case the SAFETY comment calls out — must not wrap.
-        assert_eq!(bitmap_extent(0, 0, i32::MAX as usize, 16, 1024, 4096), None);
-    }
-
-    #[test]
-    fn bitmap_extent_rejects_degenerate_geometry() {
-        assert_eq!(bitmap_extent(0, 0, 16, 16, 0, 4096), None, "zero rows");
-        assert_eq!(bitmap_extent(0, 0, 16, 0, 2, 4096), None, "zero-width row");
-        assert_eq!(bitmap_extent(0, 0, 8, 16, 2, 4096), None, "stride < row");
-    }
-
-    // ---- composite_cursor: clipping, alpha, and every layout --------------------------------
-
-    /// Read pixel `(x, y)`'s (R, G, B) out of a packed frame, honouring the layout's byte order.
-    fn px_rgb(buf: &[u8], w: usize, x: usize, y: usize, fmt: PixelFormat) -> (u8, u8, u8) {
-        let (ri, gi, bi, bpp) = dst_offsets(fmt).expect("packed layout");
-        let i = (y * w + x) * bpp;
-        (buf[i + ri], buf[i + gi], buf[i + bi])
-    }
-
-    #[test]
-    fn every_packed_layout_lands_the_colour_in_its_own_channels() {
-        for fmt in [
-            PixelFormat::Bgrx,
-            PixelFormat::Bgra,
-            PixelFormat::Rgbx,
-            PixelFormat::Rgba,
-            PixelFormat::Rgb,
-            PixelFormat::Bgr,
-        ] {
-            let bpp = dst_offsets(fmt).unwrap().3;
-            let (w, h) = (4usize, 4usize);
-            let mut buf = vec![0u8; w * h * bpp];
-            // Opaque pure red at (1, 1).
-            composite_cursor(&mut buf, w, h, fmt, &cursor(1, 1, 1, 1, (255, 0, 0), 255));
-            assert_eq!(px_rgb(&buf, w, 1, 1, fmt), (255, 0, 0), "{fmt:?}");
-            // Nothing else moved.
-            assert_eq!(px_rgb(&buf, w, 0, 0, fmt), (0, 0, 0), "{fmt:?}");
-            assert_eq!(px_rgb(&buf, w, 2, 1, fmt), (0, 0, 0), "{fmt:?}");
-        }
-    }
-
-    #[test]
-    fn a_cursor_hanging_off_every_edge_is_clipped_not_wrapped() {
-        let (w, h, fmt) = (4usize, 4usize, PixelFormat::Bgrx);
-        // Top-left: only the bottom-right quarter of a 2×2 lands, at (0, 0).
-        let mut buf = vec![0u8; w * h * 4];
-        composite_cursor(
-            &mut buf,
-            w,
-            h,
-            fmt,
-            &cursor(-1, -1, 2, 2, (10, 20, 30), 255),
-        );
-        assert_eq!(px_rgb(&buf, w, 0, 0, fmt), (10, 20, 30));
-        assert_eq!(px_rgb(&buf, w, 1, 0, fmt), (0, 0, 0));
-        assert_eq!(px_rgb(&buf, w, 0, 1, fmt), (0, 0, 0));
-        // Bottom-right: only the top-left quarter lands, at (3, 3).
-        let mut buf = vec![0u8; w * h * 4];
-        composite_cursor(&mut buf, w, h, fmt, &cursor(3, 3, 2, 2, (10, 20, 30), 255));
-        assert_eq!(px_rgb(&buf, w, 3, 3, fmt), (10, 20, 30));
-        assert_eq!(px_rgb(&buf, w, 2, 3, fmt), (0, 0, 0));
-        // Fully outside in each direction: the frame is untouched.
-        for pos in [(-2, 0), (0, -2), (4, 0), (0, 4), (-9, -9), (99, 99)] {
-            let mut buf = vec![0u8; w * h * 4];
-            composite_cursor(
-                &mut buf,
-                w,
-                h,
-                fmt,
-                &cursor(pos.0, pos.1, 2, 2, (255, 255, 255), 255),
-            );
-            assert!(buf.iter().all(|&b| b == 0), "drew something at {pos:?}");
-        }
-    }
-
-    #[test]
-    fn transparent_and_hidden_cursors_draw_nothing() {
-        let (w, h, fmt) = (2usize, 2usize, PixelFormat::Bgrx);
-        // Alpha 0 — every pixel skipped.
-        let mut buf = vec![0u8; w * h * 4];
-        composite_cursor(&mut buf, w, h, fmt, &cursor(0, 0, 2, 2, (255, 255, 255), 0));
-        assert!(buf.iter().all(|&b| b == 0));
-        // `visible: false` — the whole blit is skipped.
-        let mut c = cursor(0, 0, 2, 2, (255, 255, 255), 255);
-        c.visible = false;
-        let mut buf = vec![0u8; w * h * 4];
-        composite_cursor(&mut buf, w, h, fmt, &c);
-        assert!(buf.iter().all(|&b| b == 0));
-        // No bitmap yet — likewise.
-        let mut c = cursor(0, 0, 2, 2, (255, 255, 255), 255);
-        c.rgba = Arc::new(Vec::new());
-        let mut buf = vec![0u8; w * h * 4];
-        composite_cursor(&mut buf, w, h, fmt, &c);
-        assert!(buf.iter().all(|&b| b == 0));
-    }
-
-    #[test]
-    fn half_alpha_blends_toward_the_destination() {
-        let (w, h, fmt) = (1usize, 1usize, PixelFormat::Bgrx);
-        // dst = white, src = black at 50% ⇒ mid grey (integer blend: (0*128 + 255*127)/255 = 127).
-        let mut buf = vec![255u8; w * h * 4];
-        composite_cursor(&mut buf, w, h, fmt, &cursor(0, 0, 1, 1, (0, 0, 0), 128));
-        assert_eq!(px_rgb(&buf, w, 0, 0, fmt), (127, 127, 127));
-    }
-
-    /// A layout the CPU blit cannot address must be declined, not mis-blitted.
-    #[test]
-    fn unsupported_layouts_are_declined() {
-        assert!(dst_offsets(PixelFormat::Nv12).is_none());
-        assert!(dst_offsets(PixelFormat::Yuv444).is_none());
-        let (w, h) = (2usize, 2usize);
-        let mut buf = vec![0u8; w * h * 4];
-        composite_cursor(
-            &mut buf,
-            w,
-            h,
-            PixelFormat::Nv12,
-            &cursor(0, 0, 2, 2, (255, 255, 255), 255),
-        );
-        assert!(buf.iter().all(|&b| b == 0), "NV12 must not be blitted");
-    }
-
-    // ---- composite_cursor_rgb10: the 10-bit unpack/repack round trip -------------------------
-
-    /// Pack an `x:R:G:B` (`X2Rgb10`) pixel — R at bit 20, G at 10, B at 0 — the way a producer does.
-    fn pack_x2rgb10(r: u32, g: u32, b: u32) -> [u8; 4] {
-        (0xC000_0000 | (r << 20) | (g << 10) | b).to_le_bytes()
-    }
-
-    #[test]
-    fn the_10bit_path_round_trips_an_untouched_pixel() {
-        // Alpha 0 ⇒ the blend is skipped entirely, so the packed pixel must come back bit-identical
-        // (including the top two bits, which are alpha and must survive the repack).
-        for (r, g, b) in [(0, 0, 0), (1023, 1023, 1023), (940, 64, 512), (1, 2, 3)] {
-            let src = pack_x2rgb10(r, g, b);
-            let mut buf = src.to_vec();
-            composite_cursor(
-                &mut buf,
-                1,
-                1,
-                PixelFormat::X2Rgb10,
-                &cursor(0, 0, 1, 1, (255, 255, 255), 0),
-            );
-            assert_eq!(buf, src, "({r},{g},{b}) was modified by a zero-alpha blend");
-        }
-    }
-
-    #[test]
-    fn the_10bit_path_writes_the_right_channel_at_the_right_shift() {
-        // Opaque pure red, 8-bit 255 → 10-bit 1023 (the `v<<2 | v>>6` expansion).
-        let mut buf = pack_x2rgb10(0, 0, 0).to_vec();
-        composite_cursor(
-            &mut buf,
-            1,
-            1,
-            PixelFormat::X2Rgb10,
-            &cursor(0, 0, 1, 1, (255, 0, 0), 255),
-        );
-        let v = u32::from_le_bytes(buf[..4].try_into().unwrap());
-        assert_eq!((v >> 20) & 0x3ff, 1023, "R");
-        assert_eq!((v >> 10) & 0x3ff, 0, "G");
-        assert_eq!(v & 0x3ff, 0, "B");
-        assert_eq!(v & 0xc000_0000, 0xc000_0000, "alpha bits preserved");
-
-        // X2Bgr10 puts R at bit 0 and B at 20 — the SAME cursor must land in the other end.
-        let mut buf = pack_x2rgb10(0, 0, 0).to_vec();
-        composite_cursor(
-            &mut buf,
-            1,
-            1,
-            PixelFormat::X2Bgr10,
-            &cursor(0, 0, 1, 1, (255, 0, 0), 255),
-        );
-        let v = u32::from_le_bytes(buf[..4].try_into().unwrap());
-        assert_eq!(v & 0x3ff, 1023, "R at bit 0 for x:B:G:R");
-        assert_eq!((v >> 20) & 0x3ff, 0, "B untouched");
-    }
-
-    #[test]
-    fn the_10bit_path_clips_like_the_8bit_one() {
-        let (w, h) = (2usize, 2usize);
-        let mut buf: Vec<u8> = (0..w * h).flat_map(|_| pack_x2rgb10(0, 0, 0)).collect();
-        let before = buf.clone();
-        // Entirely off-frame.
-        composite_cursor(
-            &mut buf,
-            w,
-            h,
-            PixelFormat::X2Rgb10,
-            &cursor(-5, -5, 2, 2, (255, 255, 255), 255),
-        );
-        assert_eq!(buf, before);
-        // Straddling the top-left corner: only (0, 0) is written.
-        composite_cursor(
-            &mut buf,
-            w,
-            h,
-            PixelFormat::X2Rgb10,
-            &cursor(-1, -1, 2, 2, (255, 255, 255), 255),
-        );
-        let p0 = u32::from_le_bytes(buf[0..4].try_into().unwrap());
-        let p1 = u32::from_le_bytes(buf[4..8].try_into().unwrap());
-        assert_eq!((p0 >> 20) & 0x3ff, 1023);
-        assert_eq!((p1 >> 20) & 0x3ff, 0);
-    }
-
-    // ---- decode_bitmap_pixel: the producer's byte order ------------------------------------
-
-    #[test]
-    fn each_bitmap_format_is_decoded_to_straight_rgba() {
-        let s = [1u8, 2, 3, 4];
-        assert_eq!(
-            decode_bitmap_pixel(spa::sys::SPA_VIDEO_FORMAT_RGBA, &s),
-            (1, 2, 3, 4)
-        );
-        assert_eq!(
-            decode_bitmap_pixel(spa::sys::SPA_VIDEO_FORMAT_BGRA, &s),
-            (3, 2, 1, 4)
-        );
-        assert_eq!(
-            decode_bitmap_pixel(spa::sys::SPA_VIDEO_FORMAT_ARGB, &s),
-            (2, 3, 4, 1)
-        );
-        assert_eq!(
-            decode_bitmap_pixel(spa::sys::SPA_VIDEO_FORMAT_ABGR, &s),
-            (4, 3, 2, 1)
-        );
-        // An unknown 4-byte format reads as RGBA rather than being rejected — documented behaviour.
-        assert_eq!(decode_bitmap_pixel(0xdead_beef, &s), (1, 2, 3, 4));
-    }
-}
@@ -1,515 +0,0 @@
-//! The PipeWire `EnumFormat` / `Buffers` / `Meta` param pods the capture stream offers, and the
-//! `Pod` serializer they all end in.
-//!
-//! Split out of `linux/pipewire.rs` (sweep Phase 5.2) because it is the crate's WIRE surface: what
-//! these builders put in a pod is what the compositor intersects against, and a missing property is
-//! not a compile error but a link that silently stalls in `negotiating`. Nothing here touches the
-//! stream, the buffers or the frames — every function is a pure `facts -> Vec<u8>`.
-
-use anyhow::{Context, Result};
-use pipewire as pw;
-use pw::spa;
-use spa::param::video::VideoFormat;
-
-pub(super) fn serialize_pod(obj: pw::spa::pod::Object) -> Result<Vec<u8>> {
-    Ok(pw::spa::pod::serialize::PodSerializer::serialize(
-        std::io::Cursor::new(Vec::new()),
-        &pw::spa::pod::Value::Object(obj),
-    )
-    .context("serialize pod")?
-    .0
-    .into_inner())
-}
-
-/// Build a LINEAR/modifier DMA-BUF `EnumFormat` pod. Packed BGRx is the existing import path;
-/// NV12 is gamescope's producer-side RGB→YUV path (opt-in during bring-up).
-pub(super) fn build_dmabuf_format(
-    format: VideoFormat,
-    modifiers: &[u64],
-    preferred: Option<(u32, u32, u32)>,
-) -> Result<Vec<u8>> {
-    let (dw, dh, dhz) = preferred.unwrap_or((1920, 1080, 60));
-    use pw::spa::param::format::{FormatProperties, MediaSubtype, MediaType};
-    let mut obj = pw::spa::pod::object!(
-        pw::spa::utils::SpaTypes::ObjectParamFormat,
-        pw::spa::param::ParamType::EnumFormat,
-        pw::spa::pod::property!(FormatProperties::MediaType, Id, MediaType::Video),
-        pw::spa::pod::property!(FormatProperties::MediaSubtype, Id, MediaSubtype::Raw),
-        pw::spa::pod::property!(FormatProperties::VideoFormat, Id, format),
-        pw::spa::pod::property!(
-            FormatProperties::VideoSize,
-            Choice,
-            Range,
-            Rectangle,
-            pw::spa::utils::Rectangle {
-                width: dw,
-                height: dh
-            },
-            pw::spa::utils::Rectangle {
-                width: 1,
-                height: 1
-            },
-            pw::spa::utils::Rectangle {
-                width: 8192,
-                height: 8192
-            }
-        ),
-        pw::spa::pod::property!(
-            FormatProperties::VideoFramerate,
-            Choice,
-            Range,
-            Fraction,
-            pw::spa::utils::Fraction { num: dhz, denom: 1 },
-            pw::spa::utils::Fraction { num: 0, denom: 1 },
-            pw::spa::utils::Fraction { num: 240, denom: 1 }
-        ),
-    );
-    if format == VideoFormat::NV12 {
-        obj.properties.push(pw::spa::pod::Property {
-            key: pw::spa::sys::SPA_FORMAT_VIDEO_colorMatrix,
-            flags: pw::spa::pod::PropertyFlags::MANDATORY,
-            value: pw::spa::pod::Value::Id(pw::spa::utils::Id(
-                pw::spa::sys::SPA_VIDEO_COLOR_MATRIX_BT709,
-            )),
-        });
-        obj.properties.push(pw::spa::pod::Property {
-            key: pw::spa::sys::SPA_FORMAT_VIDEO_colorRange,
-            flags: pw::spa::pod::PropertyFlags::MANDATORY,
-            value: pw::spa::pod::Value::Id(pw::spa::utils::Id(
-                pw::spa::sys::SPA_VIDEO_COLOR_RANGE_16_235,
-            )),
-        });
-    }
-    obj.properties.push(pw::spa::pod::Property {
-        key: pw::spa::sys::SPA_FORMAT_VIDEO_modifier,
-        flags: pw::spa::pod::PropertyFlags::MANDATORY,
-        value: pw::spa::pod::Value::Choice(pw::spa::pod::ChoiceValue::Long(
-            pw::spa::utils::Choice(
-                pw::spa::utils::ChoiceFlags::empty(),
-                pw::spa::utils::ChoiceEnum::Enum {
-                    default: modifiers[0] as i64,
-                    alternatives: modifiers.iter().map(|&m| m as i64).collect(),
-                },
-            ),
-        )),
-    });
-    serialize_pod(obj)
-}
-
-/// Build one GNOME 50+ HDR format pod: `format` (xRGB_210LE / xBGR_210LE) as a LINEAR-only
-/// dmabuf with **MANDATORY** BT.2020 primaries + SMPTE ST.2084 (PQ) transfer-function props —
-/// the exact colorimetry Mutter's monitor stream advertises while the mirrored monitor is in
-/// HDR mode (its HDR pods carry the same props MANDATORY, so both sides must speak them for
-/// the intersection to exist; an SDR or pre-50 producer can never match this pod).
-///
-/// LINEAR-only because every 10-bit consumer we have reads the buffer without a de-tile pass:
-/// the CPU path mmaps it, and the VAAPI passthrough imports it into a VA surface. The tiled
-/// EGL de-tile blit renders into an 8-bit `GL_RGBA8` texture — it would silently crush the
-/// depth — so tiled modifiers are deliberately NOT advertised (a zero-copy 10-bit de-tile is
-/// the follow-up). SHM is excluded entirely: Mutter's SHM record path paints 8-bit ARGB32
-/// regardless of the negotiated format.
-/// `SPA_VIDEO_TRANSFER_SMPTE2084` (PQ) — spelled out rather than taken from `pw::spa::sys`
-/// because libspa only grew the constant with the BT2020_10/SMPTE2084/ARIB_STD_B67 block, and
-/// the distro builders (Ubuntu 24.04 noble for the .deb) ship headers predating it — bindgen
-/// then emits no such constant and the host fails to compile there, even though the code never
-/// runs on those systems (the HDR path needs GNOME 50+).
-///
-/// 14 is the enum's position in `spa/param/video/color.h` and is wire ABI, not a private
-/// detail: SPA mirrors GStreamer's `GstVideoTransferFunction`, where that block was added
-/// together, so the value is identical on every libspa that has the symbol at all. On one that
-/// doesn't, PipeWire simply fails to intersect this format offer and the session negotiates
-/// SDR — the same outcome as not offering HDR.
-const SPA_VIDEO_TRANSFER_SMPTE2084: u32 = 14;
-
-pub(super) fn build_hdr_dmabuf_format(
-    format: VideoFormat,
-    preferred: Option<(u32, u32, u32)>,
-) -> Result<Vec<u8>> {
-    let (dw, dh, dhz) = preferred.unwrap_or((1920, 1080, 60));
-    use pw::spa::param::format::{FormatProperties, MediaSubtype, MediaType};
-    let mut obj = pw::spa::pod::object!(
-        pw::spa::utils::SpaTypes::ObjectParamFormat,
-        pw::spa::param::ParamType::EnumFormat,
-        pw::spa::pod::property!(FormatProperties::MediaType, Id, MediaType::Video),
-        pw::spa::pod::property!(FormatProperties::MediaSubtype, Id, MediaSubtype::Raw),
-        pw::spa::pod::property!(FormatProperties::VideoFormat, Id, format),
-        pw::spa::pod::property!(
-            FormatProperties::VideoSize,
-            Choice,
-            Range,
-            Rectangle,
-            pw::spa::utils::Rectangle {
-                width: dw,
-                height: dh
-            },
-            pw::spa::utils::Rectangle {
-                width: 1,
-                height: 1
-            },
-            pw::spa::utils::Rectangle {
-                width: 8192,
-                height: 8192
-            }
-        ),
-        pw::spa::pod::property!(
-            FormatProperties::VideoFramerate,
-            Choice,
-            Range,
-            Fraction,
-            pw::spa::utils::Fraction { num: dhz, denom: 1 },
-            pw::spa::utils::Fraction { num: 0, denom: 1 },
-            pw::spa::utils::Fraction { num: 240, denom: 1 }
-        ),
-    );
-    obj.properties.push(pw::spa::pod::Property {
-        key: pw::spa::sys::SPA_FORMAT_VIDEO_modifier,
-        flags: pw::spa::pod::PropertyFlags::MANDATORY,
-        value: pw::spa::pod::Value::Long(0), // DRM_FORMAT_MOD_LINEAR
-    });
-    obj.properties.push(pw::spa::pod::Property {
-        key: pw::spa::sys::SPA_FORMAT_VIDEO_transferFunction,
-        flags: pw::spa::pod::PropertyFlags::MANDATORY,
-        value: pw::spa::pod::Value::Id(pw::spa::utils::Id(SPA_VIDEO_TRANSFER_SMPTE2084)),
-    });
-    obj.properties.push(pw::spa::pod::Property {
-        key: pw::spa::sys::SPA_FORMAT_VIDEO_colorPrimaries,
-        flags: pw::spa::pod::PropertyFlags::MANDATORY,
-        value: pw::spa::pod::Value::Id(pw::spa::utils::Id(
-            pw::spa::sys::SPA_VIDEO_COLOR_PRIMARIES_BT2020,
-        )),
-    });
-    serialize_pod(obj)
-}
-
-/// The default (shm/CPU-path) format offer: raw video in any encoder-mappable layout, any
-/// size, any framerate (0/1 = variable allowed — gamescope fixates exactly that).
-pub(super) fn build_default_format_obj(preferred: Option<(u32, u32, u32)>) -> pw::spa::pod::Object {
-    let (dw, dh, dhz) = preferred.unwrap_or((1920, 1080, 60));
-    pw::spa::pod::object!(
-        pw::spa::utils::SpaTypes::ObjectParamFormat,
-        pw::spa::param::ParamType::EnumFormat,
-        pw::spa::pod::property!(
-            pw::spa::param::format::FormatProperties::MediaType,
-            Id,
-            pw::spa::param::format::MediaType::Video
-        ),
-        pw::spa::pod::property!(
-            pw::spa::param::format::FormatProperties::MediaSubtype,
-            Id,
-            pw::spa::param::format::MediaSubtype::Raw
-        ),
-        // Offer the layouts the encoder can map to an NVENC input format. wlroots
-        // commonly fixates packed RGB (3 bpp); other compositors offer 4 bpp. Only
-        // these are requested, so negotiation fails loudly rather than handing us a
-        // format we'd misinterpret.
-        pw::spa::pod::property!(
-            pw::spa::param::format::FormatProperties::VideoFormat,
-            Choice,
-            Enum,
-            Id,
-            VideoFormat::RGB,
-            VideoFormat::RGB,
-            VideoFormat::BGR,
-            VideoFormat::RGBx,
-            VideoFormat::BGRx,
-            VideoFormat::RGBA,
-            VideoFormat::BGRA,
-        ),
-        pw::spa::pod::property!(
-            pw::spa::param::format::FormatProperties::VideoSize,
-            Choice,
-            Range,
-            Rectangle,
-            pw::spa::utils::Rectangle {
-                width: dw,
-                height: dh
-            },
-            pw::spa::utils::Rectangle {
-                width: 1,
-                height: 1
-            },
-            pw::spa::utils::Rectangle {
-                width: 8192,
-                height: 8192
-            }
-        ),
-        pw::spa::pod::property!(
-            pw::spa::param::format::FormatProperties::VideoFramerate,
-            Choice,
-            Range,
-            Fraction,
-            pw::spa::utils::Fraction { num: dhz, denom: 1 },
-            pw::spa::utils::Fraction { num: 0, denom: 1 },
-            pw::spa::utils::Fraction { num: 240, denom: 1 }
-        ),
-    )
-}
-
-/// Build a Buffers param for the CPU path accepting anything mappable: MemPtr, MemFd, and
-/// DmaBuf. The DmaBuf bit matters for producers like gamescope whose format intersection
-/// lands on their modifier-bearing (LINEAR) pod: they then offer *only* DmaBuf buffers, and
-/// without this bit the buffer-type intersection is empty and the link silently stalls in
-/// "negotiating". A LINEAR dmabuf is mmap-able by MAP_BUFFERS, so the CPU de-pad copy works.
-pub(super) fn build_mappable_buffers() -> Result<Vec<u8>> {
-    serialize_pod(pw::spa::pod::Object {
-        type_: pw::spa::utils::SpaTypes::ObjectParamBuffers.as_raw(),
-        id: pw::spa::param::ParamType::Buffers.as_raw(),
-        properties: vec![pw::spa::pod::Property {
-            key: pw::spa::sys::SPA_PARAM_BUFFERS_dataType,
-            flags: pw::spa::pod::PropertyFlags::empty(),
-            value: pw::spa::pod::Value::Int(
-                (1i32 << pw::spa::sys::SPA_DATA_MemPtr)
-                    | (1i32 << pw::spa::sys::SPA_DATA_MemFd)
-                    | (1i32 << pw::spa::sys::SPA_DATA_DmaBuf),
-            ),
-        }],
-    })
-}
-
-/// Build a Buffers param for a TRUE SHM path: MemPtr + MemFd only, NO DmaBuf. Forces the
-/// producer to download into mappable memory (Mutter's `glReadPixels`), which orders against its
-/// render — so the frame is complete and current by construction. This is the only race-free
-/// capture of Mutter's virtual monitor on NVIDIA: the compositor renders straight into the buffer
-/// pool, NVIDIA attaches no implicit dmabuf fence (verified: `EXPORT_SYNC_FILE` waited=false) and
-/// can't produce an explicit sync_fd, so any dmabuf read (zero-copy OR mmap) races the render and
-/// flashes the buffer's previous frame. Excluding DmaBuf is what makes the difference vs.
-/// `build_mappable_buffers` (which still let Mutter hand dmabufs).
-pub(super) fn build_shm_only_buffers() -> Result<Vec<u8>> {
-    serialize_pod(pw::spa::pod::Object {
-        type_: pw::spa::utils::SpaTypes::ObjectParamBuffers.as_raw(),
-        id: pw::spa::param::ParamType::Buffers.as_raw(),
-        properties: vec![pw::spa::pod::Property {
-            key: pw::spa::sys::SPA_PARAM_BUFFERS_dataType,
-            flags: pw::spa::pod::PropertyFlags::empty(),
-            value: pw::spa::pod::Value::Int(
-                (1i32 << pw::spa::sys::SPA_DATA_MemPtr) | (1i32 << pw::spa::sys::SPA_DATA_MemFd),
-            ),
-        }],
-    })
-}
-
-/// Build a Buffers param requesting dmabuf-only buffers.
-pub(super) fn build_dmabuf_buffers() -> Result<Vec<u8>> {
-    serialize_pod(pw::spa::pod::Object {
-        type_: pw::spa::utils::SpaTypes::ObjectParamBuffers.as_raw(),
-        id: pw::spa::param::ParamType::Buffers.as_raw(),
-        properties: vec![pw::spa::pod::Property {
-            key: pw::spa::sys::SPA_PARAM_BUFFERS_dataType,
-            flags: pw::spa::pod::PropertyFlags::empty(),
-            value: pw::spa::pod::Value::Int(1i32 << pw::spa::sys::SPA_DATA_DmaBuf),
-        }],
-    })
-}
-
-/// Request the compositor attach `SPA_META_Cursor` to each buffer, so the pointer travels as
-/// metadata (position + an occasional bitmap) instead of being burned into the frame. Paired
-/// with the portal's `CursorMode::Metadata`; producers that don't support it simply don't
-/// attach it (harmless). Size is a range up to a 256×256 bitmap — bigger than any real cursor.
-pub(super) fn build_cursor_meta_param() -> Result<Vec<u8>> {
-    fn meta_size(w: u32, h: u32) -> i32 {
-        (std::mem::size_of::<spa::sys::spa_meta_cursor>()
-            + std::mem::size_of::<spa::sys::spa_meta_bitmap>()
-            + (w as usize * h as usize * 4)) as i32
-    }
-    serialize_pod(pw::spa::pod::Object {
-        type_: pw::spa::utils::SpaTypes::ObjectParamMeta.as_raw(),
-        id: pw::spa::param::ParamType::Meta.as_raw(),
-        properties: vec![
-            pw::spa::pod::Property {
-                key: pw::spa::sys::SPA_PARAM_META_type,
-                flags: pw::spa::pod::PropertyFlags::empty(),
-                value: pw::spa::pod::Value::Id(pw::spa::utils::Id(spa::sys::SPA_META_Cursor)),
-            },
-            pw::spa::pod::Property {
-                key: pw::spa::sys::SPA_PARAM_META_size,
-                flags: pw::spa::pod::PropertyFlags::empty(),
-                value: pw::spa::pod::Value::Choice(pw::spa::pod::ChoiceValue::Int(
-                    pw::spa::utils::Choice(
-                        pw::spa::utils::ChoiceFlags::empty(),
-                        // The max must cover the producer's offer or the Meta param silently
-                        // fails to negotiate and NO buffer ever carries the meta region:
-                        // Mutter offers a FIXED `SPA_POD_Int(CURSOR_META_SIZE(384, 384))`
-                        // (meta-screen-cast-stream-src.c, GNOME 50) — a 256² max made the
-                        // intersection empty, which cost the whole Linux cursor channel
-                        // on-glass. 1024² is headroom, not an allocation: the negotiated
-                        // region follows the producer's value.
-                        pw::spa::utils::ChoiceEnum::Range {
-                            default: meta_size(64, 64),
-                            min: meta_size(1, 1),
-                            max: meta_size(1024, 1024),
-                        },
-                    ),
-                )),
-            },
-        ],
-    })
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// The `SPA_PARAM_BUFFERS_dataType` bitmask a serialized Buffers pod carries.
-    ///
-    /// A deliberately literal SPA reader rather than a heuristic scan: an object property is
-    /// `{ key: u32, flags: u32, value: spa_pod }` and a `spa_pod` is `{ size: u32, type: u32, body }`,
-    /// so the `i32` sits exactly 16 bytes past the key — and the intervening `size` word is itself
-    /// `4`, which is why "find the first plausible-looking int" reads the wrong field.
-    fn buffers_data_type(pod: &[u8]) -> i32 {
-        let key = spa::sys::SPA_PARAM_BUFFERS_dataType.to_ne_bytes();
-        let at = pod
-            .windows(4)
-            .position(|w| w == key)
-            .expect("dataType key present in the Buffers pod");
-        let word = |off: usize| u32::from_ne_bytes(pod[off..off + 4].try_into().unwrap());
-        assert_eq!(word(at + 8), 4, "dataType's value pod should be 4 bytes");
-        assert_eq!(
-            word(at + 12),
-            spa::sys::SPA_TYPE_Int,
-            "dataType's value pod should be an Int"
-        );
-        i32::from_ne_bytes(pod[at + 16..at + 20].try_into().unwrap())
-    }
-
-    const MEM_PTR: i32 = 1 << spa::sys::SPA_DATA_MemPtr;
-    const MEM_FD: i32 = 1 << spa::sys::SPA_DATA_MemFd;
-    const DMABUF: i32 = 1 << spa::sys::SPA_DATA_DmaBuf;
-
-    /// The three Buffers pods differ ONLY in this bitmask, and each bit is load-bearing:
-    /// `build_mappable_buffers` must include DmaBuf or gamescope's modifier-bearing pod wins the
-    /// format intersection and the BUFFER intersection is then empty (a link stuck in
-    /// "negotiating"); `build_shm_only_buffers` must EXCLUDE it or Mutter hands dmabufs and the
-    /// race-free download path is not race-free; `build_dmabuf_buffers` must exclude the mappable
-    /// types or an HDR session can be handed a MemFd buffer, which Mutter paints 8-bit ARGB32
-    /// regardless of the negotiated 10-bit format.
-    #[test]
-    fn each_buffers_pod_requests_exactly_its_own_data_types() {
-        assert_eq!(
-            buffers_data_type(&build_mappable_buffers().unwrap()),
-            MEM_PTR | MEM_FD | DMABUF,
-            "the CPU path must accept mappable dmabufs too"
-        );
-        assert_eq!(
-            buffers_data_type(&build_shm_only_buffers().unwrap()),
-            MEM_PTR | MEM_FD,
-            "PUNKTFUNK_FORCE_SHM must exclude DmaBuf"
-        );
-        assert_eq!(
-            buffers_data_type(&build_dmabuf_buffers().unwrap()),
-            DMABUF,
-            "the zero-copy/HDR path must exclude SHM"
-        );
-    }
-
-    /// Every pod builder must produce a pod libspa will accept back — a serializer that silently
-    /// emitted a malformed object would fail only at negotiation, on a live compositor.
-    #[test]
-    fn every_pod_round_trips_through_pod_from_bytes() {
-        let mut pods: Vec<(&str, Vec<u8>)> = vec![
-            ("mappable buffers", build_mappable_buffers().unwrap()),
-            ("shm-only buffers", build_shm_only_buffers().unwrap()),
-            ("dmabuf buffers", build_dmabuf_buffers().unwrap()),
-            ("cursor meta", build_cursor_meta_param().unwrap()),
-            (
-                "default format",
-                serialize_pod(build_default_format_obj(None)).unwrap(),
-            ),
-            (
-                "dmabuf BGRx",
-                build_dmabuf_format(VideoFormat::BGRx, &[0, 1, 2], Some((1920, 1080, 60))).unwrap(),
-            ),
-            (
-                "dmabuf NV12",
-                build_dmabuf_format(VideoFormat::NV12, &[0], Some((1280, 720, 60))).unwrap(),
-            ),
-            (
-                "hdr xRGB",
-                build_hdr_dmabuf_format(VideoFormat::xRGB_210LE, None).unwrap(),
-            ),
-            (
-                "hdr xBGR",
-                build_hdr_dmabuf_format(VideoFormat::xBGR_210LE, Some((3840, 2160, 120))).unwrap(),
-            ),
-        ];
-        for (name, bytes) in &mut pods {
-            assert!(!bytes.is_empty(), "{name} serialized to nothing");
-            assert_eq!(bytes.len() % 8, 0, "{name} is not 8-byte aligned/padded");
-            assert!(
-                spa::pod::Pod::from_bytes(bytes).is_some(),
-                "{name} did not parse back as a pod"
-            );
-        }
-    }
-
-    /// The HDR pods carry BOTH colorimetry properties MANDATORY — Mutter's HDR pods do the same, so
-    /// the intersection only exists if we speak them. Dropping either would negotiate an SDR-labelled
-    /// 10-bit stream (or nothing at all).
-    #[test]
-    fn the_hdr_pods_carry_mandatory_pq_and_bt2020() {
-        for fmt in [VideoFormat::xRGB_210LE, VideoFormat::xBGR_210LE] {
-            let pod = build_hdr_dmabuf_format(fmt, None).unwrap();
-            for (name, key) in [
-                (
-                    "transferFunction",
-                    spa::sys::SPA_FORMAT_VIDEO_transferFunction,
-                ),
-                ("colorPrimaries", spa::sys::SPA_FORMAT_VIDEO_colorPrimaries),
-                ("modifier", spa::sys::SPA_FORMAT_VIDEO_modifier),
-            ] {
-                assert!(
-                    pod.windows(4).any(|w| w == key.to_ne_bytes()),
-                    "{fmt:?} pod is missing {name}"
-                );
-            }
-            // The PQ id and BT.2020 id must both appear as values.
-            assert!(
-                pod.windows(4)
-                    .any(|w| w == SPA_VIDEO_TRANSFER_SMPTE2084.to_ne_bytes()),
-                "{fmt:?} pod does not carry the PQ transfer id"
-            );
-            assert!(
-                pod.windows(4)
-                    .any(|w| w == spa::sys::SPA_VIDEO_COLOR_PRIMARIES_BT2020.to_ne_bytes()),
-                "{fmt:?} pod does not carry BT.2020 primaries"
-            );
-        }
-    }
-
-    /// An NV12 offer pins BT.709 limited so gamescope's producer-side RGB→YUV shader matches OUR
-    /// bitstream colorimetry; the packed-RGB offer must NOT carry those (it is not YUV).
-    #[test]
-    fn only_the_nv12_offer_pins_the_colour_matrix() {
-        let nv12 = build_dmabuf_format(VideoFormat::NV12, &[0], None).unwrap();
-        let bgrx = build_dmabuf_format(VideoFormat::BGRx, &[0], None).unwrap();
-        for (name, key) in [
-            ("colorMatrix", spa::sys::SPA_FORMAT_VIDEO_colorMatrix),
-            ("colorRange", spa::sys::SPA_FORMAT_VIDEO_colorRange),
-        ] {
-            assert!(
-                nv12.windows(4).any(|w| w == key.to_ne_bytes()),
-                "NV12 offer is missing {name}"
-            );
-            assert!(
-                !bgrx.windows(4).any(|w| w == key.to_ne_bytes()),
-                "packed-RGB offer should not pin {name}"
-            );
-        }
-    }
-
-    /// Pin our hand-written PQ transfer id against the real libspa binding. We can't take the
-    /// constant from `pw::spa::sys` directly (older distro headers don't export it — see
-    /// [`super::SPA_VIDEO_TRANSFER_SMPTE2084`]), so assert the two agree wherever the symbol
-    /// DOES exist. Any libspa that renumbers the enum fails this instead of silently tagging
-    /// the HDR offer with the wrong transfer function.
-    ///
-    /// Only builds where tests are compiled — the .deb/.rpm builders run plain `cargo build`,
-    /// so this never reintroduces the compile failure it exists to prevent.
-    #[test]
-    fn pq_transfer_id_matches_libspa() {
-        assert_eq!(
-            super::SPA_VIDEO_TRANSFER_SMPTE2084,
-            super::pw::spa::sys::SPA_VIDEO_TRANSFER_SMPTE2084,
-            "libspa renumbered spa_video_transfer_function — update the hardcoded PQ id"
-        );
-    }
-}
@@ -1,957 +0,0 @@
-//! XFixes cursor source for the gamescope capture path (remote-desktop-sweep Phase C).
-//!
-//! gamescope draws the pointer on a DRM hardware-cursor plane and its `paint_pipewire()`
-//! deliberately excludes the cursor from the frame it feeds its built-in PipeWire node — so
-//! `SPA_META_Cursor` never arrives and the ordinary [`cursor_live`](super::PortalCapturer) slot
-//! stays empty (a KWin/GNOME session gets its cursor from that meta; gamescope can't embed one
-//! either, its `set_hw_cursor` is inert). We instead read the pointer from gamescope's nested
-//! Xwayland via X11 — the trick Sunshine uses — and publish a [`CursorOverlay`] into that same
-//! slot, so the encoder blend composites the pointer into the video exactly like the portal path.
-//!
-//! **Multiple Xwaylands.** gamescope runs one Xwayland per `--xwayland-count` (Steam Gaming Mode
-//! uses 2: one for Big Picture, one for the game). The pointer lives on whichever is FOCUSED — an
-//! inactive display's pointer is frozen. So the source connects to ALL of them and publishes from
-//! the one gamescope is actually drawing the pointer on; it reads that display's shape too, since
-//! each Xwayland has its own current cursor. This is why a single-display read froze the pointer
-//! the moment a game on the OTHER Xwayland took focus.
-//!
-//! Three X sources per display, split by cost (Sunshine's split, plus gamescope's own verdict):
-//! * **Position** — core `QueryPointer` on the root, polled fast. Cheap (a few-byte reply, no
-//!   bitmap), so it can out-pace the stream fps and keep the composited pointer smooth.
-//! * **Shape / hotspot** — `XFixesGetCursorImage`, refreshed only after an XFixes `CursorNotify`
-//!   (a real cursor change). A fully-transparent image reads as hidden.
-//! * **Visibility + focus** — [`GAMESCOPE_CURSOR_VISIBLE_FEEDBACK`](GS_CURSOR_FEEDBACK) on the
-//!   root, read at connect and re-read on its `PropertyNotify`.
-//!
-//! **Why the feedback atom and not pointer motion.** gamescope hides its pointer by WARPING the X
-//! pointer to the root's bottom-right corner pixel — it does NOT swap in a transparent X cursor, so
-//! `XFixesGetCursorImage` keeps handing back the last opaque arrow. The original "follow whichever
-//! display's pointer moved" heuristic therefore stuck to the parked display (a parked pointer never
-//! moves again) and composited that arrow at `(w-1, h-1)`: a sliver of cursor welded to the corner
-//! of the stream for the rest of the session, while the real pointer went undrawn. Reported
-//! on-glass as "part of cursor shows up on bottom right … isn't where it really is", in every game
-//! (a game grabs the pointer, so the hide is permanent). Measured on a live 1920x1080 Gaming Mode
-//! session: real motion ⇒ pointer live + feedback `1`; 3 s idle (`--hide-cursor-delay 3000`) ⇒
-//! pointer `(1919, 1079)` + feedback `0`. The atom answers BOTH questions correctly for a static
-//! pointer, which motion cannot: which Xwayland owns it, and whether to draw it at all — so
-//! honouring it also gives the stream gamescope's own idle auto-hide, which this source never had.
-
-use std::sync::{
-    atomic::{AtomicBool, AtomicU64, Ordering},
-    Arc, Mutex,
-};
-use std::time::Duration;
-
-use pf_frame::CursorOverlay;
-use x11rb::connection::Connection;
-use x11rb::errors::ReplyError;
-use x11rb::protocol::xfixes::{self, ConnectionExt as _, GetCursorImageReply};
-use x11rb::protocol::xproto::{
-    Atom, AtomEnum, ChangeWindowAttributesAux, ConnectionExt as _, EventMask, QueryPointerReply,
-    Window,
-};
-use x11rb::protocol::Event;
-use x11rb::rust_connection::{DefaultStream, RustConnection};
-
-use crate::GamescopeCursorTargets;
-
-/// Serializes the `XAUTHORITY` env swap of the LEGACY connect fallback (the var is process-global).
-///
-/// The fallback is a last resort now — see [`connect_conn`]. It serialises this source against
-/// itself and nothing else: `getenv` needs no lock to be racy, so every OTHER thread's read (libspa
-/// plugin load, EGL/CUDA init — concurrent by construction, since `attach_gamescope_cursor` runs
-/// while the PipeWire thread is starting) could still observe the swapped value or a torn
-/// environ. That is why the primary path parses the cookie itself and never touches the
-/// environment.
-static XAUTH_LOCK: Mutex<()> = Mutex::new(());
-
-/// The `MIT-MAGIC-COOKIE-1` auth-protocol name, as it appears in an `.Xauthority` entry.
-const MIT_MAGIC_COOKIE_1: &[u8] = b"MIT-MAGIC-COOKIE-1";
-
-/// Re-run the targets provider this often: adopt Xwaylands that appeared after the stream started
-/// (gamescope spawns the game's on launch and advertises only the first in any child's environ) and
-/// retry ones whose connection died. Two seconds is far below a human's tolerance for a missing
-/// pointer and costs one cheap socket probe per known display.
-const REDISCOVER: Duration = Duration::from_secs(2);
-
-/// Position out-paces the stream fps (`POLL`); shape rides `CursorNotify` events drained each tick.
-/// 4 ms ≈ 250 Hz matches the Windows GDI poller — the polled position IS the composited position
-/// and must out-run a 240 fps session or the pointer stutters.
-const POLL: Duration = Duration::from_millis(4);
-
-/// gamescope's own pointer verdict, published on EVERY nested Xwayland's root: `1` on the server
-/// whose pointer gamescope is currently drawing, `0` on the others — and `0` on all of them once
-/// the pointer is hidden (a game grabbed it, or `--hide-cursor-delay` fired). See the module docs
-/// for why this, and not pointer motion, is the signal this source follows.
-const GS_CURSOR_FEEDBACK: &str = "GAMESCOPE_CURSOR_VISIBLE_FEEDBACK";
-
-/// Self-heal cadence for the feedback re-read: `PropertyNotify` drives it, this only covers a
-/// missed/coalesced event (and a gamescope that publishes the atom after we connected). One
-/// `GetProperty` per display per interval is nothing next to the 250 Hz pointer poll.
-const FEEDBACK_RESYNC: Duration = Duration::from_millis(250);
-
-/// A running XFixes cursor reader. Dropping it stops the worker thread and waits — bounded — for it
-/// to release the X connections, so it lives (at most) as long as the capturer that owns it.
-pub(super) struct XFixesCursorSource {
-    stop: Arc<AtomicBool>,
-    /// Signalled by the worker just before it returns — lets `Drop` bound its wait (see there).
-    done: std::sync::mpsc::Receiver<()>,
-    join: Option<std::thread::JoinHandle<()>>,
-}
-
-impl XFixesCursorSource {
-    /// Start publishing cursor overlays into `slot` from whichever of gamescope's nested Xwaylands
-    /// it is drawing the pointer on. `targets` is re-run every [`REDISCOVER`] to adopt Xwaylands
-    /// that appear later and retry dead ones; `frame_size` is the negotiated capture size, packed
-    /// `(w << 32) | h`, `0` until the first negotiation (see [`scale_to_frame`]).
-    ///
-    /// Returns `None` only if the thread cannot be spawned. An empty or entirely-unusable target
-    /// list is NOT a failure: the worker idles and keeps re-running the provider, so a stream that
-    /// starts before the game converges instead of being cursorless for the session.
-    pub(super) fn spawn(
-        targets: GamescopeCursorTargets,
-        slot: Arc<Mutex<Option<CursorOverlay>>>,
-        frame_size: Arc<AtomicU64>,
-    ) -> Option<Self> {
-        // First pass on the caller's thread: the common case connects here, so the log line below
-        // reports the real state instead of "starting…".
-        let mut displays = Vec::new();
-        rediscover(&mut displays, &targets, true);
-        let names: Vec<&str> = displays.iter().map(|d| d.name.as_str()).collect();
-        let feedback = displays.iter().any(|d| d.gs_visible.is_some());
-        if displays.is_empty() {
-            tracing::warn!(
-                "gamescope cursor: no usable nested Xwayland yet — retrying every {}s (a game's \
-                 Xwayland appears when it launches)",
-                REDISCOVER.as_secs()
-            );
-        } else {
-            tracing::info!(
-                displays = ?names,
-                cursor_feedback = feedback,
-                "gamescope cursor: XFixes source live — following the Xwayland gamescope draws the \
-                 pointer on (cursor_feedback=false ⇒ this gamescope publishes no \
-                 GAMESCOPE_CURSOR_VISIBLE_FEEDBACK, degrading to the pointer-motion heuristic)"
-            );
-        }
-
-        let stop = Arc::new(AtomicBool::new(false));
-        let stop_worker = Arc::clone(&stop);
-        let (done_tx, done_rx) = std::sync::mpsc::sync_channel::<()>(1);
-        let join = std::thread::Builder::new()
-            .name("pf-gs-cursor".into())
-            .spawn(move || {
-                run(displays, slot, stop_worker, targets, frame_size);
-                let _ = done_tx.send(());
-            })
-            .ok()?;
-        Some(XFixesCursorSource {
-            stop,
-            done: done_rx,
-            join: Some(join),
-        })
-    }
-}
-
-impl Drop for XFixesCursorSource {
-    fn drop(&mut self) {
-        self.stop.store(true, Ordering::Relaxed);
-        // BOUNDED join. The worker blocks in `RustConnection` replies with no read timeout, so a
-        // peer that stops answering while keeping its socket open (a hung Xwayland) would hang
-        // capturer teardown — and teardown runs on the session path. On timeout we detach: the
-        // thread only ever touches its own X connections and an `Arc`'d slot, so leaving it to
-        // finish on its own is safe (it observes `stop` and exits the moment its reply lands).
-        let joinable = self.done.recv_timeout(Duration::from_millis(250)).is_ok();
-        if let Some(j) = self.join.take() {
-            if joinable {
-                let _ = j.join(); // returns at once: `done` already fired
-            } else {
-                tracing::warn!(
-                    "gamescope cursor: worker did not stop within 250ms (blocked on an X reply?) — \
-                     detaching it"
-                );
-            }
-        }
-    }
-}
-
-/// Re-run the targets provider and reconcile `displays` with it: connect to any target we do not
-/// track yet, and re-connect one whose display died. Existing healthy displays are left alone, so
-/// their shape cache and last position survive.
-fn rediscover(displays: &mut Vec<XDisplay>, targets: &GamescopeCursorTargets, first: bool) {
-    for (dpy, xauth) in targets() {
-        let existing = displays.iter().position(|d| d.name == dpy);
-        if existing.is_some_and(|i| !displays[i].dead) {
-            continue;
-        }
-        match connect(&dpy, xauth.as_deref()) {
-            Ok((conn, root, root_size, feedback)) => {
-                let d = XDisplay::new(dpy.clone(), conn, root, root_size, feedback);
-                match existing {
-                    Some(i) => {
-                        tracing::info!(dpy = %dpy, "gamescope cursor: reconnected a nested Xwayland");
-                        displays[i] = d;
-                    }
-                    None => {
-                        if !first {
-                            tracing::info!(dpy = %dpy, "gamescope cursor: adopted a new nested Xwayland");
-                        }
-                        displays.push(d);
-                    }
-                }
-            }
-            // Debug, not warn: with a 2 s retry a warn would flood for every Xwayland a
-            // `--xwayland-count` reports but that never comes up.
-            Err(e) if first => tracing::warn!(
-                dpy = %dpy, error = %e,
-                "gamescope cursor: skipping a nested Xwayland we can't use (will retry)"
-            ),
-            Err(e) => tracing::debug!(dpy = %dpy, error = %e, "gamescope cursor: retry failed"),
-        }
-    }
-}
-
-/// Open the X connection, negotiate XFixes, and select cursor-change + root-property events —
-/// returning the connection, root window, the root's pixel size (for [`scale_to_frame`]) and this
-/// display's initial [`GAMESCOPE_CURSOR_FEEDBACK`](GS_CURSOR_FEEDBACK) reading (`(atom, value)`;
-/// the value is `None` when gamescope publishes no such property here).
-type Connected = (RustConnection, Window, (u16, u16), (Atom, Option<bool>));
-
-fn connect(dpy: &str, xauthority: Option<&str>) -> Result<Connected, String> {
-    let (conn, screen_num) = connect_conn(dpy, xauthority)?;
-
-    // XFixes ≥ 1 gives GetCursorImage / SelectCursorInput; ask for a modern minor, take what we get.
-    conn.xfixes_query_version(5, 0)
-        .map_err(ReplyError::from)
-        .and_then(|c| c.reply())
-        .map_err(|e| format!("XFixes unavailable: {e}"))?;
-
-    let screen = conn
-        .setup()
-        .roots
-        .get(screen_num)
-        .ok_or_else(|| format!("no X screen {screen_num}"))?;
-    let root = screen.root;
-    // gamescope's nested root can be a DIFFERENT size from the output/PipeWire node it publishes
-    // (`-w/-h` vs `-W/-H` are independent knobs), and this is the space `QueryPointer` answers in.
-    // Free here — the setup reply is already parsed.
-    let root_size = (screen.width_in_pixels, screen.height_in_pixels);
-
-    // Wake the worker's event drain whenever the cursor shape changes (incl. hide/show).
-    conn.xfixes_select_cursor_input(root, xfixes::CursorNotifyMask::DISPLAY_CURSOR)
-        .map_err(ReplyError::from)
-        .and_then(|c| c.check())
-        .map_err(|e| format!("SelectCursorInput: {e}"))?;
-
-    // …and whenever gamescope republishes its cursor verdict. Interned with `only_if_exists=false`
-    // so we hold a matchable atom id even on a gamescope that sets the property later; a failure to
-    // select PROPERTY_CHANGE is NOT fatal — the resync re-read still tracks it, just at 250 ms.
-    let feedback_atom = conn
-        .intern_atom(false, GS_CURSOR_FEEDBACK.as_bytes())
-        .map_err(ReplyError::from)
-        .and_then(|c| c.reply())
-        .map(|r| r.atom)
-        .unwrap_or(0);
-    if let Ok(c) = conn.change_window_attributes(
-        root,
-        &ChangeWindowAttributesAux::new().event_mask(EventMask::PROPERTY_CHANGE),
-    ) {
-        let _ = c.check();
-    }
-    let _ = conn.flush();
-    let feedback = read_cursor_feedback(&conn, root, feedback_atom);
-    Ok((conn, root, root_size, (feedback_atom, feedback)))
-}
-
-/// Establish the X connection for `dpy` using `xauthority`'s cookie, WITHOUT touching this process's
-/// environment.
-///
-/// `RustConnection::connect` reads `XAUTHORITY` from the env, so the original implementation
-/// `set_var`'d it around each connect under [`XAUTH_LOCK`]. That is unsound from a live
-/// multithreaded host: the lock serialises this source against itself, but `getenv` takes no lock,
-/// so any concurrent reader (libspa's plugin load, EGL/CUDA init — running at exactly this moment,
-/// since the PipeWire thread is starting up) could read the swapped value or race the environ
-/// rewrite outright. The project already has a process-wide env-lock discipline elsewhere, but
-/// sharing it would be the wrong layer AND would still not fix `getenv`.
-///
-/// So: parse the MIT-MAGIC-COOKIE-1 entry out of the file ourselves and hand it to
-/// `connect_to_stream_with_auth_info`, which is what `RustConnection::connect` does internally with
-/// the cookie IT found. The env swap survives only as a fallback for a file we cannot parse (an
-/// unexpected layout, or an auth family whose entry we decline to guess at).
-fn connect_conn(dpy: &str, xauthority: Option<&str>) -> Result<(RustConnection, usize), String> {
-    let Some(path) = xauthority else {
-        // No per-display cookie file to inject: the ambient environment is already what this
-        // connect should use, so there is nothing to swap and nothing to parse.
-        return RustConnection::connect(Some(dpy)).map_err(|e| format!("connect: {e}"));
-    };
-    match mit_magic_cookie(path, dpy) {
-        Some((name, data)) => match connect_with_cookie(dpy, name, data) {
-            Ok(v) => return Ok(v),
-            Err(e) => tracing::debug!(
-                dpy = %dpy, xauthority = %path, error = %e,
-                "gamescope cursor: cookie connect failed — falling back to the XAUTHORITY env swap"
-            ),
-        },
-        None => tracing::debug!(
-            dpy = %dpy, xauthority = %path,
-            "gamescope cursor: no MIT-MAGIC-COOKIE-1 entry for this display — falling back to the \
-             XAUTHORITY env swap"
-        ),
-    }
-    connect_via_env_swap(dpy, path)
-}
-
-/// Connect to `dpy` and complete the setup handshake with an explicit cookie — the same two steps
-/// `RustConnection::connect` performs, minus its env-derived auth lookup.
-fn connect_with_cookie(
-    dpy: &str,
-    auth_name: Vec<u8>,
-    auth_data: Vec<u8>,
-) -> Result<(RustConnection, usize), String> {
-    let parsed = x11rb::reexports::x11rb_protocol::parse_display::parse_display(Some(dpy))
-        .map_err(|e| format!("parse display {dpy}: {e}"))?;
-    let screen = usize::from(parsed.screen);
-    let mut stream = None;
-    let mut last_err = None;
-    for addr in parsed.connect_instruction() {
-        match DefaultStream::connect(&addr) {
-            Ok((s, _peer)) => {
-                stream = Some(s);
-                break;
-            }
-            Err(e) => last_err = Some(e),
-        }
-    }
-    let stream = stream.ok_or_else(|| match last_err {
-        Some(e) => format!("connect: {e}"),
-        None => "connect: no usable address".to_string(),
-    })?;
-    RustConnection::connect_to_stream_with_auth_info(stream, screen, auth_name, auth_data)
-        .map(|c| (c, screen))
-        .map_err(|e| format!("setup: {e}"))
-}
-
-/// LEGACY fallback (see [`connect_conn`]): swap `XAUTHORITY`, connect, restore. Serialised against
-/// this source's own concurrent connects, but NOT against other threads' `getenv` — which is why it
-/// is a fallback and not the path taken.
-fn connect_via_env_swap(dpy: &str, xauthority: &str) -> Result<(RustConnection, usize), String> {
-    let _g = XAUTH_LOCK.lock().unwrap_or_else(|e| e.into_inner());
-    let prev = std::env::var_os("XAUTHORITY");
-    std::env::set_var("XAUTHORITY", xauthority);
-    let out = RustConnection::connect(Some(dpy));
-    match prev {
-        Some(p) => std::env::set_var("XAUTHORITY", p),
-        None => std::env::remove_var("XAUTHORITY"),
-    }
-    out.map_err(|e| format!("connect: {e}"))
-}
-
-/// The `MIT-MAGIC-COOKIE-1` `(name, data)` for `dpy` from the `.Xauthority`-format file at `path`.
-///
-/// Entry layout, all integers big-endian: `u16 family`, then four length-prefixed byte strings —
-/// `address`, `number` (the display number in ASCII), `name`, `data`. An entry with an empty
-/// `number` matches any display.
-///
-/// Deliberately does NOT match on family/address, unlike libxcb's own lookup. A gamescope Xwayland
-/// gets its own single-entry cookie file, so there is nothing to disambiguate; and a wrong pick
-/// cannot do damage — the server rejects the cookie, and [`connect_conn`] falls back to the env
-/// path, which does the full match. Guessing the peer address for a `LOCAL`-family unix socket, on
-/// the other hand, is exactly the sort of detail that would rot.
-fn mit_magic_cookie(path: &str, dpy: &str) -> Option<(Vec<u8>, Vec<u8>)> {
-    let bytes = std::fs::read(path).ok()?;
-    let want = display_number(dpy);
-    // An entry whose `number` is empty matches any display — only used if no exact match is found.
-    let mut wildcard = None;
-    let mut p = 0usize;
-    'entries: while p + 2 <= bytes.len() {
-        p += 2; // family
-        let mut fields: [&[u8]; 4] = [&[]; 4];
-        for f in fields.iter_mut() {
-            let Some(lb) = bytes.get(p..p + 2) else {
-                break 'entries; // truncated — keep whatever we already found
-            };
-            let len = usize::from(u16::from_be_bytes([lb[0], lb[1]]));
-            p += 2;
-            let Some(v) = bytes.get(p..p + len) else {
-                break 'entries;
-            };
-            *f = v;
-            p += len;
-        }
-        let [_address, number, name, data] = fields;
-        if name != MIT_MAGIC_COOKIE_1 {
-            continue;
-        }
-        if want.as_deref().is_some_and(|w| number == w) {
-            return Some((name.to_vec(), data.to_vec()));
-        }
-        if number.is_empty() && wildcard.is_none() {
-            wildcard = Some((name.to_vec(), data.to_vec()));
-        }
-    }
-    wildcard
-}
-
-/// The display NUMBER of an X display string as ASCII bytes: `":2"`, `"host:2"` and `":2.0"` all
-/// yield `b"2"`. `None` when there is no numeric display component to match on.
-fn display_number(dpy: &str) -> Option<Vec<u8>> {
-    let num = dpy.rsplit_once(':')?.1.split('.').next()?;
-    (!num.is_empty() && num.bytes().all(|b| b.is_ascii_digit())).then(|| num.as_bytes().to_vec())
-}
-
-/// Read `GAMESCOPE_CURSOR_VISIBLE_FEEDBACK` off `root`. `None` = the property is absent or
-/// unreadable (not a gamescope that publishes it) — the caller then falls back to the pointer-motion
-/// heuristic rather than blanking the cursor, so an older gamescope keeps today's behaviour.
-fn read_cursor_feedback(conn: &RustConnection, root: Window, atom: Atom) -> Option<bool> {
-    if atom == 0 {
-        return None;
-    }
-    let reply = conn
-        .get_property(false, root, atom, AtomEnum::CARDINAL, 0, 1)
-        .ok()?
-        .reply()
-        .ok()?;
-    let value = reply.value32()?.next()?;
-    Some(value != 0)
-}
-
-/// One gamescope Xwayland the source tracks.
-struct XDisplay {
-    name: String,
-    conn: RustConnection,
-    root: Window,
-    /// The nested root's size in pixels — the space `QueryPointer` reports in, which is NOT
-    /// necessarily the captured frame's (see [`scale_to_frame`]).
-    root_size: (u16, u16),
-    /// Last polled pointer position — a change since the previous tick marks this display FOCUSED.
-    last_pos: Option<(i32, i32)>,
-    /// Cached cursor shape, refreshed only after this display's XFixes `CursorNotify`.
-    shape: Shape,
-    /// A `CursorNotify` (or first read) is pending — fetch the shape when this display is active.
-    need_shape: bool,
-    /// Interned [`GS_CURSOR_FEEDBACK`] atom (`0` = intern failed — treated as absent).
-    feedback_atom: Atom,
-    /// gamescope's verdict for THIS display: `Some(true)` = it is drawing the pointer here,
-    /// `Some(false)` = it is not, `None` = this gamescope publishes no verdict at all.
-    gs_visible: Option<bool>,
-    /// The X connection died (game/Xwayland exited) — skip it.
-    dead: bool,
-}
-
-impl XDisplay {
-    fn new(
-        name: String,
-        conn: RustConnection,
-        root: Window,
-        root_size: (u16, u16),
-        (feedback_atom, gs_visible): (Atom, Option<bool>),
-    ) -> Self {
-        XDisplay {
-            name,
-            conn,
-            root,
-            root_size,
-            last_pos: None,
-            shape: Shape::default(),
-            need_shape: true,
-            feedback_atom,
-            gs_visible,
-            dead: false,
-        }
-    }
-
-    /// Re-read gamescope's verdict, keeping a previously-seen one if the read fails (a transient
-    /// failure must not look like "this gamescope has no feedback" and re-arm the motion heuristic).
-    fn resync_feedback(&mut self) {
-        let fresh = read_cursor_feedback(&self.conn, self.root, self.feedback_atom);
-        if fresh.is_some() || self.gs_visible.is_none() {
-            self.gs_visible = fresh;
-        }
-    }
-}
-
-/// Cached cursor shape for one display.
-#[derive(Default)]
-struct Shape {
-    /// Straight-alpha RGBA (`w*h*4`, bytes R,G,B,A); empty before the first image arrives.
-    rgba: Arc<Vec<u8>>,
-    w: u32,
-    h: u32,
-    hot_x: u32,
-    hot_y: u32,
-    /// XFixes' own per-display cursor serial — bumps on every shape change.
-    serial: u64,
-    /// A hidden pointer arrives as an all-transparent image; kept so a position-only tick preserves
-    /// the last known visibility.
-    visible: bool,
-}
-
-/// Map a root-space pointer position into FRAME space.
-///
-/// `QueryPointer` answers in the nested root's coordinates, but `CursorOverlay::x/y`'s contract is
-/// FRAME pixels — and gamescope's `-w/-h` (nested root) and `-W/-H` (output + PipeWire node) are
-/// independent knobs. Measured on this box with gamescope 3.16.23 at `-W 1280 -H 720 -w 640 -h 360`
-/// the two spaces differ by 2×, so publishing root coordinates verbatim drew the pointer at a
-/// fraction of its real position. `frame` is `(0, 0)` until the PipeWire format negotiates, in which
-/// case the position passes through unscaled — the same as before, and correct for the common case
-/// where the two spaces agree.
-///
-/// The cursor BITMAP is not scaled: it stays at the shape's native size, so on a mismatched session
-/// the pointer lands in the right place but is drawn at root scale.
-fn scale_to_frame((x, y): (i32, i32), root: (u16, u16), frame: (u32, u32)) -> (i32, i32) {
-    let (rw, rh) = (u32::from(root.0), u32::from(root.1));
-    let (fw, fh) = frame;
-    if rw == 0 || rh == 0 || fw == 0 || fh == 0 || (rw, rh) == (fw, fh) {
-        return (x, y);
-    }
-    (
-        ((i64::from(x) * i64::from(fw)) / i64::from(rw)) as i32,
-        ((i64::from(y) * i64::from(fh)) / i64::from(rh)) as i32,
-    )
-}
-
-fn run(
-    mut displays: Vec<XDisplay>,
-    slot: Arc<Mutex<Option<CursorOverlay>>>,
-    stop: Arc<AtomicBool>,
-    targets: GamescopeCursorTargets,
-    frame_size: Arc<AtomicU64>,
-) {
-    let mut last_discover = std::time::Instant::now();
-    let mut warned_scale = false;
-    let mut active = 0usize;
-    // The overlay serial must bump whenever the DRAWN cursor changes — either the active display's
-    // shape OR which display is active (per-display XFixes serials aren't comparable across
-    // displays, so switching could reuse a number and the encoder would keep the old texture).
-    let mut out_serial = 0u64;
-    let mut last_key = (usize::MAX, u64::MAX);
-    let mut warned_image = false;
-    let mut last_resync = std::time::Instant::now();
-
-    while !stop.load(Ordering::Relaxed) {
-        // A missed/coalesced PropertyNotify would otherwise strand the verdict — re-read on a slow
-        // cadence so the source always converges (also picks the atom up if gamescope adds it late).
-        let resync = last_resync.elapsed() >= FEEDBACK_RESYNC;
-        if resync {
-            last_resync = std::time::Instant::now();
-        }
-        // Adopt Xwaylands that appeared since we started (a game's, above all) and retry dead ones.
-        if last_discover.elapsed() >= REDISCOVER {
-            last_discover = std::time::Instant::now();
-            rediscover(&mut displays, &targets, false);
-        }
-
-        // 1) Poll every display's pointer; note which moved since last tick (the fallback focus
-        //    signal, used only when this gamescope publishes no cursor verdict).
-        let mut active_moved = false;
-        let mut other_moved: Option<usize> = None;
-        for (i, d) in displays.iter_mut().enumerate() {
-            if d.dead {
-                continue;
-            }
-            // Drain pending events. Two kinds are selected: XFixes CursorNotify (the shape
-            // changed) and root PropertyNotify (gamescope republished its cursor verdict, among
-            // the many other properties it keeps on the root — hence the atom match).
-            let mut need_feedback = resync;
-            loop {
-                match d.conn.poll_for_event() {
-                    Ok(Some(Event::XfixesCursorNotify(_))) => d.need_shape = true,
-                    Ok(Some(Event::PropertyNotify(ev))) => {
-                        need_feedback |= d.feedback_atom != 0 && ev.atom == d.feedback_atom;
-                    }
-                    Ok(Some(_)) => {}
-                    Ok(None) => break,
-                    Err(_) => {
-                        d.dead = true;
-                        break;
-                    }
-                }
-            }
-            if need_feedback && !d.dead {
-                d.resync_feedback();
-            }
-            match fetch_pointer(&d.conn, d.root) {
-                Ok(p) if p.same_screen => {
-                    let pos = (i32::from(p.root_x), i32::from(p.root_y));
-                    let moved = d.last_pos.is_some_and(|lp| lp != pos);
-                    d.last_pos = Some(pos);
-                    if moved {
-                        if i == active {
-                            active_moved = true;
-                        } else if other_moved.is_none() {
-                            other_moved = Some(i);
-                        }
-                    }
-                }
-                Ok(_) => {} // pointer on another screen — keep the last position.
-                Err(_) => d.dead = true,
-            }
-        }
-
-        // 2) Pick the display to publish from, and decide whether a pointer should be drawn at all.
-        let states: Vec<(bool, Option<bool>)> =
-            displays.iter().map(|d| (d.dead, d.gs_visible)).collect();
-        let hidden_by_gamescope;
-        (active, hidden_by_gamescope) = pick_active(&states, active, active_moved, other_moved);
-        if displays.get(active).is_none_or(|d| d.dead) {
-            match displays.iter().position(|d| !d.dead) {
-                Some(k) => active = k,
-                None => {
-                    std::thread::sleep(POLL); // all connections dead — idle until Drop.
-                    continue;
-                }
-            }
-        }
-
-        // 3) Fetch the active display's shape if a CursorNotify (or a focus switch) left it stale.
-        if displays[active].need_shape {
-            match fetch_cursor_image(&displays[active].conn) {
-                Ok(img) => {
-                    update_shape(&mut displays[active].shape, &img);
-                    displays[active].need_shape = false;
-                }
-                Err(e) => {
-                    if !warned_image {
-                        warned_image = true;
-                        tracing::warn!(error = %e, "gamescope cursor: GetCursorImage failed — retrying");
-                    }
-                }
-            }
-        }
-
-        // 4) Publish the ACTIVE display's pointer + shape (or clear the slot when it has no cursor
-        //    of its own — so a focus switch never leaves the other display's stale pointer showing).
-        //    A pointer gamescope is not drawing is published `visible: false`, NOT dropped: the
-        //    encode loop overwrites the frame's overlay from this slot and strips invisible ones, so
-        //    a `None` here would leave the last visible overlay standing on repeat frames.
-        let d = &displays[active];
-        let drawn = d.shape.visible && !hidden_by_gamescope;
-        // Root space → frame space (see `scale_to_frame`). The negotiated size arrives from the
-        // PipeWire thread's `param_changed`, packed `(w << 32) | h`; `0` = not negotiated yet.
-        let packed = frame_size.load(Ordering::Relaxed);
-        let frame = ((packed >> 32) as u32, packed as u32);
-        if !warned_scale
-            && frame.0 != 0
-            && (u32::from(d.root_size.0), u32::from(d.root_size.1)) != frame
-        {
-            warned_scale = true;
-            tracing::warn!(
-                dpy = %d.name,
-                root = %format!("{}x{}", d.root_size.0, d.root_size.1),
-                negotiated = %format!("{}x{}", frame.0, frame.1),
-                "gamescope cursor: the nested root and the captured frame are different sizes \
-                 (gamescope -w/-h vs -W/-H) — scaling the pointer POSITION into frame space; the \
-                 cursor bitmap stays at root scale"
-            );
-        }
-        let overlay = match (d.last_pos, d.shape.rgba.is_empty()) {
-            (Some(pos), false) => {
-                let (px, py) = scale_to_frame(pos, d.root_size, frame);
-                let key = (active, d.shape.serial);
-                if key != last_key {
-                    out_serial += 1;
-                    last_key = key;
-                }
-                Some(CursorOverlay {
-                    // Top-left = pointer position − hotspot (the overlay contract).
-                    x: px - d.shape.hot_x as i32,
-                    y: py - d.shape.hot_y as i32,
-                    w: d.shape.w,
-                    h: d.shape.h,
-                    rgba: Arc::clone(&d.shape.rgba),
-                    serial: out_serial,
-                    hot_x: d.shape.hot_x,
-                    hot_y: d.shape.hot_y,
-                    visible: drawn,
-                })
-            }
-            _ => None,
-        };
-        if let Ok(mut s) = slot.lock() {
-            *s = overlay;
-        }
-
-        std::thread::sleep(POLL);
-    }
-}
-
-/// Which display to publish from, and whether gamescope is drawing NO pointer right now —
-/// `(active, hidden)`. `states` is one `(dead, gs_visible)` per display, in `displays` order.
-///
-/// PREFERRED: gamescope's own verdict. It is authoritative for a STATIC pointer, which is exactly
-/// the case motion cannot read — a game grabs the pointer, gamescope parks it in the bottom-right
-/// corner, and "follow whichever moved" then never switches again (see the module docs).
-///
-/// FALLBACK, only when NO live display publishes the verdict: the original motion heuristic —
-/// sticky to the active display while its pointer moves (no flapping), else follow another that
-/// moved. `hidden` is never asserted on this path, so an older gamescope keeps today's behaviour.
-fn pick_active(
-    states: &[(bool, Option<bool>)],
-    active: usize,
-    active_moved: bool,
-    other_moved: Option<usize>,
-) -> (usize, bool) {
-    let live = |&(dead, _): &(bool, Option<bool>)| !dead;
-    if states.iter().filter(|s| live(s)).any(|(_, v)| v.is_some()) {
-        return match states.iter().position(|s| live(s) && s.1 == Some(true)) {
-            // gamescope is drawing the pointer here — publish from it.
-            Some(i) => (i, false),
-            // Drawing none of them (a game grabbed it, or the idle auto-hide fired). Keep `active`
-            // so the shape cache and last position stay warm for the re-show; the caller publishes
-            // the overlay `visible: false` instead of dropping it.
-            None => (active, true),
-        };
-    }
-    match other_moved {
-        Some(j) if !active_moved => (j, false),
-        _ => (active, false),
-    }
-}
-
-/// Update `shape` from a fresh `GetCursorImage` reply. A hidden pointer (all-transparent) keeps the
-/// last bitmap (instant re-show) but flips visibility; the serial still bumps so the change shows.
-fn update_shape(shape: &mut Shape, img: &GetCursorImageReply) {
-    let visible =
-        img.width > 0 && img.height > 0 && img.cursor_image.iter().any(|&p| (p >> 24) & 0xff != 0);
-    if visible {
-        shape.rgba = Arc::new(argb_premul_to_straight_rgba(&img.cursor_image));
-        shape.w = u32::from(img.width);
-        shape.h = u32::from(img.height);
-        shape.hot_x = u32::from(img.xhot);
-        shape.hot_y = u32::from(img.yhot);
-    }
-    shape.visible = visible;
-    shape.serial = u64::from(img.cursor_serial);
-}
-
-/// One request+reply — x11rb splits errors (the request is `ConnectionError`, `reply()` is
-/// `ReplyError` which is `From<ConnectionError>`), so the request `?` converts into the reply error.
-fn fetch_cursor_image(conn: &RustConnection) -> Result<GetCursorImageReply, ReplyError> {
-    conn.xfixes_get_cursor_image()?.reply()
-}
-
-fn fetch_pointer(conn: &RustConnection, root: Window) -> Result<QueryPointerReply, ReplyError> {
-    conn.query_pointer(root)?.reply()
-}
-
-/// XFixes cursor pixels are packed `0xAARRGGBB` with **premultiplied** alpha (the Xrender / Xcursor
-/// convention). The overlay + both blend paths want **straight** alpha RGBA (R,G,B,A bytes), like
-/// the `SPA_META_Cursor` path — so un-premultiply here. (If on-glass shows over-bright fringes the
-/// source wasn't premultiplied after all; drop the divide.)
-fn argb_premul_to_straight_rgba(argb: &[u32]) -> Vec<u8> {
-    let mut out = Vec::with_capacity(argb.len() * 4);
-    for &px in argb {
-        let a = (px >> 24) & 0xff;
-        let r = (px >> 16) & 0xff;
-        let g = (px >> 8) & 0xff;
-        let b = px & 0xff;
-        let (r, g, b) = match a {
-            0 => (0, 0, 0),
-            255 => (r, g, b),
-            a => (
-                ((r * 255 + a / 2) / a).min(255),
-                ((g * 255 + a / 2) / a).min(255),
-                ((b * 255 + a / 2) / a).min(255),
-            ),
-        };
-        out.extend_from_slice(&[r as u8, g as u8, b as u8, a as u8]);
-    }
-    out
-}
-
-#[cfg(test)]
-mod tests {
-    use super::{
-        display_number, mit_magic_cookie, pick_active, scale_to_frame, MIT_MAGIC_COOKIE_1,
-    };
-
-    /// One `.Xauthority` entry in wire form: `u16 family` + four length-prefixed byte strings.
-    fn entry(family: u16, address: &[u8], number: &[u8], name: &[u8], data: &[u8]) -> Vec<u8> {
-        let mut v = family.to_be_bytes().to_vec();
-        for f in [address, number, name, data] {
-            v.extend_from_slice(&(f.len() as u16).to_be_bytes());
-            v.extend_from_slice(f);
-        }
-        v
-    }
-
-    fn write_xauth(bytes: &[u8]) -> std::path::PathBuf {
-        // The scratch file lives beside the test binary's temp dir; unique per call via the address
-        // of a local (no rand dependency, and the tests do not run concurrently on one path).
-        let mut p = std::env::temp_dir();
-        let uniq = format!(
-            "pf-xauth-test-{}-{:p}",
-            std::process::id(),
-            bytes as *const [u8]
-        );
-        p.push(uniq);
-        std::fs::write(&p, bytes).expect("write scratch xauth");
-        p
-    }
-
-    #[test]
-    fn display_number_handles_every_display_spelling() {
-        assert_eq!(display_number(":2").as_deref(), Some(&b"2"[..]));
-        assert_eq!(display_number(":2.0").as_deref(), Some(&b"2"[..]));
-        assert_eq!(display_number("host:13.1").as_deref(), Some(&b"13"[..]));
-        // Nothing to match on — the caller then accepts only a wildcard entry.
-        assert_eq!(display_number("bogus"), None);
-        assert_eq!(display_number(":"), None);
-        assert_eq!(display_number(":abc"), None);
-    }
-
-    /// The cookie reader is the one PARSER in this file fed a file we did not write, so it gets the
-    /// hostile-input treatment: exact-match, wildcard fallback, skipping other auth protocols, and
-    /// truncation.
-    #[test]
-    fn mit_magic_cookie_picks_the_matching_entry() {
-        let mut file = Vec::new();
-        // A different protocol on the display we want — must be skipped, not returned.
-        file.extend(entry(256, b"host", b"2", b"XDM-AUTHORIZATION-1", b"nope"));
-        // Another display's cookie.
-        file.extend(entry(
-            256,
-            b"host",
-            b"7",
-            MIT_MAGIC_COOKIE_1,
-            b"other-display",
-        ));
-        // Ours.
-        file.extend(entry(256, b"host", b"2", MIT_MAGIC_COOKIE_1, b"the-cookie"));
-        let p = write_xauth(&file);
-        let got = mit_magic_cookie(p.to_str().unwrap(), ":2");
-        assert_eq!(
-            got,
-            Some((MIT_MAGIC_COOKIE_1.to_vec(), b"the-cookie".to_vec()))
-        );
-        // A display with no entry at all yields nothing (⇒ the caller falls back to the env path).
-        assert_eq!(mit_magic_cookie(p.to_str().unwrap(), ":9"), None);
-        let _ = std::fs::remove_file(p);
-    }
-
-    #[test]
-    fn mit_magic_cookie_falls_back_to_a_wildcard_entry() {
-        // An empty `number` matches any display — but an exact match still wins.
-        let mut file = entry(256, b"host", b"", MIT_MAGIC_COOKIE_1, b"wildcard");
-        file.extend(entry(256, b"host", b"3", MIT_MAGIC_COOKIE_1, b"exact"));
-        let p = write_xauth(&file);
-        let path = p.to_str().unwrap();
-        assert_eq!(
-            mit_magic_cookie(path, ":3").map(|(_, d)| d),
-            Some(b"exact".to_vec())
-        );
-        assert_eq!(
-            mit_magic_cookie(path, ":4").map(|(_, d)| d),
-            Some(b"wildcard".to_vec())
-        );
-        let _ = std::fs::remove_file(p);
-    }
-
-    #[test]
-    fn a_truncated_xauthority_keeps_what_it_already_parsed() {
-        let mut file = entry(256, b"host", b"", MIT_MAGIC_COOKIE_1, b"wildcard");
-        // A second entry cut off mid-length-prefix.
-        file.extend(entry(256, b"host", b"5", MIT_MAGIC_COOKIE_1, b"truncated"));
-        file.truncate(file.len() - 4);
-        let p = write_xauth(&file);
-        // No panic, no over-read: the wildcard found before the truncation still serves.
-        assert_eq!(
-            mit_magic_cookie(p.to_str().unwrap(), ":5").map(|(_, d)| d),
-            Some(b"wildcard".to_vec())
-        );
-        let _ = std::fs::remove_file(p);
-    }
-
-    #[test]
-    fn a_garbage_xauthority_is_declined_not_fatal() {
-        // A length prefix that claims far more than the file holds.
-        let p = write_xauth(&[0, 0, 0xff, 0xff, 1, 2, 3]);
-        assert_eq!(mit_magic_cookie(p.to_str().unwrap(), ":0"), None);
-        let _ = std::fs::remove_file(p);
-        // A missing file is simply "no cookie".
-        assert_eq!(mit_magic_cookie("/nonexistent/pf-xauth", ":0"), None);
-    }
-
-    /// L6: gamescope's `-w/-h` (nested root, the space `QueryPointer` answers in) and `-W/-H`
-    /// (output + PipeWire node, the space `CursorOverlay` is contracted in) are independent.
-    #[test]
-    fn pointer_positions_are_mapped_into_frame_space() {
-        // The measured case: root 640x360 inside a 1280x720 output — 2x.
-        assert_eq!(
-            scale_to_frame((320, 180), (640, 360), (1280, 720)),
-            (640, 360)
-        );
-        assert_eq!(scale_to_frame((0, 0), (640, 360), (1280, 720)), (0, 0));
-        // Down-scaling works the same way.
-        assert_eq!(
-            scale_to_frame((1280, 720), (1280, 720), (640, 360)),
-            (640, 360)
-        );
-        // Equal spaces are a pass-through (the common case — no rounding drift).
-        assert_eq!(scale_to_frame((7, 9), (1920, 1080), (1920, 1080)), (7, 9));
-        // Not negotiated yet, or a degenerate root: pass through rather than divide by zero.
-        assert_eq!(scale_to_frame((7, 9), (1920, 1080), (0, 0)), (7, 9));
-        assert_eq!(scale_to_frame((7, 9), (0, 0), (1920, 1080)), (7, 9));
-    }
-
-    /// A 5K frame times a 5K coordinate overflows `i32` — the scale must be computed wide.
-    #[test]
-    fn scaling_does_not_overflow_at_5k() {
-        assert_eq!(
-            scale_to_frame((2879, 1619), (2880, 1620), (5120, 2880)),
-            (5118, 2878)
-        );
-    }
-
-    /// Steam Gaming Mode shape: display 0 = Big Picture's Xwayland, 1 = the game's.
-    const BPM: usize = 0;
-    const GAME: usize = 1;
-
-    #[test]
-    fn follows_the_display_gamescope_draws_on() {
-        // Verdict beats motion: gamescope says the game's Xwayland owns the pointer, so we publish
-        // from it even though only BPM's (parked) pointer looks like it moved.
-        let states = [(false, Some(false)), (false, Some(true))];
-        assert_eq!(pick_active(&states, BPM, false, Some(BPM)), (GAME, false));
-    }
-
-    /// THE REGRESSION: gamescope hides the pointer by warping it to the root's bottom-right corner
-    /// and leaves the opaque arrow as the X cursor. Nothing moves ever again, so the motion
-    /// heuristic stayed on the parked display and composited that arrow at (w-1, h-1) — a sliver of
-    /// cursor welded to the corner of the stream for the whole session, in every game.
-    #[test]
-    fn a_pointer_gamescope_draws_nowhere_is_hidden_not_parked() {
-        let states = [(false, Some(false)), (false, Some(false))];
-        // `active` is kept (shape cache + last position stay warm for the re-show) but hidden.
-        assert_eq!(pick_active(&states, GAME, false, None), (GAME, true));
-    }
-
-    #[test]
-    fn re_show_returns_to_the_drawing_display() {
-        let states = [(false, Some(true)), (false, Some(false))];
-        assert_eq!(pick_active(&states, GAME, false, None), (BPM, false));
-    }
-
-    #[test]
-    fn a_dead_displays_verdict_is_ignored() {
-        // The game's Xwayland exited mid-session with a stale `Some(true)`; BPM is the live one.
-        let states = [(false, Some(true)), (true, Some(true))];
-        assert_eq!(pick_active(&states, GAME, false, None), (BPM, false));
-        // …and a dead display's `Some` must not count as "this gamescope publishes a verdict",
-        // which would blank the cursor forever on a gamescope that publishes none.
-        let states = [(false, None), (true, Some(false))];
-        assert_eq!(pick_active(&states, BPM, false, Some(GAME)), (GAME, false));
-    }
-
-    #[test]
-    fn no_verdict_falls_back_to_the_motion_heuristic() {
-        let none = [(false, None), (false, None)];
-        // Sticky while the active display's own pointer moves…
-        assert_eq!(pick_active(&none, BPM, true, Some(GAME)), (BPM, false));
-        // …otherwise follow the one that moved…
-        assert_eq!(pick_active(&none, BPM, false, Some(GAME)), (GAME, false));
-        // …and never assert `hidden` on this path (that would regress an older gamescope to a
-        // cursorless stream).
-        assert_eq!(pick_active(&none, BPM, false, None), (BPM, false));
-    }
-}
@@ -1,648 +0,0 @@
-//! The P010 colour SELF-TEST and its helpers — the `hdr-p010-selftest` subcommand's whole
-//! implementation, plus the f64 reference math it compares against and the f16 encoder it uploads
-//! with.
-//!
-//! Split out of `windows/dxgi.rs` in sweep Phase 5.5: it was ~560 of that file's 1,374 lines and
-//! none of it runs in a session. What remains in the parent is the production path (the win32u hook,
-//! the shader sources, the three converters); this is the validation path.
-//!
-//! `hdr_p010_selftest_at` and `hdr_p010_convert_bars_on_luid` are re-exported by the parent, so
-//! every existing `crate::capture::dxgi::…` / `pf_capture::dxgi::…` path keeps resolving.
-
-use super::*;
-
-/// f64 reference for the P010 colour math — the EXACT analogue of the HLSL in [`HDR_P010_COMMON`].
-/// Input is one scRGB pixel (linear, Rec.709 primaries, 1.0 = 80 nits, may be >1 for HDR). Output is
-/// the 10-bit studio-range (Y, Cb, Cr) codes the shader should produce for a flat (constant) block.
-/// Used by [`hdr_p010_selftest`].
-#[cfg(target_os = "windows")]
-fn p010_reference(r: f64, g: f64, b: f64) -> (f64, f64, f64) {
-    fn pq_oetf(l: f64) -> f64 {
-        let l = l.clamp(0.0, 1.0);
-        let m1 = 0.1593017578125;
-        let m2 = 78.84375;
-        let c1 = 0.8359375;
-        let c2 = 18.8515625;
-        let c3 = 18.6875;
-        let lp = l.powf(m1);
-        ((c1 + c2 * lp) / (1.0 + c3 * lp)).powf(m2)
-    }
-    // scRGB -> nits -> BT.2020 linear (row-major matrix, mul(M, v)).
-    let (r, g, b) = (r.max(0.0) * 80.0, g.max(0.0) * 80.0, b.max(0.0) * 80.0);
-    let m = [
-        [0.627403914, 0.329283038, 0.043313048],
-        [0.069097292, 0.919540405, 0.011362303],
-        [0.016391439, 0.088013308, 0.895595253],
-    ];
-    let lr = m[0][0] * r + m[0][1] * g + m[0][2] * b;
-    let lg = m[1][0] * r + m[1][1] * g + m[1][2] * b;
-    let lb = m[2][0] * r + m[2][1] * g + m[2][2] * b;
-    // PQ encode (normalize to 10k nits).
-    let pr = pq_oetf(lr / 10000.0);
-    let pg = pq_oetf(lg / 10000.0);
-    let pb = pq_oetf(lb / 10000.0);
-    // BT.2020 non-constant-luminance, limited 10-bit.
-    let (kr, kg, kb) = (0.2627, 0.6780, 0.0593);
-    let y = kr * pr + kg * pg + kb * pb;
-    let cb = (pb - y) / 1.8814;
-    let cr = (pr - y) / 1.4746;
-    let yc = (64.0 + 876.0 * y).clamp(64.0, 940.0);
-    let cbc = (512.0 + 896.0 * cb).clamp(64.0, 960.0);
-    let crc = (512.0 + 896.0 * cr).clamp(64.0, 960.0);
-    (yc, cbc, crc)
-}
-
-/// Test support (used by pf-encode's live e2e): the 8 sRGB colour bars (white/yellow/cyan/green/
-/// magenta/red/blue/black, sRGB 1.0 = scRGB 1.0 = 80 nits) as a w×h FP16 scRGB texture on the
-/// adapter with `luid`, converted through the REAL [`HdrP010Converter`] into a P010 texture with
-/// **`BIND_RENDER_TARGET` only, `MiscFlags` 0 — the exact bind profile of the IDD out-ring** (the
-/// CPU-upload encoder tests can't use that profile, so only this path exercises "RTV-written P010
-/// → encoder ingest copy"). Returns `(device, p010)`; expected decoded codes per bar are the
-/// bars_pq2020 fixture's: (490,512,512) (478,423,518) (464,525,473) (450,432,476) (350,584,585)
-/// (325,448,598) (226,650,535) (64,512,512).
-#[cfg(target_os = "windows")]
-#[doc(hidden)]
-pub fn hdr_p010_convert_bars_on_luid(
-    luid: [u8; 8],
-    w: u32,
-    h: u32,
-) -> Result<(ID3D11Device, ID3D11Texture2D)> {
-    use windows::Win32::Graphics::Direct3D::D3D_DRIVER_TYPE_UNKNOWN;
-    use windows::Win32::Graphics::Dxgi::{CreateDXGIFactory1, IDXGIAdapter1, IDXGIFactory4};
-
-    if w == 0 || h == 0 || w % 2 != 0 || h % 2 != 0 {
-        bail!("bars pattern needs even non-zero dimensions, got {w}x{h}");
-    }
-    // sRGB primaries at full/zero channels: sRGB EOTF(1.0)=1.0, (0)=0 → the scRGB pattern is
-    // pure 0/1 floats and the PQ/BT.2020 reference codes above are exact.
-    const BARS: [(f32, f32, f32); 8] = [
-        (1.0, 1.0, 1.0),
-        (1.0, 1.0, 0.0),
-        (0.0, 1.0, 1.0),
-        (0.0, 1.0, 0.0),
-        (1.0, 0.0, 1.0),
-        (1.0, 0.0, 0.0),
-        (0.0, 0.0, 1.0),
-        (0.0, 0.0, 0.0),
-    ];
-    let bar_w = (w / 8).max(1) as usize;
-    let mut fp16 = vec![0u16; (w * h * 4) as usize];
-    for y in 0..h as usize {
-        for x in 0..w as usize {
-            let (r, g, b) = BARS[(x / bar_w).min(7)];
-            let i = (y * w as usize + x) * 4;
-            fp16[i] = f32_to_f16(r);
-            fp16[i + 1] = f32_to_f16(g);
-            fp16[i + 2] = f32_to_f16(b);
-            fp16[i + 3] = f32_to_f16(1.0);
-        }
-    }
-    // SAFETY: same single-device/single-thread contract as `hdr_p010_selftest_at`; the FP16
-    // initial-data Vec outlives the synchronous CreateTexture2D; the returned COM handles own
-    // their references.
-    unsafe {
-        let luid = windows::Win32::Foundation::LUID {
-            LowPart: u32::from_le_bytes(luid[..4].try_into().unwrap()),
-            HighPart: i32::from_le_bytes(luid[4..].try_into().unwrap()),
-        };
-        let factory: IDXGIFactory4 = CreateDXGIFactory1().context("dxgi factory")?;
-        let adapter: IDXGIAdapter1 = factory.EnumAdapterByLuid(luid).context("adapter by luid")?;
-        let mut device: Option<ID3D11Device> = None;
-        let mut context: Option<ID3D11DeviceContext> = None;
-        D3D11CreateDevice(
-            &adapter,
-            D3D_DRIVER_TYPE_UNKNOWN,
-            HMODULE::default(),
-            D3D11_CREATE_DEVICE_BGRA_SUPPORT,
-            Some(&[D3D_FEATURE_LEVEL_11_0]),
-            D3D11_SDK_VERSION,
-            Some(&mut device),
-            None,
-            Some(&mut context),
-        )
-        .context("D3D11CreateDevice(luid) for bars convert")?;
-        let device = device.context("null device")?;
-        let context = context.context("null context")?;
-
-        let src_desc = D3D11_TEXTURE2D_DESC {
-            Width: w,
-            Height: h,
-            MipLevels: 1,
-            ArraySize: 1,
-            Format: DXGI_FORMAT_R16G16B16A16_FLOAT,
-            SampleDesc: DXGI_SAMPLE_DESC {
-                Count: 1,
-                Quality: 0,
-            },
-            Usage: D3D11_USAGE_DEFAULT,
-            BindFlags: D3D11_BIND_SHADER_RESOURCE.0 as u32,
-            ..Default::default()
-        };
-        let init = D3D11_SUBRESOURCE_DATA {
-            pSysMem: fp16.as_ptr() as *const c_void,
-            SysMemPitch: w * 8,
-            SysMemSlicePitch: 0,
-        };
-        let mut src_tex: Option<ID3D11Texture2D> = None;
-        device
-            .CreateTexture2D(&src_desc, Some(&init), Some(&mut src_tex))
-            .context("CreateTexture2D(fp16 bars)")?;
-        let src_tex = src_tex.context("null src tex")?;
-        let mut src_srv: Option<ID3D11ShaderResourceView> = None;
-        device
-            .CreateShaderResourceView(&src_tex, None, Some(&mut src_srv))
-            .context("CreateShaderResourceView(fp16 bars)")?;
-        let src_srv = src_srv.context("null src srv")?;
-
-        // The IDD out-ring's exact profile: P010, RENDER_TARGET only, MiscFlags 0.
-        let p010_desc = D3D11_TEXTURE2D_DESC {
-            Width: w,
-            Height: h,
-            MipLevels: 1,
-            ArraySize: 1,
-            Format: DXGI_FORMAT_P010,
-            SampleDesc: DXGI_SAMPLE_DESC {
-                Count: 1,
-                Quality: 0,
-            },
-            Usage: D3D11_USAGE_DEFAULT,
-            BindFlags: D3D11_BIND_RENDER_TARGET.0 as u32,
-            ..Default::default()
-        };
-        let mut p010: Option<ID3D11Texture2D> = None;
-        device
-            .CreateTexture2D(&p010_desc, None, Some(&mut p010))
-            .context("CreateTexture2D(P010 bars dst)")?;
-        let p010 = p010.context("null p010 tex")?;
-
-        let conv = HdrP010Converter::new(&device, w, h)?;
-        let y_rtv = HdrP010Converter::plane_rtv(&device, &p010, DXGI_FORMAT_R16_UNORM)?;
-        let uv_rtv = HdrP010Converter::plane_rtv(&device, &p010, DXGI_FORMAT_R16G16_UNORM)?;
-        conv.convert(&context, &src_srv, &y_rtv, &uv_rtv, w, h)?;
-        Ok((device, p010))
-    }
-}
-
-/// Colour self-test for [`HdrP010Converter`] (the `hdr-p010-selftest` subcommand): create a hardware
-/// D3D11 device, upload a known scRGB FP16 pattern, run the P010 shader passes, read the Y (plane 0)
-/// and UV (plane 1) planes back from a staging copy, and compare against the [`p010_reference`] f64
-/// math. The ONLY validation we have without green-screening a live HDR stream. PASS if max abs error
-/// Y ≤ 4 codes, U/V ≤ 5 codes (rounding + chroma averaging). Prints a per-colour table + PASS/FAIL.
-///
-/// `w`/`h` must be even and non-zero. Run it at the FIELD capture size, not a toy one: sessions run
-/// at resolutions whose height is not 16-aligned (1080 → the encoder's align16 pool seam) and a
-/// driver may treat the planar RTVs differently at real sizes. `vendor` pins the adapter by PCI
-/// vendor id (`0x8086` Intel / `0x10de` NVIDIA / `0x1002` AMD) — it matters on dual-GPU boxes where
-/// the default adapter is not the one the session encodes on. The chosen adapter is always printed,
-/// because a PASS only means anything for the GPU it actually ran on.
-#[cfg(target_os = "windows")]
-pub fn hdr_p010_selftest_at(w: u32, h: u32, vendor: Option<u32>) -> Result<()> {
-    use windows::Win32::Graphics::Direct3D::{D3D_DRIVER_TYPE_HARDWARE, D3D_DRIVER_TYPE_UNKNOWN};
-    use windows::Win32::Graphics::Dxgi::{CreateDXGIFactory1, IDXGIAdapter, IDXGIFactory1};
-
-    if w == 0 || h == 0 || w % 2 != 0 || h % 2 != 0 {
-        bail!("hdr-p010-selftest needs even non-zero dimensions, got {w}x{h}");
-    }
-    // A grid of 16x16 flat scRGB blocks (each 2x2 chroma footprint uniform → exact chroma
-    // comparison) covering pure R/G/B/white/black/gray at plausible HDR nit levels, plus a couple
-    // of bright (>1.0 scRGB) colours, then the rest is a gradient (compared on Y only).
-    #[allow(non_snake_case)]
-    let (W, H) = (w, h);
-    const BLK: u32 = 16;
-    // (name, r, g, b) scRGB linear (1.0 = 80 nits). Mix of SDR-ish and HDR (>1.0) values.
-    let named: [(&str, f32, f32, f32); 8] = [
-        ("red1.0", 1.0, 0.0, 0.0),
-        ("green0.5", 0.0, 0.5, 0.0),
-        ("blue4.0", 0.0, 0.0, 4.0),
-        ("white1.0", 1.0, 1.0, 1.0),
-        ("black", 0.0, 0.0, 0.0),
-        ("gray0.5", 0.5, 0.5, 0.5),
-        ("white4.0", 4.0, 4.0, 4.0),
-        ("amber2.0", 2.0, 1.0, 0.0),
-    ];
-
-    let grid_cols = W / BLK; // 4
-    let pixel_rgb = |x: u32, y: u32| -> (f32, f32, f32, bool) {
-        let idx = ((y / BLK) * grid_cols + (x / BLK)) as usize;
-        if idx < named.len() {
-            let (_, r, g, b) = named[idx];
-            (r, g, b, true)
-        } else {
-            // Gradient (distinct per pixel; Y-only compare), within HDR scRGB range.
-            let r = (x as f32 / W as f32) * 3.0;
-            let g = (y as f32 / H as f32) * 3.0;
-            let b = ((x + y) as f32 / (W + H) as f32) * 3.0;
-            (r, g, b, false)
-        }
-    };
-
-    // Build the scRGB FP16 (R16G16B16A16_FLOAT) source as f16 bits.
-    let mut fp16 = vec![0u16; (W * H * 4) as usize];
-    let mut flat = vec![false; (W * H) as usize];
-    for y in 0..H {
-        for x in 0..W {
-            let (r, g, b, is_flat) = pixel_rgb(x, y);
-            let i = ((y * W + x) * 4) as usize;
-            fp16[i] = f32_to_f16(r);
-            fp16[i + 1] = f32_to_f16(g);
-            fp16[i + 2] = f32_to_f16(b);
-            fp16[i + 3] = f32_to_f16(1.0);
-            flat[(y * W + x) as usize] = is_flat;
-        }
-    }
-
-    // SAFETY: this self-test creates its own D3D11 device + immediate context (`D3D11CreateDevice`,
-    // both checked non-null) and uses ONLY that device for the rest of the block: every
-    // `CreateTexture2D`/`CreateShaderResourceView`/`HdrP010Converter::{new,convert}`/`CopyResource`/
-    // `Map` is invoked on that device or its context, so all resources share one device and run on this
-    // single thread. The source texture's `D3D11_SUBRESOURCE_DATA` points at `fp16`, a live
-    // `Vec<u16>` of `W*H*4` samples with `SysMemPitch = W*8`, matching the W×H R16G16B16A16 texture;
-    // `fp16` outlives the synchronous `CreateTexture2D` that reads it. The mapped-pointer reads are
-    // proven individually at the `read_u16` closure below.
-    unsafe {
-        // Device on the requested vendor's adapter (dual-GPU boxes encode on a specific one), else
-        // the default hardware GPU. Always says which adapter ran — a PASS is only meaningful for
-        // the GPU it actually tested.
-        let adapter: Option<IDXGIAdapter> = match vendor {
-            None => None,
-            Some(want) => {
-                let factory: IDXGIFactory1 = CreateDXGIFactory1().context("dxgi factory")?;
-                let mut found = None;
-                for i in 0.. {
-                    let Ok(a) = factory.EnumAdapters(i) else {
-                        break;
-                    };
-                    let desc = a.GetDesc().context("adapter desc")?;
-                    if desc.VendorId == want {
-                        found = Some(a);
-                        break;
-                    }
-                }
-                Some(found.with_context(|| format!("no adapter with vendor id {want:#x}"))?)
-            }
-        };
-        let mut device: Option<ID3D11Device> = None;
-        let mut context: Option<ID3D11DeviceContext> = None;
-        D3D11CreateDevice(
-            adapter.as_ref(),
-            if adapter.is_some() {
-                D3D_DRIVER_TYPE_UNKNOWN
-            } else {
-                D3D_DRIVER_TYPE_HARDWARE
-            },
-            HMODULE::default(),
-            D3D11_CREATE_DEVICE_BGRA_SUPPORT,
-            Some(&[D3D_FEATURE_LEVEL_11_0]),
-            D3D11_SDK_VERSION,
-            Some(&mut device),
-            None,
-            Some(&mut context),
-        )
-        .context("D3D11CreateDevice(hardware) for hdr-p010-selftest")?;
-        let device = device.context("null device")?;
-        let context = context.context("null context")?;
-        {
-            let dxgi: windows::Win32::Graphics::Dxgi::IDXGIDevice =
-                device.cast().context("device -> IDXGIDevice")?;
-            let desc = dxgi.GetAdapter().context("GetAdapter")?.GetDesc()?;
-            let name = String::from_utf16_lossy(
-                &desc.Description[..desc
-                    .Description
-                    .iter()
-                    .position(|&c| c == 0)
-                    .unwrap_or(desc.Description.len())],
-            );
-            println!(
-                "adapter: {name} (vendor {:#06x}, luid {:08x}:{:08x})",
-                desc.VendorId, desc.AdapterLuid.HighPart, desc.AdapterLuid.LowPart
-            );
-        }
-
-        // Source FP16 texture (initialized) + SRV.
-        let src_desc = D3D11_TEXTURE2D_DESC {
-            Width: W,
-            Height: H,
-            MipLevels: 1,
-            ArraySize: 1,
-            Format: DXGI_FORMAT_R16G16B16A16_FLOAT,
-            SampleDesc: DXGI_SAMPLE_DESC {
-                Count: 1,
-                Quality: 0,
-            },
-            Usage: D3D11_USAGE_DEFAULT,
-            BindFlags: D3D11_BIND_SHADER_RESOURCE.0 as u32,
-            ..Default::default()
-        };
-        let init = D3D11_SUBRESOURCE_DATA {
-            pSysMem: fp16.as_ptr() as *const c_void,
-            SysMemPitch: W * 8, // 4 channels * 2 bytes
-            SysMemSlicePitch: 0,
-        };
-        let mut src_tex: Option<ID3D11Texture2D> = None;
-        device
-            .CreateTexture2D(&src_desc, Some(&init), Some(&mut src_tex))
-            .context("CreateTexture2D(fp16 src)")?;
-        let src_tex = src_tex.context("null src tex")?;
-        let mut src_srv: Option<ID3D11ShaderResourceView> = None;
-        device
-            .CreateShaderResourceView(&src_tex, None, Some(&mut src_srv))
-            .context("CreateShaderResourceView(fp16 src)")?;
-        let src_srv = src_srv.context("null src srv")?;
-
-        // P010 destination texture (render-target bindable).
-        let p010_desc = D3D11_TEXTURE2D_DESC {
-            Width: W,
-            Height: H,
-            MipLevels: 1,
-            ArraySize: 1,
-            Format: DXGI_FORMAT_P010,
-            SampleDesc: DXGI_SAMPLE_DESC {
-                Count: 1,
-                Quality: 0,
-            },
-            Usage: D3D11_USAGE_DEFAULT,
-            BindFlags: D3D11_BIND_RENDER_TARGET.0 as u32,
-            ..Default::default()
-        };
-        let mut p010: Option<ID3D11Texture2D> = None;
-        device
-            .CreateTexture2D(&p010_desc, None, Some(&mut p010))
-            .context("CreateTexture2D(P010 dst)")?;
-        let p010 = p010.context("null p010 tex")?;
-
-        let conv = HdrP010Converter::new(&device, W, H)?;
-        let y_rtv = HdrP010Converter::plane_rtv(&device, &p010, DXGI_FORMAT_R16_UNORM)?;
-        let uv_rtv = HdrP010Converter::plane_rtv(&device, &p010, DXGI_FORMAT_R16G16_UNORM)?;
-        conv.convert(&context, &src_srv, &y_rtv, &uv_rtv, W, H)?;
-
-        // Staging copy of the whole P010 texture (both planes), MAP_READ.
-        let stage_desc = D3D11_TEXTURE2D_DESC {
-            Width: W,
-            Height: H,
-            MipLevels: 1,
-            ArraySize: 1,
-            Format: DXGI_FORMAT_P010,
-            SampleDesc: DXGI_SAMPLE_DESC {
-                Count: 1,
-                Quality: 0,
-            },
-            Usage: D3D11_USAGE_STAGING,
-            BindFlags: 0,
-            CPUAccessFlags: D3D11_CPU_ACCESS_READ.0 as u32,
-            ..Default::default()
-        };
-        let mut staging: Option<ID3D11Texture2D> = None;
-        device
-            .CreateTexture2D(&stage_desc, None, Some(&mut staging))
-            .context("CreateTexture2D(P010 staging)")?;
-        let staging = staging.context("null staging")?;
-        context.CopyResource(&staging, &p010);
-
-        let mut map = D3D11_MAPPED_SUBRESOURCE::default();
-        context
-            .Map(&staging, 0, D3D11_MAP_READ, 0, Some(&mut map))
-            .context("Map(P010 staging)")?;
-        let row_pitch = map.RowPitch as usize; // bytes per luma row (in 16-bit samples: /2)
-        let base = map.pData as *const u8;
-        // DIAGNOSTIC (the uncertain layout spot — verify on the box if chroma is wrong): the mapped
-        // P010 plane offsets. Plane 0 (luma): H rows of W u16. Plane 1 (chroma): H/2 rows of W/2
-        // *interleaved* (Cb,Cr) u16 pairs. P010 packs plane 1 after plane 0 at the SAME row pitch; the
-        // chroma plane begins at byte offset RowPitch * (luma height). For a STAGING texture that
-        // height is the created H (no inter-plane alignment). DepthPitch (total mapped size) lets us
-        // sanity-check: it should be ~ RowPitch * H * 3/2. If chroma reads garbage on the box, print
-        // these and adjust `chroma_base` (e.g. an aligned luma height).
-        tracing::info!(
-            row_pitch,
-            depth_pitch = map.DepthPitch,
-            expected_chroma_base = row_pitch * H as usize,
-            expected_total = row_pitch * H as usize * 3 / 2,
-            "hdr-p010-selftest: mapped P010 layout (verify chroma plane offset here if chroma is wrong)"
-        );
-        // Plane 0 (luma): H rows of W u16. Plane 1 (chroma): H/2 rows of W/2 *interleaved* (Cb,Cr)
-        // u16 pairs, i.e. W u16 per chroma row. P010 packs plane 1 immediately after plane 0 at the
-        // SAME row pitch; per spec the chroma plane begins at an allocation offset of
-        // RowPitch * Height (luma rows). We read it from there. (DepthPitch is the full surface size;
-        // not all drivers report the chroma offset, so RowPitch*Height is the portable choice.)
-        let read_u16 = |byte_off: usize| -> u16 {
-            // SAFETY: `base` is the mapped staging pointer; all offsets are within the P010 surface
-            // (luma H*RowPitch + chroma (H/2)*RowPitch ≤ DepthPitch). Already in the fn's unsafe scope.
-            let p = base.add(byte_off) as *const u16;
-            p.read_unaligned()
-        };
-        // Luma codes: stored u16 in the high 10 bits -> code10 = stored >> 6.
-        let mut y_codes = vec![0u16; (W * H) as usize];
-        for y in 0..H {
-            for x in 0..W {
-                let off = (y as usize) * row_pitch + (x as usize) * 2;
-                y_codes[(y * W + x) as usize] = read_u16(off) >> 6;
-            }
-        }
-        let cw = W / 2;
-        let ch = H / 2;
-        let chroma_base = row_pitch * H as usize; // plane 1 offset
-        let mut cb_codes = vec![0u16; (cw * ch) as usize];
-        let mut cr_codes = vec![0u16; (cw * ch) as usize];
-        for cy in 0..ch {
-            for cx in 0..cw {
-                // Interleaved (Cb, Cr) per chroma sample → 2 u16 = 4 bytes per sample.
-                let off = chroma_base + (cy as usize) * row_pitch + (cx as usize) * 4;
-                cb_codes[(cy * cw + cx) as usize] = read_u16(off) >> 6;
-                cr_codes[(cy * cw + cx) as usize] = read_u16(off + 2) >> 6;
-            }
-        }
-        context.Unmap(&staging, 0);
-
-        // Compare Y over every pixel.
-        let mut max_y_err = 0.0f64;
-        for y in 0..H {
-            for x in 0..W {
-                let (r, g, b, _) = pixel_rgb(x, y);
-                let (ry, _, _) = p010_reference(r as f64, g as f64, b as f64);
-                let got = y_codes[(y * W + x) as usize] as f64;
-                max_y_err = max_y_err.max((got - ry).abs());
-            }
-        }
-        // Compare Cb/Cr over flat blocks only (uniform 2x2 footprint → exact reference).
-        let mut max_u_err = 0.0f64;
-        let mut max_v_err = 0.0f64;
-        for cy in 0..ch {
-            for cx in 0..cw {
-                let (sx, sy) = (cx * 2, cy * 2);
-                let all_flat =
-                    (0..2).all(|dy| (0..2).all(|dx| flat[((sy + dy) * W + (sx + dx)) as usize]));
-                if !all_flat {
-                    continue;
-                }
-                let (r, g, b, _) = pixel_rgb(sx, sy);
-                let (_, rcb, rcr) = p010_reference(r as f64, g as f64, b as f64);
-                let gu = cb_codes[(cy * cw + cx) as usize] as f64;
-                let gv = cr_codes[(cy * cw + cx) as usize] as f64;
-                max_u_err = max_u_err.max((gu - rcb).abs());
-                max_v_err = max_v_err.max((gv - rcr).abs());
-            }
-        }
-
-        // Per-colour table.
-        println!("HDR P010 self-test ({W}x{H}, BT.2020 PQ, 10-bit limited range)");
-        println!(
-            "  {:<10} {:>14} {:>14} {:>14}",
-            "color", "Y exp/got", "Cb exp/got", "Cr exp/got"
-        );
-        for (idx, (name, r, g, b)) in named.iter().enumerate() {
-            let bx = (idx as u32 % grid_cols) * BLK + BLK / 2;
-            let by = (idx as u32 / grid_cols) * BLK + BLK / 2;
-            let (ey, ecb, ecr) = p010_reference(*r as f64, *g as f64, *b as f64);
-            let gy = y_codes[(by * W + bx) as usize] as f64;
-            let (ccx, ccy) = (bx / 2, by / 2);
-            let gu = cb_codes[(ccy * cw + ccx) as usize] as f64;
-            let gv = cr_codes[(ccy * cw + ccx) as usize] as f64;
-            println!(
-                "  {:<10} {:>6.1}/{:<6.0} {:>6.1}/{:<6.0} {:>6.1}/{:<6.0}",
-                name, ey, gy, ecb, gu, ecr, gv
-            );
-        }
-        println!(
-            "  max abs error:  Y={max_y_err:.2} (≤4)   Cb={max_u_err:.2} (≤5)   Cr={max_v_err:.2} (≤5)"
-        );
-
-        if max_y_err <= 4.0 && max_u_err <= 5.0 && max_v_err <= 5.0 {
-            println!("PASS");
-            Ok(())
-        } else {
-            println!("FAIL");
-            bail!(
-                "HDR P010 self-test FAILED (Y={max_y_err:.2} Cb={max_u_err:.2} Cr={max_v_err:.2})"
-            );
-        }
-    }
-}
-
-/// Minimal f32 → IEEE-754 half (f16) bit pattern, for uploading the FP16 scRGB self-test pattern. Not
-/// on any hot path; handles normals, subnormals, and the 1.0/0.0 constants we feed. (round-to-nearest)
-#[cfg(target_os = "windows")]
-fn f32_to_f16(v: f32) -> u16 {
-    let bits = v.to_bits();
-    let sign = ((bits >> 16) & 0x8000) as u16;
-    let exp = ((bits >> 23) & 0xff) as i32 - 127 + 15;
-    let mant = bits & 0x007f_ffff;
-    if exp <= 0 {
-        // Subnormal / zero in half precision.
-        if exp < -10 {
-            return sign; // too small → ±0
-        }
-        let mant = mant | 0x0080_0000; // implicit 1
-        let shift = (14 - exp) as u32;
-        let half_mant = (mant >> shift) as u16;
-        // Round to nearest.
-        let round = ((mant >> (shift - 1)) & 1) as u16;
-        sign | (half_mant + round)
-    } else if exp >= 0x1f {
-        sign | 0x7c00 // Inf/NaN → Inf (our inputs never hit this)
-    } else {
-        let half_exp = (exp as u16) << 10;
-        let half_mant = (mant >> 13) as u16;
-        let round = ((mant >> 12) & 1) as u16;
-        // ADD, never OR. `half_mant + round` can carry out of the 10-bit mantissa (all ones, then
-        // rounded up), and that carry must INCREMENT the exponent — which is exactly what an
-        // IEEE-754 round-to-nearest overflow means. `sign | half_exp | (…)` instead ORed it into bit
-        // 10, so for every ODD biased exponent (bit 10 already set) the carry vanished and the
-        // result came back a factor of ~2 low: `f32_to_f16(1.9998779) → 0x3C00 = 1.0`,
-        // `0.49996948 → 0.25`. Only values one ULP below a power of two are affected — which is
-        // precisely what a gradient test pattern is full of, so this made `hdr-p010-selftest` FAIL a
-        // correct shader. The subnormal branch above was already additive.
-        sign | (half_exp + half_mant + round)
-    }
-}
-
-#[cfg(test)]
-mod f16_tests {
-    use super::f32_to_f16;
-
-    /// Round-trip through the reference conversion the rest of the test uses as an oracle.
-    fn f16_to_f32(h: u16) -> f32 {
-        let sign = if h & 0x8000 != 0 { -1.0f32 } else { 1.0 };
-        let exp = ((h >> 10) & 0x1f) as i32;
-        let mant = (h & 0x3ff) as f32;
-        match exp {
-            0 => sign * mant * 2f32.powi(-24), // subnormal
-            31 => sign * f32::INFINITY,        // our encoder never emits NaN
-            e => sign * (1.0 + mant / 1024.0) * 2f32.powi(e - 15),
-        }
-    }
-
-    /// W7: the rounding carry out of the mantissa must INCREMENT the exponent. The composition used
-    /// `sign | half_exp | (half_mant + round)`, which swallowed that carry for every odd biased
-    /// exponent — a silent factor-of-2 error on exactly the values a gradient test pattern is full
-    /// of, which made `hdr-p010-selftest` fail a correct shader.
-    #[test]
-    fn a_rounding_carry_increments_the_exponent() {
-        // The plan's canonical case: biased exponent 127 (2^0) with a mantissa that rounds up out
-        // of 10 bits ⇒ 2.0 = 0x4000, NOT 1.0 = 0x3C00.
-        assert_eq!(f32_to_f16(f32::from_bits((127 << 23) | 0x7FF000)), 0x4000);
-        // The two measured regressions, by value.
-        assert_eq!(
-            f32_to_f16(1.9998779),
-            0x4000,
-            "1.9998779 must not read as 1.0"
-        );
-        assert_eq!(
-            f32_to_f16(0.49996948),
-            0x3800,
-            "0.49996948 must not read as 0.25"
-        );
-        // …and an EVEN biased exponent, where the bug happened to be invisible (bit 10 clear), so
-        // the fix must not change it.
-        assert_eq!(f32_to_f16(f32::from_bits((128 << 23) | 0x7FF000)), 0x4400); // → 4.0
-    }
-
-    #[test]
-    fn the_constants_the_selftest_uploads_are_exact() {
-        assert_eq!(f32_to_f16(0.0), 0x0000);
-        assert_eq!(f32_to_f16(-0.0), 0x8000);
-        assert_eq!(f32_to_f16(1.0), 0x3C00);
-        assert_eq!(f32_to_f16(-1.0), 0xBC00);
-        assert_eq!(f32_to_f16(0.5), 0x3800);
-        assert_eq!(f32_to_f16(2.0), 0x4000);
-        assert_eq!(f32_to_f16(4.0), 0x4400);
-    }
-
-    /// Every HDR scRGB value the self-test patterns use must survive the round trip to within one
-    /// f16 ULP — the property the P010 comparison actually depends on.
-    #[test]
-    fn hdr_scrgb_values_round_trip_within_one_ulp() {
-        for &v in &[
-            0.0f32, 0.25, 0.5, 1.0, 1.5, 2.0, 3.0, 4.0, 0.1, 0.3, 0.7, 1.9998779, 0.49996948, 2.5,
-            3.999, 0.001,
-        ] {
-            let back = f16_to_f32(f32_to_f16(v));
-            // One ULP at this magnitude: f16 carries 11 significand bits.
-            let ulp = (v.abs() / 1024.0).max(2f32.powi(-24));
-            assert!(
-                (back - v).abs() <= ulp,
-                "{v} round-tripped to {back} (ulp {ulp})"
-            );
-        }
-    }
-
-    #[test]
-    fn out_of_range_magnitudes_saturate_rather_than_wrap() {
-        // Above f16's max finite (65504) our encoder reports Inf; below its subnormal floor, ±0.
-        assert_eq!(f32_to_f16(1.0e30), 0x7C00);
-        assert_eq!(f32_to_f16(-1.0e30), 0xFC00);
-        assert_eq!(f32_to_f16(1.0e-30), 0x0000);
-        assert_eq!(f32_to_f16(-1.0e-30), 0x8000);
-    }
-}
-
-#[cfg(test)]
-mod hdr_selftests {
-    /// LIVE (needs the GPU): [`super::hdr_p010_selftest_at`] at the field capture size — 1080 is
-    /// NOT 16-aligned, and the planar-RTV write path is driver-specific per vendor. Pinned to the
-    /// Intel adapter (`0x8086`), so it runs on the Intel validation boxes and errors out cleanly
-    /// ("no adapter") elsewhere. `cargo test -p pf-capture -- --ignored hdr_p010 --nocapture`.
-    #[test]
-    #[ignore]
-    fn hdr_p010_selftest_intel_1080_live() {
-        super::hdr_p010_selftest_at(1920, 1080, Some(0x8086)).expect("hdr p010 selftest @1080");
-    }
-}
@@ -105,22 +105,6 @@ impl ChannelBroker {
        Ok(out.0 as usize as u64)
    }

-    /// Duplicate the cursor section into WUDFHost (v5 cursor channel) with the same
-    /// least-privilege section rights as the frame header. Thin `pub(super)` face over
-    /// [`dup_into`](Self::dup_into) for the cursor-delivery path in `open_on`.
-    ///
-    /// # Safety
-    /// `h` must be a live handle of the current process.
-    pub(super) unsafe fn dup_into_public(&self, h: HANDLE) -> Result<u64> {
-        // SAFETY: forwarded contract — `h` is live per this fn's own contract.
-        unsafe { self.dup_into(h, Some(SECTION_MAP_RW)) }
-    }
-
-    /// [`close_remote`](Self::close_remote) for the cursor-delivery failure path.
-    pub(super) fn close_remote_public(&self, value: u64) {
-        self.close_remote(value);
-    }
-
    /// Close a handle VALUE inside the WUDFHost table (the failure-path reaper): `DUPLICATE_CLOSE_SOURCE`
    /// with no target closes the source handle regardless of the (ignored) result.
    fn close_remote(&self, value: u64) {
@@ -1,130 +0,0 @@
-//! The LAST-RESORT DWM compose kick — synthetic pointer input that dirties a specific virtual
-//! display so DWM presents it.
-//!
-//! Split out of `idd_push.rs` in sweep Phase 5.4. It is self-contained (one function plus a
-//! process-global throttle) and it is the one piece of the capture path that reaches for synthetic
-//! INPUT, which is worth keeping visibly separate from the frame machinery: it is unreliable by
-//! nature, user-visible in the sibling-display case, and only ever a fallback for the driver's own
-//! `FrameStash` republish.
-
-use super::*;
-
-/// LAST-RESORT fallback: nudge DWM into composing THE TARGET virtual display. DWM presents a
-/// display only when something DIRTIES it — an idle desktop never does, so a freshly-attached ring
-/// (session open, or a mid-session ring recreate) can sit at E_PENDING with no first frame even
-/// though everything is healthy.
-///
-/// The PRIMARY first-frame mechanism is the driver's `FrameStash` (frame_transport.rs): the driver
-/// retains the last composed frame and republishes it into every freshly-attached ring, so with a
-/// stash-capable driver the first frame lands milliseconds after the channel delivery and this kick
-/// never fires. It remains for pre-stash drivers and for the empty-stash cold start (a monitor that
-/// has NEVER composed — normally the activation compose covers that). Synthetic input is inherently
-/// unreliable — blocked on the secure desktop, defeated by a fullscreen game's ClipCursor, and
-/// user-visible in the sibling-display case — which is exactly why it was demoted to fallback.
-///
-/// pf-vdisplay implements no hardware-cursor plane, so a cursor move is composited into
-/// the frame — a guaranteed real present onto the IDD swap-chain (empirically what
-/// `punktfunk-probe --input-test` always relied on).
-///
-/// The cursor only dirties the display it is ON — proven on-glass in the Stage-W3 two-display
-/// validation: display B's session-open kicks wiggled the cursor on display A and B never composed
-/// a first frame. So the kick is per-TARGET: when the cursor already sits inside `target_id`'s
-/// desktop region (always true single-display), two net-zero 1 px relative moves (the historical
-/// behavior, pointer ends exactly where it started); when it sits on a SIBLING display, jump the
-/// cursor to the target's center and straight back (`SetCursorPos` ×2 — each absolute move dirties
-/// the cursor layer of the display it lands on, so the target composes at least one frame).
-/// Best-effort — injection can be unavailable on the secure desktop, where a fresh compose just
-/// happened anyway.
-///
-/// **COST:** the sibling-display branch SLEEPS 35 ms on the calling thread between the two
-/// `SetCursorPos`es. The dwell is load-bearing (see the comment at that branch: a sub-tick
-/// jump-and-return never dirties anything), but the caller is the capture/encode thread, so a kick
-/// on that branch costs ~2 frames of latency at 60 Hz. Every call site is a first-frame or
-/// post-recreate recovery window where no frames are flowing anyway, and the global 50 ms throttle
-/// plus the callers' own 600–800 ms schedules bound how often it can happen.
-///
-/// **HID-first**: when the host has registered [`HID_COMPOSE_KICK`] (the resident pf-mouse virtual
-/// HID pointer), the kick goes through it INSTEAD of the `SendInput` paths below. A report from a
-/// HID device is real input to win32k — delivered regardless of this process's session or the
-/// active desktop, it wakes a powered-off display subsystem (lid-closed laptop / display idle-off /
-/// modern standby) and counts as user presence — every condition under which `SendInput` is
-/// silently impotent (wrong session → wrong input queue; secure desktop → blocked; display off →
-/// nothing composes at all). That set is exactly the lid-closed field-report state.
-pub(super) fn kick_dwm_compose(target_id: u32) {
-    // Process-GLOBAL throttle (Stage W3): with N parallel capturers each nudging on its own
-    // schedule, DWM needs only one dirty per composition window — and the nudge is synthetic INPUT
-    // (global, user-visible pointer state), so it must not multiply with capturer count. 50 ms
-    // covers every composition interval we ship (≥ 60 Hz) while staying far under the callers' own
-    // 600–800 ms per-capturer schedules.
-    static LAST_KICK: Mutex<Option<Instant>> = Mutex::new(None);
-    {
-        let mut last = LAST_KICK.lock().unwrap();
-        let now = Instant::now();
-        if last.is_some_and(|t| now.duration_since(t) < Duration::from_millis(50)) {
-            return;
-        }
-        *last = Some(now);
-    }
-    // Where is the cursor, and where does the target display live in desktop space?
-    let mut pos = POINT::default();
-    // SAFETY: plain FFI; `pos` is a valid out-param for this synchronous call.
-    let have_pos = unsafe { GetCursorPos(&mut pos) }.is_ok();
-    // SAFETY: `source_desktop_rect` only runs the CCD QueryDisplayConfig FFI over owned local
-    // buffers; the `Copy` target id crosses by value.
-    let rect = unsafe { pf_win_display::win_display::source_desktop_rect(target_id) };
-    // HID-first (see the doc comment): the registered virtual-mouse kick works from any
-    // session/desktop and wakes an off display. Both geometries come from CCD (global database),
-    // NOT per-session GDI metrics, so the aim is right even from a non-console session. Fall
-    // through to SendInput only when the hook isn't registered / the mouse isn't up.
-    if let (Some(kick), Some(rect)) = (crate::HID_COMPOSE_KICK.get(), rect) {
-        // SAFETY: `desktop_bounds` only runs the CCD QueryDisplayConfig FFI over owned local
-        // buffers.
-        let bounds = unsafe { pf_win_display::win_display::desktop_bounds() };
-        if let Some(bounds) = bounds {
-            if kick(rect, bounds) {
-                return;
-            }
-        }
-    }
-    if let (true, Some((x, y, w, h))) = (have_pos, rect) {
-        let inside = pos.x >= x && pos.x < x + w.max(1) && pos.y >= y && pos.y < y + h.max(1);
-        if !inside {
-            // The cursor is on a sibling display — a wiggle there dirties the WRONG display. Jump
-            // to the target's center, DWELL one composition interval, then restore. The dwell is
-            // load-bearing (proven on-glass, Stage W3): DWM computes dirty state from the CURRENT
-            // cursor position at the next vsync tick, so a sub-tick jump-and-return is invisible
-            // and the target never composes — 35 ms covers a 30 Hz tick with margin. The cursor
-            // visibly leaves the sibling display for those ~2 frames; kicks only fire during THIS
-            // display's session-open / recovery windows (throttled), so the blip is rare and brief.
-            // SAFETY: plain FFI; coordinates are plain ints, and the second call restores the
-            // observed original position.
-            unsafe {
-                let _ = SetCursorPos(x + w / 2, y + h / 2);
-            }
-            std::thread::sleep(Duration::from_millis(35));
-            // SAFETY: as above.
-            unsafe {
-                let _ = SetCursorPos(pos.x, pos.y);
-            }
-            return;
-        }
-    }
-    let mk = |dx: i32| INPUT {
-        r#type: INPUT_MOUSE,
-        Anonymous: INPUT_0 {
-            mi: MOUSEINPUT {
-                dx,
-                dy: 0,
-                mouseData: 0,
-                dwFlags: MOUSEEVENTF_MOVE,
-                time: 0,
-                dwExtraInfo: 0,
-            },
-        },
-    };
-    // SAFETY: plain FFI; the input slice is valid, fully-initialized local data for this synchronous
-    // call, and `cbsize` is the true element size.
-    unsafe {
-        let _ = SendInput(&[mk(1), mk(-1)], std::mem::size_of::<INPUT>() as i32);
-    }
-}
@@ -1,194 +0,0 @@
-//! Host side of the v5 hardware-cursor channel (remote-desktop-sweep M2c): the capturer creates
-//! an unnamed [`CursorShm`] section, delivers it to the pf-vdisplay driver (which declares an
-//! IddCx hardware cursor — DWM then EXCLUDES the pointer from the frames we consume), and reads
-//! the driver's seqlock publishes here at encode-tick pace, converting them into the same
-//! [`pf_frame::CursorOverlay`] the Linux portal path produces — everything downstream (the
-//! cursor forwarder, the wire, the client renderer) is shared.
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it.
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use super::*;
-use pf_driver_proto::cursor::{
-    CursorShm, CURSOR_MAGIC, CURSOR_SHAPE_BYTES, CURSOR_SHAPE_MAX, CURSOR_SHAPE_OFFSET,
-    CURSOR_SHM_SIZE, CURSOR_TYPE_MASKED_COLOR,
-};
-use std::sync::atomic::AtomicU32;
-
-/// The host end of one monitor's cursor channel: the section (we created it — the mapping stays
-/// valid for the capturer's life) plus the reader's conversion cache.
-pub(super) struct CursorShared {
-    section: MappedSection,
-    /// The monitor's desktop origin — IddCx reports positions in DESKTOP coordinates; the
-    /// overlay wants frame-relative. Fetched at attach (the virtual monitor's placement is
-    /// stable for the session; a topology change recreates the pipeline anyway).
-    origin: (i32, i32),
-    /// Conversion cache: the last `shape_id` whose pixels were converted, and the result.
-    /// Position-only updates (the common case) reuse it — a refcount bump, no pixel work.
-    cached_id: u32,
-    cached: Option<ConvertedShape>,
-}
-
-struct ConvertedShape {
-    rgba: std::sync::Arc<Vec<u8>>,
-    w: u32,
-    h: u32,
-    hot_x: u32,
-    hot_y: u32,
-}
-
-impl CursorShared {
-    /// Create + initialize the section (magic stamped, seq even/zero). The returned handle is
-    /// the section itself (owned by `self`); the caller duplicates it into the WUDFHost.
-    pub(super) fn create(target_id: u32) -> Result<CursorShared> {
-        // SAFETY: plain FFI. Unnamed pagefile-backed section, host-lifetime owned; the view is
-        // mapped once and unmapped never (the capturer's life = the session's life).
-        let section = unsafe {
-            let map = CreateFileMappingW(
-                INVALID_HANDLE_VALUE,
-                None,
-                PAGE_READWRITE,
-                0,
-                CURSOR_SHM_SIZE as u32,
-                PCWSTR::null(),
-            )
-            .context("CreateFileMapping(cursor)")?;
-            let map = OwnedHandle::from_raw_handle(map.0 as _);
-            let view = MapViewOfFile(
-                HANDLE(map.as_raw_handle()),
-                FILE_MAP_ALL_ACCESS,
-                0,
-                0,
-                CURSOR_SHM_SIZE,
-            );
-            if view.Value.is_null() {
-                bail!("MapViewOfFile failed for the cursor section");
-            }
-            let shm = view.Value.cast::<CursorShm>();
-            std::ptr::write_bytes(view.Value.cast::<u8>(), 0, CURSOR_SHM_SIZE);
-            // Magic LAST-ish (the driver validates it at adopt; seq 0 = even = consistent).
-            std::sync::atomic::fence(Ordering::Release);
-            (*shm).magic = CURSOR_MAGIC;
-            MappedSection { handle: map, view }
-        };
-        // Desktop origin of this monitor's source — for the desktop→frame coordinate shift.
-        // SAFETY: `source_desktop_rect` only runs the CCD QueryDisplayConfig FFI over owned
-        // locals (same call the compose-kick path makes).
-        let rect = unsafe { pf_win_display::win_display::source_desktop_rect(target_id) };
-        let origin = rect.map(|(x, y, _w, _h)| (x, y)).unwrap_or((0, 0));
-        Ok(CursorShared {
-            section,
-            origin,
-            cached_id: 0,
-            cached: None,
-        })
-    }
-
-    /// The section handle for the broker's duplication into the WUDFHost.
-    pub(super) fn section_handle(&self) -> HANDLE {
-        HANDLE(self.section.handle.as_raw_handle())
-    }
-
-    /// Seqlock-read the driver's latest publish → a frame-relative [`pf_frame::CursorOverlay`].
-    /// `None` until the first publish lands (or while the pointer has never been seen). A hidden
-    /// pointer returns `Some` with `visible: false` — the forwarder turns that into the client's
-    /// relative-mode hint, exactly like the Linux path.
-    pub(super) fn read(&mut self) -> Option<pf_frame::CursorOverlay> {
-        let shm = self.section.ptr::<CursorShm>();
-        // SAFETY: the view spans CURSOR_SHM_SIZE for self's lifetime; seq is 4-aligned in the
-        // fixed layout (offset 4).
-        let seq = unsafe { &*std::ptr::addr_of!((*shm).seq).cast::<AtomicU32>() };
-        for _ in 0..64 {
-            let s1 = seq.load(Ordering::Acquire);
-            if s1 == 0 {
-                return None; // no publish yet
-            }
-            if s1 & 1 != 0 {
-                std::hint::spin_loop();
-                continue; // writer mid-update
-            }
-            // SAFETY: header reads within the mapped view; consistency is validated by the
-            // seq re-check below (a torn read is discarded and retried).
-            let hdr = unsafe { std::ptr::read_volatile(shm) };
-            // Shape pixels: convert only when the OS minted a new shape id.
-            if hdr.visible != 0 && hdr.shape_id != self.cached_id {
-                let rows = hdr.height.min(CURSOR_SHAPE_MAX) as usize;
-                let width = hdr.width.min(CURSOR_SHAPE_MAX) as usize;
-                let pitch = (hdr.pitch as usize).min(CURSOR_SHAPE_BYTES / rows.max(1));
-                let mut raw = vec![0u8; rows * pitch];
-                // SAFETY: the shape region spans CURSOR_SHAPE_BYTES from CURSOR_SHAPE_OFFSET
-                // inside the mapped view; `rows * pitch` is clamped to it above.
-                unsafe {
-                    std::ptr::copy_nonoverlapping(
-                        self.section.ptr::<u8>().add(CURSOR_SHAPE_OFFSET),
-                        raw.as_mut_ptr(),
-                        rows * pitch,
-                    );
-                }
-                // Discard the copy if the writer raced us mid-shape (seq moved) — retry.
-                if seq.load(Ordering::Acquire) != s1 {
-                    continue;
-                }
-                self.cached = Some(convert_shape(&hdr, &raw, width, rows, pitch));
-                self.cached_id = hdr.shape_id;
-            } else if seq.load(Ordering::Acquire) != s1 {
-                continue;
-            }
-            let shape = self.cached.as_ref()?;
-            return Some(pf_frame::CursorOverlay {
-                x: hdr.x - self.origin.0,
-                y: hdr.y - self.origin.1,
-                w: shape.w,
-                h: shape.h,
-                rgba: shape.rgba.clone(),
-                serial: u64::from(hdr.shape_id),
-                hot_x: shape.hot_x,
-                hot_y: shape.hot_y,
-                visible: hdr.visible != 0,
-            });
-        }
-        None // persistent tearing (writer wedged mid-seq) — skip this tick
-    }
-}
-
-/// Convert the OS's 32-bpp pitch-strided shape rows into the overlay's packed straight RGBA.
-/// ALPHA cursors are BGRA with straight per-pixel alpha (swap R↔B). MASKED_COLOR approximates:
-/// alpha 0x00 = opaque color pixel; 0xFF = an XOR pixel we cannot honor client-side — rendered
-/// as a translucent mid-gray so inversion cursors stay visible instead of vanishing.
-fn convert_shape(
-    hdr: &CursorShm,
-    raw: &[u8],
-    width: usize,
-    rows: usize,
-    pitch: usize,
-) -> ConvertedShape {
-    let masked = hdr.cursor_type == CURSOR_TYPE_MASKED_COLOR;
-    let mut rgba = Vec::with_capacity(width * rows * 4);
-    for y in 0..rows {
-        let row = &raw[y * pitch..];
-        for x in 0..width {
-            let o = x * 4;
-            if o + 4 > row.len() {
-                rgba.extend_from_slice(&[0, 0, 0, 0]);
-                continue;
-            }
-            let (b, g, r, a) = (row[o], row[o + 1], row[o + 2], row[o + 3]);
-            if masked {
-                if a == 0 {
-                    rgba.extend_from_slice(&[r, g, b, 0xFF]);
-                } else {
-                    rgba.extend_from_slice(&[0x80, 0x80, 0x80, 0xB4]);
-                }
-            } else {
-                rgba.extend_from_slice(&[r, g, b, a]);
-            }
-        }
-    }
-    ConvertedShape {
-        rgba: std::sync::Arc::new(rgba),
-        w: width as u32,
-        h: rows as u32,
-        hot_x: hdr.hot_x.min(width.saturating_sub(1) as u32),
-        hot_y: hdr.hot_y.min(rows.saturating_sub(1) as u32),
-    }
-}
@@ -1,240 +0,0 @@
-//! Host-side cursor compositing for the CAPTURE mouse model (design/remote-desktop-sweep.md §8).
-//!
-//! Why the host draws it: once a monitor has ever declared an IddCx hardware cursor, DWM will
-//! not composite the software cursor back into its frames — there is no un-declare DDI (the
-//! empty-caps re-setup is rejected `STATUS_INVALID_PARAMETER`), and a successful same-mode
-//! re-commit with the driver's re-declare provably suppressed still leaves the pointer excluded
-//! (all observed on-glass, 26100). So the driver keeps its hardware cursor declared for the
-//! session's whole life — the state that works — and when the client flips to the capture model
-//! the HOST composites the pointer into the frame itself: a slot→scratch copy plus one
-//! alpha-blended quad (the GDI poller's full-fidelity shape at its polled position), entirely
-//! GPU-side on the capture device, before the normal conversion runs from the scratch.
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use super::*;
-use windows::core::s;
-use windows::Win32::Graphics::Direct3D::D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST;
-use windows::Win32::Graphics::Direct3D11::{
-    ID3D11BlendState, ID3D11Buffer, ID3D11PixelShader, ID3D11SamplerState, ID3D11VertexShader,
-    D3D11_BIND_CONSTANT_BUFFER, D3D11_BLEND_DESC, D3D11_BLEND_INV_SRC_ALPHA, D3D11_BLEND_ONE,
-    D3D11_BLEND_OP_ADD, D3D11_BLEND_SRC_ALPHA, D3D11_BUFFER_DESC, D3D11_COMPARISON_NEVER,
-    D3D11_CPU_ACCESS_WRITE, D3D11_FILTER_MIN_MAG_MIP_LINEAR, D3D11_MAPPED_SUBRESOURCE,
-    D3D11_MAP_WRITE_DISCARD, D3D11_RENDER_TARGET_BLEND_DESC, D3D11_SAMPLER_DESC,
-    D3D11_SUBRESOURCE_DATA, D3D11_TEXTURE_ADDRESS_CLAMP, D3D11_USAGE_DYNAMIC, D3D11_VIEWPORT,
-};
-use windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT_R8G8B8A8_UNORM;
-
-/// Straight-alpha sample of the cursor bitmap. `linear_scale` = 0 passes sRGB through (SDR
-/// ring); non-zero linearizes sRGB→scRGB AND multiplies by the target's SDR-white scale
-/// (`sdr_white_level_scale` — 1.0 would put cursor-white at 80 nits, visibly DARKER than the
-/// surrounding SDR desktop content DWM composes at the user's SDR-brightness setting).
-const CURSOR_PS: &str = r"
-Texture2D<float4> tx : register(t0);
-SamplerState sm : register(s0);
-cbuffer C : register(b0) { float linear_scale; float3 pad; };
-float4 main(float4 pos : SV_POSITION, float2 uv : TEXCOORD0) : SV_Target {
-    float4 c = tx.Sample(sm, uv);
-    if (linear_scale != 0.0) {
-        c.rgb = pow(abs(c.rgb), 2.2) * linear_scale;
-    }
-    return c;
-}
-";
-
-/// The cursor-quad blend pass + its shape-texture cache. One per capturer (device-scoped).
-pub(super) struct CursorBlendPass {
-    vs: ID3D11VertexShader,
-    ps: ID3D11PixelShader,
-    sampler: ID3D11SamplerState,
-    blend: ID3D11BlendState,
-    cbuf: ID3D11Buffer,
-    cbuf_scale: Option<f32>,
-    /// The uploaded shape (serial-keyed): SRV + dims in host pixels.
-    shape: Option<(u64, ID3D11ShaderResourceView, u32, u32)>,
-}
-
-impl CursorBlendPass {
-    pub(super) unsafe fn new(device: &ID3D11Device) -> Result<Self> {
-        // SAFETY: `?`-checked D3D11 resource creation on the live `device` borrow, over
-        // fully-initialized stack descriptors and live out-params; `compile_shader` receives `s!()`
-        // literals (its contract).
-        unsafe {
-            let vsb = crate::dxgi::compile_shader(crate::dxgi::HDR_VS, s!("main"), s!("vs_5_0"))?;
-            let psb = crate::dxgi::compile_shader(CURSOR_PS, s!("main"), s!("ps_5_0"))?;
-            let mut vs = None;
-            device.CreateVertexShader(&vsb, None, Some(&mut vs))?;
-            let mut ps = None;
-            device.CreatePixelShader(&psb, None, Some(&mut ps))?;
-            let sd = D3D11_SAMPLER_DESC {
-                // LINEAR: the quad is drawn 1:1 in frame pixels, so this only matters at the
-                // half-texel edges; linear keeps them soft instead of ringing.
-                Filter: D3D11_FILTER_MIN_MAG_MIP_LINEAR,
-                AddressU: D3D11_TEXTURE_ADDRESS_CLAMP,
-                AddressV: D3D11_TEXTURE_ADDRESS_CLAMP,
-                AddressW: D3D11_TEXTURE_ADDRESS_CLAMP,
-                ComparisonFunc: D3D11_COMPARISON_NEVER,
-                MaxLOD: f32::MAX,
-                ..Default::default()
-            };
-            let mut sampler = None;
-            device.CreateSamplerState(&sd, Some(&mut sampler))?;
-            // Straight-alpha over: dst.rgb = src.rgb*a + dst.rgb*(1-a); keep dst alpha.
-            let mut bd = D3D11_BLEND_DESC::default();
-            bd.RenderTarget[0] = D3D11_RENDER_TARGET_BLEND_DESC {
-                BlendEnable: true.into(),
-                SrcBlend: D3D11_BLEND_SRC_ALPHA,
-                DestBlend: D3D11_BLEND_INV_SRC_ALPHA,
-                BlendOp: D3D11_BLEND_OP_ADD,
-                SrcBlendAlpha: D3D11_BLEND_ONE,
-                DestBlendAlpha: D3D11_BLEND_ONE,
-                BlendOpAlpha: D3D11_BLEND_OP_ADD,
-                RenderTargetWriteMask: 0x0F,
-            };
-            let mut blend = None;
-            device.CreateBlendState(&bd, Some(&mut blend))?;
-            let cbd = D3D11_BUFFER_DESC {
-                ByteWidth: 16, // float to_linear + float3 pad
-                Usage: D3D11_USAGE_DYNAMIC,
-                BindFlags: D3D11_BIND_CONSTANT_BUFFER.0 as u32,
-                CPUAccessFlags: D3D11_CPU_ACCESS_WRITE.0 as u32,
-                ..Default::default()
-            };
-            let mut cbuf = None;
-            device.CreateBuffer(&cbd, None, Some(&mut cbuf))?;
-            Ok(Self {
-                vs: vs.context("cursor blend vs")?,
-                ps: ps.context("cursor blend ps")?,
-                sampler: sampler.context("cursor blend sampler")?,
-                blend: blend.context("cursor blend state")?,
-                cbuf: cbuf.context("cursor blend cbuf")?,
-                cbuf_scale: None,
-                shape: None,
-            })
-        }
-    }
-
-    /// Upload `ov`'s bitmap if its serial is new; reuse the cached SRV otherwise.
-    unsafe fn ensure_shape(
-        &mut self,
-        device: &ID3D11Device,
-        ov: &pf_frame::CursorOverlay,
-    ) -> Result<()> {
-        // SAFETY: `CreateTexture2D`/`CreateShaderResourceView` are `?`-checked calls on the live
-        // `device` borrow. `init.pSysMem` points into `ov.rgba`, which the length check above proves
-        // holds at least `ov.w * ov.h * 4` bytes for the declared `SysMemPitch = ov.w * 4`, and which
-        // outlives the synchronous upload.
-        unsafe {
-            if self.shape.as_ref().is_some_and(|(s, ..)| *s == ov.serial) {
-                return Ok(());
-            }
-            if ov.rgba.len() < (ov.w as usize) * (ov.h as usize) * 4 || ov.w == 0 || ov.h == 0 {
-                bail!("malformed cursor overlay ({}x{})", ov.w, ov.h);
-            }
-            let desc = D3D11_TEXTURE2D_DESC {
-                Width: ov.w,
-                Height: ov.h,
-                MipLevels: 1,
-                ArraySize: 1,
-                Format: DXGI_FORMAT_R8G8B8A8_UNORM,
-                SampleDesc: DXGI_SAMPLE_DESC {
-                    Count: 1,
-                    Quality: 0,
-                },
-                Usage: D3D11_USAGE_DEFAULT,
-                BindFlags: D3D11_BIND_SHADER_RESOURCE.0 as u32,
-                ..Default::default()
-            };
-            let init = D3D11_SUBRESOURCE_DATA {
-                pSysMem: ov.rgba.as_ptr().cast(),
-                SysMemPitch: ov.w * 4,
-                SysMemSlicePitch: 0,
-            };
-            let mut tex: Option<ID3D11Texture2D> = None;
-            device
-                .CreateTexture2D(&desc, Some(&init), Some(&mut tex))
-                .context("CreateTexture2D(cursor shape)")?;
-            let tex = tex.context("null cursor shape texture")?;
-            let mut srv: Option<ID3D11ShaderResourceView> = None;
-            device
-                .CreateShaderResourceView(&tex, None, Some(&mut srv))
-                .context("CreateShaderResourceView(cursor shape)")?;
-            self.shape = Some((ov.serial, srv.context("null cursor shape srv")?, ov.w, ov.h));
-            Ok(())
-        }
-    }
-
-    /// Alpha-blend `ov` onto `dst` (frame-sized, RENDER_TARGET-capable — the blend scratch).
-    /// `linear_scale`: 0 = SDR passthrough; non-zero = the frame is FP16 scRGB (HDR
-    /// composition) — linearize and scale to the target's SDR white. The quad is placed purely
-    /// via the viewport (the fullscreen-triangle VS fills whatever viewport is set), clipped by
-    /// the target automatically.
-    pub(super) unsafe fn blend(
-        &mut self,
-        device: &ID3D11Device,
-        ctx: &ID3D11DeviceContext,
-        dst: &ID3D11Texture2D,
-        ov: &pf_frame::CursorOverlay,
-        linear_scale: f32,
-    ) -> Result<()> {
-        // SAFETY: all D3D11 work on the caller's live `device`/`ctx` borrows. The
-        // `copy_nonoverlapping` writes `cb.len()` `f32`s into the pointer the immediately preceding
-        // `Map` of `self.cbuf` (16 bytes = 4×`f32`, DYNAMIC/WRITE_DISCARD) returned, inside the
-        // `is_ok()` arm and before the paired `Unmap`. `ensure_shape` forwards this fn's `device`
-        // borrow, and every `*Set*`/`Draw` takes borrowed slices of live locals or clones of live COM
-        // interfaces.
-        unsafe {
-            self.ensure_shape(device, ov)?;
-            let (_, srv, w, h) = self.shape.as_ref().expect("shape just ensured");
-            if self.cbuf_scale != Some(linear_scale) {
-                let cb: [f32; 4] = [linear_scale, 0.0, 0.0, 0.0];
-                let mut mapped = D3D11_MAPPED_SUBRESOURCE::default();
-                if ctx
-                    .Map(&self.cbuf, 0, D3D11_MAP_WRITE_DISCARD, 0, Some(&mut mapped))
-                    .is_ok()
-                {
-                    std::ptr::copy_nonoverlapping(cb.as_ptr(), mapped.pData as *mut f32, cb.len());
-                    ctx.Unmap(&self.cbuf, 0);
-                    // Cache ONLY on a successful upload. Caching unconditionally meant one transient
-                    // `Map` failure wedged the HDR/SDR cursor scale for the rest of the session: the
-                    // buffer still held the OLD value while this believed it held the new one, and
-                    // no later call would retry. On failure the cache is left alone and the next
-                    // blend tries again — a stale scale for a frame instead of forever.
-                    self.cbuf_scale = Some(linear_scale);
-                }
-            }
-            let mut rtv: Option<ID3D11RenderTargetView> = None;
-            device
-                .CreateRenderTargetView(dst, None, Some(&mut rtv))
-                .context("CreateRenderTargetView(cursor blend scratch)")?;
-            let rtv = rtv.context("null cursor blend rtv")?;
-
-            ctx.OMSetRenderTargets(Some(&[Some(rtv)]), None);
-            ctx.OMSetBlendState(&self.blend, None, 0xffff_ffff);
-            ctx.VSSetShader(&self.vs, None);
-            ctx.PSSetShader(&self.ps, None);
-            ctx.PSSetShaderResources(0, Some(&[Some(srv.clone())]));
-            ctx.PSSetSamplers(0, Some(&[Some(self.sampler.clone())]));
-            ctx.PSSetConstantBuffers(0, Some(&[Some(self.cbuf.clone())]));
-            ctx.IASetInputLayout(None);
-            ctx.IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
-            // Placement IS the viewport: the VS fills it, the OS clips it to the target.
-            let vp = D3D11_VIEWPORT {
-                TopLeftX: ov.x as f32,
-                TopLeftY: ov.y as f32,
-                Width: *w as f32,
-                Height: *h as f32,
-                MinDepth: 0.0,
-                MaxDepth: 1.0,
-            };
-            ctx.RSSetViewports(Some(&[vp]));
-            ctx.Draw(3, 0);
-            // Unbind so the scratch can be bound as a conversion INPUT without a hazard warning.
-            ctx.OMSetRenderTargets(None, None);
-            let none_srv: [Option<ID3D11ShaderResourceView>; 1] = [None];
-            ctx.PSSetShaderResources(0, Some(&none_srv));
-            Ok(())
-        }
-    }
-}
@@ -1,795 +0,0 @@
-//! GDI cursor poller — the Windows cursor-SHAPE source for the cursor-forward channel
-//! (design/remote-desktop-sweep.md §8, the M2c redesign).
-//!
-//! Why not the IddCx hardware-cursor query (the v5 `CursorShm` path, now the fallback): it is
-//! alpha-only BY DESIGN — `IDDCX_CURSOR_SHAPE_TYPE` has no monochrome value, the OS pre-converts
-//! monochrome to masked-color (IDDCX_CURSOR_CAPS docs), and masked-color delivery is dead code on
-//! modern builds (proven on-glass at every `ColorXorCursorSupport` level; no public evidence of a
-//! MASKED_COLOR delivery anywhere). The driver keeps its hardware cursor declared at XOR FULL
-//! purely so DWM EXCLUDES every cursor type from the IDD frame.
-//!
-//! Why not DXGI Desktop Duplication `GetFramePointerShape`: its `PointerPosition.Visible` goes
-//! stale when the cursor moves only via injected input on current Win11 (Sunshine #5293 — exactly
-//! a Punktfunk session's topology), it burns one of the session's four duplication slots, and its
-//! per-output metadata on IDD monitors has conflicting field reports. The GDI path below is the
-//! metadata-forwarding-remote-desktop pattern (RustDesk, WebRTC/Chrome Remote Desktop, OBS): the
-//! cursor is per-session global state in win32k, readable cross-process, and `CURSOR_SHOWING` is
-//! the logical visibility — immune to all of the above.
-//!
-//! Works because the capture host runs as SYSTEM *inside the interactive session* on
-//! `winsta0\default` (the service supervisor retargets the token — `windows/service.rs`
-//! `spawn_host`), so the poller thread sees the session's cursor directly; no helper process.
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use super::*;
-use windows::Win32::Graphics::Gdi::{
-    DeleteObject, GetDC, GetDIBits, GetObjectW, ReleaseDC, BITMAP, BITMAPINFO, BITMAPINFOHEADER,
-    BI_RGB, DIB_RGB_COLORS, HBITMAP, HDC,
-};
-use windows::Win32::System::StationsAndDesktops::{
-    CloseDesktop, GetUserObjectInformationW, OpenInputDesktop, SetThreadDesktop,
-    DESKTOP_ACCESS_FLAGS, DESKTOP_CONTROL_FLAGS, HDESK, UOI_NAME,
-};
-use windows::Win32::UI::HiDpi::{
-    SetThreadDpiAwarenessContext, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2,
-};
-use windows::Win32::UI::WindowsAndMessaging::{
-    CopyIcon, DestroyIcon, GetCursorInfo, GetIconInfo, CURSORINFO, HICON, ICONINFO,
-};
-
-/// `CURSORINFO.flags` bits (WindowsAndMessaging): the pointer is logically shown /
-/// touch-or-pen-suppressed. Named locally so the visibility rule below reads as the docs do.
-const CURSOR_SHOWING: u32 = 0x1;
-const CURSOR_SUPPRESSED: u32 = 0x2;
-
-/// A converted shape: the cache the per-tick overlay is assembled from. `rgba` is `Arc` so the
-/// slot publish (and every downstream frame attach) is a refcount bump.
-struct Shape {
-    rgba: std::sync::Arc<Vec<u8>>,
-    w: u32,
-    h: u32,
-    hot_x: u32,
-    hot_y: u32,
-    serial: u64,
-}
-
-/// Off-thread GDI cursor poller. Samples `GetCursorInfo` at ~60 Hz, rasterises the `HCURSOR` only
-/// when its handle value changes, and publishes a ready [`pf_frame::CursorOverlay`] snapshot; the
-/// capture thread's per-tick cost is one uncontended mutex read + an `Arc` clone
-/// (same split as [`DescriptorPoller`], and for the same reason: user32/gdi32 calls have no place
-/// on the capture/encode thread).
-pub(super) struct CursorPoller {
-    slot: Arc<Mutex<Option<pf_frame::CursorOverlay>>>,
-    stop: Arc<AtomicBool>,
-    /// The input desktop is a SECURE desktop (Winlogon — UAC consent / lock / logon). Classified
-    /// on every reattach; the capturer polls it to stand the IddCx hardware-cursor declare down
-    /// while the secure desktop needs the software-cursor path to render (see
-    /// `IddPushCapturer::poll_secure_desktop`).
-    secure: Arc<AtomicBool>,
-    thread: Option<std::thread::JoinHandle<()>>,
-}
-
-impl CursorPoller {
-    /// ~250 Hz: the polled position is ALSO the composite-blend position (capture model), so
-    /// it must out-pace the fastest session — at 16 ms a 240 fps stream re-used a stale
-    /// position for ~4 consecutive frames and the composited pointer visibly stuttered
-    /// against the video. A tick is one `GetCursorInfo` syscall (rasterisation only on shape
-    /// change), so 250 Hz is still negligible CPU.
-    const INTERVAL: Duration = Duration::from_millis(4);
-    /// Unconditional input-desktop reattach cadence — catches secure-desktop (UAC/lock) switches
-    /// without a failure signal (`GetCursorInfo` on a stale desktop *succeeds* with stale data).
-    /// 250 ms, not the original 2 s: the reattach now also feeds [`Self::secure_desktop`], which
-    /// gates when the secure desktop becomes VISIBLE in the stream (the hardware-cursor
-    /// stand-down) — a 2 s freeze at every UAC prompt is user-visible, ~4 `OpenInputDesktop`
-    /// syscalls/s are not.
-    const REATTACH: Duration = Duration::from_millis(250);
-    /// Cadence of the same-handle extent re-probe (see the [`run`] loop). Display-scale changes are
-    /// human/OS-timescale events and the probe reads dimensions only — no pixel copy — so 4 Hz is
-    /// both ample and negligible, and a ≤250 ms lag on the pointer's size is imperceptible.
-    const EXTENT_PROBE: Duration = Duration::from_millis(250);
-
-    /// Spawn the poller for the virtual display `target_id`. `rect` SEEDS the target's desktop rect
-    /// (`source_desktop_rect` order: x, y, w, h) — cursor positions are desktop-global; the
-    /// overlay wants frame-relative, and a pointer outside the rect reports `visible: false`
-    /// (per-output semantics, matching the driver shm path and the Linux portal).
-    ///
-    /// A SEED, not the value: the poll thread re-queries the rect on its [`Self::REATTACH`] cadence.
-    /// It used to be captured once here and used forever for BOTH the desktop→frame offset and the
-    /// `in_rect` test, while both mid-session mode-change paths (`resize_output` and
-    /// `poll_display_hdr` → `recreate_ring`) keep the same poller — so after an in-place resize the
-    /// pointer was clipped to the OLD rect and offset by a stale origin. Re-querying on the poll
-    /// thread is what keeps the CCD call off the capture/encode thread, which is the whole reason
-    /// this poller exists (see `DescriptorPoller`).
-    pub(super) fn spawn(target_id: u32, rect: (i32, i32, i32, i32)) -> Self {
-        let slot: Arc<Mutex<Option<pf_frame::CursorOverlay>>> = Arc::new(Mutex::new(None));
-        let stop = Arc::new(AtomicBool::new(false));
-        let secure = Arc::new(AtomicBool::new(false));
-        let (slot_t, stop_t, secure_t) = (slot.clone(), stop.clone(), secure.clone());
-        let thread = std::thread::Builder::new()
-            .name("pf-cursor-poll".into())
-            .spawn(move || run(target_id, rect, &slot_t, &stop_t, &secure_t))
-            .ok();
-        if thread.is_none() {
-            tracing::warn!("cursor poller thread spawn failed — cursor falls back to driver shm");
-        }
-        Self {
-            slot,
-            stop,
-            secure,
-            thread,
-        }
-    }
-
-    /// The latest overlay snapshot (`None` until the first successful shape rasterisation).
-    pub(super) fn read(&self) -> Option<pf_frame::CursorOverlay> {
-        self.slot.lock().unwrap_or_else(|p| p.into_inner()).clone()
-    }
-
-    /// Whether the input desktop is currently a SECURE desktop (UAC consent / Winlogon lock or
-    /// logon). Latched by the poll thread on its reattach cadence (≤ [`Self::REATTACH`] stale).
-    pub(super) fn secure_desktop(&self) -> bool {
-        self.secure.load(Ordering::Relaxed)
-    }
-
-    /// Whether the worker thread is (still) alive — `false` degrades the capturer to the shm read.
-    pub(super) fn alive(&self) -> bool {
-        self.thread.as_ref().is_some_and(|t| !t.is_finished())
-    }
-}
-
-impl Drop for CursorPoller {
-    fn drop(&mut self) {
-        self.stop.store(true, Ordering::Relaxed);
-        if let Some(t) = self.thread.take() {
-            let _ = t.join(); // worker sleeps ≤ INTERVAL — a bounded join
-        }
-    }
-}
-
-/// The poll loop. Owns the thread's input-desktop binding and the shape cache.
-fn run(
-    target_id: u32,
-    mut rect: (i32, i32, i32, i32),
-    slot: &Mutex<Option<pf_frame::CursorOverlay>>,
-    stop: &AtomicBool,
-    secure: &AtomicBool,
-) {
-    // Physical-pixel coordinates on this thread regardless of the process's DPI awareness:
-    // `rect` comes from CCD (always physical), and a DPI-virtualized `GetCursorInfo` position
-    // would land in the wrong frame pixel on any scaled display. Thread-scoped, so the rest of
-    // the host is untouched.
-    // SAFETY: takes and returns only a by-value context handle; affects this thread only.
-    let _ = unsafe { SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) };
-
-    let mut desktop = DesktopBinding::default();
-    // best-effort: already on winsta0\default if this fails
-    publish_secure(secure, desktop.reattach());
-    let mut last_attach = Instant::now();
-
-    let mut shape: Option<Shape> = None;
-    let mut cached_handle: isize = 0;
-    let mut failed_handle: isize = 0; // don't re-rasterise a failing handle every tick
-    let mut serial: u64 = 0;
-    let mut logged_live = false;
-    let mut last_extent = Instant::now();
-
-    while !stop.load(Ordering::Relaxed) {
-        std::thread::sleep(CursorPoller::INTERVAL);
-        if last_attach.elapsed() >= CursorPoller::REATTACH {
-            last_attach = Instant::now();
-            publish_secure(secure, desktop.reattach());
-            // …and re-read the target's desktop rect on the same cadence: a mid-session resize (or
-            // an HDR recreate, or the user moving this display in the desktop arrangement) changes
-            // BOTH the origin the position is made relative to and the extent `in_rect` tests
-            // against, and this poller outlives all of them. `None` keeps the last good value — a
-            // transient CCD failure must not park the pointer at a `(0, 0, 0, 0)` rect, which would
-            // report every position invisible.
-            //
-            // SAFETY: `source_desktop_rect` is an `unsafe fn` running the read-only CCD
-            // `QueryDisplayConfig` over owned local buffers; the `Copy` target id crosses by value
-            // and it returns owned `(x, y, w, h)` values, borrowing nothing.
-            let fresh = unsafe { pf_win_display::win_display::source_desktop_rect(target_id) };
-            if let Some(fresh) = fresh {
-                if fresh != rect {
-                    tracing::info!(
-                        target_id,
-                        from = ?rect,
-                        to = ?fresh,
-                        "cursor poller: target desktop rect changed — re-basing pointer positions"
-                    );
-                    rect = fresh;
-                }
-            }
-        }
-
-        let mut ci = CURSORINFO {
-            cbSize: std::mem::size_of::<CURSORINFO>() as u32,
-            ..Default::default()
-        };
-        // SAFETY: `ci` is a live, correctly-sized out-param for this synchronous call; no pointer
-        // escapes it.
-        if unsafe { GetCursorInfo(&mut ci) }.is_err() {
-            // Desktop went away under us (secure-desktop switch mid-call) — rebind and retry
-            // next tick; the slot keeps its last snapshot meanwhile.
-            publish_secure(secure, desktop.reattach());
-            last_attach = Instant::now();
-            continue;
-        }
-
-        let flags = ci.flags.0;
-        let showing = flags & CURSOR_SHOWING != 0 && flags & CURSOR_SUPPRESSED == 0;
-
-        // Rasterise on handle change only (position-only ticks are a header update). Hidden
-        // cursors keep the cached shape — the forwarder's hidden-but-known contract needs the
-        // bitmap to have been seen. v1: animated cursors publish their first frame (the OBS
-        // behavior); frame cycling via DrawIconEx istep is a known follow-up.
-        let handle = ci.hCursor.0 as isize;
-
-        // …but the handle alone CANNOT see a re-render. Windows rebuilds the system cursors at a
-        // new size whenever the scale under the pointer changes — crossing to a differently-scaled
-        // monitor, or a monitor's own scale settling after a mode change (a fresh virtual display
-        // is created at the RECOMMENDED scale and gets the client's saved `PerMonitorSettings`
-        // override a beat later) — while the SHARED handle stays put for the session's life (the
-        // arrow is 0x10003 throughout). Keyed on the handle alone the cache latched whatever size
-        // the pointer happened to have when the poller started and never let go: a session that
-        // sampled inside that pre-settle window forwarded — and composited — a 96 px pointer over
-        // a 100 % desktop until it ended, which is exactly the "cursor is 3× too big while
-        // everything else is fine" report. Re-read the bitmap's EXTENT on a slow cadence
-        // (dimensions only, no pixel copy) and drop the cache when it moved.
-        if showing && handle != 0 && handle == cached_handle {
-            if last_extent.elapsed() >= CursorPoller::EXTENT_PROBE {
-                last_extent = Instant::now();
-                if let (Some(now), Some(s)) = (cursor_extent(ci.hCursor), shape.as_ref()) {
-                    if now != (s.w, s.h) {
-                        tracing::info!(
-                            target_id,
-                            "cursor: the pointer bitmap resized under a stable handle \
-                             ({}x{} -> {}x{}) — re-rasterising (the scale under the pointer moved)",
-                            s.w,
-                            s.h,
-                            now.0,
-                            now.1
-                        );
-                        cached_handle = 0; // re-rasterise below, on this same tick
-                    }
-                }
-            }
-        } else {
-            // A handle change re-rasterises on its own — hold the probe off so it can't fire on
-            // the very next tick against a shape that is current by construction.
-            last_extent = Instant::now();
-        }
-
-        if showing && handle != 0 && handle != cached_handle && handle != failed_handle {
-            match rasterize(ci.hCursor) {
-                Some((rgba, w, h, hot_x, hot_y)) => {
-                    serial += 1;
-                    shape = Some(Shape {
-                        rgba: std::sync::Arc::new(rgba),
-                        w,
-                        h,
-                        hot_x,
-                        hot_y,
-                        serial,
-                    });
-                    cached_handle = handle;
-                    failed_handle = 0;
-                    if !logged_live {
-                        logged_live = true;
-                        tracing::info!(
-                            target_id,
-                            "cursor poller live — GDI shape source publishing (serial 1: {w}x{h})"
-                        );
-                    }
-                }
-                None => {
-                    // The owning app may have destroyed the cursor mid-read; keep the previous
-                    // shape and don't hammer this handle again until it changes.
-                    failed_handle = handle;
-                }
-            }
-        }
-
-        let overlay = shape.as_ref().map(|s| {
-            let (px, py) = (ci.ptScreenPos.x - rect.0, ci.ptScreenPos.y - rect.1);
-            let in_rect = px >= 0 && py >= 0 && px < rect.2 && py < rect.3;
-            pf_frame::CursorOverlay {
-                // Overlay x/y = bitmap top-left (reported position − hotspot), frame pixels.
-                x: px - s.hot_x as i32,
-                y: py - s.hot_y as i32,
-                w: s.w,
-                h: s.h,
-                rgba: s.rgba.clone(),
-                serial: s.serial,
-                hot_x: s.hot_x,
-                hot_y: s.hot_y,
-                visible: showing && in_rect,
-            }
-        });
-        *slot.lock().unwrap_or_else(|p| p.into_inner()) = overlay;
-    }
-}
-
-/// Store a reattach's secure-desktop verdict (`None` = classification unavailable — keep the
-/// previous state rather than flapping the capturer's hardware-cursor stand-down).
-fn publish_secure(secure: &AtomicBool, verdict: Option<bool>) {
-    if let Some(s) = verdict {
-        secure.store(s, Ordering::Relaxed);
-    }
-}
-
-/// The thread's owned input-desktop handle — the [`SendInputInjector`] reattach model
-/// (`pf-inject` sendinput.rs): keep the current binding, swap on demand, close exactly once.
-#[derive(Default)]
-struct DesktopBinding(Option<HDESK>);
-
-impl DesktopBinding {
-    /// Rebind to the CURRENT input desktop. Returns whether that desktop is a SECURE one
-    /// (`UOI_NAME` != "Default": "Winlogon" during UAC consent / lock / logon) — `None` when the
-    /// input desktop could not be opened, in which case the binding (and the caller's secure
-    /// state) stays put.
-    fn reattach(&mut self) -> Option<bool> {
-        const GENERIC_ALL: u32 = 0x1000_0000;
-        // SAFETY: `OpenInputDesktop`/`SetThreadDesktop`/`CloseDesktop` take only by-value args.
-        // `OpenInputDesktop` yields an owned `HDESK` only on `Ok`; it is either installed (and the
-        // previously-owned handle closed exactly once) or closed on failure — no handle is leaked
-        // or used after close. `SetThreadDesktop` rebinds only this calling thread (which owns
-        // no windows/hooks, so the rebind cannot fail on that account).
-        unsafe {
-            match OpenInputDesktop(
-                DESKTOP_CONTROL_FLAGS(0),
-                false,
-                DESKTOP_ACCESS_FLAGS(GENERIC_ALL),
-            ) {
-                Ok(h) => {
-                    let secure = desktop_is_secure(h);
-                    if SetThreadDesktop(h).is_ok() {
-                        if let Some(old) = self.0.replace(h) {
-                            let _ = CloseDesktop(old);
-                        }
-                    } else {
-                        let _ = CloseDesktop(h);
-                    }
-                    Some(secure)
-                }
-                Err(_) => None, // not privileged for this desktop; stay put
-            }
-        }
-    }
-}
-
-/// `UOI_NAME` of `h` != "Default" — i.e. the input desktop is Winlogon (UAC consent / lock /
-/// logon) or a screen-saver desktop, both of which need the OS's software-cursor render path.
-/// Unnameable desktops read as NOT secure: the only in-contract failure is a too-small buffer,
-/// and misreading secure-as-normal merely keeps today's behavior for a beat.
-fn desktop_is_secure(h: HDESK) -> bool {
-    let mut name = [0u16; 64]; // "Default"/"Winlogon"/"Screen-saver" all fit with room to spare
-    let mut needed = 0u32;
-    // SAFETY: `h` is the live desktop handle the caller just opened; `name`/`needed` are live
-    // out-params sized exactly as passed; the call writes at most `nlength` bytes.
-    let ok = unsafe {
-        GetUserObjectInformationW(
-            windows::Win32::Foundation::HANDLE(h.0),
-            UOI_NAME,
-            Some(name.as_mut_ptr().cast()),
-            (name.len() * 2) as u32,
-            Some(&mut needed),
-        )
-    };
-    if ok.is_err() {
-        return false;
-    }
-    let len = name.iter().position(|&c| c == 0).unwrap_or(name.len());
-    let name = String::from_utf16_lossy(&name[..len]);
-    !name.eq_ignore_ascii_case("Default")
-}
-
-impl Drop for DesktopBinding {
-    fn drop(&mut self) {
-        if let Some(h) = self.0.take() {
-            // SAFETY: `h` is our owned desktop handle, closed exactly once here.
-            let _ = unsafe { CloseDesktop(h) };
-        }
-    }
-}
-
-/// Rasterise `hcursor` to straight-alpha RGBA: `(rgba, w, h, hot_x, hot_y)`. `None` on any
-/// failure (caller keeps the previous shape).
-fn rasterize(hcursor: windows::Win32::UI::WindowsAndMessaging::HCURSOR) -> RasterOut {
-    // CopyIcon first: the owning process can destroy its HCURSOR between GetCursorInfo and the
-    // reads below; the copy is ours (the OBS/WebRTC guard).
-    // SAFETY: `HICON(hcursor.0)` reinterprets the cursor handle as an icon handle (cursors ARE
-    // icons in user32); CopyIcon yields an owned HICON we destroy below.
-    let Ok(icon) = (unsafe { CopyIcon(HICON(hcursor.0)) }) else {
-        return None;
-    };
-    let mut ii = ICONINFO::default();
-    // SAFETY: `ii` is a live out-param. On Ok it hands us COPIES of the mask/color bitmaps —
-    // both deleted below (GDI-handle leak otherwise).
-    let got = unsafe { GetIconInfo(icon, &mut ii) };
-    let out = if got.is_ok() { convert(&ii) } else { None };
-    // SAFETY: deleting the two bitmap copies GetIconInfo returned (null-safe: DeleteObject on a
-    // null HGDIOBJ fails harmlessly) and the icon copy — each exactly once.
-    unsafe {
-        let _ = DeleteObject(ii.hbmColor.into());
-        let _ = DeleteObject(ii.hbmMask.into());
-        let _ = DestroyIcon(icon);
-    }
-    out.map(|(rgba, w, h)| {
-        let hot_x = ii.xHotspot.min(w.saturating_sub(1));
-        let hot_y = ii.yHotspot.min(h.saturating_sub(1));
-        (rgba, w, h, hot_x, hot_y)
-    })
-}
-
-type RasterOut = Option<(Vec<u8>, u32, u32, u32, u32)>;
-
-/// The CURRENT bitmap extent of `hcursor` — exactly the `(w, h)` [`convert`] would derive, without
-/// the pixel read. Feeds the poll loop's staleness check (a re-render keeps the handle, see there).
-/// `None` on any failure, which the caller reads as "no verdict" and keeps its cached shape.
-fn cursor_extent(hcursor: windows::Win32::UI::WindowsAndMessaging::HCURSOR) -> Option<(u32, u32)> {
-    // CopyIcon first, for the reason `rasterize` does it: the owning process can destroy its
-    // HCURSOR between GetCursorInfo and the reads below; the copy is ours.
-    // SAFETY: `HICON(hcursor.0)` reinterprets the cursor handle as an icon handle (cursors ARE
-    // icons in user32); CopyIcon yields an owned HICON destroyed below.
-    let icon = unsafe { CopyIcon(HICON(hcursor.0)) }.ok()?;
-    let mut ii = ICONINFO::default();
-    // SAFETY: `ii` is a live out-param. On Ok it hands us COPIES of the mask/color bitmaps — both
-    // deleted below (GDI-handle leak otherwise).
-    let got = unsafe { GetIconInfo(icon, &mut ii) };
-    // Mirrors `convert`'s two families: a color cursor's extent is its color bitmap's; a
-    // monochrome one's mask carries the AND plane OVER the XOR plane, so its height is doubled.
-    let extent = got.is_ok().then_some(()).and_then(|()| {
-        if !ii.hbmColor.is_invalid() {
-            bitmap_extent(ii.hbmColor)
-        } else {
-            let (w, h) = bitmap_extent(ii.hbmMask)?;
-            (h >= 2 && h % 2 == 0).then_some((w, h / 2))
-        }
-    });
-    // SAFETY: deleting the two bitmap copies GetIconInfo returned (null-safe: DeleteObject on a
-    // null HGDIOBJ fails harmlessly) and the icon copy — each exactly once.
-    unsafe {
-        let _ = DeleteObject(ii.hbmColor.into());
-        let _ = DeleteObject(ii.hbmMask.into());
-        let _ = DestroyIcon(icon);
-    }
-    extent
-}
-
-/// A GDI bitmap's dimensions, under [`read_bitmap_32`]'s sanity caps so the two agree on what a
-/// plausible cursor is — a bitmap `rasterize` would reject must not read here as a size CHANGE.
-fn bitmap_extent(hbm: HBITMAP) -> Option<(u32, u32)> {
-    let mut bm = BITMAP::default();
-    // SAFETY: `bm` is a live out-param sized exactly as passed; GetObjectW only writes into it.
-    let n = unsafe {
-        GetObjectW(
-            hbm.into(),
-            std::mem::size_of::<BITMAP>() as i32,
-            Some((&mut bm as *mut BITMAP).cast()),
-        )
-    };
-    if n == 0 || bm.bmWidth <= 0 || bm.bmHeight <= 0 || bm.bmWidth > 512 || bm.bmHeight > 1024 {
-        return None;
-    }
-    Some((bm.bmWidth as u32, bm.bmHeight as u32))
-}
-
-/// Convert the ICONINFO bitmaps to straight RGBA. Two families:
-/// - color (`hbmColor` set): 32bpp BGRA; if the alpha channel is entirely empty (old-style
-///   cursors) the AND mask supplies it (mask bit 1 = transparent).
-/// - monochrome (`hbmColor` null): `hbmMask` is DOUBLE height — AND plane over XOR plane, the
-///   WebRTC truth table: (0,0) black, (0,1) white, (1,0) transparent, (1,1) invert. Invert
-///   pixels — unrepresentable in straight alpha — become opaque black with a white outline
-///   grown into adjacent transparency (the WebRTC approximation; keeps the I-beam legible on
-///   any background, which the old translucent-gray stand-in did not).
-fn convert(ii: &ICONINFO) -> Option<(Vec<u8>, u32, u32)> {
-    // SAFETY: GetDC(None) yields the screen DC, released below on every path; it is only used
-    // as the GetDIBits reference DC.
-    let dc = unsafe { GetDC(None) };
-    let result = (|| {
-        if !ii.hbmColor.is_invalid() {
-            let color = read_bitmap_32(dc, ii.hbmColor)?;
-            let (w, h) = (color.w as u32, color.h as u32);
-            let mut rgba = bgra_to_rgba(&color.bgra);
-            if alpha_is_empty(&rgba) {
-                // Alpha-less color cursor: transparency lives in the AND mask.
-                let mask = read_bitmap_32(dc, ii.hbmMask)?;
-                if mask.w != color.w || mask.h < color.h {
-                    return None;
-                }
-                apply_and_mask_alpha(&mut rgba, &mask.bgra);
-            }
-            Some((rgba, w, h))
-        } else {
-            let mask = read_bitmap_32(dc, ii.hbmMask)?;
-            if mask.h < 2 || mask.h % 2 != 0 {
-                return None;
-            }
-            let (w, h) = (mask.w as usize, (mask.h / 2) as usize);
-            let (and_plane, xor_plane) = mask.bgra.split_at(h * w * 4);
-            let rgba = mono_planes_to_rgba(and_plane, xor_plane, w, h);
-            Some((rgba, w as u32, h as u32))
-        }
-    })();
-    // SAFETY: releasing the screen DC obtained above, exactly once.
-    unsafe {
-        ReleaseDC(None, dc);
-    }
-    result
-}
-
-const NEIGHBORS: [(i32, i32); 8] = [
-    (-1, -1),
-    (0, -1),
-    (1, -1),
-    (-1, 0),
-    (1, 0),
-    (-1, 1),
-    (0, 1),
-    (1, 1),
-];
-
-struct RawBitmap {
-    w: i32,
-    h: i32,
-    /// 32bpp top-down BGRA rows, `w*h*4` (monochrome sources arrive expanded: 0x00/0xFF channels).
-    bgra: Vec<u8>,
-}
-
-/// Read any GDI bitmap as 32bpp top-down via `GetDIBits` (which performs the 1bpp→32bpp
-/// expansion for the mask planes).
-fn read_bitmap_32(dc: HDC, hbm: HBITMAP) -> Option<RawBitmap> {
-    let mut bm = BITMAP::default();
-    // SAFETY: `bm` is a live out-param sized exactly as passed; GetObjectW only writes into it.
-    let n = unsafe {
-        GetObjectW(
-            hbm.into(),
-            std::mem::size_of::<BITMAP>() as i32,
-            Some((&mut bm as *mut BITMAP).cast()),
-        )
-    };
-    if n == 0 || bm.bmWidth <= 0 || bm.bmHeight <= 0 || bm.bmWidth > 512 || bm.bmHeight > 1024 {
-        return None; // 512/1024: sanity caps (256² is the wire max; XL accessibility ≤ that)
-    }
-    let (w, h) = (bm.bmWidth, bm.bmHeight);
-    let mut info = BITMAPINFO {
-        bmiHeader: BITMAPINFOHEADER {
-            biSize: std::mem::size_of::<BITMAPINFOHEADER>() as u32,
-            biWidth: w,
-            biHeight: -h, // top-down
-            biPlanes: 1,
-            biBitCount: 32,
-            biCompression: BI_RGB.0,
-            ..Default::default()
-        },
-        ..Default::default()
-    };
-    let mut buf = vec![0u8; (w as usize) * (h as usize) * 4];
-    // SAFETY: `buf` spans exactly `h` rows of `w` 32bpp pixels as described by `info`; both are
-    // live locals for this synchronous call, `hbm` is a live bitmap not selected into any DC
-    // (fresh GetIconInfo copies).
-    let rows = unsafe {
-        GetDIBits(
-            dc,
-            hbm,
-            0,
-            h as u32,
-            Some(buf.as_mut_ptr().cast()),
-            &mut info,
-            DIB_RGB_COLORS,
-        )
-    };
-    (rows != 0).then_some(RawBitmap { w, h, bgra: buf })
-}
-
-fn bgra_to_rgba(bgra: &[u8]) -> Vec<u8> {
-    let mut out = bgra.to_vec();
-    for px in out.chunks_exact_mut(4) {
-        px.swap(0, 2);
-    }
-    out
-}
-
-/// Whether a 32bpp RGBA buffer's alpha channel is entirely zero — the "old-style cursor with no
-/// alpha" test, whose transparency lives in the AND mask instead ([`apply_and_mask_alpha`]).
-fn alpha_is_empty(rgba: &[u8]) -> bool {
-    rgba.chunks_exact(4).all(|p| p[3] == 0)
-}
-
-/// Take alpha from an expanded AND mask: mask WHITE (AND bit 1) means transparent, black opaque.
-/// `mask_bgra` is the 32bpp expansion `GetDIBits` produces from the 1bpp mask, so any non-zero
-/// channel byte is "set".
-fn apply_and_mask_alpha(rgba: &mut [u8], mask_bgra: &[u8]) {
-    for (px, m) in rgba.chunks_exact_mut(4).zip(mask_bgra.chunks_exact(4)) {
-        px[3] = if m[0] != 0 { 0 } else { 0xFF };
-    }
-}
-
-/// The monochrome-cursor truth table, plus the white outline that makes an INVERT region legible.
-///
-/// A monochrome `HCURSOR` has no colour bitmap: `hbmMask` is DOUBLE height — the AND plane over the
-/// XOR plane — and the pair encodes four states (the WebRTC/Chromium table):
-///
-/// | AND | XOR | meaning     | straight-alpha result                    |
-/// |-----|-----|-------------|------------------------------------------|
-/// | 0   | 0   | black       | opaque black                             |
-/// | 0   | 1   | white       | opaque white                             |
-/// | 1   | 0   | transparent | fully transparent                        |
-/// | 1   | 1   | INVERT dst  | opaque black + a grown white outline     |
-///
-/// INVERT is unrepresentable in straight alpha (it is a per-pixel XOR against whatever is behind
-/// it), so it becomes opaque black and every TRANSPARENT 8-neighbour of an invert pixel is turned
-/// opaque white. That outline is what keeps the text I-beam — which is almost entirely invert
-/// pixels — legible over dark content; the earlier translucent-grey stand-in did not.
-///
-/// Extracted from `convert`'s GDI plumbing (sweep Phase 6.6) so the table is testable: the caller
-/// needs a live `HCURSOR` and a screen DC, this needs two byte slices.
-fn mono_planes_to_rgba(and_plane: &[u8], xor_plane: &[u8], w: usize, h: usize) -> Vec<u8> {
-    let mut rgba = vec![0u8; w * h * 4];
-    let mut invert = vec![false; w * h];
-    for i in 0..w * h {
-        let (a, x) = (and_plane[i * 4] != 0, xor_plane[i * 4] != 0);
-        let px = &mut rgba[i * 4..i * 4 + 4];
-        match (a, x) {
-            (false, false) => px.copy_from_slice(&[0, 0, 0, 0xFF]),
-            (false, true) => px.copy_from_slice(&[0xFF, 0xFF, 0xFF, 0xFF]),
-            (true, false) => {} // transparent (already zeroed)
-            (true, true) => {
-                px.copy_from_slice(&[0, 0, 0, 0xFF]);
-                invert[i] = true;
-            }
-        }
-    }
-    for y in 0..h as i32 {
-        for x in 0..w as i32 {
-            if !invert[(y * w as i32 + x) as usize] {
-                continue;
-            }
-            for (dx, dy) in NEIGHBORS {
-                let (nx, ny) = (x + dx, y + dy);
-                if nx < 0 || ny < 0 || nx >= w as i32 || ny >= h as i32 {
-                    continue;
-                }
-                let o = (ny * w as i32 + nx) as usize * 4;
-                if rgba[o + 3] == 0 {
-                    rgba[o..o + 4].copy_from_slice(&[0xFF, 0xFF, 0xFF, 0xFF]);
-                }
-            }
-        }
-    }
-    rgba
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// Expand a 1-bit-per-pixel plane (as `GetDIBits` does) into the 32bpp form the converters read:
-    /// any non-zero channel byte means "bit set".
-    fn plane(bits: &[u8]) -> Vec<u8> {
-        bits.iter()
-            .flat_map(|&b| {
-                let v = if b != 0 { 0xFF } else { 0 };
-                [v, v, v, 0]
-            })
-            .collect()
-    }
-
-    fn px(rgba: &[u8], i: usize) -> [u8; 4] {
-        rgba[i * 4..i * 4 + 4].try_into().unwrap()
-    }
-
-    const OPAQUE_BLACK: [u8; 4] = [0, 0, 0, 0xFF];
-    const OPAQUE_WHITE: [u8; 4] = [0xFF, 0xFF, 0xFF, 0xFF];
-    const TRANSPARENT: [u8; 4] = [0, 0, 0, 0];
-
-    /// All four AND/XOR states, in one 4×1 row — the table `mono_planes_to_rgba` documents.
-    #[test]
-    fn the_monochrome_truth_table_is_exact() {
-        //          (0,0) black  (0,1) white  (1,0) transparent  (1,1) invert
-        let and = plane(&[0, 0, 1, 1]);
-        let xor = plane(&[0, 1, 0, 1]);
-        let out = mono_planes_to_rgba(&and, &xor, 4, 1);
-        assert_eq!(px(&out, 0), OPAQUE_BLACK, "AND=0 XOR=0 ⇒ black");
-        assert_eq!(px(&out, 1), OPAQUE_WHITE, "AND=0 XOR=1 ⇒ white");
-        // Pixel 2 is transparent by the table, but it is an 8-neighbour of the invert pixel at 3,
-        // so the outline claims it — that IS the documented behaviour.
-        assert_eq!(
-            px(&out, 2),
-            OPAQUE_WHITE,
-            "outline grows into adjacent transparency"
-        );
-        assert_eq!(px(&out, 3), OPAQUE_BLACK, "AND=1 XOR=1 ⇒ black + outline");
-    }
-
-    /// Transparency survives when there is no invert pixel next to it.
-    #[test]
-    fn transparent_pixels_stay_transparent_without_an_invert_neighbour() {
-        let and = plane(&[1, 1, 1, 1]);
-        let xor = plane(&[0, 0, 0, 0]);
-        let out = mono_planes_to_rgba(&and, &xor, 4, 1);
-        for i in 0..4 {
-            assert_eq!(px(&out, i), TRANSPARENT, "pixel {i}");
-        }
-    }
-
-    /// The outline grows into all eight neighbours, and only into TRANSPARENT ones — it must not
-    /// repaint a black or white shape pixel.
-    #[test]
-    fn the_invert_outline_covers_eight_neighbours_and_overwrites_nothing() {
-        // 3×3, invert at the centre, everything else transparent.
-        let and = plane(&[1, 1, 1, 1, 1, 1, 1, 1, 1]);
-        let mut xor = plane(&[0; 9]);
-        for b in &mut xor[4 * 4..4 * 4 + 3] {
-            *b = 0xFF; // centre pixel's XOR bit
-        }
-        let out = mono_planes_to_rgba(&and, &xor, 3, 3);
-        assert_eq!(px(&out, 4), OPAQUE_BLACK, "the invert pixel itself");
-        for i in [0, 1, 2, 3, 5, 6, 7, 8] {
-            assert_eq!(px(&out, i), OPAQUE_WHITE, "neighbour {i} outlined");
-        }
-
-        // Now surround it with BLACK shape pixels (AND=0, XOR=0): the outline must leave them alone.
-        let and = plane(&[0, 0, 0, 0, 1, 0, 0, 0, 0]);
-        let out = mono_planes_to_rgba(&and, &xor, 3, 3);
-        for i in [0, 1, 2, 3, 5, 6, 7, 8] {
-            assert_eq!(
-                px(&out, i),
-                OPAQUE_BLACK,
-                "neighbour {i} must not be repainted"
-            );
-        }
-    }
-
-    /// The outline must clip at the bitmap edges rather than wrap to the opposite side.
-    #[test]
-    fn the_outline_clips_at_the_edges() {
-        // 2×2 with the invert at (0, 0): only (1,0), (0,1) and (1,1) can be outlined.
-        let and = plane(&[1, 1, 1, 1]);
-        let mut xor = plane(&[0; 4]);
-        for b in &mut xor[0..3] {
-            *b = 0xFF;
-        }
-        let out = mono_planes_to_rgba(&and, &xor, 2, 2);
-        assert_eq!(px(&out, 0), OPAQUE_BLACK);
-        for i in [1, 2, 3] {
-            assert_eq!(px(&out, i), OPAQUE_WHITE, "in-bounds neighbour {i}");
-        }
-    }
-
-    // ---- the alpha-less colour path ---------------------------------------------------------
-
-    #[test]
-    fn an_empty_alpha_channel_is_detected() {
-        assert!(alpha_is_empty(&[1, 2, 3, 0, 4, 5, 6, 0]));
-        assert!(!alpha_is_empty(&[1, 2, 3, 0, 4, 5, 6, 1]));
-        assert!(alpha_is_empty(&[]), "no pixels ⇒ vacuously empty");
-    }
-
-    /// Mask WHITE (AND bit 1) = transparent, black = opaque — and the colour bytes are untouched.
-    #[test]
-    fn the_and_mask_supplies_alpha_for_an_alpha_less_cursor() {
-        let mut rgba = vec![
-            10, 20, 30, 0, // pixel 0
-            40, 50, 60, 0, // pixel 1
-        ];
-        let mask = plane(&[1, 0]); // pixel 0 masked out, pixel 1 kept
-        apply_and_mask_alpha(&mut rgba, &mask);
-        assert_eq!(px(&rgba, 0), [10, 20, 30, 0], "masked ⇒ transparent");
-        assert_eq!(px(&rgba, 1), [40, 50, 60, 0xFF], "unmasked ⇒ opaque");
-    }
-
-    /// A mask with FEWER pixels than the colour bitmap must not panic — `zip` stops at the shorter
-    /// side, leaving the tail at whatever alpha it had (the caller has already required
-    /// `mask.h >= color.h`, so this is the belt).
-    #[test]
-    fn a_short_mask_does_not_panic() {
-        let mut rgba = vec![1, 2, 3, 0, 4, 5, 6, 0, 7, 8, 9, 0];
-        apply_and_mask_alpha(&mut rgba, &plane(&[0]));
-        assert_eq!(px(&rgba, 0), [1, 2, 3, 0xFF]);
-        assert_eq!(px(&rgba, 1), [4, 5, 6, 0]);
-    }
-}
@@ -1,866 +0,0 @@
-//! IDD-push CONSTRUCTION: everything that runs once, before frames flow.
-//!
-//! The sealed channel's whole bring-up — the render-adapter resolution and its one TEX_FAIL rebind,
-//! the advanced-colour (HDR) negotiation, the shared header + ring + event creation, the channel
-//! delivery, the cursor-channel/poller opt-in, and the bounded first-frame gate — plus the two types
-//! that exist only for it ([`SharedObjectSa`], [`AttachTexFail`]).
-//!
-//! Split out of `idd_push.rs` in sweep Phase 5.4. The steady state (`try_consume`, `repeat_last`,
-//! the pollers, the `Capturer` impl) deliberately stays with the parent: this file is the part you
-//! read when a session will not START, and the parent is the part you read when one stops flowing.
-//! A `#[path]` child sees the parent's private items through `use super::*`, so nothing had to be
-//! made more visible to move here.
-
-use super::*;
-
-/// Build a `SECURITY_ATTRIBUTES` granting GENERIC_ALL to **SYSTEM only** — `D:P(A;;GA;;;SY)`, protected
-/// (no inherited ACEs), `bInheritHandle: false`. The sealed channel makes this the strictly-minimal
-/// DACL: the objects are UNNAMED and the driver reaches them via **duplicated handles** (which carry the
-/// source handle's access — `OpenSharedResourceByName`/`OpenSharedResource1` on a handle does not
-/// re-check the object DACL against the opener), so the pf_vdisplay WUDFHost (LocalService) no longer
-/// needs a DACL ACE. Dropping the `LS` ACE removes the last theoretical surface where a leaked handle or
-/// a name-grown-by-accident could be opened by the (many-service-shared) LocalService SID. Empirically
-/// confirmed unreachable regardless: a LocalService token is DACL-denied `OpenProcess` on the WUDFHost
-/// (`PROCESS_DUP_HANDLE`/`VM_READ`/even `QUERY_LIMITED` → ACCESS_DENIED, tested on the RTX box
-/// 2026-07-03), so it cannot dup the handles out either. History: `Global\`-named + world-openable
-/// (`WD`, security-review 2026-06-28 #5) → SY+LS-scoped → nameless → now SY-only. See
-/// `design/idd-push-security.md`.
-///
-/// RAII, because the descriptor is a `LocalAlloc` the caller must `LocalFree` and the previous
-/// `(SECURITY_ATTRIBUTES, PSECURITY_DESCRIPTOR)` tuple never did — leaking it twice per open (once
-/// for the header section, once for the frame-ready event) and again on every ring recreate. Pairing
-/// them in one owner also enforces the "descriptor must outlive the attributes" rule structurally:
-/// `sa.lpSecurityDescriptor` points at the allocation and [`as_ptr`](Self::as_ptr) only lends a
-/// borrow, so the attributes cannot escape this value's lifetime. Moving the struct is fine — the
-/// pointer targets the heap allocation, not a field.
-struct SharedObjectSa {
-    sa: SECURITY_ATTRIBUTES,
-    psd: PSECURITY_DESCRIPTOR,
-}
-
-impl SharedObjectSa {
-    fn new() -> Result<Self> {
-        let mut psd = PSECURITY_DESCRIPTOR::default();
-        // SAFETY: `ConvertStringSecurityDescriptorToSecurityDescriptorW` reads the `w!()` literal and
-        // writes the descriptor it allocates into the live local `psd`; `?` rejects a failure before
-        // `psd` is read.
-        unsafe {
-            ConvertStringSecurityDescriptorToSecurityDescriptorW(
-                w!("D:P(A;;GA;;;SY)"),
-                SDDL_REVISION_1,
-                &mut psd,
-                None,
-            )
-            .context("build SDDL for IDD-push shared objects")?;
-        }
-        Ok(Self {
-            sa: SECURITY_ATTRIBUTES {
-                nLength: std::mem::size_of::<SECURITY_ATTRIBUTES>() as u32,
-                lpSecurityDescriptor: psd.0,
-                bInheritHandle: false.into(),
-            },
-            psd,
-        })
-    }
-
-    /// The `SECURITY_ATTRIBUTES` to hand a create call, borrowed from this owner.
-    fn as_ptr(&self) -> *const SECURITY_ATTRIBUTES {
-        &self.sa
-    }
-}
-
-impl Drop for SharedObjectSa {
-    fn drop(&mut self) {
-        // SAFETY: `psd` is the descriptor `ConvertStringSecurityDescriptorToSecurityDescriptorW`
-        // allocated for this value and nothing else owns it; `LocalFree` releases it exactly once
-        // (this `Drop` runs once, and `as_ptr` only ever lends a borrow of `sa`).
-        unsafe {
-            let _ = LocalFree(Some(HLOCAL(self.psd.0)));
-        }
-    }
-}
-
-impl IddPushCapturer {
-    /// Create the `RING_LEN` shared keyed-mutex textures for one ring generation, at `format` (matched
-    /// to the display's composition format — FP16 in HDR, BGRA in SDR). Each is shared through an
-    /// UNNAMED NT handle (nothing to open by name — the sealed channel); the driver reaches it only via
-    /// the duplicate the [`ChannelBroker`] sends after the ring is published.
-    pub(super) unsafe fn create_ring_slots(
-        device: &ID3D11Device,
-        w: u32,
-        h: u32,
-        format: DXGI_FORMAT,
-    ) -> Result<Vec<HostSlot>> {
-        // SAFETY: every D3D11/DXGI call is `?`-checked on the live `device` borrow, over
-        // fully-initialized stack descriptors and live out-params; `&sa` stays valid for the whole loop
-        // because `_psd`, the security descriptor backing it, is held in scope alongside.
-        // `OwnedHandle::from_raw_handle` adopts the handle `CreateSharedHandle` JUST minted for this
-        // slot — a unique, still-open NT handle owned by this process — making the slot its sole owner.
-        unsafe {
-            let sa = SharedObjectSa::new()?;
-            let mut slots = Vec::new();
-            for _ in 0..RING_LEN {
-                let desc = D3D11_TEXTURE2D_DESC {
-                    Width: w,
-                    Height: h,
-                    MipLevels: 1,
-                    ArraySize: 1,
-                    // Match the OS-composed swap-chain surfaces so the driver's CopyResource into the slot +
-                    // its format-guard both succeed.
-                    Format: format,
-                    SampleDesc: DXGI_SAMPLE_DESC {
-                        Count: 1,
-                        Quality: 0,
-                    },
-                    Usage: D3D11_USAGE_DEFAULT,
-                    BindFlags: (D3D11_BIND_RENDER_TARGET.0 | D3D11_BIND_SHADER_RESOURCE.0) as u32,
-                    CPUAccessFlags: 0,
-                    MiscFlags: (D3D11_RESOURCE_MISC_SHARED_NTHANDLE.0
-                        | D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX.0)
-                        as u32,
-                };
-                let mut tex: Option<ID3D11Texture2D> = None;
-                device
-                    .CreateTexture2D(&desc, None, Some(&mut tex))
-                    .context("CreateTexture2D(IDD-push ring slot)")?;
-                let tex = tex.context("null ring texture")?;
-                let res1: IDXGIResource1 = tex.cast()?;
-                let shared = res1
-                    .CreateSharedHandle(
-                        Some(sa.as_ptr()),
-                        DXGI_SHARED_RESOURCE_RW,
-                        PCWSTR::null(), // UNNAMED — reachable only through the broker's duplicate
-                    )
-                    .context("CreateSharedHandle(IDD-push ring slot)")?;
-                // Own the shared handle so the slot's `Drop` closes it via RAII (was a manual `CloseHandle`).
-                let shared = OwnedHandle::from_raw_handle(shared.0 as _);
-                let mutex: IDXGIKeyedMutex = tex.cast()?;
-                let mut srv: Option<ID3D11ShaderResourceView> = None;
-                device
-                    .CreateShaderResourceView(&tex, None, Some(&mut srv))
-                    .context("CreateShaderResourceView(IDD-push ring slot)")?;
-                let srv = srv.context("null slot srv")?;
-                slots.push(HostSlot {
-                    tex,
-                    mutex,
-                    shared,
-                    srv,
-                });
-            }
-            Ok(slots)
-        }
-    }
-
-    /// Open the IDD-push capturer. On success the caller's `keepalive` is attached (the capturer owns the
-    /// virtual display); on FAILURE the keepalive is handed BACK so the caller can fall back to DDA
-    /// instead of tearing the display down (audit §5.1 — no more 20 s black bail). "Failure" includes the
-    /// driver not attaching to the ring within a few seconds (e.g. a hybrid-GPU render mismatch).
-    #[allow(clippy::too_many_arguments)]
-    pub fn open(
-        target: WinCaptureTarget,
-        preferred: Option<(u32, u32, u32)>,
-        client_10bit: bool,
-        want_444: bool,
-        pyrowave: bool,
-        keepalive: Box<dyn Send>,
-        sender: crate::FrameChannelSender,
-        cursor_sender: Option<crate::CursorChannelSender>,
-        cursor_forward: Option<crate::CursorForwardSender>,
-    ) -> std::result::Result<Self, (anyhow::Error, Box<dyn Send>)> {
-        // The stall-attribution listener (idempotent): started with the first IDD-push capturer so
-        // the stall log can correlate DWM holes with OS display events for the session's lifetime.
-        pf_win_display::display_events::spawn_once();
-        match Self::open_inner(
-            target,
-            preferred,
-            client_10bit,
-            want_444,
-            pyrowave,
-            sender,
-            cursor_sender,
-            cursor_forward,
-        ) {
-            Ok(mut me) => {
-                me._keepalive = keepalive;
-                Ok(me)
-            }
-            Err(e) => Err((e, keepalive)),
-        }
-    }
-
-    #[allow(clippy::too_many_arguments)]
-    fn open_inner(
-        target: WinCaptureTarget,
-        preferred: Option<(u32, u32, u32)>,
-        client_10bit: bool,
-        want_444: bool,
-        pyrowave: bool,
-        sender: crate::FrameChannelSender,
-        cursor_sender: Option<crate::CursorChannelSender>,
-        cursor_forward: Option<crate::CursorForwardSender>,
-    ) -> Result<Self> {
-        // The ring MUST live on the adapter the driver's swap-chain renders on. Primary: the
-        // selected render GPU — the same pick SET_RENDER_ADAPTER pinned the driver to at monitor
-        // ADD, so on a healthy box they agree, and NVENC gets a device on a real GPU adapter.
-        // (`target.adapter_luid` is NOT that adapter: the ADD reply carries
-        // `IDARG_OUT_MONITORARRIVAL.OsAdapterLuid` = the IddCx DISPLAY adapter — verified
-        // on-glass; it stays a last-resort fallback for a pickerless box only.) When the pick and
-        // the driver HAVE drifted — identical twin GPUs whose max-VRAM tie moved between ADD and
-        // this open, or a stale kept monitor across an adapter re-init — the driver reports
-        // TEX_FAIL plus the adapter it actually renders on, and the rebind below reopens on that.
-        let luid = pf_gpu::resolve_render_adapter_luid().unwrap_or(LUID {
-            LowPart: (target.adapter_luid & 0xffff_ffff) as u32,
-            HighPart: (target.adapter_luid >> 32) as i32,
-        });
-        match Self::open_on(
-            target.clone(),
-            preferred,
-            client_10bit,
-            want_444,
-            pyrowave,
-            luid,
-            sender.clone(),
-            cursor_sender.clone(),
-            cursor_forward.clone(),
-        ) {
-            Ok(me) => Ok(me),
-            Err(e) => {
-                // Self-heal a render-adapter mismatch ONCE: on TEX_FAIL the driver has reported the
-                // adapter its swap-chain ACTUALLY renders on (a stale monitor across an adapter
-                // re-init, or a driver that ignored SET_RENDER_ADAPTER). Rebinding the ring to that
-                // adapter beats failing the session — the outer pipeline retries would repeat the
-                // exact same mismatch.
-                let driver_luid = e
-                    .downcast_ref::<AttachTexFail>()
-                    .map(|tf| tf.driver_luid)
-                    .filter(|d| *d != 0 && *d != crate::dxgi::pack_luid(luid));
-                let Some(packed) = driver_luid else {
-                    return Err(e);
-                };
-                let drv = LUID {
-                    LowPart: (packed & 0xffff_ffff) as u32,
-                    HighPart: (packed >> 32) as i32,
-                };
-                tracing::warn!(
-                    ring_adapter = format!("{:08x}:{:08x}", luid.HighPart, luid.LowPart),
-                    driver_adapter = format!("{:08x}:{:08x}", drv.HighPart, drv.LowPart),
-                    "IDD push: ring/driver render-adapter mismatch — rebinding the ring to the \
-                     driver's reported adapter"
-                );
-                Self::open_on(
-                    target,
-                    preferred,
-                    client_10bit,
-                    want_444,
-                    pyrowave,
-                    drv,
-                    sender,
-                    cursor_sender,
-                    cursor_forward,
-                )
-                .context("IDD-push rebind to the driver's reported render adapter")
-            }
-        }
-    }
-
-    #[allow(clippy::too_many_arguments)]
-    fn open_on(
-        target: WinCaptureTarget,
-        preferred: Option<(u32, u32, u32)>,
-        client_10bit: bool,
-        want_444: bool,
-        pyrowave: bool,
-        luid: LUID,
-        sender: crate::FrameChannelSender,
-        cursor_sender: Option<crate::CursorChannelSender>,
-        cursor_forward: Option<crate::CursorForwardSender>,
-    ) -> Result<Self> {
-        let (pw, ph, _hz) = preferred
-            .context("IDD push needs the negotiated mode (WxH) to size the shared ring")?;
-        // Size the ring to the display's ACTUAL current resolution if it differs from the negotiated mode:
-        // a fullscreen game can hold the virtual display at a different mode (esp. across a reconnect), so
-        // matching the actual mode lets the first frame flow instead of being dropped (game-capture bug
-        // GB1). Falls back to the negotiated mode when the CCD read is unavailable.
-        // SAFETY: `active_resolution` is an `unsafe fn` (Win32 CCD `QueryDisplayConfig`) that takes only a
-        // copy of the plain `u32` CCD target id and returns owned `(w, h)` values; it forms no borrows from
-        // us and validates the id internally, returning `None` on any failure (handled by `unwrap_or`).
-        let (w, h) = unsafe { pf_win_display::win_display::active_resolution(target.target_id) }
-            .unwrap_or((pw, ph));
-        if (w, h) != (pw, ph) {
-            tracing::info!(
-                target_id = target.target_id,
-                negotiated = format!("{pw}x{ph}"),
-                actual = format!("{w}x{h}"),
-                "IDD push: sizing the ring to the display's actual mode (differs from negotiated)"
-            );
-        }
-        // The driver composes the virtual display in FP16 (R16G16B16A16_FLOAT scRGB) when the display is
-        // in advanced-color (HDR) mode, and 8-bit BGRA otherwise (per swap_chain_processor.rs + the
-        // COMMIT_MODES2 colorspace/rgb_bpc log). For a 10-bit-capable client we PROACTIVELY enable
-        // advanced color so HDR streams without the user toggling anything, then TRACK the display's
-        // actual mode (a mid-session "Use HDR" flip; the driver's format-guard drops a mismatch), polling
-        // the live state here and on every recreate. An SDR-only client instead forces advanced color OFF
-        // and is PINNED there (below + the descriptor poller), so the SDR negotiation is honored and the
-        // encoder never emits the in-band PQ upgrade to a client that asked for SDR.
-        // SAFETY: one block over the whole ring setup; every operation in it is sound:
-        // - `set_advanced_color`/`advanced_color_enabled` are `unsafe fn`s taking only a copy of the plain
-        //   `u32` target id; they read/flip CCD display config and return owned values, borrowing nothing.
-        // - `CreateDXGIFactory1`, `EnumAdapterByLuid`, `make_device`, `SharedObjectSa::new`,
-        //   `CreateFileMappingW`, `MapViewOfFile`, `CreateEventW`, and `create_ring_slots` are all
-        //   `?`-checked, so every returned interface/handle/view is non-error before use;
-        //   `sa.as_ptr()`/`&adapter`/`&device` are live borrows that outlive each synchronous call, and
-        //   `sa.lpSecurityDescriptor` stays valid because the owning `SharedObjectSa` is held in scope
-        //   for the whole block (and frees the descriptor on the way out).
-        // - The header mapping is created AND viewed at `bytes == size_of::<SharedHeader>().max(64)`; the
-        //   view's null is checked (`bail!` on failure, after which the owned `map` closes the mapping). The
-        //   OS view base is page-aligned, so `section.ptr::<SharedHeader>()` is suitably aligned for a
-        //   `SharedHeader`, and `write_bytes(.., 0, bytes)` plus the `(*header).field = ..` writes all stay
-        //   within those `bytes` and write THROUGH the raw pointer without forming any `&mut`.
-        // - The `magic` publish stores through `addr_of!((*header).magic) as *const AtomicU32`: `addr_of!`
-        //   takes the field address without a reference; the field is a 4-aligned `u32` (valid for
-        //   `AtomicU32`), and the `Release` store after the `Release` fence is the cross-process handshake
-        //   that orders all preceding writes before the driver may observe `MAGIC`.
-        // - `broker.send` requires live `header`/`event` handles of this process: both borrow the just-
-        //   created owned section/event for the duration of that synchronous call.
-        // - `header` points into the OS mapping, NOT into the `MappedSection` struct, so moving `section`
-        //   into `me` leaves it valid (see the `MappedSection` doc comment).
-        unsafe {
-            // An SDR-NEGOTIATED session (either codec) must run on an SDR (BGRA) composition, so
-            // actively turn advanced color OFF — undoing any leftover HDR state from a prior 10-bit
-            // session on a reused/lingering monitor, the driver's default, or the host's global
-            // "Use HDR" — and settle before sizing the ring. Non-optional for two reasons:
-            //   - PyroWave: its CSC reads 8-bit BGRA and the NVIDIA D3D11 VideoProcessor can't ingest
-            //     the FP16 ring at all.
-            //   - H.26x: off an HDR composition the capturer emits P010 and the encoder stamps
-            //     Main10 + BT.2020 PQ from the pixel format alone (the in-band HDR upgrade), sending a
-            //     10-bit PQ stream to a client that advertised SDR-only ("HDR off = never send me
-            //     10-bit"). On a client whose monitor is HDR-capable but has "Use HDR" off, that PQ
-            //     lands on an SDR desktop and blows out — the composition must honor the negotiation.
-            // An HDR-negotiated (10-bit) session instead enables HDR below and rides the FP16 scRGB
-            // ring (design/pyrowave-444-hdr.md Phase 3 for PyroWave; the H.26x P010 path otherwise).
-            if !client_10bit {
-                let _ = pf_win_display::win_display::set_advanced_color(target.target_id, false);
-                let settle = Instant::now();
-                while settle.elapsed() < Duration::from_millis(250) {
-                    if pf_win_display::win_display::advanced_color_enabled(target.target_id)
-                        == Some(false)
-                    {
-                        break;
-                    }
-                    std::thread::sleep(Duration::from_millis(25));
-                }
-                if pf_win_display::win_display::advanced_color_enabled(target.target_id)
-                    == Some(true)
-                {
-                    tracing::error!(
-                        target = target.target_id,
-                        pyrowave,
-                        "IDD push: SDR session but advanced color (HDR) could NOT be turned off on the \
-                         virtual display (a physical display forcing HDR?) — PyroWave will likely fail \
-                         its first frame; H.26x would emit PQ the SDR-only client never asked for"
-                    );
-                } else {
-                    tracing::info!(
-                        target = target.target_id,
-                        pyrowave,
-                        settle_ms = settle.elapsed().as_millis() as u64,
-                        "IDD push: SDR-negotiated session — advanced color forced OFF (SDR/BGRA composition)"
-                    );
-                }
-            }
-            // If we ENABLE advanced color for a 10-bit client, trust it (the driver will compose FP16) and
-            // size the ring FP16 directly — don't race the advanced_color_enabled poll, which may not have
-            // settled within 250 ms and would size the ring SDR while the driver composes FP16 → a format
-            // mismatch → an immediate ring recreate + dropped first frames (audit §5.4).
-            let enabled_hdr = client_10bit
-                && pf_win_display::win_display::set_advanced_color(target.target_id, true);
-            if enabled_hdr {
-                // Let the colorspace change settle before the driver composes + we size the ring:
-                // poll the CCD advanced-color state instead of a fixed sleep (latency plan P0.4),
-                // ceiling = the old 250 ms. A read that never flips within the ceiling proceeds
-                // exactly like the fixed sleep did — the ring is sized FP16 from `enabled_hdr`
-                // either way (the set succeeded; only the driver's compose flip may lag, which the
-                // stash/format-guard machinery absorbs).
-                let hdr_settle = Instant::now();
-                while hdr_settle.elapsed() < Duration::from_millis(250) {
-                    if pf_win_display::win_display::advanced_color_enabled(target.target_id)
-                        == Some(true)
-                    {
-                        break;
-                    }
-                    std::thread::sleep(Duration::from_millis(25));
-                }
-                tracing::debug!(
-                    target_id = target.target_id,
-                    settle_ms = hdr_settle.elapsed().as_millis() as u64,
-                    "IDD push: advanced-color (HDR) enable settle"
-                );
-            }
-            // A failed open-time read defaults to SDR (unless the 10-bit path enabled HDR above) —
-            // there is no "last known" yet; the descriptor poller corrects a wrong guess mid-session.
-            // An SDR-negotiated session (either codec) forced advanced color OFF above and composes
-            // SDR unconditionally: `client_10bit` gates HDR so a client that advertised SDR-only is
-            // never handed a PQ stream, even if a physical display forces HDR on (the descriptor
-            // poller re-asserts OFF; PyroWave's format guard/stash absorbs any lingering FP16 compose).
-            // Keep the raw observation so Downgrade point D below can say whether the read reported
-            // OFF or failed outright — "we asked, it said no" and "we could not tell" have different
-            // causes and different fixes.
-            let observed_hdr =
-                pf_win_display::win_display::advanced_color_enabled(target.target_id);
-            let display_hdr = client_10bit && (enabled_hdr || observed_hdr.unwrap_or(false));
-            // Downgrade point D (design/hdr-10bit-default-and-av1.md item 2d): the session was
-            // NEGOTIATED 10-bit (the client was told HDR in the Welcome), but the virtual display
-            // could not enable advanced color — the ring sizes SDR and the encoder will emit 8-bit
-            // BT.709, so the client's label overstates the stream until the descriptor poller sees
-            // HDR come on. Loud, because every frame of this session is affected.
-            if client_10bit && !display_hdr {
-                tracing::error!(
-                    target = target.target_id,
-                    want_hdr = true,
-                    set_advanced_color_returned = enabled_hdr,
-                    observed_hdr = ?observed_hdr,
-                    "IDD push: 10-bit HDR was negotiated but enabling advanced color on the \
-                     virtual display FAILED — encoding 8-bit SDR while the client was told HDR \
-                     (check the display driver / Windows HDR support on this box). \
-                     observed_hdr=Some(false) ⇒ the display reports advanced colour OFF after the \
-                     set; None ⇒ the CCD read itself failed"
-                );
-            }
-            let ring_fmt = if display_hdr {
-                DXGI_FORMAT_R16G16B16A16_FLOAT
-            } else {
-                DXGI_FORMAT_B8G8R8A8_UNORM
-            };
-            // Our device (ring + zero-copy NVENC) lives on `luid` — the selected render GPU per
-            // `open_inner`; the driver must render the swap-chain on the SAME adapter for the
-            // shared textures to open (it reports its actual render LUID into the header, which
-            // `open_inner` uses to rebind once if this mismatches).
-            let factory: IDXGIFactory4 = CreateDXGIFactory1().context("CreateDXGIFactory1")?;
-            let adapter: IDXGIAdapter1 = factory
-                .EnumAdapterByLuid(luid)
-                .context("EnumAdapterByLuid(render adapter) for IDD push")?;
-            let (device, context) = make_device(&adapter).context("make_device for IDD push")?;
-
-            let sa = SharedObjectSa::new()?;
-            let bytes = std::mem::size_of::<SharedHeader>().max(64);
-
-            // Header — UNNAMED (the sealed channel: the driver gets a duplicated handle, not a name).
-            let map = CreateFileMappingW(
-                INVALID_HANDLE_VALUE,
-                Some(sa.as_ptr()),
-                PAGE_READWRITE,
-                0,
-                bytes as u32,
-                PCWSTR::null(),
-            )
-            .context("CreateFileMapping(IDD-push header)")?;
-            // Own the mapping handle so it (and its view) free via `MappedSection` RAII even on bail.
-            let map = OwnedHandle::from_raw_handle(map.0 as _);
-            let view = MapViewOfFile(
-                HANDLE(map.as_raw_handle()),
-                FILE_MAP_ALL_ACCESS,
-                0,
-                0,
-                bytes,
-            );
-            if view.Value.is_null() {
-                bail!("MapViewOfFile failed for IDD-push header"); // `map` drops → mapping closed
-            }
-            let section = MappedSection { handle: map, view };
-            let generation = next_generation();
-            let header = section.ptr::<SharedHeader>();
-            std::ptr::write_bytes(header.cast::<u8>(), 0, bytes);
-            (*header).version = VERSION;
-            (*header).generation = generation;
-            (*header).ring_len = RING_LEN;
-            (*header).width = w;
-            (*header).height = h;
-            // Ring format = the display's composition format (FP16 in HDR, BGRA in SDR). The driver
-            // reads this into its `ring_format` and drops any surface that doesn't match.
-            (*header).dxgi_format = ring_fmt.0 as u32;
-            // The ring NAMES its monitor (proto v3, `design/idd-push-security.md` invariant #10) —
-            // stamped before the magic (below), never changed for the ring's life (a mid-session
-            // recreate reuses this mapping). The driver refuses to attach a ring naming a different
-            // monitor, so a stash cross-wire fails closed instead of leaking frames cross-client
-            // (fail-closed refusal VALIDATED on-glass 2026-07-10 via a fault-injected build: driver
-            // DRV_STATUS_BIND_FAIL + loud host open failure + sibling stream undisturbed).
-            (*header).target_id = target.target_id;
-
-            // Frame-ready event (auto-reset) — UNNAMED, like everything on this channel.
-            let event = CreateEventW(Some(sa.as_ptr()), false, false, PCWSTR::null())
-                .context("CreateEvent(IDD-push)")?;
-            let event = OwnedHandle::from_raw_handle(event.0 as _);
-
-            // Ring of shared keyed-mutex textures, format matched to the display's current mode.
-            let slots = Self::create_ring_slots(&device, w, h, ring_fmt)?;
-
-            // Publish: magic LAST (Release) — the ring must be fully initialized before the driver
-            // (which receives the channel strictly afterwards) can observe MAGIC.
-            std::sync::atomic::fence(Ordering::Release);
-            (*(std::ptr::addr_of!((*header).magic) as *const AtomicU32))
-                .store(MAGIC, Ordering::Release);
-
-            // Deliver the sealed channel: duplicate header + event + every slot texture into the
-            // driver's WUDFHost and hand it the values over the control device. All-or-nothing (the
-            // broker reaps its remote duplicates on failure), and a failure fails the open — without
-            // the delivery the driver can never attach.
-            let broker = ChannelBroker::open(target.wudf_pid, sender)?;
-            broker
-                .send(
-                    target.target_id,
-                    generation,
-                    HANDLE(section.handle.as_raw_handle()),
-                    HANDLE(event.as_raw_handle()),
-                    &slots,
-                )
-                .context("deliver IDD-push frame channel to the driver")?;
-
-            // v5 hardware-cursor channel (M2c): create + deliver the CursorShm section. Failure
-            // is NON-fatal — the driver never declares the hardware cursor without this delivery,
-            // so the session degrades to today's composited pointer (and the forwarder simply
-            // never sees a live overlay).
-            let cursor_shared = cursor_sender.as_ref().and_then(|send_cursor| {
-                match cursor::CursorShared::create(target.target_id) {
-                    Ok(cs) => {
-                        // Deliver via the shared helper (also used for RE-delivery after a
-                        // driver-side monitor re-arrival destroyed the worker).
-                        deliver_cursor_channel(&broker, target.target_id, &cs, send_cursor)
-                            .then_some(cs)
-                    }
-                    Err(e) => {
-                        tracing::warn!(
-                            "cursor section creation failed — the driver will not declare a \
-                             hardware cursor, so this session cannot forward the pointer: {e:#}"
-                        );
-                        None
-                    }
-                }
-            });
-            // No LIVE channel this session, but the target's sticky declare (an EARLIER session's —
-            // irrevocable, §8.6) keeps DWM's frames pointer-free with no client drawing either:
-            // the only visible pointer is the one composited here, so force composite mode on.
-            //
-            // Gated on `cursor_shared`, NOT on `cursor_sender`. §8.6's rationale is "this session has
-            // no cursor CHANNEL", and the delivery just above is explicitly allowed to fail
-            // non-fatally — which is precisely the state that needs this rescue, yet the
-            // `cursor_sender.is_none()` test was the one state that skipped it: the host negotiated a
-            // channel, failed to create or deliver it, and then declined to composite, leaving a
-            // cursor-excluded target with NO pointer at all.
-            let composite_forced = target.cursor_excluded && cursor_shared.is_none();
-            if composite_forced {
-                tracing::info!(
-                    target_id = target.target_id,
-                    negotiated_channel = cursor_sender.is_some(),
-                    "target carries an irrevocable hardware-cursor declare from an earlier \
-                     desktop-mode session and this session has no LIVE cursor channel — the host \
-                     composites the pointer into frames (forced, for the session's life). \
-                     negotiated_channel=true ⇒ one was negotiated but its creation/delivery failed"
-                );
-            }
-            // The GDI shape poller rides the SAME gate as the delivered channel: with the driver's
-            // hardware cursor keeping the frame cursor-free, the poller supplies the full-fidelity
-            // shape (masked/monochrome included — the IddCx query can't; see cursor_poll.rs).
-            // Forced-composite sessions need it too — it is their only shape/position source.
-            let cursor_poll = (cursor_shared.is_some() || composite_forced).then(|| {
-                // Safety of the CCD call: read-only QueryDisplayConfig over owned locals (same
-                // call CursorShared::create makes) — already inside open_on's unsafe region.
-                let rect = pf_win_display::win_display::source_desktop_rect(target.target_id)
-                    .unwrap_or((0, 0, i32::MAX, i32::MAX));
-                cursor_poll::CursorPoller::spawn(target.target_id, rect)
-            });
-            // Heal the driver's persisted cursor-forward state: a session that died on the
-            // secure desktop (client drops at the lock screen — the common case) leaves the
-            // per-target desired state `false`, and the NEXT session's channel delivery would
-            // adopt UNdeclared (the exact cross-session composite trap of §8.6). A fresh
-            // session always starts declared; the secure-desktop guard re-disables if the
-            // secure desktop is (still) up, via its first `poll_secure_desktop` edge.
-            if let (Some(_), Some(fwd)) = (cursor_shared.as_ref(), cursor_forward.as_ref()) {
-                if let Err(e) = fwd(true) {
-                    tracing::debug!("cursor-forward reset at open failed (pre-v6 driver?): {e:#}");
-                }
-            }
-
-            tracing::info!(
-                target_id = target.target_id,
-                wudf_pid = target.wudf_pid,
-                render_luid = format!("{:08x}:{:08x}", luid.HighPart, luid.LowPart),
-                mode = format!("{w}x{h}"),
-                display_hdr,
-                client_10bit,
-                want_444,
-                ring_fp16 = display_hdr,
-                // Whether DXGI ever reached the win32u GPU-preference hook. By this point the
-                // factory + `EnumAdapterByLuid` + `make_device` above have exercised DXGI, so a
-                // 0 here means the hook is inert on this build — the first thing to check if a
-                // hybrid-GPU box keeps reporting TEX_FAIL render-adapter mismatches
-                // (`dxgi::install_gpu_pref_hook`).
-                hybrid_hook_hits = crate::dxgi::hybrid_hook_hits(),
-                "IDD push(host): created sealed ring + delivered the channel; waiting for the driver \
-                 to attach + publish"
-            );
-            let mut me = Self {
-                device,
-                context,
-                target_id: target.target_id,
-                section,
-                header,
-                event,
-                broker,
-                width: w,
-                height: h,
-                slots,
-                generation,
-                client_10bit,
-                display_hdr,
-                hdr_pin_warned: false,
-                want_444,
-                pyrowave,
-                pyro_fence: None,
-                pyro_fence_handle: None,
-                pyro_fence_value: 0,
-                pyro_ring: Vec::new(),
-                pyro_conv: None,
-                pyro_last: None,
-                desc_poller: DescriptorPoller::spawn(
-                    target.target_id,
-                    DisplayDescriptor {
-                        hdr: display_hdr,
-                        width: w,
-                        height: h,
-                    },
-                ),
-                desc_seq: 0,
-                pending_desc: None,
-                recovering_since: None,
-                last_fresh: Instant::now(),
-                last_liveness: Instant::now(),
-                last_kick: Instant::now(),
-                stall_watch: StallWatch::new(),
-                out_ring: Vec::new(),
-                out_idx: 0,
-                video_conv: None,
-                hdr_p010_conv: None,
-                last_seq: 0,
-                last_present: None,
-                status_logged: false,
-                cursor_shared,
-                cursor_poll,
-                cursor_sender,
-                cursor_forward,
-                secure_active: false,
-                composite_cursor: composite_forced,
-                composite_forced,
-                cursor_blend: None,
-                cursor_blend_failed: false,
-                cursor_shm_latched: false,
-                blend_scratch: None,
-                last_blend_key: None,
-                last_slot: None,
-                sdr_white_scale: 1.0,
-                // Held from BEFORE the first-frame gate (the display must not idle off while we
-                // wait for the first compose) until the capturer drops with the session.
-                _display_wake: pf_frame::session_tuning::DisplayWakeRequest::new(),
-                // Placeholder; `open()` attaches the real keepalive on success, so a FAILED open can hand
-                // it back to the caller for the DDA fallback (audit §5.1).
-                _keepalive: Box::new(()),
-            };
-            // The HDR SDR-white reference for the composited cursor, queried ONCE here rather than
-            // from the blend (which holds the ring slot's keyed mutex — see
-            // `refresh_sdr_white_scale`). No-op on an SDR composition.
-            me.refresh_sdr_white_scale();
-            // Bounded wait for the driver to ATTACH to the ring AND publish a first frame. An attach
-            // failure (DRV_STATUS_TEX_FAIL) or an attach-but-no-frames (a game left the display in a
-            // format/size the ring can't match) becomes an open failure the caller falls back from (→ DDA),
-            // instead of next_frame's 20 s black-then-bail.
-            me.wait_for_attach()?;
-            Ok(me)
-        }
-    }
-
-    /// Block (bounded) until the driver has ATTACHED to the host ring (`DRV_STATUS_OPENED`) **and published
-    /// a first frame**, else fail so the caller can fall back to DDA (audit §5.1 +
-    /// `design/windows-host-rewrite.md` §2.5 — the GB1 game-capture fix).
-    ///
-    /// Requiring the first frame — not just the attach — catches the *reconnect-into-a-broken-state* case:
-    /// a fullscreen game can leave the virtual display in a format/size that the driver's `publish()` guard
-    /// rejects, so the driver ATTACHES but silently drops every frame; without this the host sails past
-    /// `open()` and only dies on `next_frame`'s 20 s deadline (the "reconnect = black + audio" symptom).
-    /// A stash-capable driver republishes its retained desktop frame the moment it attaches (the
-    /// first-frame guarantee — `FrameStash`, driver frame_transport.rs), so the normal case clears this
-    /// gate in milliseconds even on an idle desktop; failing that, at session open the OS activates the
-    /// virtual display → DWM composites it → a frame arrives within ~1 s, plus the compose-kick fallback
-    /// below — no frame within the window = genuinely broken.
-    fn wait_for_attach(&self) -> Result<()> {
-        // Symmetric host-side binding sanity (proto v3 §3.2): OUR header must still name OUR
-        // monitor. The stamp is ours and nothing legitimate rewrites it, so a mismatch means a
-        // host-side bug (a stash/capturer cross-wire) — the exact class the driver-side check
-        // catches from the other end; failing here names the culprit in the same release.
-        // SAFETY: in-bounds, aligned u32 read of the live, owned shared-header mapping (same access
-        // pattern as the `driver_status` read below); no reference into the shared region is formed.
-        let stamped = unsafe { (*self.header).target_id };
-        if stamped != self.target_id {
-            bail!(
-                "IDD-push: our ring header names target {stamped} but this capturer serves target \
-                 {} — host-side ring↔monitor cross-wire (bug); failing the open",
-                self.target_id
-            );
-        }
-        let deadline = Instant::now() + Duration::from_secs(4);
-        // First-frame expectation: a stash-capable driver republishes its retained desktop frame
-        // the moment it attaches (`FrameStash`, frame_transport.rs), so on a healthy pairing the
-        // gate below clears in milliseconds even on a perfectly idle desktop. The compose-kick
-        // schedule is the FALLBACK for pre-stash drivers / an empty stash (a display that has
-        // never composed): DWM only presents a display something DIRTIED, so on an idle desktop
-        // an attach would otherwise sit at E_PENDING forever and fail this gate — the
-        // "idle desktop → no frames" gotcha. Give the natural post-activate compose (and the
-        // stash republish) a moment, then nudge; log when we do, so field logs show whether the
-        // stash path is working.
-        let mut next_kick = Instant::now() + Duration::from_millis(600);
-        loop {
-            // SAFETY: `self.header` points into the live shared-header mapping this capturer owns (sized
-            // `>= size_of::<SharedHeader>()`, page-aligned), so the field read is in-bounds + aligned, and
-            // no reference into the shared region is formed. Plain read: the driver writes this `u32`
-            // cross-process, but an aligned `u32` read can't tear and `driver_status` is best-effort
-            // diagnostics — the real handshake is the atomic `magic`/`latest` (same access as
-            // log_driver_status_once).
-            let st = unsafe { (*self.header).driver_status };
-            if st == DRV_STATUS_TEX_FAIL {
-                // The driver wrote its render LUID BEFORE attempting the texture opens
-                // (frame_transport.rs step 2), so it is valid here.
-                let (_, detail, lo, hi) = self.driver_diag();
-                // Typed so `open_inner` can rebind the ring to the driver's adapter once.
-                return Err(anyhow::Error::new(AttachTexFail {
-                    detail,
-                    driver_luid: ((hi as i64) << 32) | (lo as i64 & 0xffff_ffff),
-                }));
-            }
-            if st == DRV_STATUS_NO_DEVICE1 {
-                // SAFETY: as above — an in-bounds, aligned `u32` read of a best-effort diagnostic field
-                // through the owned, live header mapping; no reference into the shared region is formed.
-                let detail = unsafe { (*self.header).driver_status_detail };
-                bail!(
-                    "IDD-push driver failed to attach (driver_status={st} detail=0x{detail:08x} — \
-                     the driver has no ID3D11Device1 to open shared resources)"
-                );
-            }
-            if st == DRV_STATUS_BIND_FAIL {
-                // SAFETY: as above — an in-bounds, aligned `u32` read of a best-effort diagnostic field
-                // through the owned, live header mapping; no reference into the shared region is formed.
-                let claimed = unsafe { (*self.header).driver_status_detail };
-                bail!(
-                    "IDD-push driver REFUSED the ring↔monitor binding (DRV_STATUS_BIND_FAIL: the \
-                     delivered ring names target {claimed}, the monitor is {}) — host \
-                     stash/delivery cross-wire (bug); failing the open loudly (proto v3 §3.2)",
-                    self.target_id
-                );
-            }
-            // Attached AND a frame has been published — the publish token's seq advances past 0.
-            if st == DRV_STATUS_OPENED && frame::FrameToken::unpack(self.latest()).seq != 0 {
-                return Ok(());
-            }
-            if Instant::now() >= next_kick {
-                // Reaching a kick at all means the driver did NOT republish a retained frame
-                // (pre-stash driver, or a never-composed display) — worth a line in the field log.
-                tracing::debug!(
-                    target_id = self.target_id,
-                    driver_status = st,
-                    "IDD push: no first frame after attach delivery — falling back to a synthetic \
-                     compose kick (stash-capable drivers republish instantly; old driver?)"
-                );
-                // May BLOCK this thread ~35 ms (the cursor-on-a-sibling-display branch — see
-                // `kick_dwm_compose`'s COST note). Fine here: we are inside the open-time
-                // first-frame gate, so no frames are flowing yet.
-                kick_dwm_compose(self.target_id);
-                next_kick = Instant::now() + Duration::from_millis(800);
-            }
-            if Instant::now() > deadline {
-                bail!(
-                    "IDD-push: no frame published within 4s (despite compose kicks) — {}; \
-                     falling back",
-                    self.no_first_frame_diagnosis(st)
-                );
-            }
-            // Event-driven wait (latency plan P0.6): the driver signals the frame-ready event on
-            // every publish, so wake on it instead of a blind sleep — the 20 ms timeout keeps the
-            // driver_status polls above live (status writes don't signal the event). Consuming a
-            // signal here is fine: `next_frame` re-checks the atomic `latest` token, never the
-            // event, for truth.
-            // SAFETY: `self.event` is this capturer's owned, live auto-reset event handle;
-            // `WaitForSingleObject` only reads the handle and the 20 ms timeout bounds the wait.
-            let _ = unsafe { WaitForSingleObject(HANDLE(self.event.as_raw_handle()), 20) };
-        }
-    }
-
-    /// Name a first-frame timeout from the driver's own evidence — `driver_status` plus the live
-    /// OPENED detail word (proto `pack_opened_detail`) — instead of guessing. The three no-frames
-    /// states look identical from the host side but have disjoint causes and fixes; the lid-closed
-    /// field report burned days for lack of exactly this line. Appends a console-session hint when
-    /// the host itself is in the wrong session (display writes + input kicks can't work from there).
-    fn no_first_frame_diagnosis(&self, st: u32) -> String {
-        let what = match st {
-            // The delivery was never consumed: no swap-chain worker ran for this monitor at all.
-            DRV_STATUS_NONE => "the driver never attached — the channel delivery was never \
-                 consumed, so the OS ran no swap-chain worker for this monitor (display not \
-                 composed at all: console display-off / modern standby, or the mode commit \
-                 never reached the adapter)"
-                .to_string(),
-            DRV_STATUS_OPENED => {
-                // SAFETY: in-bounds, aligned u32 read of the live, owned shared-header mapping
-                // (same best-effort diagnostic access as the `driver_status` read in the caller);
-                // no reference into the shared region is formed.
-                let detail = unsafe { (*self.header).driver_status_detail };
-                match unpack_opened_detail(detail) {
-                    Some((0, _)) => "driver attached with a live swap-chain, but DWM composed \
-                         ZERO frames — an undamaged or powered-off desktop, and the compose \
-                         kicks didn't bite (synthetic input is blocked on the secure desktop)"
-                        .to_string(),
-                    Some((offered, mismatched)) => format!(
-                        "driver attached and DWM composed {offered} frame(s), but none matched \
-                         the ring — {mismatched} dropped for a size/format mismatch (the \
-                         display's actual mode differs from what the host sized the ring to: \
-                         a mid-open mode-set, a fullscreen game, or a stale GDI view)"
-                    ),
-                    // A pre-detail driver never stamps the live bit — say so rather than guess.
-                    None => "driver attached but published nothing; this pf-vdisplay build \
-                         predates attach diagnostics, so the cause can't be named — update the \
-                         driver for a precise line here"
-                        .to_string(),
-                }
-            }
-            other => format!("driver_status={other} (unexpected at this point)"),
-        };
-        match pf_win_display::console_session_mismatch() {
-            Some((own, console)) => format!(
-                "{what} [host is in session {own} but the console is session {console} — display \
-                 writes and input kicks cannot work from a non-console session; reconnect the \
-                 console or run via the installed service]"
-            ),
-            None => what,
-        }
-    }
-}
-
-/// `wait_for_attach`'s DRV_STATUS_TEX_FAIL as a typed error: the driver could not open the ring
-/// textures, and `driver_luid` (packed, from the shared header) is the adapter its swap-chain
-/// ACTUALLY renders on — `open_inner` downcasts to this to rebind the ring there once.
-#[derive(Debug)]
-struct AttachTexFail {
-    detail: u32,
-    driver_luid: i64,
-}
-
-impl std::fmt::Display for AttachTexFail {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(
-            f,
-            "IDD-push driver failed to attach (driver_status={DRV_STATUS_TEX_FAIL} \
-             detail=0x{:08x}): it could not open the ring textures — its swap-chain renders on \
-             adapter {:08x}:{:08x}, not the ring's (render-adapter mismatch)",
-            self.detail,
-            (self.driver_luid >> 32) as i32,
-            (self.driver_luid & 0xffff_ffff) as u32,
-        )
-    }
-}
-
-impl std::error::Error for AttachTexFail {}
@@ -31,10 +31,6 @@ pub(super) struct StallWatch {
    /// The last [`Self::RECENT`] fresh-frame instants (pre-gap history for the activity gate).
    recent: std::collections::VecDeque<Instant>,
    cadence: pf_frame::metronome::Metronome,
-    /// Stalls seen this session, and how many had a coinciding OS display event — the discriminator
-    /// [`Self::report`] uses. They were capturer fields that nothing outside the report touched.
-    seen: u32,
-    with_os_events: u32,
 }

 impl StallWatch {
@@ -52,8 +48,6 @@ impl StallWatch {
        Self {
            recent: std::collections::VecDeque::with_capacity(Self::RECENT + 1),
            cadence: pf_frame::metronome::Metronome::new(),
-            seen: 0,
-            with_os_events: 0,
        }
    }

@@ -85,81 +79,4 @@ impl StallWatch {
            metronomic: self.cadence.note(now),
        })
    }
-    /// Log a detected stall, correlate it against OS display events, and — once the cadence turns
-    /// metronomic — name the class of disturbance and its cures.
-    ///
-    /// Lives here rather than in `try_consume` (sweep Phase 5.4): it is ~65 lines of log prose plus
-    /// a running tally, all of it about stalls and none of it about consuming a frame, in a function
-    /// that runs per frame. `now` is the instant of the frame that ENDED the stall — the same one
-    /// passed to [`Self::note_fresh`] — which is what bounds the event-correlation window.
-    pub(super) fn report(&mut self, stall: &Stall, now: Instant) {
-        // OS display events inside the gap (plus a lead-in margin: the event that CAUSED the
-        // hole lands just before DWM stops delivering) — the attribution that turns "DWM
-        // stopped composing" into "…because Windows re-enumerated SAMSUNG on HDMI".
-        let window = stall.gap + Duration::from_millis(300);
-        let events = now
-            .checked_sub(window)
-            .map(|from| pf_win_display::display_events::events_between(from, now))
-            .unwrap_or_default();
-        self.seen = self.seen.saturating_add(1);
-        if !events.is_empty() {
-            self.with_os_events = self.with_os_events.saturating_add(1);
-        }
-        // debug (not warn): a single hole also happens when content legitimately pauses;
-        // the reportable signal is the metronomic cycle below. Mounjay-class triage runs
-        // at debug level, and the web-console debug ring captures these.
-        tracing::debug!(
-            gap_ms = stall.gap.as_millis() as u64,
-            os_display_events = %pf_win_display::display_events::summarize(&events),
-            "IDD-push capture stall — the desktop was composing at speed, then DWM \
-             delivered no frame for the gap; the present path stalled below capture"
-        );
-        if let Some(period) = stall.metronomic {
-            let suspects = pf_win_display::display_events::connected_inactive_physicals();
-            let suspects = if suspects.is_empty() {
-                "none".to_string()
-            } else {
-                suspects.join(", ")
-            };
-            let correlated = format!("{}/{}", self.with_os_events, self.seen);
-            // Half-or-more of the stalls carrying a coinciding OS event = the reaction
-            // cascade is OS-visible; otherwise the disturbance never surfaces above the
-            // driver. Different classes, different cures — say which one this box has.
-            if self.with_os_events * 2 >= self.seen {
-                tracing::warn!(
-                    period_s = format!("{:.2}", period.as_secs_f64()),
-                    os_correlated = correlated,
-                    connected_inactive = %suspects,
-                    "capture stalls are METRONOMIC and coincide with Windows monitor \
-                     hot-plug/re-enumeration events — a connected display (or its \
-                     cable/switch/AVR) re-probes the link on a timer and Windows re-reacts \
-                     each time. Cures, best-first: that display's OSD 'auto input \
-                     scan/detect' OFF (and on TVs: instant-on/quick-start + CEC off), \
-                     unplug its cable at the GPU, an HPD-holding adapter/dummy plug, or \
-                     keep it active while streaming; the pnp_disable_monitors policy axis \
-                     suppresses the Windows-side reaction (see connected_inactive for the \
-                     suspects)"
-                );
-            } else {
-                tracing::warn!(
-                    period_s = format!("{:.2}", period.as_secs_f64()),
-                    os_correlated = correlated,
-                    connected_inactive = %suspects,
-                    "capture stalls are METRONOMIC with NO coinciding OS display event — \
-                     the disturbance is BELOW Windows: the GPU driver servicing a \
-                     connected-but-asleep sink (standby HPD/DDC/link probing), \
-                     display-poller software (the SteelSeries-GG/SignalRGB class — \
-                     correlate 'slow display-descriptor poll' lines), or the DWM present \
-                     clock (try a different refresh rate). If connected_inactive lists a \
-                     display, its standby servicing is the prime suspect. For a LAPTOP \
-                     PANEL (the exclusive isolate deactivated it — the dark-but-connected \
-                     head is itself the disturbance on hybrid laptops): keep it active \
-                     with `topology: primary`, or try the `pnp_disable_monitors` axis. \
-                     For an external display: unplug it at the GPU, disable its OSD auto \
-                     input scan (TVs: instant-on/quick-start + CEC off), use an \
-                     HPD-holding adapter/dummy, or keep it active while streaming"
-                );
-            }
-        }
-    }
 }
@@ -140,17 +140,13 @@ impl Capturer for SyntheticNv12Capturer {
 /// # Safety
 /// Calls DXGI factory/adapter enumeration; returns owned COM objects or an error.
 unsafe fn resolve_render_adapter() -> Result<IDXGIAdapter1> {
-    // SAFETY: three `?`/`Ok`-checked DXGI enumeration calls over owned locals — the factory is
-    // created here and the adapters it returns own their own COM references. No raw pointers.
-    unsafe {
-        let factory: IDXGIFactory4 = CreateDXGIFactory1().context("CreateDXGIFactory1")?;
-        if let Some(luid) = pf_gpu::resolve_render_adapter_luid() {
-            if let Ok(a) = factory.EnumAdapterByLuid::<IDXGIAdapter1>(luid) {
-                return Ok(a);
-            }
+    let factory: IDXGIFactory4 = CreateDXGIFactory1().context("CreateDXGIFactory1")?;
+    if let Some(luid) = pf_gpu::resolve_render_adapter_luid() {
+        if let Ok(a) = factory.EnumAdapterByLuid::<IDXGIAdapter1>(luid) {
+            return Ok(a);
        }
-        factory.EnumAdapters1(0).context("EnumAdapters1(0)")
    }
+    factory.EnumAdapters1(0).context("EnumAdapters1(0)")
 }

 /// Create an NV12 `Texture2D` with the given usage/CPU-access/bind flags.
@@ -181,12 +177,8 @@ unsafe fn create_nv12(
        ..Default::default()
    };
    let mut tex: Option<ID3D11Texture2D> = None;
-    // SAFETY: one `?`-checked `CreateTexture2D` on the live `device` borrow (per the contract
-    // above), with a fully-initialized stack descriptor and a live `Option` out-param.
-    unsafe {
-        device
-            .CreateTexture2D(&desc, None, Some(&mut tex))
-            .context("CreateTexture2D(NV12)")?;
-    }
+    device
+        .CreateTexture2D(&desc, None, Some(&mut tex))
+        .context("CreateTexture2D(NV12)")?;
    tex.context("CreateTexture2D returned a null NV12 texture")
 }
@@ -299,23 +299,6 @@ fn pref_for_type(t: sdl3::gamepad::GamepadType) -> GamepadPref {
    }
 }

-/// The kind a slot DECLARES to the host ([`InputKind::GamepadArrival`]) given the user's
-/// controller-type `setting` and the pad's `physical` kind: an explicit setting emulates that pad
-/// for every slot, `Auto` keeps per-pad detection (what makes a mixed session honest).
-///
-/// This has to be applied per pad and not just in the Hello: the host builds each virtual device
-/// from that pad's arrival and only falls back to the session default for a pad that never
-/// declares one, so a client that always declared the detected kind would silently undo the
-/// setting the moment a controller connected. The physical kind is still what the LOCAL feedback
-/// paths use (DualSense raw effects, the Deck rumble keep-alive) — those talk to the controller in
-/// the user's hands, not the one the host is pretending to have.
-fn declared_kind(setting: GamepadPref, physical: GamepadPref) -> GamepadPref {
-    match setting {
-        GamepadPref::Auto => physical,
-        explicit => explicit,
-    }
-}
-
 /// Best-effort "this machine is a Steam Deck". The Gaming-Mode env short-circuits; desktop
 /// mode falls back to DMI (Valve board, Jupiter = LCD / Galileo = OLED — readable inside the
 /// flatpak sandbox). Cached: the answer can't change while we run.
@@ -335,7 +318,6 @@ enum Ctl {
    Attach(Arc<NativeClient>),
    Detach,
    Pin(Option<String>),
-    KindOverride(GamepadPref),
    MenuMode(bool),
    MenuRumble(MenuPulse),
 }
@@ -470,18 +452,6 @@ impl GamepadService {
        let _ = self.ctl.send(Ctl::Pin(key));
    }

-    /// Adopt the user's explicit controller-type setting for the session about to start
-    /// (`GamepadPref::Auto` = detect per pad, the default).
-    ///
-    /// This is NOT redundant with the session default in the Hello: a current host honors a pad's
-    /// [`InputKind::GamepadArrival`] over the session default, so a client that declared only the
-    /// detected kind would silently undo the setting the moment a controller connected. Call it
-    /// before [`Self::attach`] — slots declare their kind at open time and the host does not
-    /// hot-swap a device that already exists.
-    pub fn set_kind_override(&self, pref: GamepadPref) {
-        let _ = self.ctl.send(Ctl::KindOverride(pref));
-    }
-
    pub fn attach(&self, connector: Arc<NativeClient>) {
        let _ = self.ctl.send(Ctl::Attach(connector));
    }
@@ -721,10 +691,6 @@ struct Worker {
    /// connected pads, so it survives restarts and disconnects. A pin forwards ONLY that pad
    /// (an explicit single-player choice); Automatic forwards every real controller.
    pinned: Option<String>,
-    /// The user's explicit "controller type" setting ([`GamepadService::set_kind_override`]);
-    /// `Auto` = per-pad detection. Applied at slot open to the kind DECLARED to the host, never
-    /// to [`Slot::pref`] — the local feedback paths must keep reading the physical pad.
-    kind_override: GamepadPref,
    attached: Option<Arc<NativeClient>>,
    /// Raises the UI escape signal; the escape chord fires it once per press.
    escape_tx: async_channel::Sender<()>,
@@ -910,17 +876,10 @@ impl Worker {
            );
            return;
        };
-        let pref = match self.pad_info(id) {
-            // Steam Input's virtual pad standing in front of the Deck's built-in controls (the
-            // only-pad-forwarded case, [`Self::forwarded_ids`]): declare the DECK kind, not the
-            // wrapper's Xbox 360 identity. [`Self::auto_pref`] already resolves the SESSION
-            // default this way, but a current host honors the per-pad arrival over the session
-            // default — so without this the host builds an X-Box 360 pad on a real Deck.
-            Some(p) if p.steam_virtual && is_steam_deck() => GamepadPref::SteamDeck,
-            Some(p) => p.pref,
-            None => GamepadPref::Xbox360,
-        };
-        let declared = declared_kind(self.kind_override, pref);
+        let pref = self
+            .pad_info(id)
+            .map(|p| p.pref)
+            .unwrap_or(GamepadPref::Xbox360);
        match self.subsystem.open(sdl3::sys::joystick::SDL_JoystickID(id)) {
            Ok(pad) => {
                let mut slot = Slot::new(id, index, pref, pad);
@@ -930,13 +889,7 @@ impl Worker {
                // re-sends it a few times against datagram loss; an older host ignores it and
                // uses the session-default kind.
                if let Some(c) = &self.attached {
-                    send(
-                        c,
-                        InputKind::GamepadArrival,
-                        declared.to_u8() as u32,
-                        0,
-                        index,
-                    );
+                    send(c, InputKind::GamepadArrival, pref.to_u8() as u32, 0, index);
                    // Declare the actuator's quirks to the shared rumble policy engine. ALWAYS
                    // set (defaults for a well-behaved pad): wire indices are reused within a
                    // connection, so a Deck slot that closes must not leave its keepalive quirk
@@ -952,13 +905,7 @@ impl Worker {
                    };
                    c.set_rumble_quirks(index as u16, quirks);
                }
-                tracing::info!(
-                    id,
-                    index,
-                    pref = ?pref,
-                    declared = ?declared,
-                    "gamepad forwarding (slot opened)"
-                );
+                tracing::info!(id, index, pref = ?pref, "gamepad forwarding (slot opened)");
                self.slots.push(slot);
            }
            Err(e) => tracing::warn!(id, error = %e, "gamepad open failed"),
@@ -1266,7 +1213,6 @@ impl Worker {
                    self.pinned = key;
                    self.refresh_active();
                }
-                Ok(Ctl::KindOverride(pref)) => self.kind_override = pref,
                Ok(Ctl::MenuMode(on)) => {
                    self.menu_mode = on;
                    if on {
@@ -1606,7 +1552,6 @@ impl Worker {
            menu_open: None,
            order: Vec::new(),
            pinned: None,
-            kind_override: GamepadPref::Auto,
            attached: None,
            escape_tx,
            disconnect_tx,
@@ -1872,38 +1817,6 @@ mod slot_tests {
        assert_eq!(lowest_free_index(&but_seven), Some(7));
    }

-    #[test]
-    fn an_explicit_setting_is_what_every_pad_declares() {
-        // The regression this pins: the setting used to reach the Hello only, and each pad's
-        // arrival then re-declared the DETECTED kind — which the host honors over the session
-        // default, so "emulate my DualSense as a DualShock 4" produced a DualSense.
-        assert_eq!(
-            declared_kind(GamepadPref::DualShock4, GamepadPref::DualSense),
-            GamepadPref::DualShock4
-        );
-        // Every physical pad in a mixed session follows the one explicit choice.
-        for physical in [
-            GamepadPref::DualSense,
-            GamepadPref::Xbox360,
-            GamepadPref::SwitchPro,
-            GamepadPref::SteamDeck,
-        ] {
-            assert_eq!(
-                declared_kind(GamepadPref::Xbox360, physical),
-                GamepadPref::Xbox360
-            );
-        }
-        // Automatic keeps per-pad detection — otherwise a mixed session collapses to one type.
-        assert_eq!(
-            declared_kind(GamepadPref::Auto, GamepadPref::DualSense),
-            GamepadPref::DualSense
-        );
-        assert_eq!(
-            declared_kind(GamepadPref::Auto, GamepadPref::SteamDeck),
-            GamepadPref::SteamDeck
-        );
-    }
-
    #[test]
    fn hidout_pad_reads_every_variant() {
        assert_eq!(
@@ -62,10 +62,6 @@ pub struct GameEntry {
    pub title: String,
    #[serde(default)]
    pub art: Artwork,
-    /// The system the title runs on (`"PC"`, `"PS2"`, …) — free-form display string from the
-    /// host's flattened `GameMeta`; the rest of the metadata is not decoded until a UI needs it.
-    #[serde(default)]
-    pub platform: Option<String>,
 }

 /// Errors surfaced to the UI so it can guide setup (the common case is "not paired yet").
@@ -284,7 +280,7 @@ mod tests {
    fn game_entry_decodes_the_wire_shape() {
        // The exact shape mgmt.rs serializes (optional art fields omitted, launch ignored).
        let json = r#"[
-            {"id":"steam:570","store":"steam","title":"Dota 2","platform":"PC",
+            {"id":"steam:570","store":"steam","title":"Dota 2",
             "art":{"portrait":"/api/v1/library/art/steam:570/portrait"},
             "launch":{"kind":"steam_appid","value":"570"}},
            {"id":"custom:abc","store":"custom","title":"My Emu","art":{}}
@@ -292,12 +288,7 @@ mod tests {
        let games: Vec<GameEntry> = serde_json::from_str(json).unwrap();
        assert_eq!(games.len(), 2);
        assert_eq!(games[0].id, "steam:570");
-        assert_eq!(games[0].platform.as_deref(), Some("PC"));
        assert!(games[1].art.portrait.is_none());
-        assert!(
-            games[1].platform.is_none(),
-            "pre-metadata hosts still parse"
-        );
    }

    #[test]
@@ -44,13 +44,6 @@ pub struct SessionParams {
    /// Share the clipboard with this host (the per-host `KnownHost::clipboard_sync`). The
    /// bridge additionally needs the host to advertise `HOST_CAP_CLIPBOARD`.
    pub clipboard: bool,
-    /// Advertise `quic::CLIENT_CAP_CURSOR`: this embedder renders the host cursor locally
-    /// (the presenter's cursor channel, design/remote-desktop-sweep.md M2), so the host may
-    /// stop compositing the pointer into the video. Only set when the embedder actually
-    /// draws it (the SDL presenter in desktop mouse mode) — a session that advertises it
-    /// without rendering streams with NO visible cursor. The host answers `HOST_CAP_CURSOR`
-    /// when its capture can forward (Linux portal, not gamescope/Windows).
-    pub cursor_forward: bool,
    /// Video decoder preference (Settings; `PUNKTFUNK_DECODER` overrides — see
    /// `video::Decoder::new`).
    pub decoder: String,
@@ -262,11 +255,6 @@ fn pump(
        // This display's HDR volume → the host's virtual-display EDID. The env hatch wins so an
        // A/B run can pin an exact peak (PUNKTFUNK_CLIENT_PEAK_NITS=600).
        punktfunk_core::client::display_hdr_env_override().or(params.display_hdr),
-        if params.cursor_forward {
-            punktfunk_core::quic::CLIENT_CAP_CURSOR
-        } else {
-            0
-        },
        params.launch.clone(),
        params.pin,
        Some(params.identity),
@@ -212,40 +212,6 @@ pub fn persist_host(name: &str, addr: &str, port: u16, fp_hex: &str, paired: boo
    let _ = known.save();
 }

-/// This machine's name — the label a host files this client under in its paired-devices list.
-/// `/etc/hostname` first (the answer on any Linux box, and the only one available in a minimal
-/// build with no GTK to ask), then the usual environment fallbacks.
-pub fn device_name() -> String {
-    #[cfg(target_os = "linux")]
-    if let Ok(s) = std::fs::read_to_string("/etc/hostname") {
-        let s = s.trim();
-        if !s.is_empty() {
-            return s.to_string();
-        }
-    }
-    std::env::var("COMPUTERNAME")
-        .or_else(|_| std::env::var("HOSTNAME"))
-        .ok()
-        .filter(|s| !s.trim().is_empty())
-        .unwrap_or_else(|| "This device".into())
-}
-
-/// Drop an fp-less placeholder entry for `addr:port`. A host added by address before any
-/// ceremony (`--add-host` with no `--fp`) is stored keyed by address with an empty fingerprint;
-/// once pairing yields the real one, [`persist_host`] writes a second, fp-keyed entry — so the
-/// placeholder has to go or the host list shows the same box twice. No-op (and no disk write)
-/// when there is none, which is the usual case.
-pub fn forget_placeholder(addr: &str, port: u16) {
-    let mut known = KnownHosts::load();
-    let before = known.hosts.len();
-    known
-        .hosts
-        .retain(|h| !(h.fp_hex.is_empty() && h.addr == addr && h.port == port));
-    if known.hosts.len() != before {
-        let _ = known.save();
-    }
-}
-
 /// Learn/refresh a saved host's Wake-on-LAN MAC(s) from its live advert (called while the host
 /// is online, matched by fingerprint or address). No-op — and no disk write — when unchanged, so
 /// the hosts page can call it on every discovery tick without churning the store.
@@ -359,11 +325,6 @@ pub fn connect_reject_message(reason: punktfunk_core::reject::RejectReason) -> S
            "Client and host versions don't match — update both to the same release.".into()
        }
        R::Busy => "The host is busy with another session.".into(),
-        R::SetupFailed => {
-            "The host accepted the connection but couldn't start the stream — the host's log \
-             (web console → Log) has the cause."
-                .into()
-        }
    }
 }

@@ -6,12 +6,11 @@
 //! queue under the device's [`QueueLock`], fence-waited (sub-ms — Phase-0 measured
 //! 0.067 ms GPU at 1080p on the RTX 5070 Ti).
 //!
-//! Output: three separate single-component planes (Y full-res; Cb/Cr half-res, or
-//! full-res on a 4:4:4 session) — R8, or R16 UNORM on a 10-bit session — the decode
-//! path requires STORAGE usage and IDENTITY/R swizzles, so the encoder's two-component
-//! RG trick is not allowed here (pyrowave.h validation). The presenter samples them
-//! with its planar CSC variant (colour per the negotiated `ColorInfo` — the wavelet
-//! bitstream carries no VUI). A small ring of plane-sets keeps a decode from overwriting the set
+//! Output: three separate R8 planes (Y full-res, Cb/Cr half-res) — the decode path
+//! requires STORAGE usage and IDENTITY/R swizzles, so the encoder's two-component
+//! RG8 trick is not allowed here (pyrowave.h validation). The presenter samples them
+//! with its planar CSC variant (BT.709 limited — the codec's fixed colour contract,
+//! there is no VUI). A small ring of plane-sets keeps a decode from overwriting the set
 //! the presenter is still sampling; the synchronous fence bounds decode-side reuse and
 //! the ring depth covers present-side latency (≤ 1–2 frames in this pipeline).
 //!
@@ -223,10 +222,9 @@ unsafe extern "C" fn queue_unlock_cb(ud: *mut c_void) {
    unsafe { (*(ud as *const crate::video::QueueLock)).unlock() }
 }

-/// One decoded PyroWave frame: three single-component plane images (R8, or R16 on a
-/// 10-bit session) on the presenter's device, GENERAL layout, decode-complete (the
-/// decoder fence-waits before handing it over). `slot` identifies the ring entry; the
-/// images/views live as long as the decoder.
+/// One decoded PyroWave frame: three R8 plane images on the presenter's device, GENERAL
+/// layout, decode-complete (the decoder fence-waits before handing it over). `slot`
+/// identifies the ring entry; the images/views live as long as the decoder.
 pub struct PyroWavePlanarFrame {
    /// Raw `VkImageView`s (Y, Cb, Cr) for the presenter's planar CSC sampling.
    pub views: [u64; 3],
@@ -254,8 +252,7 @@ struct RetiredRing {
    retired_at: Instant,
 }

-/// One decode-output plane (`fmt` = R8, or R16 on a 10-bit session): storage (decode
-/// writes) + sampled (presenter CSC).
+/// One decode-output plane: R8, storage (decode writes) + sampled (presenter CSC).
 unsafe fn make_plane(
    device: &ash::Device,
    mem_props: &vk::PhysicalDeviceMemoryProperties,
@@ -542,8 +539,7 @@ impl PyroWaveDecoder {
            return Err(e);
        }

-        // Plane-set ring: 3 single-component planes (R8; R16 on a 10-bit session),
-        // storage (decode writes) + sampled (presenter CSC).
+        // Plane-set ring: 3 × R8, storage (decode writes) + sampled (presenter CSC).
        let mem_props = instance.get_physical_device_memory_properties(
            vk::PhysicalDevice::from_raw(vkd.physical_device as u64),
        );
@@ -877,26 +873,12 @@ impl PyroWaveDecoder {
            &vk::DependencyInfo::default().image_memory_barriers(&pre),
        );

-        // The declared format/extent MUST equal the ring image's real ones: pyrowave wraps
-        // our VkImage under `image_format` and vkCreateImageView's its storage view with
-        // `view_format` (pyrowave_c.cpp `WrappedViewBuffers::wrap` — its own
-        // `pyrowave_image_get_image_view` helper fills both from the image itself).
-        // Declaring R8 over a 10-bit session's R16_UNORM planes is an invalid view the
-        // driver executes anyway: its addressing covers half the surface, so decoded 8-bit
-        // codes fuse pairwise into 16-bit texels (structured garbage) and the never-written
-        // remainder samples as all-plane zeros (saturated green) — the 2026-07 AMD-client
-        // field report. Same discipline for chroma extents: a 4:4:4 ring is full-res.
-        let fmt = if self.hdr16 {
-            pw::VkFormat_VK_FORMAT_R16_UNORM
-        } else {
-            pw::VkFormat_VK_FORMAT_R8_UNORM
-        };
        let plane = |img: vk::Image, w: u32, h: u32| pw::pyrowave_image_view {
            image: img.as_raw() as usize as pw::VkImage,
            width: w,
            height: h,
-            image_format: fmt,
-            view_format: fmt,
+            image_format: pw::VkFormat_VK_FORMAT_R8_UNORM,
+            view_format: pw::VkFormat_VK_FORMAT_R8_UNORM,
            mip_level: 0,
            layer: 0,
            aspect: pw::VkImageAspectFlagBits_VK_IMAGE_ASPECT_COLOR_BIT,
@@ -904,16 +886,11 @@ impl PyroWaveDecoder {
            layout: pw::VkImageLayout_VK_IMAGE_LAYOUT_GENERAL,
        };
        let (w, h) = (self.width, self.height);
-        let (cw, ch) = if self.chroma444 {
-            (w, h)
-        } else {
-            (w / 2, h / 2)
-        };
        let buffers = pw::pyrowave_gpu_buffers {
            planes: [
                plane(self.ring[slot].imgs[0], w, h),
-                plane(self.ring[slot].imgs[1], cw, ch),
-                plane(self.ring[slot].imgs[2], cw, ch),
+                plane(self.ring[slot].imgs[1], w / 2, h / 2),
+                plane(self.ring[slot].imgs[2], w / 2, h / 2),
            ],
        };
        pw::pyrowave_device_set_command_buffer(
@@ -66,31 +66,7 @@ pub const fn interface_guid_fields() -> (u32, u16, u16, [u8; 8]) {
 /// too ([`MIN_DRIVER_PROTOCOL_VERSION`]) and simply falls back to the re-arrival resize against it;
 /// a v4 driver serving an older (v3-asserting) host fails that host's strict handshake — ship
 /// driver+host together, as ever.
-/// v5: ADDITIVE — the IddCx HARDWARE CURSOR channel (remote-desktop-sweep M2c):
-/// [`control::AddRequest::hw_cursor`] (the former tail `_reserved` — same size, same offsets)
-/// asks the driver to declare a hardware cursor for this monitor (DWM then EXCLUDES the pointer
-/// from the desktop frame and delivers shape/position out-of-band), and
-/// [`control::IOCTL_SET_CURSOR_CHANNEL`] delivers the host-created [`cursor::CursorShm`] section
-/// the driver's cursor thread seqlock-publishes into. Nothing existing changed; the host gates
-/// the feature on the handshake-reported version (`>= 5`) and keeps composited-cursor behavior
-/// against older drivers.
-/// v6: ADDITIVE — [`control::IOCTL_SET_CURSOR_FORWARD`] (the mid-stream cursor-render flip,
-/// remote-desktop-sweep §8): the client's mouse-model flip (un)declares the hardware cursor on a
-/// LIVE monitor, so the capture mouse model gets DWM's composited pointer back (full fidelity)
-/// and the desktop model gets exclusion + forwarding. Nothing existing changed; against a v5
-/// driver the unknown IOCTL fails and the host logs + keeps the declared-at-ADD behavior.
-/// v6 tail ext (no bump, the `AddRequest` luminance-tail discipline):
-/// [`control::AddReply::cursor_excluded`] — the driver reports whether its ADAPTER already
-/// carries a hardware-cursor declare from an earlier session. A declare is IRREVOCABLE
-/// (remote-desktop-sweep §8.6, proven on-glass) and its exclusion reaches EVERY later monitor of
-/// the adapter, not just the declaring target (on-glass 2026-07-23: a declare on one target left
-/// a different client's fresh target cursor-less): DWM never composites the software cursor back
-/// into any of the adapter's frames until the adapter resets. The host uses the flag to
-/// self-composite the pointer (GDI poller + blend) in sessions that never negotiate the
-/// cursor channel — without it those sessions are silently cursor-less. Both skews degrade
-/// cleanly: an old driver writes only the 20-byte reply prefix (host reads `0` = unknown/clean),
-/// an old host retrieves a 20-byte buffer (driver writes just the prefix).
-pub const PROTOCOL_VERSION: u32 = 6;
+pub const PROTOCOL_VERSION: u32 = 4;

 /// The OLDEST driver protocol this host still drives (v4 is additive over v3 — see the v4 note on
 /// [`PROTOCOL_VERSION`]): a v3 driver lacks only `IOCTL_UPDATE_MODES`, which the host gates on the
@@ -134,22 +110,6 @@ pub mod control {
    /// identity (saved per-monitor DPI) and the driver's swap-chain/stash machinery survive. A v3
    /// driver fails this unknown IOCTL → the host falls back to the re-arrival resize.
    pub const IOCTL_UPDATE_MODES: u32 = ctl_code(0x907);
-    /// Deliver a monitor's hardware-cursor channel (v5): the handle VALUE of the unnamed
-    /// [`cursor::CursorShm`](crate::cursor) file mapping the host duplicated into the WUDFHost
-    /// (same delivery model as [`IOCTL_SET_FRAME_CHANNEL`], no event — the host polls the
-    /// seqlock at its encode-tick pace). Sent once after ADD, only for a monitor whose
-    /// [`AddRequest::hw_cursor`] was set. The driver maps it, calls
-    /// `IddCxMonitorSetupHardwareCursor`, and starts its cursor-query thread. Input
-    /// [`SetCursorChannelRequest`].
-    pub const IOCTL_SET_CURSOR_CHANNEL: u32 = ctl_code(0x908);
-    /// Flip a LIVE monitor's hardware-cursor declaration (v6, the mid-stream cursor-render
-    /// flip): `enable = 1` re-declares (`IddCxMonitorSetupHardwareCursor` — DWM excludes the
-    /// pointer, the query/shape machinery resumes), `enable = 0` un-declares (the driver stops
-    /// re-declaring on mode commits and asks the OS to revert to the software cursor — DWM
-    /// composites the pointer into the frame, the pre-channel behavior the capture mouse
-    /// model wants). Only meaningful for a monitor whose cursor channel was delivered. Input
-    /// [`SetCursorForwardRequest`].
-    pub const IOCTL_SET_CURSOR_FORWARD: u32 = ctl_code(0x909);

    /// `IOCTL_ADD` input. A monotonic `session_id` keys the monitor (the host's refcount manager owns
    /// collision safety — no more SudoVDA's 16-byte GUID + pid-mangling). The driver advertises this
@@ -187,13 +147,9 @@ pub mod control {
        /// The client display's min luminance in MILLI-nits (0.001 cd/m² — the CTA min-luminance
        /// range lives well below 1 nit) → Desired Content Min Luminance. `0` = unknown.
        pub min_luminance_millinits: u32,
-        /// Non-zero = declare an IddCx HARDWARE CURSOR for this monitor (v5, remote-desktop-sweep
-        /// M2c): DWM stops compositing the pointer into the frame and the driver publishes
-        /// shape/position into the [`cursor::CursorShm`](crate::cursor) section delivered by
-        /// [`IOCTL_SET_CURSOR_CHANNEL`]. Byte-compatible with the old tail `_reserved` (offset 36):
-        /// an un-upgraded driver ignores it (cursor stays composited — the host already gates on
-        /// the handshake version, this is defense in depth), an un-upgraded host sends `0` (off).
-        pub hw_cursor: u32,
+        /// Pads the `u64`-aligned struct to a multiple of 8 (Pod forbids implicit tail padding);
+        /// free expansion room for the next appended field.
+        pub _reserved: u32,
    }

    /// [`AddRequest`]'s size before the client-HDR luminance tail — the prefix an un-upgraded
@@ -218,22 +174,8 @@ pub mod control {
        /// `DuplicateHandle`, then [`IOCTL_SET_FRAME_CHANNEL`]). Reported per-ADD, not per-open, so a
        /// WUDFHost restart between sessions can never leave the host duplicating into a dead process.
        pub wudf_pid: u32,
-        /// Non-zero = the ADAPTER already carries an IRREVOCABLE hardware-cursor declare from an
-        /// earlier session (remote-desktop-sweep §8.6; reach is adapter-wide, not per-target —
-        /// on-glass 2026-07-23): DWM excludes the pointer from every frame on every monitor until
-        /// the adapter resets, and a session without the cursor channel must
-        /// self-composite (GDI poller + blend) or stream a cursor-less desktop. Appended after
-        /// [`ADD_REPLY_LEGACY_SIZE`] under the same dual-size discipline as the `AddRequest`
-        /// luminance tail: an un-upgraded driver writes only the legacy prefix (the host's
-        /// zero-initialized buffer then reads `0` = unknown/clean), an un-upgraded host retrieves a
-        /// legacy-size buffer (the driver writes just the prefix).
-        pub cursor_excluded: u32,
    }

-    /// [`AddReply`]'s size before the `cursor_excluded` tail — the prefix an un-upgraded driver
-    /// writes and an un-upgraded host retrieves (see the field docs).
-    pub const ADD_REPLY_LEGACY_SIZE: usize = 20;
-
    /// `IOCTL_REMOVE` input.
    #[repr(C)]
    #[derive(Clone, Copy, Pod, Zeroable, Debug, PartialEq, Eq)]
@@ -311,29 +253,6 @@ pub mod control {
    /// at the compile-time maximum; `ring_len` says how many entries are live).
    pub const RING_LEN_USIZE: usize = RING_LEN as usize;

-    /// `IOCTL_SET_CURSOR_CHANNEL` input (v5): the hardware-cursor section for one monitor.
-    #[repr(C)]
-    #[derive(Clone, Copy, Pod, Zeroable, Debug, PartialEq, Eq)]
-    pub struct SetCursorChannelRequest {
-        /// The OS target id from [`AddReply`] — which monitor this channel belongs to.
-        pub target_id: u32,
-        pub _pad: u32,
-        /// The [`cursor::CursorShm`](crate::cursor) file-mapping handle VALUE, already duplicated
-        /// into the driver's WUDFHost process ([`AddReply::wudf_pid`]).
-        pub header_handle: u64,
-    }
-
-    /// `IOCTL_SET_CURSOR_FORWARD` input (v6): the mid-stream cursor-render flip for one monitor.
-    #[repr(C)]
-    #[derive(Clone, Copy, Pod, Zeroable, Debug, PartialEq, Eq)]
-    pub struct SetCursorForwardRequest {
-        /// The OS target id from [`AddReply`] — which monitor to flip.
-        pub target_id: u32,
-        /// `1` = declare the hardware cursor (exclude + forward), `0` = un-declare (DWM
-        /// composites — the capture mouse model).
-        pub enable: u32,
-    }
-
    // Layout is load-bearing across the process boundary — pin it. (bytemuck's Pod derive already
    // rejects any internal padding; these assert the externally-visible sizes too.) The `offset_of!`
    // asserts additionally catch a SAME-SIZE field reorder, which the size+Pod checks alone miss.
@@ -350,18 +269,13 @@ pub mod control {
        assert!(offset_of!(AddRequest, max_luminance_nits) == ADD_REQUEST_LEGACY_SIZE);
        assert!(offset_of!(AddRequest, max_frame_avg_nits) == 28);
        assert!(offset_of!(AddRequest, min_luminance_millinits) == 32);
-        // v5: the former tail `_reserved` — same offset, same total size (rename-only).
-        assert!(offset_of!(AddRequest, hw_cursor) == 36);
-        assert!(size_of::<AddRequest>() == 40);

-        assert!(size_of::<AddReply>() == 24);
+        assert!(size_of::<AddReply>() == 20);
        assert!(offset_of!(AddReply, adapter_luid_low) == 0);
        assert!(offset_of!(AddReply, adapter_luid_high) == 4);
        assert!(offset_of!(AddReply, target_id) == 8);
        assert!(offset_of!(AddReply, resolved_monitor_id) == 12);
        assert!(offset_of!(AddReply, wudf_pid) == 16);
-        // The cursor-excluded tail starts exactly at the legacy boundary (prefix-compat).
-        assert!(offset_of!(AddReply, cursor_excluded) == ADD_REPLY_LEGACY_SIZE);

        assert!(size_of::<SetFrameChannelRequest>() == 32 + 8 * RING_LEN_USIZE);
        assert!(offset_of!(SetFrameChannelRequest, target_id) == 0);
@@ -374,13 +288,6 @@ pub mod control {
        assert!(size_of::<RemoveRequest>() == 8);
        assert!(offset_of!(RemoveRequest, session_id) == 0);

-        assert!(size_of::<SetCursorChannelRequest>() == 16);
-        assert!(offset_of!(SetCursorChannelRequest, target_id) == 0);
-        assert!(offset_of!(SetCursorChannelRequest, header_handle) == 8);
-        assert!(size_of::<SetCursorForwardRequest>() == 8);
-        assert!(offset_of!(SetCursorForwardRequest, target_id) == 0);
-        assert!(offset_of!(SetCursorForwardRequest, enable) == 4);
-
        assert!(size_of::<UpdateModesRequest>() == 24);
        assert!(offset_of!(UpdateModesRequest, session_id) == 0);
        assert!(offset_of!(UpdateModesRequest, width) == 8);
@@ -1053,84 +960,6 @@ pub mod mouse {
    };
 }

-/// The v5 hardware-cursor channel (remote-desktop-sweep M2c): one unnamed file mapping per
-/// monitor, host-created, delivered by handle value ([`control::IOCTL_SET_CURSOR_CHANNEL`]).
-/// The DRIVER's cursor thread (woken by its IddCx `hNewCursorDataAvailable` event) seqlock-writes
-/// shape + position + visibility; the HOST reads at its encode-tick pace — no event crosses the
-/// boundary. Writer: bump [`CursorShm::seq`] to ODD, write fields (+ shape bytes when the OS said
-/// the shape changed), bump to EVEN. Reader: read seq (retry while odd), copy, re-read seq —
-/// unchanged ⇒ consistent snapshot. Position-only updates never touch the shape bytes, so a
-/// reader that skips unchanged `shape_id`s never copies torn pixels.
-pub mod cursor {
-    use bytemuck::{Pod, Zeroable};
-
-    /// First field of [`CursorShm`] — `b"PFCU"` little-endian; anything else = not attached yet.
-    pub const CURSOR_MAGIC: u32 = u32::from_le_bytes(*b"PFCU");
-
-    /// Max cursor side (px) the driver declares to the OS (`IDDCX_CURSOR_CAPS::MaxX/MaxY`) and
-    /// the section's shape buffer is sized for. Windows XL accessibility cursors top out here;
-    /// the host's wire forwarder downscales to its own cap anyway.
-    pub const CURSOR_SHAPE_MAX: u32 = 256;
-
-    /// Shape-buffer bytes: 32-bpp at the declared max.
-    pub const CURSOR_SHAPE_BYTES: usize = (CURSOR_SHAPE_MAX * CURSOR_SHAPE_MAX * 4) as usize;
-
-    /// Byte offset of the shape pixels inside the section (one cache-line-ish header).
-    pub const CURSOR_SHAPE_OFFSET: usize = 64;
-
-    /// Total section size.
-    pub const CURSOR_SHM_SIZE: usize = CURSOR_SHAPE_OFFSET + CURSOR_SHAPE_BYTES;
-
-    /// `IDDCX_CURSOR_SHAPE_TYPE` values mirrored for the host (the driver writes the OS value
-    /// verbatim into [`CursorShm::cursor_type`]).
-    pub const CURSOR_TYPE_MASKED_COLOR: u32 = 1;
-    pub const CURSOR_TYPE_ALPHA: u32 = 2;
-
-    /// The section header (the shape pixels follow at [`CURSOR_SHAPE_OFFSET`]). `x`/`y` are the
-    /// shape's TOP-LEFT in desktop coordinates (the IddCx `IDARG_OUT_QUERY_HWCURSOR::X/Y`
-    /// convention — position − hotspot, can be negative); `shape_id` is the OS's per-set counter
-    /// (bumps on every shape set, the overlay serial); pixels are the OS's 32-bpp rows at
-    /// `pitch` bytes (BGRA for ALPHA; color+mask for MASKED_COLOR — the host converts).
-    #[repr(C)]
-    #[derive(Clone, Copy, Pod, Zeroable, Debug, PartialEq, Eq)]
-    pub struct CursorShm {
-        pub magic: u32,
-        /// Seqlock: odd = writer mid-update.
-        pub seq: u32,
-        pub visible: u32,
-        pub cursor_type: u32,
-        pub x: i32,
-        pub y: i32,
-        pub shape_id: u32,
-        pub width: u32,
-        pub height: u32,
-        pub pitch: u32,
-        pub hot_x: u32,
-        pub hot_y: u32,
-        /// Reserved expansion room up to [`CURSOR_SHAPE_OFFSET`].
-        pub _reserved: [u32; 4],
-    }
-
-    // Layout is load-bearing across the process boundary — pin it.
-    const _: () = {
-        use core::mem::{offset_of, size_of};
-        assert!(size_of::<CursorShm>() == 64);
-        assert!(size_of::<CursorShm>() <= CURSOR_SHAPE_OFFSET);
-        assert!(offset_of!(CursorShm, magic) == 0);
-        assert!(offset_of!(CursorShm, seq) == 4);
-        assert!(offset_of!(CursorShm, visible) == 8);
-        assert!(offset_of!(CursorShm, cursor_type) == 12);
-        assert!(offset_of!(CursorShm, x) == 16);
-        assert!(offset_of!(CursorShm, y) == 20);
-        assert!(offset_of!(CursorShm, shape_id) == 24);
-        assert!(offset_of!(CursorShm, width) == 28);
-        assert!(offset_of!(CursorShm, height) == 32);
-        assert!(offset_of!(CursorShm, pitch) == 36);
-        assert!(offset_of!(CursorShm, hot_x) == 40);
-        assert!(offset_of!(CursorShm, hot_y) == 44);
-    };
-}
-
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -1250,7 +1079,7 @@ mod tests {
            max_luminance_nits: 800,
            max_frame_avg_nits: 400,
            min_luminance_millinits: 50, // 0.05 nits
-            hw_cursor: 1,
+            _reserved: 0,
        };
        let bytes = bytemuck::bytes_of(&req);
        assert_eq!(bytes.len(), 40);
@@ -1280,19 +1109,14 @@ mod tests {
            target_id: 262,
            resolved_monitor_id: 7,
            wudf_pid: 4242,
-            cursor_excluded: 1,
        };
        let rbytes = bytemuck::bytes_of(&reply);
-        assert_eq!(rbytes.len(), 24);
+        assert_eq!(rbytes.len(), 20);
        assert_eq!(*bytemuck::from_bytes::<control::AddReply>(rbytes), reply);
        // resolved_monitor_id occupies the old `_reserved` slot at offset 12 — byte-compatible.
        assert_eq!(rbytes[12..16], 7u32.to_le_bytes());
        // The v2 duplication-target pid trails at offset 16.
        assert_eq!(rbytes[16..20], 4242u32.to_le_bytes());
-        // The cursor-excluded tail rides after the legacy boundary; an un-upgraded driver writes
-        // only the prefix, so a zero-filled tail reads as "unknown/clean" (see the field docs).
-        assert_eq!(rbytes[20..24], 1u32.to_le_bytes());
-        assert_eq!(control::ADD_REPLY_LEGACY_SIZE, 20);
    }

    #[test]
@@ -1337,39 +1161,11 @@ mod tests {
            req
        );
        assert_eq!(bytes[8..12], 2560u32.to_le_bytes());
-        // The compat window: v4–v6 are additive over v3, so the host floor stays at 3.
-        assert_eq!(PROTOCOL_VERSION, 6);
+        // The compat window: v4 is additive over v3, so the host floor stays one below.
+        assert_eq!(PROTOCOL_VERSION, 4);
        assert_eq!(MIN_DRIVER_PROTOCOL_VERSION, 3);
    }

-    #[test]
-    fn cursor_shm_layout_is_pinned() {
-        use cursor::*;
-        // The header must leave the shape offset intact whatever grows inside `_reserved`.
-        assert_eq!(core::mem::size_of::<CursorShm>(), 64);
-        assert_eq!(CURSOR_SHM_SIZE, 64 + 256 * 256 * 4);
-        assert_eq!(CURSOR_MAGIC, u32::from_le_bytes(*b"PFCU"));
-        // Seqlock snapshot discipline survives a bytemuck roundtrip.
-        let hdr = CursorShm {
-            magic: CURSOR_MAGIC,
-            seq: 2,
-            visible: 1,
-            cursor_type: CURSOR_TYPE_ALPHA,
-            x: -3,
-            y: 7,
-            shape_id: 42,
-            width: 32,
-            height: 32,
-            pitch: 128,
-            hot_x: 4,
-            hot_y: 5,
-            _reserved: [0; 4],
-        };
-        let bytes = bytemuck::bytes_of(&hdr);
-        assert_eq!(*bytemuck::from_bytes::<CursorShm>(bytes), hdr);
-        assert_eq!(bytes[16..20], (-3i32).to_le_bytes());
-    }
-
    #[test]
    fn gamepad_names_and_magics_are_stable() {
        assert_eq!(gamepad::xusb_boot_name(0), "Global\\pfxusb-boot-0");
@@ -7,45 +7,6 @@
 use anyhow::Result;
 use pf_frame::CapturedFrame;

-/// Whether an encoder fed `format` must be built 10-bit — decided by **the pixels that actually
-/// arrive**, never by the negotiated `bit_depth`.
-///
-/// The three Windows backends each derived this as `bit_depth >= 10 || matches!(format, P010 |
-/// Rgb10a2)`, i.e. the *negotiated* depth could force a 10-bit encoder over an 8-bit capture. That
-/// combination is not hypothetical: a client advertises 10-bit, the handshake negotiates
-/// `bit_depth = 10`, and then enabling advanced colour on the IDD virtual display fails — at which
-/// point the capturer says so and delivers 8-bit NV12 anyway (`pf-capture`'s idd_push logs "10-bit
-/// HDR was negotiated but enabling advanced color on the virtual display FAILED — encoding 8-bit
-/// SDR"). Every backend then lost the session, each in its own way: native AMF and native QSV
-/// `bail!` at open because the format does not match the P010 they derived, and the libavcodec
-/// path accepted the open and then failed EVERY submit forever (its per-frame depth check
-/// recomputes from the frame, which never matches), where `reset()` could not help because the
-/// rebuild re-derived the same wrong depth.
-///
-/// Following the pixels keeps the stream alive and, more importantly, keeps it HONEST: the depth
-/// also selects the colour signalling (BT.2020 PQ vs BT.709) and the staging surface format, so an
-/// 8-bit capture now yields an 8-bit stream that says it is SDR — which is what the capturer
-/// already reported it is sending. The negotiated depth remains an upper bound; the session label
-/// may still claim HDR, and that mismatch belongs to the negotiation, not to the encoder.
-/// Windows-only: the three backends that derive an encoder depth from a capture live there
-/// (native AMF, native QSV, libavcodec AMF/QSV). The Linux backends take the depth from the
-/// negotiated `bit_depth` alone because their capture formats carry it unambiguously.
-#[cfg(target_os = "windows")]
-pub(crate) fn ten_bit_input(format: pf_frame::PixelFormat, negotiated_depth: u8) -> bool {
-    use pf_frame::PixelFormat;
-    let ten = matches!(format, PixelFormat::P010 | PixelFormat::Rgb10a2);
-    if negotiated_depth >= 10 && !ten {
-        tracing::warn!(
-            ?format,
-            negotiated_depth,
-            "session negotiated 10-bit but the capturer delivers an 8-bit format — encoding 8-bit \
-             SDR (the stream's colour signalling follows the pixels; check whether advanced colour \
-             failed to enable on the virtual display)"
-        );
-    }
-    ten
-}
-
 /// An encoded access unit (one NAL/AU) to hand to `punktfunk_core` for FEC + packetization.
 /// `data` is in-band Annex-B (the encoder is opened without a global header), so each
 /// keyframe carries its own VPS/SPS/PPS — the bytes are both a playable elementary
@@ -112,7 +73,7 @@ impl AuChunk {
 }

 /// Codec selection negotiated with the client.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum Codec {
    H264,
    H265,
@@ -249,16 +210,9 @@ impl Codec {
    }
 }

-/// Static capabilities an [`Encoder`] declares so the session glue routes loss-recovery and
-/// cursor plumbing by *query* rather than relying on a method's no-op/`false` default. Cheap
-/// `Copy`; fixed for the session (an HDR toggle re-initialises the encoder — re-query if that
-/// matters).
-///
-/// (There is deliberately NO `supports_hdr_metadata` cap: in-band HDR SEI/OBU embedding needs no
-/// host-side routing — every first-party client reads the static grade exclusively out-of-band
-/// (the native 0xCE datagram / the GameStream 0x010e control message), both planes send it
-/// unconditionally, and the in-band grade is a decoder-side bonus for stock clients. A cap field
-/// nothing reads is a contract nobody honors; it was deleted after shipping write-only.)
+/// Static capabilities an [`Encoder`] declares so the session glue routes loss-recovery and HDR
+/// plumbing by *query* rather than relying on a method's no-op/`false` default. Cheap `Copy`; fixed
+/// for the session (an HDR toggle re-initialises the encoder — re-query if that matters).
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
 pub struct EncoderCaps {
    /// The encoder can perform real reference-frame invalidation — i.e.
@@ -268,6 +222,10 @@ pub struct EncoderCaps {
    /// AMF (user-LTR force-reference, when the driver accepted the LTR slots at open). The
    /// libavcodec paths (Linux NVENC, VAAPI, QSV) can't express it and always keyframe.
    pub supports_rfi: bool,
+    /// The encoder emits in-band HDR mastering/CLL SEI from [`set_hdr_meta`](Encoder::set_hdr_meta).
+    /// When `false`, `set_hdr_meta` is a no-op and no in-band grade reaches the client. Only the
+    /// Windows direct-NVENC path attaches it today.
+    pub supports_hdr_metadata: bool,
    /// The opened encoder is actually producing a full-chroma 4:4:4 (`chroma_format_idc = 3`) stream.
    /// `false` on every 4:2:0 session (the default) and on a backend that declined 4:4:4. Set by the
    /// NVENC backends (Linux + Windows). The chroma is committed to the wire (`Welcome::chroma_format`)
@@ -297,22 +255,6 @@ pub struct EncoderCaps {
    /// `USER_FLAG_RECOVERY_POINT` on every Nth emitted AU, re-phased at each IDR). 0 when intra-refresh
    /// is off. Only consulted when [`intra_refresh_recovery`](Self::intra_refresh_recovery) is set.
    pub intra_refresh_period: u32,
-    /// The encoder composites [`CapturedFrame::cursor`] into the picture it encodes.
-    ///
-    /// `open_video`'s `cursor_blend` argument is a REQUEST, and for most of this crate's life it was
-    /// nothing else: `lib.rs` literally did `let _ = cursor_blend;` and only three backends ever read
-    /// `frame.cursor`. So a session could ask for a composited pointer, get a backend that silently
-    /// discards it, and stream with no mouse cursor at all — the confirmed symptom on the VAAPI
-    /// dmabuf path and the libav-NVENC CUDA path.
-    ///
-    /// This makes the answer queryable instead of assumed. It is deliberately a plain fact about the
-    /// encoder, not a policy: what to DO when a session wants blending and the backend cannot is the
-    /// host's call, since only the host can re-plan capture. That call is wired now — the
-    /// negotiation consults the pre-open mirror ([`cursor_blend_capable`](crate::cursor_blend_capable))
-    /// to gate the cursor channel and to keep capture on embedded-cursor / CSC-capable shapes for
-    /// any backend that can't blend; `open_video`'s post-open check remains as the backstop for
-    /// open-time fallbacks the plan can't see.
-    pub blends_cursor: bool,
 }

 /// A hardware encoder. One per session; runs on the encode thread.
@@ -339,10 +281,11 @@ pub trait Encoder: Send {
        let _ = wire_index;
        self.submit(frame)
    }
-    /// This encoder's static [capabilities](EncoderCaps) (RFI, intra-refresh, chroma, cursor
-    /// blending), so the session glue can route by query rather than rely on the no-op/`false`
-    /// defaults of methods like [`invalidate_ref_frames`](Self::invalidate_ref_frames).
-    /// Default: no optional capabilities (the software / libavcodec backends).
+    /// This encoder's static [capabilities](EncoderCaps) (RFI, HDR SEI), so the session glue can
+    /// route by query rather than rely on the no-op/`false` defaults of
+    /// [`invalidate_ref_frames`](Self::invalidate_ref_frames) / [`set_hdr_meta`](Self::set_hdr_meta).
+    /// Default: no optional capabilities (the SDR / libavcodec backends) — only the direct-NVENC
+    /// path overrides it.
    fn caps(&self) -> EncoderCaps {
        EncoderCaps::default()
    }
@@ -350,12 +293,10 @@ pub trait Encoder: Send {
    /// reference-frame-invalidation request). Default: no-op.
    fn request_keyframe(&mut self) {}
    /// Set the source's static HDR mastering metadata (from the capturer). An HDR encoder emits it
-    /// in-band (HEVC/H.264 `mastering_display_colour_volume` + `content_light_level_info` SEI, or
-    /// AV1 metadata OBUs) on keyframes so a stock decoder — e.g. stock Moonlight — tone-maps from
-    /// the source's real grade. Default: no-op (SDR encoders / paths that don't attach it).
-    /// Cheap to call every frame; consumed by Windows direct-NVENC, native AMF, and native QSV.
-    /// Every first-party client reads the grade out-of-band (the 0xCE datagram) regardless, so
-    /// this is a bonus for stock decoders, never the primary channel.
+    /// as in-band SEI (`mastering_display_colour_volume` + `content_light_level_info`) on each
+    /// keyframe so any decoder — including stock Moonlight — tone-maps from the source's real grade.
+    /// Default: no-op (SDR encoders / libavcodec paths that don't attach it yet). Cheap to call
+    /// every frame; only the direct-NVENC path consumes it.
    fn set_hdr_meta(&mut self, _meta: Option<punktfunk_core::quic::HdrMeta>) {}
    /// Invalidate a contiguous range of previously-encoded reference frames (client frame numbers
    /// — WIRE frame indexes, the domain [`submit_indexed`](Self::submit_indexed) pins the encoder's
@@ -372,15 +313,8 @@ pub trait Encoder: Send {
    /// encoder analog of the capturer depth escalation: AUs ride ~one loop tick behind (`poll`
    /// may return `None` while an encode is in flight) in exchange for capture/submit no longer
    /// serializing on the encode wait. Returns whether pipelined retrieve is (now) active; the
-    /// switch may be deferred to the next safe point internally. `set_pipelined(true)` returning
-    /// `false` (the default impl) = unsupported — the session loop stops asking.
-    ///
-    /// `set_pipelined(false)` requests the wind-back (de-escalation, latency recovery): the
-    /// backend restores its sync-retrieve mode — and the latency features that mode carries
-    /// (IO-stream binding, sub-frame chunking) — at its next safe point, usually via a session
-    /// rebuild whose first frame is an IDR. The return is still "is pipelined retrieve active":
-    /// the caller polls until it reads `false`. Backends that never escalate return `false`
-    /// trivially. An operator pin (`PUNKTFUNK_NVENC_ASYNC=1`) refuses the wind-back.
+    /// switch may be deferred to the next safe point internally. `false` from the default impl =
+    /// unsupported — the session loop stops asking. De-escalation is a v2 item everywhere.
    fn set_pipelined(&mut self, _on: bool) -> bool {
        false
    }
@@ -426,16 +360,6 @@ pub trait Encoder: Send {
    fn reconfigure_bitrate(&mut self, _bps: u64) -> bool {
        false
    }
-    /// The bitrate (bps) the encoder is ACTUALLY running at (or will open at, for a lazily-opened
-    /// backend) — the encoder-side truth after any internal clamp, e.g. the direct-NVENC
-    /// codec-level ceiling search. The session loop reads this after every open/reconfigure and
-    /// stores IT, not the requested rate, as the live bitrate — so the send pacer, the console
-    /// and the client controller's ack all track what the ASIC really targets (a controller fed
-    /// the requested rate keeps climbing from a phantom base, §ABR overdrive). `None` (the
-    /// default) = the backend doesn't track an applied rate; the caller keeps the requested one.
-    fn applied_bitrate_bps(&self) -> Option<u64> {
-        None
-    }
    /// Wire-chunk the encoder's AUs at the session's shard payload size (the PyroWave
    /// datagram-aligned mode, plan §4.4): every `shard_payload` window of the emitted AU
    /// starts a fresh self-delimiting codec packet, zero-padded to the window — so a lost
@@ -455,20 +379,6 @@ pub trait Encoder: Send {
    fn set_input_ring_depth(&mut self, _depth: usize) {}
    /// Signal end-of-stream. After this, drain the remaining AUs with [`poll`](Self::poll)
    /// until it returns `None` — NVENC buffers frames internally even at `delay=0`.
-    ///
-    /// **The two production encode loops deliberately do not call this**, and that is not an
-    /// oversight to be "fixed" by a later sweep. Both reach their exit only after the transport is
-    /// already gone (the client disconnected, or the session was stopped), so the AUs a flush would
-    /// recover have nowhere to go — while flushing is the one call on this trait that can BLOCK on a
-    /// wedged encoder, on precisely the teardown path a stopped session needs to complete promptly.
-    /// The Linux direct-SDK NVENC backend makes that concrete: its retrieve-thread join is untimed
-    /// (see the note in `enc/linux/nvenc_cuda.rs`), so a flush there could hang a session that is
-    /// already ending.
-    ///
-    /// It is kept rather than deleted because it does have real consumers: the `spike` dev
-    /// subcommand, which encodes a FINITE clip and genuinely wants the tail, and the `#[ignore]`d
-    /// hardware smoke tests across the backends, which assert the drain contract on real GPUs.
-    /// Those are finite-stream users; a live session is not one.
    fn flush(&mut self) -> Result<()>;
 }

@@ -503,17 +413,6 @@ impl Codec {
    }
 }

-/// Pixel rate (luma samples/s) at or above which NVENC split-frame encoding is FORCED 2-way —
-/// one number shared by the direct-SDK selector (`nvenc_core::resolve_split_mode`) and the libav
-/// `split_encode_mode` option author (`linux::NvencEncoder`), so the two paths can never disagree
-/// about which modes split. A single NVENC engine tops out ~1 Gpix/s on HEVC, and AUTO doesn't
-/// engage below ~2112 px height, so the sessions that need the second engine must be forced. Set
-/// BELOW 1 Gpix/s deliberately: 4K120 — the mode this threshold exists for — is 3840×2160×120 =
-/// 995,328,000, which a `> 1_000_000_000` gate missed by 0.47% and left on AUTO (pinned ~107 fps
-/// on a 4090). 950 M keeps margin for fractional refresh rates while leaving 1440p240 (884.7 M,
-/// comfortably single-engine) on AUTO.
-pub const SPLIT_FORCE_PIXEL_RATE: u64 = 950_000_000;
-
 /// `PUNKTFUNK_VBV_FRAMES` — HRD/VBV size in frame intervals (default 1.0, the strict low-latency
 /// shape every backend ships: each frame must fit its rate share, keeping frame sizes uniform for
 /// the pacer). The AMF/VAAPI/QSV paths parse the same variable locally; this helper brings the
@@ -527,35 +426,6 @@ pub(crate) fn vbv_frames_env() -> f64 {
        .unwrap_or(1.0)
 }

-/// The same HRD/VBV window as [`vbv_frames_env`], expressed the way the Vulkan Video encode API
-/// wants it: `(virtualBufferSizeInMs, initialVirtualBufferSizeInMs)`.
-///
-/// Every other backend states the window in **bits** (`bitrate / fps × frames`); Vulkan states it
-/// in **milliseconds**. `vulkan_video.rs` consumes this ONLY when the driver advertises VBR
-/// (WP6.3): a tight window under CBR makes the driver stuff underspent frames with filler NALs up
-/// to the exact rate share — measured 97 % filler on the 780M — because CBR must keep the CPB from
-/// overflowing and Vulkan exposes no filler-suppression control. VBR permits the underspend, so
-/// the tight window only ever *bounds* a complex frame.
-///
-/// The initial fill stays at half the window, preserving the RATIO the hardcoded (1000, 500)
-/// pair had — the direct-NVENC house shape uses a FULL-window initial fill instead; measured on
-/// RADV the difference is inert (the firmware showed no window sensitivity at all). Both
-/// VUIDs on `VkVideoEncodeRateControlInfoKHR`'s window fields are satisfied by construction: the
-/// window clamps to `>= 1` so it is non-zero, and `window / 2 <= window` always
-/// (`VUID-...-08358` is `<=`, relaxed in Vulkan 1.3.299).
-///
-/// Carries its only caller's gate: `vulkan_video.rs` is the sole ms-form consumer, and with the
-/// crate-wide `allow(dead_code)` gone (WP0.3) an item unused in ANY feature combination is a hard
-/// error — this is dead on every Windows leg.
-#[cfg(all(target_os = "linux", feature = "vulkan-encode"))]
-pub(crate) fn vbv_window_ms(fps: u32) -> (u32, u32) {
-    let frames = vbv_frames_env();
-    let ms = (frames * 1000.0 / fps.max(1) as f64).round();
-    // `f64 as u32` saturates at the bounds in Rust, so an absurd `PUNKTFUNK_VBV_FRAMES` cannot wrap.
-    let window = (ms as u32).max(1);
-    (window, window / 2)
-}
-
 /// Validate a requested encode resolution before we allocate buffers or open NVENC. Rejects
 /// zero/odd-sized and out-of-range modes with a clear error instead of letting buffer math
 /// overflow or the encoder open fail with an opaque NVENC code. A client can request any
@@ -584,26 +454,6 @@ pub fn validate_dimensions(codec: Codec, width: u32, height: u32) -> Result<()>
             (use HEVC/AV1 above 4096, or lower the client resolution)"
        );
    }
-    // PyroWave's vendored rate controller packs the 32×32 block index into the low 16 bits of
-    // `RDOperation::block_offset_saving` (pyrowave-sys `patches/0002-rdo-saving-clamp.patch`).
-    // Past `u16::MAX` blocks the index collides with the `saving` field, the resolve over-credits,
-    // and the emitted payload can overshoot the buffer `pyrowave_encoder_packetize` writes into —
-    // whose only bounds check is an `assert` that the Release (NDEBUG) vendored build compiles out.
-    // So this is a hard cap, not a quality knob.
-    //
-    // Checked against 4:2:0, the *most permissive* chroma: a mode that cannot fit even there can
-    // fit no PyroWave session at all, so it belongs at this single chokepoint (which both the
-    // negotiator and `open_video_backend` run) rather than only in the per-backend opens. 4:4:4
-    // has twice the block count and is checked again at open, where the real chroma is known —
-    // and the negotiator's 4:4:4 → 4:2:0 downgrade means an oversized mode arrives at the encoder
-    // as 4:2:0, which is exactly the case the old open-time guard skipped.
-    #[cfg(feature = "pyrowave")]
-    if codec == Codec::PyroWave && !crate::pyrowave_mode_fits_rdo(width, height, false) {
-        anyhow::bail!(
-            "invalid PyroWave resolution {width}x{height}: exceeds the rate controller's 16-bit \
-             block index (pyrowave-sys patches/0002) — lower the client resolution"
-        );
-    }
    Ok(())
 }

@@ -611,31 +461,6 @@ pub fn validate_dimensions(codec: Codec, width: u32, height: u32) -> Result<()>
 mod tests {
    use super::*;

-    /// WP6.3. The window VUIDs on `VkVideoEncodeRateControlInfoKHR` are the whole contract of
-    /// this helper, and both are edge cases: the window must be non-zero (a high-refresh mode
-    /// rounds a sub-1 ms window down to nothing) and the initial fill must be at most the window
-    /// (`<=` — `VUID-...-08358` was relaxed in 1.3.299). Env-free so it pins the default shape —
-    /// the scaled cases belong to whoever sets `PUNKTFUNK_VBV_FRAMES`. Carries the helper's own
-    /// cfg gate (see its note), so it runs on the Linux `vulkan-encode` leg.
-    #[cfg(all(target_os = "linux", feature = "vulkan-encode"))]
-    #[test]
-    fn vbv_window_is_about_one_frame_and_always_legal() {
-        // The house default is ~1 frame interval, not the 1000 ms the Vulkan backend hardwired.
-        assert_eq!(vbv_window_ms(60).0, 17); // 16.67 ms
-        assert_eq!(vbv_window_ms(30).0, 33);
-        assert_eq!(vbv_window_ms(240).0, 4);
-        for fps in [1, 24, 30, 60, 120, 144, 240, 480, 1000, 4000, u32::MAX] {
-            let (window, initial) = vbv_window_ms(fps);
-            assert!(window > 0, "virtualBufferSizeInMs must be > 0 (fps {fps})");
-            assert!(
-                initial <= window,
-                "initialVirtualBufferSizeInMs must be <= virtualBufferSizeInMs (fps {fps})"
-            );
-        }
-        // fps 0 must not divide by zero — `open` clamps, but the helper is called directly too.
-        assert!(vbv_window_ms(0).0 > 0);
-    }
-
    #[test]
    fn rejects_zero_and_odd_dimensions() {
        assert!(validate_dimensions(Codec::H265, 0, 1080).is_err());
@@ -652,26 +477,6 @@ mod tests {
        assert!(validate_dimensions(Codec::H264, 3840, 4098).is_err());
    }

-    /// PyroWave's hard cap is the rate controller's 16-bit block index, not just
-    /// `max_dimension()`. Checked at 4:2:0 (the most permissive chroma), because a mode that
-    /// cannot fit there cannot fit at any chroma — and because the negotiator's 4:4:4 → 4:2:0
-    /// downgrade delivers oversized modes to the encoder AS 4:2:0. HEVC/AV1 at the same
-    /// dimensions must stay unaffected.
-    #[cfg(feature = "pyrowave")]
-    #[test]
-    fn pyrowave_rejects_modes_past_the_rdo_block_index() {
-        // Fits: 8K 4:2:0 is 49125 blocks.
-        assert!(validate_dimensions(Codec::PyroWave, 7680, 4320).is_ok());
-        // Does not fit at 4:2:0 (73728 / 98304 blocks) — must be refused even though both are
-        // within `Codec::PyroWave.max_dimension()` (8192).
-        assert!(validate_dimensions(Codec::PyroWave, 8192, 6144).is_err());
-        assert!(validate_dimensions(Codec::PyroWave, 8192, 8192).is_err());
-        // The same modes remain legal for the H.26x/AV1 codecs, which have no such rate
-        // controller — the cap must not leak across codecs.
-        assert!(validate_dimensions(Codec::H265, 8192, 8192).is_ok());
-        assert!(validate_dimensions(Codec::Av1, 8192, 6144).is_ok());
-    }
-
    #[test]
    fn hevc_and_av1_allow_up_to_8192() {
        for c in [Codec::H265, Codec::Av1] {
@@ -0,0 +1,105 @@
+// Cursor-overlay blend kernels for the CUDA/NVENC path (cursor-as-metadata). The cursor bitmap is
+// straight-alpha RGBA, row-packed (stride = curW*4). Blended into the encoder-OWNED NVENC input
+// surface — never the compositor's dmabuf. One thread per cursor pixel (ARGB / YUV444) or per 2x2
+// chroma block (NV12). Coefficients are BT.709 limited, matching rgb2yuv.comp so the cursor colour
+// matches the rest of the frame regardless of which zero-copy backend encodes it.
+//
+// Build (regenerate cursor_blend.ptx after editing):
+//   nvcc -ptx -arch=compute_75 cursor_blend.cu -o cursor_blend.ptx
+// PTX is JIT'd by the driver forward to the actual GPU, so a compute_75 (Turing) baseline runs on
+// every Turing-or-newer NVENC GPU. (CUDA 13's nvcc no longer targets pre-Turing archs.)
+
+typedef unsigned char u8;
+
+__device__ __forceinline__ u8 blend8(int dst, int src, int a) {
+    return (u8)((src * a + dst * (255 - a)) / 255);
+}
+
+// Packed 4-byte surface. NVENC's ARGB format stores bytes B,G,R,A in memory; the cursor is R,G,B,A.
+extern "C" __global__ void blend_argb(
+    u8* surf, int pitch, int surfW, int surfH,
+    const u8* cur, int curW, int curH, int ox, int oy)
+{
+    int cx = blockIdx.x * blockDim.x + threadIdx.x;
+    int cy = blockIdx.y * blockDim.y + threadIdx.y;
+    if (cx >= curW || cy >= curH) return;
+    int px = ox + cx, py = oy + cy;
+    if (px < 0 || py < 0 || px >= surfW || py >= surfH) return;
+    const u8* s = cur + (size_t)(cy * curW + cx) * 4;
+    int a = s[3];
+    if (a == 0) return;
+    u8* d = surf + (size_t)py * pitch + (size_t)px * 4;
+    d[0] = blend8(d[0], s[2], a); // B <- cursor B
+    d[1] = blend8(d[1], s[1], a); // G <- cursor G
+    d[2] = blend8(d[2], s[0], a); // R <- cursor R
+}
+
+// Planar YUV444: three full-res planes stacked at base, base+plane, base+2*plane (plane=pitch*surfH).
+extern "C" __global__ void blend_yuv444(
+    u8* base, int pitch, int surfW, int surfH,
+    const u8* cur, int curW, int curH, int ox, int oy)
+{
+    int cx = blockIdx.x * blockDim.x + threadIdx.x;
+    int cy = blockIdx.y * blockDim.y + threadIdx.y;
+    if (cx >= curW || cy >= curH) return;
+    int px = ox + cx, py = oy + cy;
+    if (px < 0 || py < 0 || px >= surfW || py >= surfH) return;
+    const u8* s = cur + (size_t)(cy * curW + cx) * 4;
+    int a = s[3];
+    if (a == 0) return;
+    float R = s[0], G = s[1], B = s[2];
+    int Y = (int)(16.0f + 0.1826f * R + 0.6142f * G + 0.0620f * B + 0.5f);
+    int U = (int)(128.0f - 0.1006f * R - 0.3386f * G + 0.4392f * B + 0.5f);
+    int V = (int)(128.0f + 0.4392f * R - 0.3989f * G - 0.0403f * B + 0.5f);
+    size_t plane = (size_t)pitch * surfH;
+    u8* yp = base + (size_t)py * pitch + px;
+    u8* up = base + plane + (size_t)py * pitch + px;
+    u8* vp = base + 2 * plane + (size_t)py * pitch + px;
+    *yp = blend8(*yp, Y, a);
+    *up = blend8(*up, U, a);
+    *vp = blend8(*vp, V, a);
+}
+
+// NV12: full-res Y plane + interleaved half-res UV plane. One thread per 2x2 luma block; each blends
+// up to four Y samples and one (alpha-weighted) UV sample.
+extern "C" __global__ void blend_nv12(
+    u8* yb, int yPitch, u8* uvb, int uvPitch, int surfW, int surfH,
+    const u8* cur, int curW, int curH, int ox, int oy)
+{
+    int bx = blockIdx.x * blockDim.x + threadIdx.x;
+    int by = blockIdx.y * blockDim.y + threadIdx.y;
+    int base_cx = bx * 2, base_cy = by * 2;
+    if (base_cx >= curW || base_cy >= curH) return;
+    float ua = 0.0f, va = 0.0f, wa = 0.0f;
+    int cnt = 0;
+    for (int j = 0; j < 2; j++) {
+        for (int i = 0; i < 2; i++) {
+            int cx = base_cx + i, cy = base_cy + j;
+            if (cx >= curW || cy >= curH) continue;
+            int px = ox + cx, py = oy + cy;
+            if (px < 0 || py < 0 || px >= surfW || py >= surfH) continue;
+            const u8* s = cur + (size_t)(cy * curW + cx) * 4;
+            int a = s[3];
+            if (a == 0) continue;
+            float R = s[0], G = s[1], B = s[2];
+            int Y = (int)(16.0f + 0.1826f * R + 0.6142f * G + 0.0620f * B + 0.5f);
+            u8* yp = yb + (size_t)py * yPitch + px;
+            *yp = blend8(*yp, Y, a);
+            ua += (128.0f - 0.1006f * R - 0.3386f * G + 0.4392f * B) * a;
+            va += (128.0f + 0.4392f * R - 0.3989f * G - 0.0403f * B) * a;
+            wa += a;
+            cnt++;
+        }
+    }
+    if (wa <= 0.0f || cnt == 0) return;
+    // The chroma sample covering this block's top-left surface pixel.
+    int uvx = (ox + base_cx) / 2;
+    int uvy = (oy + base_cy) / 2;
+    if (uvx < 0 || uvy < 0 || uvx * 2 >= surfW || uvy * 2 >= surfH) return;
+    int U = (int)(ua / wa + 0.5f);
+    int V = (int)(va / wa + 0.5f);
+    int amean = (int)(wa / cnt + 0.5f);
+    u8* uv = uvb + (size_t)uvy * uvPitch + (size_t)uvx * 2;
+    uv[0] = blend8(uv[0], U, amean);
+    uv[1] = blend8(uv[1], V, amean);
+}
@@ -0,0 +1,576 @@
+//
+// Generated by NVIDIA NVVM Compiler
+//
+// Compiler Build ID: CL-38244171
+// Cuda compilation tools, release 13.3, V13.3.73
+// Based on NVVM 7.0.1
+//
+
+.version 9.3
+.target sm_75
+.address_size 64
+
+	// .globl	blend_argb
+
+.visible .entry blend_argb(
+	.param .u64 blend_argb_param_0,
+	.param .u32 blend_argb_param_1,
+	.param .u32 blend_argb_param_2,
+	.param .u32 blend_argb_param_3,
+	.param .u64 blend_argb_param_4,
+	.param .u32 blend_argb_param_5,
+	.param .u32 blend_argb_param_6,
+	.param .u32 blend_argb_param_7,
+	.param .u32 blend_argb_param_8
+)
+{
+	.reg .pred 	%p<10>;
+	.reg .b16 	%rs<2>;
+	.reg .b32 	%r<34>;
+	.reg .b64 	%rd<17>;
+
+
+	ld.param.u64 	%rd2, [blend_argb_param_0];
+	ld.param.u32 	%r5, [blend_argb_param_1];
+	ld.param.u32 	%r6, [blend_argb_param_2];
+	ld.param.u32 	%r7, [blend_argb_param_3];
+	ld.param.u64 	%rd3, [blend_argb_param_4];
+	ld.param.u32 	%r8, [blend_argb_param_5];
+	ld.param.u32 	%r11, [blend_argb_param_6];
+	ld.param.u32 	%r9, [blend_argb_param_7];
+	ld.param.u32 	%r10, [blend_argb_param_8];
+	mov.u32 	%r12, %ntid.x;
+	mov.u32 	%r13, %ctaid.x;
+	mov.u32 	%r14, %tid.x;
+	mad.lo.s32 	%r1, %r13, %r12, %r14;
+	mov.u32 	%r15, %ntid.y;
+	mov.u32 	%r16, %ctaid.y;
+	mov.u32 	%r17, %tid.y;
+	mad.lo.s32 	%r2, %r16, %r15, %r17;
+	setp.ge.s32 	%p1, %r1, %r8;
+	setp.ge.s32 	%p2, %r2, %r11;
+	or.pred  	%p3, %p1, %p2;
+	@%p3 bra 	$L__BB0_4;
+
+	add.s32 	%r3, %r1, %r9;
+	add.s32 	%r4, %r2, %r10;
+	or.b32  	%r18, %r4, %r3;
+	setp.lt.s32 	%p4, %r18, 0;
+	setp.ge.s32 	%p5, %r3, %r6;
+	or.pred  	%p6, %p5, %p4;
+	setp.ge.s32 	%p7, %r4, %r7;
+	or.pred  	%p8, %p7, %p6;
+	@%p8 bra 	$L__BB0_4;
+
+	mad.lo.s32 	%r19, %r2, %r8, %r1;
+	mul.wide.s32 	%rd4, %r19, 4;
+	cvta.to.global.u64 	%rd5, %rd3;
+	add.s64 	%rd1, %rd5, %rd4;
+	ld.global.u8 	%rs1, [%rd1+3];
+	setp.eq.s16 	%p9, %rs1, 0;
+	@%p9 bra 	$L__BB0_4;
+
+	cvt.u32.u16 	%r20, %rs1;
+	mul.wide.s32 	%rd6, %r4, %r5;
+	mul.wide.s32 	%rd7, %r3, 4;
+	add.s64 	%rd8, %rd6, %rd7;
+	cvta.to.global.u64 	%rd9, %rd2;
+	add.s64 	%rd10, %rd9, %rd8;
+	ld.global.u8 	%r21, [%rd10];
+	ld.global.u8 	%r22, [%rd1+2];
+	xor.b32  	%r23, %r20, 255;
+	mul.lo.s32 	%r24, %r23, %r21;
+	mad.lo.s32 	%r25, %r22, %r20, %r24;
+	mul.wide.u32 	%rd11, %r25, -2139062143;
+	shr.u64 	%rd12, %rd11, 39;
+	st.global.u8 	[%rd10], %rd12;
+	ld.global.u8 	%r26, [%rd10+1];
+	ld.global.u8 	%r27, [%rd1+1];
+	mul.lo.s32 	%r28, %r23, %r26;
+	mad.lo.s32 	%r29, %r27, %r20, %r28;
+	mul.wide.u32 	%rd13, %r29, -2139062143;
+	shr.u64 	%rd14, %rd13, 39;
+	st.global.u8 	[%rd10+1], %rd14;
+	ld.global.u8 	%r30, [%rd10+2];
+	ld.global.u8 	%r31, [%rd1];
+	mul.lo.s32 	%r32, %r23, %r30;
+	mad.lo.s32 	%r33, %r31, %r20, %r32;
+	mul.wide.u32 	%rd15, %r33, -2139062143;
+	shr.u64 	%rd16, %rd15, 39;
+	st.global.u8 	[%rd10+2], %rd16;
+
+$L__BB0_4:
+	ret;
+
+}
+	// .globl	blend_yuv444
+.visible .entry blend_yuv444(
+	.param .u64 blend_yuv444_param_0,
+	.param .u32 blend_yuv444_param_1,
+	.param .u32 blend_yuv444_param_2,
+	.param .u32 blend_yuv444_param_3,
+	.param .u64 blend_yuv444_param_4,
+	.param .u32 blend_yuv444_param_5,
+	.param .u32 blend_yuv444_param_6,
+	.param .u32 blend_yuv444_param_7,
+	.param .u32 blend_yuv444_param_8
+)
+{
+	.reg .pred 	%p<10>;
+	.reg .b16 	%rs<5>;
+	.reg .f32 	%f<16>;
+	.reg .b32 	%r<49>;
+	.reg .b64 	%rd<14>;
+
+
+	ld.param.u64 	%rd2, [blend_yuv444_param_0];
+	ld.param.u32 	%r5, [blend_yuv444_param_1];
+	ld.param.u32 	%r6, [blend_yuv444_param_2];
+	ld.param.u32 	%r7, [blend_yuv444_param_3];
+	ld.param.u64 	%rd3, [blend_yuv444_param_4];
+	ld.param.u32 	%r8, [blend_yuv444_param_5];
+	ld.param.u32 	%r11, [blend_yuv444_param_6];
+	ld.param.u32 	%r9, [blend_yuv444_param_7];
+	ld.param.u32 	%r10, [blend_yuv444_param_8];
+	mov.u32 	%r12, %ntid.x;
+	mov.u32 	%r13, %ctaid.x;
+	mov.u32 	%r14, %tid.x;
+	mad.lo.s32 	%r1, %r13, %r12, %r14;
+	mov.u32 	%r15, %ntid.y;
+	mov.u32 	%r16, %ctaid.y;
+	mov.u32 	%r17, %tid.y;
+	mad.lo.s32 	%r2, %r16, %r15, %r17;
+	setp.ge.s32 	%p1, %r1, %r8;
+	setp.ge.s32 	%p2, %r2, %r11;
+	or.pred  	%p3, %p1, %p2;
+	@%p3 bra 	$L__BB1_4;
+
+	add.s32 	%r3, %r1, %r9;
+	add.s32 	%r4, %r2, %r10;
+	or.b32  	%r18, %r4, %r3;
+	setp.lt.s32 	%p4, %r18, 0;
+	setp.ge.s32 	%p5, %r3, %r6;
+	or.pred  	%p6, %p5, %p4;
+	setp.ge.s32 	%p7, %r4, %r7;
+	or.pred  	%p8, %p7, %p6;
+	@%p8 bra 	$L__BB1_4;
+
+	mad.lo.s32 	%r19, %r2, %r8, %r1;
+	mul.wide.s32 	%rd4, %r19, 4;
+	cvta.to.global.u64 	%rd5, %rd3;
+	add.s64 	%rd1, %rd5, %rd4;
+	ld.global.u8 	%rs1, [%rd1+3];
+	setp.eq.s16 	%p9, %rs1, 0;
+	@%p9 bra 	$L__BB1_4;
+
+	cvt.u32.u16 	%r20, %rs1;
+	ld.global.u8 	%rs2, [%rd1];
+	cvt.rn.f32.u16 	%f1, %rs2;
+	ld.global.u8 	%rs3, [%rd1+1];
+	cvt.rn.f32.u16 	%f2, %rs3;
+	ld.global.u8 	%rs4, [%rd1+2];
+	cvt.rn.f32.u16 	%f3, %rs4;
+	fma.rn.f32 	%f4, %f1, 0f3E3AFB7F, 0f41800000;
+	fma.rn.f32 	%f5, %f2, 0f3F1D3C36, %f4;
+	fma.rn.f32 	%f6, %f3, 0f3D7DF3B6, %f5;
+	add.f32 	%f7, %f6, 0f3F000000;
+	cvt.rzi.s32.f32 	%r21, %f7;
+	fma.rn.f32 	%f8, %f1, 0fBDCE075F, 0f43000000;
+	fma.rn.f32 	%f9, %f2, 0fBEAD5CFB, %f8;
+	fma.rn.f32 	%f10, %f3, 0f3EE0DED3, %f9;
+	add.f32 	%f11, %f10, 0f3F000000;
+	cvt.rzi.s32.f32 	%r22, %f11;
+	fma.rn.f32 	%f12, %f1, 0f3EE0DED3, 0f43000000;
+	fma.rn.f32 	%f13, %f2, 0fBECC3C9F, %f12;
+	fma.rn.f32 	%f14, %f3, 0fBD25119D, %f13;
+	add.f32 	%f15, %f14, 0f3F000000;
+	cvt.rzi.s32.f32 	%r23, %f15;
+	mul.wide.s32 	%rd6, %r4, %r5;
+	cvt.s64.s32 	%rd7, %r3;
+	add.s64 	%rd8, %rd6, %rd7;
+	cvta.to.global.u64 	%rd9, %rd2;
+	add.s64 	%rd10, %rd9, %rd8;
+	ld.global.u8 	%r24, [%rd10];
+	mul.lo.s32 	%r25, %r21, %r20;
+	xor.b32  	%r26, %r20, 255;
+	mad.lo.s32 	%r27, %r26, %r24, %r25;
+	mul.hi.s32 	%r28, %r27, -2139062143;
+	add.s32 	%r29, %r28, %r27;
+	shr.u32 	%r30, %r29, 31;
+	shr.u32 	%r31, %r29, 7;
+	add.s32 	%r32, %r31, %r30;
+	st.global.u8 	[%rd10], %r32;
+	mul.wide.s32 	%rd11, %r7, %r5;
+	add.s64 	%rd12, %rd10, %rd11;
+	ld.global.u8 	%r33, [%rd12];
+	mul.lo.s32 	%r34, %r22, %r20;
+	mad.lo.s32 	%r35, %r26, %r33, %r34;
+	mul.hi.s32 	%r36, %r35, -2139062143;
+	add.s32 	%r37, %r36, %r35;
+	shr.u32 	%r38, %r37, 31;
+	shr.u32 	%r39, %r37, 7;
+	add.s32 	%r40, %r39, %r38;
+	st.global.u8 	[%rd12], %r40;
+	add.s64 	%rd13, %rd12, %rd11;
+	ld.global.u8 	%r41, [%rd13];
+	mul.lo.s32 	%r42, %r23, %r20;
+	mad.lo.s32 	%r43, %r26, %r41, %r42;
+	mul.hi.s32 	%r44, %r43, -2139062143;
+	add.s32 	%r45, %r44, %r43;
+	shr.u32 	%r46, %r45, 31;
+	shr.u32 	%r47, %r45, 7;
+	add.s32 	%r48, %r47, %r46;
+	st.global.u8 	[%rd13], %r48;
+
+$L__BB1_4:
+	ret;
+
+}
+	// .globl	blend_nv12
+.visible .entry blend_nv12(
+	.param .u64 blend_nv12_param_0,
+	.param .u32 blend_nv12_param_1,
+	.param .u64 blend_nv12_param_2,
+	.param .u32 blend_nv12_param_3,
+	.param .u32 blend_nv12_param_4,
+	.param .u32 blend_nv12_param_5,
+	.param .u64 blend_nv12_param_6,
+	.param .u32 blend_nv12_param_7,
+	.param .u32 blend_nv12_param_8,
+	.param .u32 blend_nv12_param_9,
+	.param .u32 blend_nv12_param_10
+)
+{
+	.reg .pred 	%p<43>;
+	.reg .b16 	%rs<17>;
+	.reg .f32 	%f<108>;
+	.reg .b32 	%r<123>;
+	.reg .b64 	%rd<35>;
+
+
+	ld.param.u64 	%rd11, [blend_nv12_param_0];
+	ld.param.u32 	%r21, [blend_nv12_param_1];
+	ld.param.u64 	%rd10, [blend_nv12_param_2];
+	ld.param.u32 	%r22, [blend_nv12_param_3];
+	ld.param.u32 	%r23, [blend_nv12_param_4];
+	ld.param.u32 	%r24, [blend_nv12_param_5];
+	ld.param.u64 	%rd12, [blend_nv12_param_6];
+	ld.param.u32 	%r25, [blend_nv12_param_7];
+	ld.param.u32 	%r26, [blend_nv12_param_8];
+	ld.param.u32 	%r27, [blend_nv12_param_9];
+	ld.param.u32 	%r28, [blend_nv12_param_10];
+	cvta.to.global.u64 	%rd1, %rd11;
+	cvta.to.global.u64 	%rd2, %rd12;
+	mov.u32 	%r29, %ntid.x;
+	mov.u32 	%r30, %ctaid.x;
+	mov.u32 	%r31, %tid.x;
+	mad.lo.s32 	%r32, %r30, %r29, %r31;
+	mov.u32 	%r33, %ntid.y;
+	mov.u32 	%r34, %ctaid.y;
+	mov.u32 	%r35, %tid.y;
+	mad.lo.s32 	%r36, %r34, %r33, %r35;
+	shl.b32 	%r1, %r32, 1;
+	shl.b32 	%r2, %r36, 1;
+	setp.ge.s32 	%p1, %r1, %r25;
+	setp.ge.s32 	%p2, %r2, %r26;
+	or.pred  	%p3, %p1, %p2;
+	mov.f32 	%f102, 0f00000000;
+	mov.f32 	%f103, 0f00000000;
+	mov.f32 	%f104, 0f00000000;
+	@%p3 bra 	$L__BB2_19;
+
+	cvt.s64.s32 	%rd3, %r21;
+	add.s32 	%r3, %r2, %r28;
+	setp.ge.s32 	%p4, %r3, %r24;
+	mul.lo.s32 	%r4, %r2, %r25;
+	mul.wide.s32 	%rd4, %r3, %r21;
+	add.s32 	%r5, %r1, %r27;
+	or.b32  	%r38, %r5, %r3;
+	setp.lt.s32 	%p5, %r38, 0;
+	mov.u32 	%r121, 0;
+	setp.ge.s32 	%p6, %r5, %r23;
+	or.pred  	%p7, %p6, %p5;
+	or.pred  	%p8, %p4, %p7;
+	@%p8 bra 	$L__BB2_4;
+
+	add.s32 	%r40, %r1, %r4;
+	mul.wide.s32 	%rd13, %r40, 4;
+	add.s64 	%rd5, %rd2, %rd13;
+	ld.global.u8 	%rs1, [%rd5+3];
+	setp.eq.s16 	%p9, %rs1, 0;
+	@%p9 bra 	$L__BB2_4;
+
+	cvt.u32.u16 	%r42, %rs1;
+	ld.global.u8 	%rs5, [%rd5];
+	cvt.rn.f32.u16 	%f31, %rs5;
+	ld.global.u8 	%rs6, [%rd5+1];
+	cvt.rn.f32.u16 	%f32, %rs6;
+	ld.global.u8 	%rs7, [%rd5+2];
+	cvt.rn.f32.u16 	%f33, %rs7;
+	fma.rn.f32 	%f34, %f31, 0f3E3AFB7F, 0f41800000;
+	fma.rn.f32 	%f35, %f32, 0f3F1D3C36, %f34;
+	fma.rn.f32 	%f36, %f33, 0f3D7DF3B6, %f35;
+	add.f32 	%f37, %f36, 0f3F000000;
+	cvt.rzi.s32.f32 	%r43, %f37;
+	cvt.s64.s32 	%rd14, %r5;
+	add.s64 	%rd15, %rd4, %rd14;
+	add.s64 	%rd16, %rd1, %rd15;
+	ld.global.u8 	%r44, [%rd16];
+	mul.lo.s32 	%r45, %r43, %r42;
+	xor.b32  	%r46, %r42, 255;
+	mad.lo.s32 	%r47, %r46, %r44, %r45;
+	mul.hi.s32 	%r48, %r47, -2139062143;
+	add.s32 	%r49, %r48, %r47;
+	shr.u32 	%r50, %r49, 31;
+	shr.u32 	%r51, %r49, 7;
+	add.s32 	%r52, %r51, %r50;
+	st.global.u8 	[%rd16], %r52;
+	fma.rn.f32 	%f38, %f31, 0fBDCE075F, 0f43000000;
+	fma.rn.f32 	%f39, %f32, 0fBEAD5CFB, %f38;
+	fma.rn.f32 	%f40, %f33, 0f3EE0DED3, %f39;
+	cvt.rn.f32.u16 	%f104, %rs1;
+	fma.rn.f32 	%f102, %f40, %f104, 0f00000000;
+	fma.rn.f32 	%f41, %f31, 0f3EE0DED3, 0f43000000;
+	fma.rn.f32 	%f42, %f32, 0fBECC3C9F, %f41;
+	fma.rn.f32 	%f43, %f33, 0fBD25119D, %f42;
+	fma.rn.f32 	%f103, %f43, %f104, 0f00000000;
+	mov.u32 	%r121, 1;
+
+$L__BB2_4:
+	add.s32 	%r7, %r1, 1;
+	setp.ge.s32 	%p10, %r7, %r25;
+	@%p10 bra 	$L__BB2_8;
+
+	add.s32 	%r8, %r7, %r27;
+	or.b32  	%r53, %r8, %r3;
+	setp.lt.s32 	%p12, %r53, 0;
+	setp.ge.s32 	%p13, %r8, %r23;
+	or.pred  	%p14, %p13, %p12;
+	or.pred  	%p15, %p4, %p14;
+	@%p15 bra 	$L__BB2_8;
+
+	add.s32 	%r54, %r7, %r4;
+	mul.wide.s32 	%rd17, %r54, 4;
+	add.s64 	%rd6, %rd2, %rd17;
+	ld.global.u8 	%rs2, [%rd6+3];
+	setp.eq.s16 	%p16, %rs2, 0;
+	@%p16 bra 	$L__BB2_8;
+
+	cvt.u32.u16 	%r55, %rs2;
+	ld.global.u8 	%rs8, [%rd6];
+	cvt.rn.f32.u16 	%f44, %rs8;
+	ld.global.u8 	%rs9, [%rd6+1];
+	cvt.rn.f32.u16 	%f45, %rs9;
+	ld.global.u8 	%rs10, [%rd6+2];
+	cvt.rn.f32.u16 	%f46, %rs10;
+	fma.rn.f32 	%f47, %f44, 0f3E3AFB7F, 0f41800000;
+	fma.rn.f32 	%f48, %f45, 0f3F1D3C36, %f47;
+	fma.rn.f32 	%f49, %f46, 0f3D7DF3B6, %f48;
+	add.f32 	%f50, %f49, 0f3F000000;
+	cvt.rzi.s32.f32 	%r56, %f50;
+	cvt.s64.s32 	%rd18, %r8;
+	add.s64 	%rd19, %rd4, %rd18;
+	add.s64 	%rd20, %rd1, %rd19;
+	ld.global.u8 	%r57, [%rd20];
+	mul.lo.s32 	%r58, %r56, %r55;
+	xor.b32  	%r59, %r55, 255;
+	mad.lo.s32 	%r60, %r59, %r57, %r58;
+	mul.hi.s32 	%r61, %r60, -2139062143;
+	add.s32 	%r62, %r61, %r60;
+	shr.u32 	%r63, %r62, 31;
+	shr.u32 	%r64, %r62, 7;
+	add.s32 	%r65, %r64, %r63;
+	st.global.u8 	[%rd20], %r65;
+	fma.rn.f32 	%f51, %f44, 0fBDCE075F, 0f43000000;
+	fma.rn.f32 	%f52, %f45, 0fBEAD5CFB, %f51;
+	fma.rn.f32 	%f53, %f46, 0f3EE0DED3, %f52;
+	cvt.rn.f32.u16 	%f54, %rs2;
+	fma.rn.f32 	%f102, %f53, %f54, %f102;
+	fma.rn.f32 	%f55, %f44, 0f3EE0DED3, 0f43000000;
+	fma.rn.f32 	%f56, %f45, 0fBECC3C9F, %f55;
+	fma.rn.f32 	%f57, %f46, 0fBD25119D, %f56;
+	fma.rn.f32 	%f103, %f57, %f54, %f103;
+	add.f32 	%f104, %f104, %f54;
+	add.s32 	%r121, %r121, 1;
+
+$L__BB2_8:
+	add.s32 	%r11, %r2, 1;
+	setp.ge.s32 	%p17, %r11, %r26;
+	add.s32 	%r12, %r11, %r28;
+	add.s32 	%r13, %r4, %r25;
+	cvt.s64.s32 	%rd21, %r12;
+	mul.lo.s64 	%rd7, %rd21, %rd3;
+	@%p17 bra 	$L__BB2_12;
+
+	setp.ge.s32 	%p18, %r12, %r24;
+	or.b32  	%r66, %r5, %r12;
+	setp.lt.s32 	%p19, %r66, 0;
+	or.pred  	%p21, %p6, %p19;
+	or.pred  	%p22, %p18, %p21;
+	@%p22 bra 	$L__BB2_12;
+
+	add.s32 	%r67, %r1, %r13;
+	mul.wide.s32 	%rd22, %r67, 4;
+	add.s64 	%rd8, %rd2, %rd22;
+	ld.global.u8 	%rs3, [%rd8+3];
+	setp.eq.s16 	%p23, %rs3, 0;
+	@%p23 bra 	$L__BB2_12;
+
+	cvt.u32.u16 	%r68, %rs3;
+	ld.global.u8 	%rs11, [%rd8];
+	cvt.rn.f32.u16 	%f58, %rs11;
+	ld.global.u8 	%rs12, [%rd8+1];
+	cvt.rn.f32.u16 	%f59, %rs12;
+	ld.global.u8 	%rs13, [%rd8+2];
+	cvt.rn.f32.u16 	%f60, %rs13;
+	fma.rn.f32 	%f61, %f58, 0f3E3AFB7F, 0f41800000;
+	fma.rn.f32 	%f62, %f59, 0f3F1D3C36, %f61;
+	fma.rn.f32 	%f63, %f60, 0f3D7DF3B6, %f62;
+	add.f32 	%f64, %f63, 0f3F000000;
+	cvt.rzi.s32.f32 	%r69, %f64;
+	cvt.s64.s32 	%rd23, %r5;
+	add.s64 	%rd24, %rd7, %rd23;
+	add.s64 	%rd25, %rd1, %rd24;
+	ld.global.u8 	%r70, [%rd25];
+	mul.lo.s32 	%r71, %r69, %r68;
+	xor.b32  	%r72, %r68, 255;
+	mad.lo.s32 	%r73, %r72, %r70, %r71;
+	mul.hi.s32 	%r74, %r73, -2139062143;
+	add.s32 	%r75, %r74, %r73;
+	shr.u32 	%r76, %r75, 31;
+	shr.u32 	%r77, %r75, 7;
+	add.s32 	%r78, %r77, %r76;
+	st.global.u8 	[%rd25], %r78;
+	fma.rn.f32 	%f65, %f58, 0fBDCE075F, 0f43000000;
+	fma.rn.f32 	%f66, %f59, 0fBEAD5CFB, %f65;
+	fma.rn.f32 	%f67, %f60, 0f3EE0DED3, %f66;
+	cvt.rn.f32.u16 	%f68, %rs3;
+	fma.rn.f32 	%f102, %f67, %f68, %f102;
+	fma.rn.f32 	%f69, %f58, 0f3EE0DED3, 0f43000000;
+	fma.rn.f32 	%f70, %f59, 0fBECC3C9F, %f69;
+	fma.rn.f32 	%f71, %f60, 0fBD25119D, %f70;
+	fma.rn.f32 	%f103, %f71, %f68, %f103;
+	add.f32 	%f104, %f104, %f68;
+	add.s32 	%r121, %r121, 1;
+
+$L__BB2_12:
+	or.pred  	%p26, %p17, %p10;
+	@%p26 bra 	$L__BB2_16;
+
+	setp.ge.s32 	%p27, %r12, %r24;
+	add.s32 	%r16, %r7, %r27;
+	or.b32  	%r79, %r16, %r12;
+	setp.lt.s32 	%p28, %r79, 0;
+	setp.ge.s32 	%p29, %r16, %r23;
+	or.pred  	%p30, %p29, %p28;
+	or.pred  	%p31, %p27, %p30;
+	@%p31 bra 	$L__BB2_16;
+
+	add.s32 	%r80, %r7, %r13;
+	mul.wide.s32 	%rd26, %r80, 4;
+	add.s64 	%rd9, %rd2, %rd26;
+	ld.global.u8 	%rs4, [%rd9+3];
+	setp.eq.s16 	%p32, %rs4, 0;
+	@%p32 bra 	$L__BB2_16;
+
+	cvt.u32.u16 	%r81, %rs4;
+	ld.global.u8 	%rs14, [%rd9];
+	cvt.rn.f32.u16 	%f72, %rs14;
+	ld.global.u8 	%rs15, [%rd9+1];
+	cvt.rn.f32.u16 	%f73, %rs15;
+	ld.global.u8 	%rs16, [%rd9+2];
+	cvt.rn.f32.u16 	%f74, %rs16;
+	fma.rn.f32 	%f75, %f72, 0f3E3AFB7F, 0f41800000;
+	fma.rn.f32 	%f76, %f73, 0f3F1D3C36, %f75;
+	fma.rn.f32 	%f77, %f74, 0f3D7DF3B6, %f76;
+	add.f32 	%f78, %f77, 0f3F000000;
+	cvt.rzi.s32.f32 	%r82, %f78;
+	cvt.s64.s32 	%rd27, %r16;
+	add.s64 	%rd28, %rd7, %rd27;
+	add.s64 	%rd29, %rd1, %rd28;
+	ld.global.u8 	%r83, [%rd29];
+	mul.lo.s32 	%r84, %r82, %r81;
+	xor.b32  	%r85, %r81, 255;
+	mad.lo.s32 	%r86, %r85, %r83, %r84;
+	mul.hi.s32 	%r87, %r86, -2139062143;
+	add.s32 	%r88, %r87, %r86;
+	shr.u32 	%r89, %r88, 31;
+	shr.u32 	%r90, %r88, 7;
+	add.s32 	%r91, %r90, %r89;
+	st.global.u8 	[%rd29], %r91;
+	fma.rn.f32 	%f79, %f72, 0fBDCE075F, 0f43000000;
+	fma.rn.f32 	%f80, %f73, 0fBEAD5CFB, %f79;
+	fma.rn.f32 	%f81, %f74, 0f3EE0DED3, %f80;
+	cvt.rn.f32.u16 	%f82, %rs4;
+	fma.rn.f32 	%f102, %f81, %f82, %f102;
+	fma.rn.f32 	%f83, %f72, 0f3EE0DED3, 0f43000000;
+	fma.rn.f32 	%f84, %f73, 0fBECC3C9F, %f83;
+	fma.rn.f32 	%f85, %f74, 0fBD25119D, %f84;
+	fma.rn.f32 	%f103, %f85, %f82, %f103;
+	add.f32 	%f104, %f104, %f82;
+	add.s32 	%r121, %r121, 1;
+
+$L__BB2_16:
+	setp.eq.s32 	%p33, %r121, 0;
+	setp.le.f32 	%p34, %f104, 0f00000000;
+	or.pred  	%p35, %p34, %p33;
+	@%p35 bra 	$L__BB2_19;
+
+	shr.u32 	%r92, %r5, 31;
+	add.s32 	%r93, %r5, %r92;
+	shr.s32 	%r19, %r93, 1;
+	setp.lt.s32 	%p36, %r3, -1;
+	setp.lt.s32 	%p37, %r5, -1;
+	or.pred  	%p38, %p37, %p36;
+	and.b32  	%r94, %r93, -2;
+	setp.ge.s32 	%p39, %r94, %r23;
+	or.pred  	%p40, %p38, %p39;
+	shr.u32 	%r95, %r3, 31;
+	add.s32 	%r96, %r3, %r95;
+	shr.s32 	%r20, %r96, 1;
+	and.b32  	%r97, %r96, -2;
+	setp.ge.s32 	%p41, %r97, %r24;
+	or.pred  	%p42, %p40, %p41;
+	@%p42 bra 	$L__BB2_19;
+
+	div.rn.f32 	%f86, %f102, %f104;
+	add.f32 	%f87, %f86, 0f3F000000;
+	cvt.rzi.s32.f32 	%r98, %f87;
+	div.rn.f32 	%f88, %f103, %f104;
+	add.f32 	%f89, %f88, 0f3F000000;
+	cvt.rzi.s32.f32 	%r99, %f89;
+	cvt.rn.f32.s32 	%f90, %r121;
+	div.rn.f32 	%f91, %f104, %f90;
+	add.f32 	%f92, %f91, 0f3F000000;
+	cvt.rzi.s32.f32 	%r100, %f92;
+	mul.wide.s32 	%rd30, %r20, %r22;
+	mul.wide.s32 	%rd31, %r19, 2;
+	add.s64 	%rd32, %rd30, %rd31;
+	cvta.to.global.u64 	%rd33, %rd10;
+	add.s64 	%rd34, %rd33, %rd32;
+	ld.global.u8 	%r101, [%rd34];
+	mul.lo.s32 	%r102, %r100, %r98;
+	mov.u32 	%r103, 255;
+	sub.s32 	%r104, %r103, %r100;
+	mad.lo.s32 	%r105, %r104, %r101, %r102;
+	mul.hi.s32 	%r106, %r105, -2139062143;
+	add.s32 	%r107, %r106, %r105;
+	shr.u32 	%r108, %r107, 31;
+	shr.u32 	%r109, %r107, 7;
+	add.s32 	%r110, %r109, %r108;
+	st.global.u8 	[%rd34], %r110;
+	ld.global.u8 	%r111, [%rd34+1];
+	mul.lo.s32 	%r112, %r100, %r99;
+	mad.lo.s32 	%r113, %r104, %r111, %r112;
+	mul.hi.s32 	%r114, %r113, -2139062143;
+	add.s32 	%r115, %r114, %r113;
+	shr.u32 	%r116, %r115, 31;
+	shr.u32 	%r117, %r115, 7;
+	add.s32 	%r118, %r117, %r116;
+	st.global.u8 	[%rd34+1], %r118;
+
+$L__BB2_19:
+	ret;
+
+}
+
@@ -66,11 +66,6 @@ struct CudaHw {

 impl CudaHw {
    /// Build a CUDA hwdevice wrapping `cu_ctx` and a frames pool (`sw_format` = `pixel`).
-    ///
-    /// The `bail!`s below format raw AVERROR ints eagerly BY DESIGN — do not convert them to
-    /// typed errors: `open_nvenc_probed`'s bitrate ladder steps down on a typed EINVAL
-    /// (`nvenc_open_einval`), and a hwdevice/hwframes EINVAL is a config error no bitrate can
-    /// fix — enrolling it would burn ~10 doomed encoder opens before surfacing the real failure.
    unsafe fn new(cu_ctx: *mut std::ffi::c_void, sw_format: Pixel, w: u32, h: u32) -> Result<Self> {
        let mut device_ref = ffi::av_hwdevice_ctx_alloc(ffi::AVHWDeviceType::AV_HWDEVICE_TYPE_CUDA);
        if device_ref.is_null() {
@@ -185,6 +180,7 @@ pub struct NvencEncoder {
    /// This session opened as full-chroma 4:4:4 (FREXT) — via either input path.
    want_444: bool,
    src_format: PixelFormat,
+    expand: bool,
    width: u32,
    height: u32,
    fps: u32,
@@ -417,6 +413,57 @@ impl NvencEncoder {
            None
        };

+        // CPU CSC paths: build the packed-RGB → planar swscale (no rescale) into the encoder's
+        // input frame. Two users: 4:4:4 (RGB→YUV444P, BT.709, range per the flag) and HDR
+        // (X2RGB10/X2BGR10→P010, BT.2020 limited — the PQ transfer is per-channel and rides
+        // through the matrix untouched). Skipped on the zero-copy path (`cuda`): the worker's GPU
+        // convert already delivers ready CUDA frames — no CPU pixels exist to scale.
+        let sws_csc = if (want_444 || want_hdr10) && !cuda {
+            let src_av = pixel_to_av(sws_src_pixel(format)?);
+            let dst_av = pixel_to_av(nvenc_pixel);
+            // SAFETY: `sws_getContext` allocates a swscale context for the given src/dst dims + pixel
+            // formats. Both dims are the encoder's positive `width`/`height` as `c_int`; `src_av` is a
+            // valid `AVPixelFormat` (from the `sws_src_pixel`-validated packed-RGB source), the dst is
+            // YUV444P (4:4:4) or P010LE (HDR). The trailing filter/param pointers are null = "use
+            // defaults" (documented as accepted). No Rust memory is borrowed; the returned pointer is
+            // null-checked below.
+            let sws = unsafe {
+                ffi::sws_getContext(
+                    width as c_int,
+                    height as c_int,
+                    src_av,
+                    width as c_int,
+                    height as c_int,
+                    dst_av,
+                    SWS_POINT,
+                    ptr::null_mut(),
+                    ptr::null_mut(),
+                    ptr::null(),
+                )
+            };
+            if sws.is_null() {
+                bail!("sws_getContext(RGB→{nvenc_pixel:?}) failed");
+            }
+            // SAFETY: `sws` is the non-null context from the call above (null-checked). The
+            // coefficient tables from `sws_getCoefficients` (ITU-709 for 4:4:4, BT.2020 NCL for HDR
+            // — matching the VUI written above) are process-lifetime libswscale statics, reused for
+            // src+dst matrices; `sws_setColorspaceDetails` only reads them and writes scalar CSC
+            // settings into `sws` (dstRange matches the VUI: 0 = limited, 1 = the
+            // PUNKTFUNK_444_FULLRANGE experiment; HDR is always limited). No Rust memory is passed.
+            unsafe {
+                let cs = ffi::sws_getCoefficients(if want_hdr10 {
+                    super::libav::SWS_CS_BT2020
+                } else {
+                    SWS_CS_ITU709
+                });
+                let dst_range = i32::from(full_range_444);
+                ffi::sws_setColorspaceDetails(sws, cs, 1, cs, dst_range, 0, 1 << 16, 1 << 16);
+            }
+            Some(sws)
+        } else {
+            None
+        };
+
        // Low-latency NVENC tuning (plan §7 / linux-setup doc).
        let mut opts = Dictionary::new();
        opts.set("preset", "p1"); // fastest
@@ -444,29 +491,15 @@ impl NvencEncoder {
        }

        // Split-frame encode across both NVENC engines (GB203 has 2) when the pixel rate exceeds
-        // a single engine's HEVC capacity; e.g. 5120x1440@240 = 1.77 Gpix/s needs it, @120
-        // (0.88 Gpix/s) does not. HEVC/AV1 only (not H.264). AUTO won't engage below ~2112px
+        // a single engine's HEVC capacity (~1 Gpix/s); e.g. 5120x1440@240 = 1.77 Gpix/s needs it,
+        // @120 = 0.88 Gpix/s does not. HEVC/AV1 only (not H.264). AUTO won't engage below ~2112px
        // height, so we force `2`; below the threshold we leave it AUTO (split costs ~2% BD-rate).
-        // Threshold shared with the direct-SDK selector ([`super::SPLIT_FORCE_PIXEL_RATE`] — set
-        // so 4K120 = 995.3 Mpix/s forces, which `> 1e9` famously missed by 0.47%). Output is
-        // standard HEVC — transparent to the client. Override with PUNKTFUNK_SPLIT_ENCODE.
+        // Output is standard HEVC — transparent to the client. Override with PUNKTFUNK_SPLIT_ENCODE.
        let pix_rate = width as u64 * height as u64 * fps as u64;
        let split = std::env::var("PUNKTFUNK_SPLIT_ENCODE").ok();
        match split.as_deref() {
-            // The operator arm gains the codec gate the auto arm always had (Phase 8): split
-            // "is not applicable to H264" per nvEncodeAPI.h, and h264_nvenc has no such AVOption
-            // — setting it would fail the open on a leftover dict entry.
-            Some(mode) if matches!(codec, Codec::H265 | Codec::Av1) => {
-                opts.set("split_encode_mode", mode)
-            }
-            Some(_) => tracing::warn!(
-                codec = codec.nvenc_name(),
-                "PUNKTFUNK_SPLIT_ENCODE ignored — split encoding is not applicable to H.264 \
-                 (nvEncodeAPI.h)"
-            ),
-            None if matches!(codec, Codec::H265 | Codec::Av1)
-                && pix_rate >= super::SPLIT_FORCE_PIXEL_RATE =>
-            {
+            Some(mode) => opts.set("split_encode_mode", mode),
+            None if matches!(codec, Codec::H265 | Codec::Av1) && pix_rate > 1_000_000_000 => {
                opts.set("split_encode_mode", "2");
                tracing::info!(
                    pix_rate,
@@ -483,15 +516,7 @@ impl NvencEncoder {
            // sessions) and reopen this session without intra-refresh; any other failure — and
            // any failure when IR wasn't requested — propagates untouched (the bitrate probe
            // keys on EINVAL, which must not trip the latch).
-            Err(e)
-                if intra_refresh
-                    && matches!(
-                        e,
-                        ffmpeg::Error::Other {
-                            errno: ffmpeg::util::error::ENOSYS
-                        }
-                    ) =>
-            {
+            Err(e) if intra_refresh && format!("{e:#}").contains("Function not implemented") => {
                tracing::warn!(
                    encoder = name,
                    "NVENC intra-refresh not supported by this GPU — falling back to IDR-only \
@@ -524,84 +549,6 @@ impl NvencEncoder {
            );
        }

-        // Built HERE, below the fallible encoder open, NOT above it. `sws_getContext` returns a raw
-        // pointer whose only free is `Drop for NvencEncoder` — and `Drop` needs a CONSTRUCTED
-        // `Self`, which does not exist on `open`'s early returns (the intra-refresh-unsupported
-        // retry, which recurses into `Self::open`, and the plain error return). Creating the
-        // context above them leaked one per failed attempt, and `open_nvenc_probed`'s EINVAL
-        // bitrate ladder calls `open` up to ~10 times, so a host stepping its bitrate down leaked a
-        // context per step. Nothing between here and the `Ok(NvencEncoder { … })` below can return,
-        // so this placement makes the leak unrepresentable rather than merely unlikely.
-        // CPU CSC paths: build the packed-RGB → planar swscale (no rescale) into the encoder's
-        // input frame. THREE users: 4:4:4 (RGB→YUV444P, BT.709, range per the flag), HDR
-        // (X2RGB10/X2BGR10→P010, BT.2020 limited — the PQ transfer is per-channel and rides
-        // through the matrix untouched), and the packed 3-bpp expand (RGB24/BGR24→rgb0/bgr0).
-        //
-        // The expand used to be a hand-written per-pixel loop in `submit_cpu`: `w*h` iterations,
-        // each building two bounds-checked sub-slices for a 3-byte copy — a shape LLVM will not
-        // vectorise into the byte shuffle it is, on the COMMON CPU path (the portal and wlroots
-        // both commonly fixate packed 24-bit RGB, and pf-capture offers it first). swscale's
-        // packed-RGB expanders are SIMD, the sibling VAAPI backend already routes RGB24/BGR24
-        // through them, and this file already owned the context lifecycle — so the change is net
-        // subtractive. The three are mutually exclusive by construction: `expand` is only ever
-        // true on the packed-RGB 4:2:0 path (see `nvenc_pixel`/`expand` above), never with
-        // `want_444`, so one context serves whichever applies.
-        //
-        // Skipped on the zero-copy path (`cuda`): the worker's GPU convert already delivers ready
-        // CUDA frames — no CPU pixels exist to scale.
-        let sws_csc = if (want_444 || want_hdr10 || expand) && !cuda {
-            let src_av = pixel_to_av(sws_src_pixel(format)?);
-            let dst_av = pixel_to_av(nvenc_pixel);
-            // SAFETY: `sws_getContext` allocates a swscale context for the given src/dst dims + pixel
-            // formats. Both dims are the encoder's positive `width`/`height` as `c_int`; `src_av` is a
-            // valid `AVPixelFormat` (from the `sws_src_pixel`-validated packed-RGB source), the dst is
-            // YUV444P (4:4:4) or P010LE (HDR). The trailing filter/param pointers are null = "use
-            // defaults" (documented as accepted). No Rust memory is borrowed; the returned pointer is
-            // null-checked below.
-            let sws = unsafe {
-                ffi::sws_getContext(
-                    width as c_int,
-                    height as c_int,
-                    src_av,
-                    width as c_int,
-                    height as c_int,
-                    dst_av,
-                    SWS_POINT,
-                    ptr::null_mut(),
-                    ptr::null_mut(),
-                    ptr::null(),
-                )
-            };
-            if sws.is_null() {
-                bail!("sws_getContext(RGB→{nvenc_pixel:?}) failed");
-            }
-            // Colour math applies to the CSC users ONLY. The expand is a pure byte shuffle —
-            // packed 3-bpp RGB/BGR to the same channels in 4 bytes, `nvenc_pixel` being `rgb0`/
-            // `bgr0` — and NVENC does the RGB→YUV itself downstream. Handing it a matrix + range
-            // here would silently range-convert every packed-RGB session, which is exactly what the
-            // module header promises does not happen ("no colour math").
-            if want_444 || want_hdr10 {
-                // SAFETY: `sws` is the non-null context from the call above (null-checked). The
-                // coefficient tables from `sws_getCoefficients` (ITU-709 for 4:4:4, BT.2020 NCL for
-                // HDR — matching the VUI written above) are process-lifetime libswscale statics,
-                // reused for src+dst matrices; `sws_setColorspaceDetails` only reads them and writes
-                // scalar CSC settings into `sws` (dstRange matches the VUI: 0 = limited, 1 = the
-                // PUNKTFUNK_444_FULLRANGE experiment; HDR is always limited). No Rust memory is passed.
-                unsafe {
-                    let cs = ffi::sws_getCoefficients(if want_hdr10 {
-                        super::libav::SWS_CS_BT2020
-                    } else {
-                        SWS_CS_ITU709
-                    });
-                    let dst_range = i32::from(full_range_444);
-                    ffi::sws_setColorspaceDetails(sws, cs, 1, cs, dst_range, 0, 1 << 16, 1 << 16);
-                }
-            }
-            Some(sws)
-        } else {
-            None
-        };
-
        let frame = if cuda {
            None
        } else {
@@ -614,6 +561,7 @@ impl NvencEncoder {
            sws_csc,
            want_444,
            src_format: format,
+            expand,
            width,
            height,
            fps,
@@ -643,9 +591,6 @@ impl NvencEncoder {
 impl Encoder for NvencEncoder {
    fn caps(&self) -> super::EncoderCaps {
        super::EncoderCaps {
-            // libav NVENC hands the frame straight to the encoder — `frame.cursor` is never read,
-            // so a cursor-as-metadata session loses its pointer on this backend (audit finding).
-            blends_cursor: false,
            // 4:4:4 iff this session opened FREXT — the CPU swscale path or the zero-copy GPU
            // convert. RFI/HDR-SEI stay unsupported on libavcodec NVENC (the trait defaults).
            chroma_444: self.want_444,
@@ -750,10 +695,8 @@ impl NvencEncoder {
            bytes.len(),
            src_row * h
        );
-        // swscale the packed RGB straight into the encoder's input frame, then send it. Serves all
-        // three CSC users (see `open`): 4:4:4 → planar YUV444P, HDR → P010, and the packed 3-bpp
-        // expand → `rgb0`/`bgr0`. The remaining branch below is the 4-bpp source, which needs no
-        // conversion at all — just a row copy honouring the destination stride.
+        // 4:4:4: swscale the packed RGB straight into the planar YUV444P input frame (BT.709 limited),
+        // then send it — no byte-expand. The 4:2:0 RGB path (below) feeds NVENC packed RGB directly.
        if let Some(sws) = self.sws_csc {
            let frame = self
                .frame
@@ -762,13 +705,10 @@ impl NvencEncoder {
            // SAFETY: `format == self.src_format` and `bytes.len() >= src_row * h` (the `ensure!`s
            // above), so `sws_scale` reads `h` rows of `src_row` bytes from `src_data[0] = bytes`
            // (packed RGB is single-plane; the other src planes are null/0) — all in bounds. `sws` is
-            // the non-null context built in `open`. The dst is `frame`'s underlying `AVFrame`, whose
-            // `data`/`linesize` in-struct arrays were sized by `VideoFrame::new` for the very
-            // `nvenc_pixel` this context was built to output — 3 planes of `width`×`height` for
-            // YUV444P, 2 for P010, 1 packed plane for `rgb0`/`bgr0` — so swscale writes exactly the
-            // planes it allocated, at the strides it reports. All pointers are live locals for this
-            // synchronous call; the encoder runs only on this thread (`unsafe impl Send`), so no
-            // aliasing/race.
+            // the non-null context built in `open`. The dst is `frame`'s underlying `AVFrame`: its
+            // `data`/`linesize` in-struct arrays were sized for YUV444P by `VideoFrame::new`, and the
+            // 3 planes are each `width`×`height`. All pointers are live locals for this synchronous
+            // call; the encoder runs only on this thread (`unsafe impl Send`), so no aliasing/race.
            unsafe {
                let dst_av = frame.as_mut_ptr();
                let src_data: [*const u8; 4] =
@@ -784,7 +724,7 @@ impl NvencEncoder {
                    (*dst_av).linesize.as_ptr(),
                );
                if r < 0 {
-                    bail!("sws_scale(CPU CSC → encoder input) failed ({r})");
+                    bail!("sws_scale(RGB→YUV444P) failed ({r})");
                }
            }
            frame.set_pts(Some(pts));
@@ -793,7 +733,7 @@ impl NvencEncoder {
            } else {
                ffmpeg::picture::Type::None
            });
-            self.enc.send_frame(frame).context("send_frame(swscale)")?;
+            self.enc.send_frame(frame).context("send_frame(444)")?;
            return Ok(());
        }
        let frame = self
@@ -802,9 +742,18 @@ impl NvencEncoder {
            .context("CPU frame missing (encoder opened in CUDA mode)")?;
        let stride = frame.stride(0); // dst is 4-bpp, aligned
        let dst = frame.data_mut(0);
-        {
-            // 4-bpp → 4-bpp, honoring the (possibly larger) dst stride. The 3-bpp expand that used
-            // to live here as a per-pixel loop is now swscale's job (see the branch above).
+        if self.expand {
+            // packed 3-bpp RGB/BGR → 4-bpp *0 (copy 3 bytes, zero the pad byte)
+            for y in 0..h {
+                let s = &bytes[y * src_row..y * src_row + src_row];
+                let drow = &mut dst[y * stride..y * stride + w * 4];
+                for x in 0..w {
+                    drow[x * 4..x * 4 + 3].copy_from_slice(&s[x * 3..x * 3 + 3]);
+                    drow[x * 4 + 3] = 0;
+                }
+            }
+        } else {
+            // 4-bpp → 4-bpp, honoring the (possibly larger) dst stride
            for y in 0..h {
                dst[y * stride..y * stride + src_row]
                    .copy_from_slice(&bytes[y * src_row..y * src_row + src_row]);
@@ -927,58 +876,6 @@ impl Drop for NvencEncoder {
    }
 }

-/// Serialises the save → `AV_LOG_FATAL` → restore window that every capability probe opens around
-/// an encoder open it *expects* to fail.
-///
-/// libav's log level is one process-global `int`, and the probes race each other for real: the
-/// NVENC and VAAPI 4:4:4/10-bit probes are reached from `/serverinfo` and from session bring-up.
-/// Two overlapping save/restore pairs interleave as get(INFO) → get(FATAL) → set(INFO) →
-/// set(FATAL), and the process is then pinned at `AV_LOG_FATAL` for good — every later libav
-/// diagnostic silently dropped, which is precisely the logging you want when a stream later fails
-/// to open. The probes run process-once and already cost a real encoder open, so serialising them
-/// costs nothing measurable.
-static LIBAV_LOG_LEVEL: std::sync::Mutex<()> = std::sync::Mutex::new(());
-
-/// RAII quiet-window over libav's global log level: drops it to `AV_LOG_FATAL` on construction and
-/// restores the previous level on drop, holding [`LIBAV_LOG_LEVEL`] for the whole window.
-///
-/// Callers must have completed `ffmpeg::init()` first. Not re-entrant — no probe may construct a
-/// second guard while holding one (none do; the probe bodies only reach encoder-open helpers).
-/// `pub(crate)` so the VAAPI probes share the one lock: they race the NVENC probes on the same
-/// global.
-pub(crate) struct QuietLibavLog {
-    prev: c_int,
-    // Held for the lifetime of the guard. `Drop for QuietLibavLog` runs before the struct's fields
-    // are dropped, so the restore below still happens under the lock.
-    _lock: std::sync::MutexGuard<'static, ()>,
-}
-
-impl QuietLibavLog {
-    pub(crate) fn new() -> Self {
-        // Poison-tolerant: a probe that panicked mid-window already restored the level via `Drop`,
-        // and refusing the lock forever afterwards would be a worse outcome than proceeding.
-        let lock = LIBAV_LOG_LEVEL
-            .lock()
-            .unwrap_or_else(|poisoned| poisoned.into_inner());
-        // SAFETY: libav is initialized by the caller; `av_log_{get,set}_level` only read/write the
-        // global int level (no pointer args) and are always sound post-init.
-        let prev = unsafe {
-            let p = ffi::av_log_get_level();
-            ffi::av_log_set_level(ffi::AV_LOG_FATAL);
-            p
-        };
-        Self { prev, _lock: lock }
-    }
-}
-
-impl Drop for QuietLibavLog {
-    fn drop(&mut self) {
-        // SAFETY: restore the saved global level (scalar arg, no pointers); libav was initialized
-        // before this guard was constructed.
-        unsafe { ffi::av_log_set_level(self.prev) };
-    }
-}
-
 /// Probe whether this NVIDIA GPU + driver + libavcodec can actually encode HEVC **4:4:4** (Range
 /// Extensions). Opens a tiny real `hevc_nvenc` 4:4:4 session — the exact path [`NvencEncoder::open`]
 /// takes for a live 4:4:4 stream — and reports whether it succeeded. HEVC-only; the result is cached
@@ -992,9 +889,14 @@ pub fn probe_can_encode_444(codec: Codec) -> bool {
        return false;
    }
    // Quiet ffmpeg's open error on a GPU that lacks 4:4:4 — the probe failing is an expected outcome.
-    // Held until the function returns, so the level is restored after the open either way.
-    let _quiet = QuietLibavLog::new();
-    NvencEncoder::open(
+    // SAFETY: libav initialized above; `av_log_{get,set}_level` only read/write the global int level
+    // (no pointer args) and are always sound post-init.
+    let prev = unsafe {
+        let p = ffi::av_log_get_level();
+        ffi::av_log_set_level(ffi::AV_LOG_FATAL);
+        p
+    };
+    let ok = NvencEncoder::open(
        codec,
        PixelFormat::Bgra,
        640,
@@ -1005,7 +907,10 @@ pub fn probe_can_encode_444(codec: Codec) -> bool {
        8,
        ChromaFormat::Yuv444,
    )
-    .is_ok()
+    .is_ok();
+    // SAFETY: restore the saved global log level (scalar arg, no pointers).
+    unsafe { ffi::av_log_set_level(prev) };
+    ok
 }

 /// Probe whether this NVIDIA GPU + driver + libavcodec can actually encode 10-bit (HEVC Main10 /
@@ -1021,9 +926,14 @@ pub fn probe_can_encode_10bit(codec: Codec) -> bool {
        return false;
    }
    // Quiet ffmpeg's open error on a GPU that lacks 10-bit — the probe failing is an expected outcome.
-    // Held until the function returns, so the level is restored after the open either way.
-    let _quiet = QuietLibavLog::new();
-    NvencEncoder::open(
+    // SAFETY: libav initialized above; `av_log_{get,set}_level` only read/write the global int level
+    // (no pointer args) and are always sound post-init.
+    let prev = unsafe {
+        let p = ffi::av_log_get_level();
+        ffi::av_log_set_level(ffi::AV_LOG_FATAL);
+        p
+    };
+    let ok = NvencEncoder::open(
        codec,
        PixelFormat::X2Rgb10,
        640,
@@ -1034,7 +944,10 @@ pub fn probe_can_encode_10bit(codec: Codec) -> bool {
        10,
        ChromaFormat::Yuv420,
    )
-    .is_ok()
+    .is_ok();
+    // SAFETY: restore the saved global log level (scalar arg, no pointers).
+    unsafe { ffi::av_log_set_level(prev) };
+    ok
 }

 #[cfg(test)]
@@ -28,18 +28,22 @@ use ffmpeg::format::Pixel;
 use ffmpeg::{codec, encoder, Dictionary};
 use ffmpeg_next as ffmpeg;
 use pf_frame::{CapturedFrame, DmabufFrame, FramePayload, PixelFormat};
-use std::collections::HashMap;
 use std::ffi::{CStr, CString};
 use std::os::fd::AsRawFd;
 use std::os::raw::c_int;
 use std::ptr;
-use std::sync::{Mutex, OnceLock};
+use std::sync::atomic::{AtomicU8, Ordering};

 use super::libav::{
    apply_low_latency_rc, pixel_to_av, poll_encoder, PollOutcome, SWS_CS_ITU709, SWS_POINT,
 };
 use ffmpeg::ffi; // = ffmpeg_sys_next

+/// `fourcc(a,b,c,d)` — DRM FourCC packing (`a | b<<8 | c<<16 | d<<24`).
+const fn fourcc(a: u8, b: u8, c: u8, d: u8) -> u32 {
+    (a as u32) | ((b as u32) << 8) | ((c as u32) << 16) | ((d as u32) << 24)
+}
+
 /// The render node a VAAPI/DRM device should open, from [`pf_gpu::linux_render_node`]: a
 /// matched web-console GPU preference pins it, else `PUNKTFUNK_RENDER_NODE`, else the single-GPU
 /// default.
@@ -67,179 +71,33 @@ fn vaapi_sws_src(format: PixelFormat) -> Result<Pixel> {
    })
 }

-/// Which VAAPI entrypoint mode opened successfully: 1 = default (full-feature `EncSlice`),
-/// 2 = low-power (`EncSliceLP`/VDEnc). Modern Intel (Gen12+/Arc) removed the full-feature encode
-/// entrypoints, so the default open fails there and only `low_power=1` works; AMD (radeonsi) is the
-/// reverse. Caching the resolved mode lets later sessions/probes skip the known-failing attempt
-/// (and its libav error spew).
-///
-/// Keyed on **(render node, codec, bit depth)**, and every part of that key is load-bearing:
-///
-/// * The render node, because the entrypoint is a property of the DEVICE libva opens — and
-///   `render_node()` follows the web-console GPU preference. This used to be a process-global array
-///   keyed by codec alone, which made it a session-killer rather than a staleness bug: once a mode
-///   is latched the open tries exactly ONE mode and the `[false, true]` fallback is gone. Latch
-///   low-power on an Intel Arc, switch the preference to an AMD dGPU, and every VAAPI open there
-///   passes `low_power=1` — which radeonsi rejects — with no full-feature retry, for the process
-///   lifetime: the probe reports all-false AND the session's own encoder open fails.
-///   Keyed on the node rather than `pf_gpu::selection_key()` on purpose — the node is literally what
-///   `render_node()` hands libva, so key and device cannot describe different GPUs.
-/// * The bit depth, because Main10 and 8-bit can resolve to different entrypoints on the same
-///   device; one shared slot let an 8-bit answer pin the 10-bit open (HDR under-advertisement).
-static LP_MODE: OnceLock<Mutex<HashMap<LpKey, u8>>> = OnceLock::new();
+/// Which VAAPI entrypoint mode opened successfully, cached per codec (index = [`lp_idx`]):
+/// 0 = unknown, 1 = default (full-feature `EncSlice`), 2 = low-power (`EncSliceLP`/VDEnc).
+/// Modern Intel (Gen12+/Arc) removed the full-feature encode entrypoints, so the default open
+/// fails there and only `low_power=1` works; AMD (radeonsi) is the reverse. Caching the resolved
+/// mode lets later sessions/probes skip the known-failing attempt (and its libav error spew).
+static LP_MODE: [AtomicU8; 3] = [AtomicU8::new(0), AtomicU8::new(0), AtomicU8::new(0)];

-/// (render-node path, codec label, 10-bit) — see [`LP_MODE`].
-type LpKey = (String, &'static str, bool);
-
-/// The [`LP_MODE`] key for this device/codec/depth. `render_node()` is re-read rather than cached
-/// so a GPU-preference change is picked up on the next open.
-fn lp_key(codec: Codec, ten_bit: bool) -> LpKey {
-    lp_key_for(&render_node().to_string_lossy(), codec, ten_bit)
-}
-
-/// [`lp_key`] with the render node explicit (device-free for the unit tests). Every part of the
-/// key is load-bearing — see [`LP_MODE`] for the two field-motivated bugs (node: cross-GPU
-/// session-killer; depth: HDR under-advertisement).
-fn lp_key_for(node: &str, codec: Codec, ten_bit: bool) -> LpKey {
-    (node.to_owned(), codec.label(), ten_bit)
+fn lp_idx(codec: Codec) -> usize {
+    match codec {
+        Codec::H264 => 0,
+        Codec::H265 => 1,
+        Codec::Av1 => 2,
+        // Guarded by the open_video dispatch: PyroWave never opens the VAAPI backend.
+        Codec::PyroWave => unreachable!("PyroWave has no VAAPI encoder"),
+    }
 }

 /// `PUNKTFUNK_VAAPI_LOW_POWER` pins the entrypoint mode (`1` = low-power only, `0` = full-feature
 /// only); unset → try full-feature first, fall back to low-power.
 fn low_power_override() -> Option<bool> {
-    parse_low_power(&std::env::var("PUNKTFUNK_VAAPI_LOW_POWER").ok()?)
-}
-
-/// [`low_power_override`]'s value grammar (device-free for the unit tests). Anything outside the
-/// two literal sets means "no pin" — the `[full-feature, low-power]` ladder runs.
-fn parse_low_power(raw: &str) -> Option<bool> {
-    match raw.trim() {
+    match std::env::var("PUNKTFUNK_VAAPI_LOW_POWER").ok()?.trim() {
        "1" | "true" | "yes" | "on" => Some(true),
        "0" | "false" | "no" | "off" => Some(false),
        _ => None,
    }
 }

-/// The entrypoint modes to attempt, in order (`false` = full-feature `EncSlice`, `true` =
-/// low-power VDEnc): an operator pin tries exactly that one; a cached resolution ([`LP_MODE`]:
-/// 1 = full-feature, 2 = low-power) skips the known-failing attempt; anything else runs the full
-/// ladder — full-feature first so AMD's first-try open stays byte-for-byte unchanged. Never
-/// empty: [`open_vaapi_encoder`] relies on at least one attempt running.
-fn entrypoint_ladder(pin: Option<bool>, cached: u8) -> &'static [bool] {
-    match pin {
-        Some(true) => &[true],
-        Some(false) => &[false],
-        None => match cached {
-            1 => &[false],
-            2 => &[true],
-            _ => &[false, true],
-        },
-    }
-}
-
-/// The [`LP_MODE`] value a successful open latches (1 = full-feature, 2 = low-power). Paired with
-/// [`entrypoint_ladder`], which maps it back to the single-mode retry list.
-fn latched_mode(low_power: bool) -> u8 {
-    if low_power {
-        2
-    } else {
-        1
-    }
-}
-
-/// The VUI colour metadata the encoder signals for the session's depth.
-struct Vui {
-    colorspace: ffi::AVColorSpace,
-    range: ffi::AVColorRange,
-    primaries: ffi::AVColorPrimaries,
-    trc: ffi::AVColorTransferCharacteristic,
-}
-
-/// 10-bit HDR: BT.2020 primaries + SMPTE-2084 (PQ) transfer, limited range — matches the P010 the
-/// CSC produces (swscale BT.2020 on the CPU path; `scale_vaapi` pinned to bt2020 on the zero-copy
-/// path); the client decoder auto-detects PQ from the VUI. SDR: we hand the encoder BT.709
-/// *limited* NV12 (swscale CSC on the CPU path; `scale_vaapi` pinned to
-/// `out_color_matrix=bt709:out_range=limited` on the zero-copy path, with the full-range RGB input
-/// tagged), so signal that VUI — else the client decoder washes the picture out.
-fn vui_for(ten_bit: bool) -> Vui {
-    if ten_bit {
-        Vui {
-            colorspace: ffi::AVColorSpace::AVCOL_SPC_BT2020_NCL,
-            range: ffi::AVColorRange::AVCOL_RANGE_MPEG,
-            primaries: ffi::AVColorPrimaries::AVCOL_PRI_BT2020,
-            trc: ffi::AVColorTransferCharacteristic::AVCOL_TRC_SMPTE2084,
-        }
-    } else {
-        Vui {
-            colorspace: ffi::AVColorSpace::AVCOL_SPC_BT709,
-            range: ffi::AVColorRange::AVCOL_RANGE_MPEG,
-            primaries: ffi::AVColorPrimaries::AVCOL_PRI_BT709,
-            trc: ffi::AVColorTransferCharacteristic::AVCOL_TRC_BT709,
-        }
-    }
-}
-
-/// The explicit `profile` option for this codec/depth, or `None` to let the encoder derive it.
-/// HEVC Main10 is pinned explicitly so the depth is never silently dropped (`hevc_vaapi` would
-/// derive it from the P010 surfaces, but a derivation can regress quietly); 10-bit AV1 is
-/// input-driven — no profile knob — and every 8-bit open keeps the encoder default.
-fn explicit_profile(codec: Codec, ten_bit: bool) -> Option<&'static str> {
-    (ten_bit && codec == Codec::H265).then_some("main10")
-}
-
-/// `PUNKTFUNK_VAAPI_ASYNC_DEPTH` grammar: 1..=8 accepted verbatim; unset, junk, and out-of-range
-/// values all resolve to depth 1 — the lowest-latency structure (see the `async_depth` note at the
-/// call site for why 1 is the default and what depth ≥ 2 trades).
-fn async_depth(raw: Option<&str>) -> u32 {
-    raw.and_then(|s| s.parse::<u32>().ok())
-        .filter(|d| (1..=8).contains(d))
-        .unwrap_or(1)
-}
-
-/// The `scale_vaapi` filter args for the session's depth. The VPP's output colour is pinned to
-/// exactly what the encoder's VUI signals ([`vui_for`]) — without the explicit options the
-/// conversion matrix is whatever the driver defaults to for an unspecified output (Mesa: BT.601),
-/// a hue shift against the signaled VUI. (The PQ transfer is per-channel and rides through the
-/// matrix untouched.)
-fn scale_vaapi_args(ten_bit: bool) -> &'static CStr {
-    if ten_bit {
-        c"format=p010:out_color_matrix=bt2020:out_range=limited"
-    } else {
-        c"format=nv12:out_color_matrix=bt709:out_range=limited"
-    }
-}
-
-/// What a (captured format, negotiated bit depth) pair resolves to at open. 10-bit rides on the
-/// captured PIXELS, not the negotiated depth — see [`crate::ten_bit_input`] for the failure the
-/// reverse shape produces.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum DepthResolution {
-    /// PQ-graded 10-bit frames on a non-10-bit session: refuse the open, so PQ content is never
-    /// mislabeled BT.709.
-    RefuseMislabeledPq,
-    /// 10-bit negotiated but the capture stayed SDR: honestly encode 8-bit (with a warning).
-    SdrDowngrade,
-    /// Format and negotiated depth agree.
-    Agreed,
-}
-
-/// See [`DepthResolution`].
-fn resolve_depth(format: PixelFormat, bit_depth: u8) -> DepthResolution {
-    if format.is_hdr_rgb10() && bit_depth != 10 {
-        DepthResolution::RefuseMislabeledPq
-    } else if bit_depth == 10 && !format.is_hdr_rgb10() {
-        DepthResolution::SdrDowngrade
-    } else {
-        DepthResolution::Agreed
-    }
-}
-
-/// Whether a codec is even eligible for the 10-bit probe: PyroWave answers 10-bit support on its
-/// own path (no VAAPI involved), and a codec without a 10-bit profile can never pass.
-fn ten_bit_probe_eligible(codec: Codec) -> bool {
-    codec.supports_10bit() && codec != Codec::PyroWave
-}
-
 /// Open the VAAPI encoder, resolving the entrypoint mode: try the full-feature entrypoint first
 /// and, if the driver rejects it, retry with `low_power=1` — modern Intel (Gen12+/Arc) exposes
 /// ONLY the low-power VDEnc entrypoint (ffmpeg's `vaapi_encode` defaults `low_power=0` and errors
@@ -258,13 +116,16 @@ unsafe fn open_vaapi_encoder(
    frames_ref: *mut ffi::AVBufferRef,
    ten_bit: bool,
 ) -> Result<encoder::video::Encoder> {
-    let key = lp_key(codec, ten_bit);
-    let cached = LP_MODE
-        .get_or_init(|| Mutex::new(HashMap::new()))
-        .lock()
-        .map(|m| m.get(&key).copied().unwrap_or(0))
-        .unwrap_or(0);
-    let modes: &[bool] = entrypoint_ladder(low_power_override(), cached);
+    let idx = lp_idx(codec);
+    let modes: &[bool] = match low_power_override() {
+        Some(true) => &[true],
+        Some(false) => &[false],
+        None => match LP_MODE[idx].load(Ordering::Relaxed) {
+            1 => &[false],
+            2 => &[true],
+            _ => &[false, true],
+        },
+    };
    let mut first_err = None;
    for &lp in modes {
        match open_vaapi_encoder_mode(
@@ -279,9 +140,7 @@ unsafe fn open_vaapi_encoder(
            lp,
        ) {
            Ok(enc) => {
-                if let Ok(mut m) = LP_MODE.get_or_init(|| Mutex::new(HashMap::new())).lock() {
-                    m.insert(key.clone(), latched_mode(lp));
-                }
+                LP_MODE[idx].store(if lp { 2 } else { 1 }, Ordering::Relaxed);
                if lp {
                    tracing::info!(
                        encoder = codec.vaapi_name(),
@@ -337,18 +196,32 @@ unsafe fn open_vaapi_encoder_mode(
    apply_low_latency_rc(&mut video, fps, bitrate_bps);
    let raw = video.as_mut_ptr();
    (*raw).gop_size = i32::MAX; // no periodic IDR (forced-IDR via pict_type=I on RFI)
-    let vui = vui_for(ten_bit);
-    (*raw).colorspace = vui.colorspace;
-    (*raw).color_range = vui.range;
-    (*raw).color_primaries = vui.primaries;
-    (*raw).color_trc = vui.trc;
+    if ten_bit {
+        // HDR10: BT.2020 primaries + SMPTE-2084 (PQ) transfer, limited range — matches the P010
+        // the CSC produces (swscale BT.2020 on the CPU path; scale_vaapi pinned to bt2020 on the
+        // zero-copy path). The client decoder auto-detects PQ from the VUI.
+        (*raw).colorspace = ffi::AVColorSpace::AVCOL_SPC_BT2020_NCL;
+        (*raw).color_range = ffi::AVColorRange::AVCOL_RANGE_MPEG;
+        (*raw).color_primaries = ffi::AVColorPrimaries::AVCOL_PRI_BT2020;
+        (*raw).color_trc = ffi::AVColorTransferCharacteristic::AVCOL_TRC_SMPTE2084;
+    } else {
+        // We hand the encoder BT.709 *limited* NV12 (swscale CSC on the CPU path; scale_vaapi pinned
+        // to `out_color_matrix=bt709:out_range=limited` on the zero-copy path, with the full-range
+        // RGB input tagged), so signal that VUI — else the client decoder washes the picture out.
+        (*raw).colorspace = ffi::AVColorSpace::AVCOL_SPC_BT709;
+        (*raw).color_range = ffi::AVColorRange::AVCOL_RANGE_MPEG;
+        (*raw).color_primaries = ffi::AVColorPrimaries::AVCOL_PRI_BT709;
+        (*raw).color_trc = ffi::AVColorTransferCharacteristic::AVCOL_TRC_BT709;
+    }
    (*raw).pix_fmt = ffi::AVPixelFormat::AV_PIX_FMT_VAAPI;
    (*raw).hw_device_ctx = ffi::av_buffer_ref(device_ref);
    (*raw).hw_frames_ctx = ffi::av_buffer_ref(frames_ref);

    let mut opts = Dictionary::new();
-    if let Some(profile) = explicit_profile(codec, ten_bit) {
-        opts.set("profile", profile);
+    if ten_bit && codec == Codec::H265 {
+        // HEVC Main10. `hevc_vaapi` derives it from the P010 surfaces, but pin it explicitly so
+        // the depth is never silently dropped. (10-bit AV1 is input-driven — no profile knob.)
+        opts.set("profile", "main10");
    }
    // async_depth=1: `send_frame` blocks until THIS frame's ASIC encode completes — the lowest
    // latency structure libavcodec's vaapi_encode offers. Measured on the 780M at 1440p60: depth 1
@@ -358,7 +231,11 @@ unsafe fn open_vaapi_encoder_mode(
    // where depth 2 restores throughput at that one-frame cost. NOTE: the per-frame block tracks
    // GPU CLOCKS — a paced 60 fps trickle lets the VCN downclock (~8 ms/frame vs ~4.4 ms hot);
    // see `gpuclocks` for the session clock pin that removes the ramp tax.
-    let depth = async_depth(std::env::var("PUNKTFUNK_VAAPI_ASYNC_DEPTH").ok().as_deref());
+    let depth = std::env::var("PUNKTFUNK_VAAPI_ASYNC_DEPTH")
+        .ok()
+        .and_then(|s| s.parse::<u32>().ok())
+        .filter(|d| (1..=8).contains(d))
+        .unwrap_or(1);
    opts.set("async_depth", &depth.to_string());
    if low_power {
        opts.set("low_power", "1"); // VDEnc — the only encode entrypoint on modern Intel
@@ -376,20 +253,20 @@ pub fn probe_can_encode(codec: Codec) -> bool {
    if ffmpeg::init().is_err() {
        return false;
    }
-    // A missing VA device (non-VAAPI host, GPU-less CI) is an expected probe outcome — quiet
-    // ffmpeg's "No VA display found" error for the probe. Held until the function returns, so the
-    // level is restored after the open either way. Shares one lock with the NVENC probes, which
-    // race this one on the same libav global (see [`crate::linux::QuietLibavLog`]).
-    let _quiet = crate::linux::QuietLibavLog::new();
-    // SAFETY: `ffmpeg::init()` returned Ok above, so libav is initialized. `VaapiHw::new` (an
-    // `unsafe fn`) builds a VAAPI device + NV12 frames pool from the literal NV12/640x480/pool=2
-    // args and hands back a RAII handle that unrefs both `AVBufferRef`s on drop.
-    // `open_vaapi_encoder` (an `unsafe fn`) borrows `hw.device_ref`/`hw.frames_ref` — the two
-    // non-null refs `VaapiHw::new` just created — and `av_buffer_ref`s them into the encoder; `hw`
-    // is a live local for the whole match arm, so the borrows outlive the synchronous call, and
-    // both `hw` and the probe encoder are dropped (RAII) when the arm ends.
+    // SAFETY: `ffmpeg::init()` returned Ok above, so libav is initialized. `av_log_get_level`/
+    // `av_log_set_level` only read/write libav's global integer log level (no pointer args) and are
+    // always sound to call post-init. `VaapiHw::new` (an `unsafe fn`) builds a VAAPI device + NV12
+    // frames pool from the literal NV12/640x480/pool=2 args and hands back a RAII handle that unrefs
+    // both `AVBufferRef`s on drop. `open_vaapi_encoder` (an `unsafe fn`) borrows `hw.device_ref`/
+    // `hw.frames_ref` — the two non-null refs `VaapiHw::new` just created — and `av_buffer_ref`s them
+    // into the encoder; `hw` is a live local for the whole match arm, so the borrows outlive the
+    // synchronous call, and both `hw` and the probe encoder are dropped (RAII) when the arm ends.
    unsafe {
-        match VaapiHw::new(ffi::AVPixelFormat::AV_PIX_FMT_NV12, 640, 480, 2) {
+        // A missing VA device (non-VAAPI host, GPU-less CI) is an expected probe outcome — quiet
+        // ffmpeg's "No VA display found" error for the probe, then restore the level.
+        let prev = ffi::av_log_get_level();
+        ffi::av_log_set_level(ffi::AV_LOG_FATAL);
+        let ok = match VaapiHw::new(ffi::AVPixelFormat::AV_PIX_FMT_NV12, 640, 480, 2) {
            Ok(hw) => open_vaapi_encoder(
                codec,
                640,
@@ -402,7 +279,9 @@ pub fn probe_can_encode(codec: Codec) -> bool {
            )
            .is_ok(),
            Err(_) => false,
-        }
+        };
+        ffi::av_log_set_level(prev);
+        ok
    }
 }

@@ -412,23 +291,24 @@ pub fn probe_can_encode(codec: Codec) -> bool {
 /// ([`crate::can_encode_10bit`]), so a non-Main10 GPU resolves every session to 8-bit SDR before
 /// the Welcome (honest downgrade).
 pub fn probe_can_encode_10bit(codec: Codec) -> bool {
-    if !ten_bit_probe_eligible(codec) {
+    if !codec.supports_10bit() || codec == Codec::PyroWave {
        return false;
    }
    if ffmpeg::init().is_err() {
        return false;
    }
-    // A missing VA device / no Main10 entrypoint is an expected probe outcome — quiet ffmpeg's
-    // error for the probe. Held until the function returns, so the level is restored after the open
-    // either way, and shared with the other probes (see [`crate::linux::QuietLibavLog`]).
-    let _quiet = crate::linux::QuietLibavLog::new();
-    // SAFETY: `ffmpeg::init()` returned Ok above, so libav is initialized. `VaapiHw::new` (an
+    // SAFETY: `ffmpeg::init()` returned Ok above, so libav is initialized. `av_log_{get,set}_level`
+    // only read/write libav's global integer log level (no pointer args). `VaapiHw::new` (an
    // `unsafe fn`) builds a VAAPI device + P010 frames pool from the literal args and hands back a
    // RAII handle; `open_vaapi_encoder` (an `unsafe fn`) borrows `hw.device_ref`/`hw.frames_ref` —
    // the two non-null refs `VaapiHw::new` just created, live locals for the whole match arm — and
    // `av_buffer_ref`s them into the probe encoder. Both `hw` and the encoder drop (RAII) at arm end.
    unsafe {
-        match VaapiHw::new(ffi::AVPixelFormat::AV_PIX_FMT_P010LE, 640, 480, 2) {
+        // A missing VA device / no Main10 entrypoint is an expected probe outcome — quiet ffmpeg's
+        // error for the probe, then restore the level.
+        let prev = ffi::av_log_get_level();
+        ffi::av_log_set_level(ffi::AV_LOG_FATAL);
+        let ok = match VaapiHw::new(ffi::AVPixelFormat::AV_PIX_FMT_P010LE, 640, 480, 2) {
            Ok(hw) => open_vaapi_encoder(
                codec,
                640,
@@ -441,7 +321,9 @@ pub fn probe_can_encode_10bit(codec: Codec) -> bool {
            )
            .is_ok(),
            Err(_) => false,
-        }
+        };
+        ffi::av_log_set_level(prev);
+        ok
    }
 }

@@ -937,7 +819,24 @@ impl DmabufInner {
            }
            init!(src, ptr::null(), "buffer");
            init!(hwmap, c"mode=read".as_ptr(), "hwmap");
-            init!(scale, scale_vaapi_args(ten_bit).as_ptr(), "scale_vaapi");
+            // Pin the VPP's output colour to what the encoder's VUI signals (BT.709 limited SDR,
+            // or BT.2020 limited P010 for HDR — the PQ transfer is per-channel and rides through
+            // the matrix untouched). Without the explicit options the conversion matrix is
+            // whatever the driver defaults to for an unspecified output (Mesa: BT.601) — a hue
+            // shift against the signaled VUI.
+            if ten_bit {
+                init!(
+                    scale,
+                    c"format=p010:out_color_matrix=bt2020:out_range=limited".as_ptr(),
+                    "scale_vaapi"
+                );
+            } else {
+                init!(
+                    scale,
+                    c"format=nv12:out_color_matrix=bt709:out_range=limited".as_ptr(),
+                    "scale_vaapi"
+                );
+            }
            init!(sink, ptr::null(), "buffersink");

            let link = |a: *mut ffi::AVFilterContext, b: *mut ffi::AVFilterContext| -> c_int {
@@ -1035,8 +934,7 @@ impl DmabufInner {
        //    `Box` puts it on the heap with a unique owner.
        //  * `dmabuf.fd.as_raw_fd()` is the fd of the caller's `&DmabufFrame`, which owns it for the
        //    whole synchronous `submit`; we describe one object/layer/plane from its
-        //    fourcc/modifier/offset/stride and its `lseek`-queried size. `libc::lseek` on that live
-        //    fd only reads the description's size and returns it (or -1); it touches no Rust memory.
+        //    fourcc/modifier/offset/stride and pass `object.size = 0` (ffmpeg queries the real size).
        //  * `av_frame_alloc` → `drm` (null-checked); we set its scalar fields and
        //    `hw_frames_ctx = av_buffer_ref(self.drm_frames)` (new ref of the live owned ctx).
        //  * `data[0] = Box::into_raw(desc)` transfers the box into the frame; `buf[0] =
@@ -1052,17 +950,7 @@ impl DmabufInner {
            let mut desc: Box<ffi::AVDRMFrameDescriptor> = Box::new(std::mem::zeroed());
            desc.nb_objects = 1;
            desc.objects[0].fd = dmabuf.fd.as_raw_fd();
-            // The object's REAL size, not 0. libav does not query it for us — both of its import
-            // paths hand this value straight to libva, as `prime_desc.objects[i].size` on the
-            // PRIME_2 path and `buffer_desc.data_size` on the legacy fallback — so a 0 told every
-            // VA driver the backing object was empty and left it to work the real size out itself.
-            // The drivers this has run on (radeonsi, modern Intel iHD) do; a Gen9 Intel host
-            // answered `vaCreateSurfaces` with VA_STATUS_ERROR_ALLOCATION_FAILED on every single
-            // frame. `lseek(SEEK_END)` is the standard dma-buf size query — the same one the
-            // Vulkan bridge already uses on these fds (`pf_zerocopy::imp::vulkan`). If a kernel
-            // refuses it, keep the old 0 rather than drop a frame we could still have encoded.
-            let obj_size = libc::lseek(dmabuf.fd.as_raw_fd(), 0, libc::SEEK_END);
-            desc.objects[0].size = if obj_size > 0 { obj_size as _ } else { 0 };
+            desc.objects[0].size = 0;
            desc.objects[0].format_modifier = dmabuf.modifier;
            desc.nb_layers = 1;
            desc.layers[0].format = self.fourcc;
@@ -1111,18 +999,8 @@ impl DmabufInner {
                ffi::AV_BUFFERSRC_FLAG_KEEP_REF as c_int,
            );
            ffi::av_frame_free(&mut drm);
-            // These two stages ARE the import: the push hands libav our DRM-PRIME descriptor, and
-            // the pull is where `hwmap` actually maps it into a VA surface (and `scale_vaapi` runs
-            // the CSC). A failure here means this driver would not take this compositor's dmabuf —
-            // which no encoder rebuild can fix — so tell the process-wide latch, and capture
-            // negotiates CPU frames from the next session on. `avcodec_send_frame` below is
-            // deliberately NOT counted: that one is the encoder stalling, which the in-place
-            // rebuild above us exists to recover, and disabling zero-copy over it would be a
-            // permanent penalty for a transient fault.
            if r < 0 {
-                let e = format!("av_buffersrc_add_frame failed ({r})");
-                pf_zerocopy::note_raw_dmabuf_import_failure(&e);
-                bail!("{e}");
+                bail!("av_buffersrc_add_frame failed ({r})");
            }
            t_push = t0.elapsed();
            let mut nv12 = ffi::av_frame_alloc();
@@ -1132,11 +1010,8 @@ impl DmabufInner {
            let r = ffi::av_buffersink_get_frame(self.sink, nv12);
            if r < 0 {
                ffi::av_frame_free(&mut nv12);
-                let e = format!("av_buffersink_get_frame failed ({r})");
-                pf_zerocopy::note_raw_dmabuf_import_failure(&e);
-                bail!("{e}");
+                bail!("av_buffersink_get_frame failed ({r})");
            }
-            pf_zerocopy::note_raw_dmabuf_import_ok();
            t_pull = t0.elapsed() - t_push;
            (*nv12).pts = pts;
            (*nv12).pict_type = if idr {
@@ -1229,18 +1104,21 @@ impl VaapiEncoder {
        chroma: super::ChromaFormat,
    ) -> Result<Self> {
        // 10-bit rides on the captured format: an HDR capture (X2RGB10/X2BGR10) opens the P010 /
-        // Main10 / PQ-VUI variant of whichever inner path the first frame selects.
-        match resolve_depth(format, bit_depth) {
-            DepthResolution::RefuseMislabeledPq => bail!(
+        // Main10 / PQ-VUI variant of whichever inner path the first frame selects. A 10-bit
+        // request whose capture stayed SDR honestly encodes 8-bit; the reverse (PQ frames on an
+        // 8-bit session) is refused so PQ content is never mislabeled BT.709.
+        if format.is_hdr_rgb10() && bit_depth != 10 {
+            bail!(
                "captured 10-bit HDR frames ({format:?}) on an {bit_depth}-bit VAAPI session — \
                 refusing to mislabel PQ content"
-            ),
-            DepthResolution::SdrDowngrade => tracing::warn!(
+            );
+        }
+        if bit_depth == 10 && !format.is_hdr_rgb10() {
+            tracing::warn!(
                bit_depth,
                ?format,
                "10-bit requested but the capture stayed SDR — encoding 8-bit"
-            ),
-            DepthResolution::Agreed => {}
+            );
        }
        // VAAPI 4:4:4 is deferred (see `probe_can_encode_444`): no validated AMD/Intel hardware in the
        // lab exposes a HEVC 4:4:4 encode entrypoint, and the probe returns false so the host never
@@ -1390,261 +1268,3 @@ impl Encoder for VaapiEncoder {
        Ok(())
    }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// The operator pin tries exactly one mode; a cached resolution ([`LP_MODE`]) tries only the
-    /// mode that worked; anything else runs the full ladder, full-feature FIRST — AMD's first-try
-    /// open must stay byte-for-byte unchanged.
-    #[test]
-    fn entrypoint_ladder_orders_and_pins() {
-        assert_eq!(entrypoint_ladder(None, 0), &[false, true]);
-        assert_eq!(entrypoint_ladder(None, 1), &[false]);
-        assert_eq!(entrypoint_ladder(None, 2), &[true]);
-        // A corrupt/unknown cache value degrades to the full ladder, never to a wrong pin.
-        assert_eq!(entrypoint_ladder(None, 77), &[false, true]);
-        // The pin beats the cache in BOTH directions — what makes PUNKTFUNK_VAAPI_LOW_POWER a
-        // real escape hatch from a stale latch.
-        for cached in [0u8, 1, 2, 77] {
-            assert_eq!(entrypoint_ladder(Some(true), cached), &[true]);
-            assert_eq!(entrypoint_ladder(Some(false), cached), &[false]);
-        }
-    }
-
-    /// The latch round-trip: what a successful open stores makes the NEXT open attempt exactly
-    /// the mode that worked (the "skip the known-failing attempt and its libav error spew"
-    /// contract — and, per [`LP_MODE`], the shape that must never cross devices or depths).
-    #[test]
-    fn latch_round_trip_pins_the_resolved_mode() {
-        for lp in [false, true] {
-            assert_eq!(entrypoint_ladder(None, latched_mode(lp)), &[lp]);
-        }
-    }
-
-    /// `PUNKTFUNK_VAAPI_LOW_POWER` grammar: the two lowercase literal sets pin; anything else —
-    /// including uppercase — means "no pin" (the ladder runs). Case-sensitivity is pinned as
-    /// shipped behavior.
-    #[test]
-    fn low_power_grammar() {
-        for s in ["1", "true", "yes", "on", " on ", "yes\n"] {
-            assert_eq!(parse_low_power(s), Some(true), "{s:?}");
-        }
-        for s in ["0", "false", "no", "off", " off "] {
-            assert_eq!(parse_low_power(s), Some(false), "{s:?}");
-        }
-        for s in ["", "2", "TRUE", "On", "enabled", "low_power"] {
-            assert_eq!(parse_low_power(s), None, "{s:?}");
-        }
-    }
-
-    /// Every part of the LP_MODE key is load-bearing (see the [`LP_MODE`] field comments): the
-    /// node (a GPU-preference switch must re-resolve — the old codec-only key was a
-    /// session-killer), the codec, and the depth (an 8-bit answer must never pin the 10-bit open —
-    /// the HDR under-advertisement).
-    #[test]
-    fn lp_key_separates_node_codec_and_depth() {
-        let base = lp_key_for("/dev/dri/renderD128", Codec::H265, false);
-        assert_ne!(base, lp_key_for("/dev/dri/renderD129", Codec::H265, false));
-        assert_ne!(base, lp_key_for("/dev/dri/renderD128", Codec::H264, false));
-        assert_ne!(base, lp_key_for("/dev/dri/renderD128", Codec::H265, true));
-    }
-
-    /// `PUNKTFUNK_VAAPI_ASYNC_DEPTH` grammar: 1..=8 verbatim; unset, junk, zero, and past-the-cap
-    /// all resolve to the lowest-latency depth 1.
-    #[test]
-    fn async_depth_grammar() {
-        assert_eq!(async_depth(None), 1);
-        assert_eq!(async_depth(Some("1")), 1);
-        assert_eq!(async_depth(Some("2")), 2);
-        assert_eq!(async_depth(Some("8")), 8);
-        assert_eq!(async_depth(Some("0")), 1);
-        assert_eq!(async_depth(Some("9")), 1);
-        assert_eq!(async_depth(Some("-1")), 1);
-        assert_eq!(async_depth(Some("fast")), 1);
-    }
-
-    /// The swscale source map: packed RGB/BGR and the GNOME 50+ HDR 2:10:10:10 layouts convert;
-    /// planar/video formats are refused (the CPU path is a packed-RGB fallback, not a general
-    /// converter).
-    #[test]
-    fn sws_src_accepts_packed_rgb_only() {
-        assert_eq!(vaapi_sws_src(PixelFormat::Bgrx).unwrap(), Pixel::BGRZ);
-        assert_eq!(vaapi_sws_src(PixelFormat::Rgbx).unwrap(), Pixel::RGBZ);
-        assert_eq!(vaapi_sws_src(PixelFormat::Bgra).unwrap(), Pixel::BGRA);
-        assert_eq!(vaapi_sws_src(PixelFormat::Rgba).unwrap(), Pixel::RGBA);
-        assert_eq!(vaapi_sws_src(PixelFormat::Rgb).unwrap(), Pixel::RGB24);
-        assert_eq!(vaapi_sws_src(PixelFormat::Bgr).unwrap(), Pixel::BGR24);
-        assert_eq!(
-            vaapi_sws_src(PixelFormat::X2Rgb10).unwrap(),
-            Pixel::X2RGB10LE
-        );
-        assert_eq!(
-            vaapi_sws_src(PixelFormat::X2Bgr10).unwrap(),
-            Pixel::X2BGR10LE
-        );
-        for f in [
-            PixelFormat::Nv12,
-            PixelFormat::P010,
-            PixelFormat::Rgb10a2,
-            PixelFormat::Yuv444,
-        ] {
-            assert!(vaapi_sws_src(f).is_err(), "{f:?} must be refused");
-        }
-    }
-
-    /// VUI ↔ CSC agreement: the signaled VUI and the zero-copy VPP's pinned output colour must
-    /// name the SAME matrix/range per depth — a mismatch is exactly the Mesa-BT.601 hue shift the
-    /// pin exists to prevent.
-    #[test]
-    fn vui_and_scale_args_agree_per_depth() {
-        let sdr = vui_for(false);
-        assert!(matches!(sdr.colorspace, ffi::AVColorSpace::AVCOL_SPC_BT709));
-        assert!(matches!(sdr.range, ffi::AVColorRange::AVCOL_RANGE_MPEG));
-        assert!(matches!(
-            sdr.primaries,
-            ffi::AVColorPrimaries::AVCOL_PRI_BT709
-        ));
-        assert!(matches!(
-            sdr.trc,
-            ffi::AVColorTransferCharacteristic::AVCOL_TRC_BT709
-        ));
-        let args = scale_vaapi_args(false).to_str().unwrap();
-        for needle in ["format=nv12", "out_color_matrix=bt709", "out_range=limited"] {
-            assert!(
-                args.contains(needle),
-                "SDR scale args miss {needle}: {args}"
-            );
-        }
-
-        let hdr = vui_for(true);
-        assert!(matches!(
-            hdr.colorspace,
-            ffi::AVColorSpace::AVCOL_SPC_BT2020_NCL
-        ));
-        assert!(matches!(hdr.range, ffi::AVColorRange::AVCOL_RANGE_MPEG));
-        assert!(matches!(
-            hdr.primaries,
-            ffi::AVColorPrimaries::AVCOL_PRI_BT2020
-        ));
-        assert!(matches!(
-            hdr.trc,
-            ffi::AVColorTransferCharacteristic::AVCOL_TRC_SMPTE2084
-        ));
-        let args = scale_vaapi_args(true).to_str().unwrap();
-        for needle in [
-            "format=p010",
-            "out_color_matrix=bt2020",
-            "out_range=limited",
-        ] {
-            assert!(
-                args.contains(needle),
-                "HDR scale args miss {needle}: {args}"
-            );
-        }
-    }
-
-    /// The honest-downgrade table at open: PQ pixels demand a 10-bit session (refused otherwise —
-    /// PQ content must never be mislabeled BT.709); a 10-bit session over SDR pixels downgrades
-    /// honestly to 8-bit; agreement passes both ways.
-    #[test]
-    fn depth_resolution_table() {
-        use DepthResolution::*;
-        assert_eq!(resolve_depth(PixelFormat::X2Rgb10, 8), RefuseMislabeledPq);
-        assert_eq!(resolve_depth(PixelFormat::X2Bgr10, 8), RefuseMislabeledPq);
-        assert_eq!(resolve_depth(PixelFormat::Bgrx, 10), SdrDowngrade);
-        assert_eq!(resolve_depth(PixelFormat::Bgrx, 8), Agreed);
-        assert_eq!(resolve_depth(PixelFormat::X2Rgb10, 10), Agreed);
-        assert_eq!(resolve_depth(PixelFormat::X2Bgr10, 10), Agreed);
-    }
-
-    /// Main10 is pinned explicitly for 10-bit HEVC ONLY: 10-bit AV1 is input-driven (no profile
-    /// knob), and every 8-bit open keeps the encoder's default profile.
-    #[test]
-    fn explicit_profile_is_hevc_main10_only() {
-        assert_eq!(explicit_profile(Codec::H265, true), Some("main10"));
-        assert_eq!(explicit_profile(Codec::H265, false), None);
-        assert_eq!(explicit_profile(Codec::Av1, true), None);
-        assert_eq!(explicit_profile(Codec::Av1, false), None);
-        assert_eq!(explicit_profile(Codec::H264, true), None);
-        assert_eq!(explicit_profile(Codec::H264, false), None);
-    }
-
-    /// The 10-bit probe gate: HEVC and AV1 are probe-eligible; H.264 (no 10-bit path here) and
-    /// PyroWave (answers 10-bit on its own path, no VAAPI involved) are refused before any device
-    /// is touched — this is what keeps the probe safe on GPU-less CI.
-    #[test]
-    fn ten_bit_probe_gate() {
-        assert!(ten_bit_probe_eligible(Codec::H265));
-        assert!(ten_bit_probe_eligible(Codec::Av1));
-        assert!(!ten_bit_probe_eligible(Codec::H264));
-        assert!(!ten_bit_probe_eligible(Codec::PyroWave));
-    }
-
-    /// Probe smoke on real silicon: H.264 VAAPI encode opens on every supported AMD/Intel GPU;
-    /// the narrower codecs are printed, not asserted (device-dependent). Build anywhere, run on a
-    /// VAAPI host:
-    ///   cargo test -p pf-encode --no-run
-    ///   <host> target/debug/deps/pf_encode-<hash> --ignored --nocapture vaapi_probe_smoke
-    #[test]
-    #[ignore = "needs a real VAAPI device (run on an AMD/Intel host, not the build box)"]
-    fn vaapi_probe_smoke() {
-        assert!(
-            probe_can_encode(Codec::H264),
-            "H.264 VAAPI encode should open on any supported AMD/Intel GPU"
-        );
-        for codec in [Codec::H265, Codec::Av1] {
-            eprintln!("probe_can_encode({codec:?}) = {}", probe_can_encode(codec));
-            eprintln!(
-                "probe_can_encode_10bit({codec:?}) = {}",
-                probe_can_encode_10bit(codec)
-            );
-        }
-    }
-
-    /// CPU-path encode round-trip on real silicon: open → BGRX frames → poll AUs → the first AU
-    /// is the IDR. Exercises the swscale CSC, the VA surface upload, and the entrypoint ladder
-    /// end-to-end (same recipe as [`vaapi_probe_smoke`]).
-    #[test]
-    #[ignore = "needs a real VAAPI device (run on an AMD/Intel host, not the build box)"]
-    fn vaapi_cpu_encode_smoke() {
-        let (w, h) = (256u32, 256u32);
-        let mut enc = VaapiEncoder::open(
-            Codec::H264,
-            PixelFormat::Bgrx,
-            w,
-            h,
-            30,
-            2_000_000,
-            8,
-            crate::ChromaFormat::Yuv420,
-        )
-        .expect("open");
-        let mut aus = Vec::new();
-        for i in 0..30u32 {
-            let mut buf = vec![0u8; (w * h * 4) as usize];
-            for px in buf.chunks_exact_mut(4) {
-                px.copy_from_slice(&[(i * 8) as u8, 0x40, 0xC0, 0xFF]);
-            }
-            let frame = CapturedFrame {
-                width: w,
-                height: h,
-                pts_ns: u64::from(i) * 33_333_333,
-                format: PixelFormat::Bgrx,
-                payload: FramePayload::Cpu(buf),
-                cursor: None,
-            };
-            enc.submit(&frame).expect("submit");
-            while let Some(au) = enc.poll().expect("poll") {
-                aus.push(au);
-            }
-        }
-        enc.flush().expect("flush");
-        while let Some(au) = enc.poll().expect("poll") {
-            aus.push(au);
-        }
-        assert!(!aus.is_empty(), "no AUs out of 30 submitted frames");
-        assert!(aus[0].keyframe, "the first AU must be the IDR");
-    }
-}
@@ -47,15 +47,6 @@ pub const PRIMARY_REF_NONE: u8 = 7;
 /// `VK_VIDEO_ENCODE_AV1_SUPERBLOCK_SIZE_128_BIT_KHR` (bit 1 of the superblock-size flags).
 pub const SUPERBLOCK_SIZE_128: u32 = 0x2;

-// `VkVideoEncodeAV1CapabilityFlagBitsKHR` — the two that decide whether the encode source may be a
-// different size from the declared frame. Both absent on RADV PHOENIX.
-/// Without this, the source's `codedExtent` MUST equal the sequence header's
-/// `max_frame_{width,height}_minus_1 + 1` (`VUID-vkCmdEncodeVideoKHR-flags-10324`).
-pub const CAPABILITY_FRAME_SIZE_OVERRIDE: u32 = 0x0000_0008;
-/// Without this, EVERY reference slot's `codedExtent` MUST equal the source's
-/// (`VUID-vkCmdEncodeVideoKHR-flags-10325`).
-pub const CAPABILITY_MOTION_VECTOR_SCALING: u32 = 0x0000_0010;
-
 // `VkVideoEncodeAV1PredictionModeKHR`
 pub const PREDICTION_MODE_INTRA_ONLY: i32 = 0;
 pub const PREDICTION_MODE_SINGLE_REFERENCE: i32 = 1;
@@ -507,366 +498,3 @@ pub struct StdVideoEncodeAV1OperatingPointInfo {
 pub fn stype(raw: i32) -> vk::StructureType {
    vk::StructureType::from_raw(raw)
 }
-
-// ---------- ABI layout guard ----------
-//
-// These structs are hand-copied and handed to the driver through raw `p_next` chains, so nothing in
-// the type system relates them to the C definitions any more: an edit that inserts, drops, widens or
-// re-pads a field is not a compile error, it is the driver reading our bytes at the wrong offsets.
-// The assertions below are the missing compile error. They are `const` rather than `#[cfg(test)]`
-// (the shape `amf.rs` uses) so they hold in every build, including the shipped one, and on any
-// target this module compiles for.
-//
-// What they catch: a changed field width, an inserted or removed field, a changed array length, a
-// padding assumption that only holds on one target. What they CANNOT catch: swapping two fields of
-// the same type — offsets are unchanged. That case is only caught by reading the registry, so the
-// field order here was diffed against `vulkan_core.h` and `vk_video/vulkan_video_codec_av1std_encode.h`
-// (Vulkan-Headers `main`, 2026-07-25) when these assertions were written, along with every `ST_*`,
-// flag-bit and enum value above; the bitfield member order is pinned by the test module below.
-//
-// Deliberately duplicated in `vk_valve_rgb.rs` rather than shared: both modules exist to be deleted
-// wholesale once `ash` ships these bindings, and a shared helper would make deleting one break the
-// other.
-macro_rules! assert_abi_layout {
-    ($t:ty { size: $size:expr, align: $align:expr $(, $field:ident @ $off:expr)* $(,)? }) => {
-        const _: () = {
-            assert!(
-                ::core::mem::size_of::<$t>() == $size,
-                concat!(stringify!($t), ": size does not match the C ABI")
-            );
-            assert!(
-                ::core::mem::align_of::<$t>() == $align,
-                concat!(stringify!($t), ": alignment does not match the C ABI")
-            );
-            $(assert!(
-                ::core::mem::offset_of!($t, $field) == $off,
-                concat!(stringify!($t), ".", stringify!($field), ": offset does not match the C ABI")
-            );)*
-        };
-    };
-}
-
-// Std encode structs. The three `*Flags` types are a single C `uint32_t` of bitfields, so only their
-// size and alignment are layout-checkable here; their member order is covered by `abi_tests`.
-assert_abi_layout!(StdVideoEncodeAV1PictureInfoFlags { size: 4, align: 4 });
-
-assert_abi_layout!(StdVideoEncodeAV1PictureInfo {
-    size: 152, align: 8,
-    flags @ 0,
-    frame_type @ 4,
-    frame_presentation_time @ 8,
-    current_frame_id @ 12,
-    order_hint @ 16,
-    primary_ref_frame @ 17,
-    refresh_frame_flags @ 18,
-    coded_denom @ 19,
-    render_width_minus_1 @ 20,
-    render_height_minus_1 @ 22,
-    interpolation_filter @ 24,
-    TxMode @ 28,
-    delta_q_res @ 32,
-    delta_lf_res @ 33,
-    ref_order_hint @ 34,
-    ref_frame_idx @ 42,
-    reserved1 @ 49,
-    delta_frame_id_minus_1 @ 52,
-    pTileInfo @ 80,
-    pQuantization @ 88,
-    pSegmentation @ 96,
-    pLoopFilter @ 104,
-    pCDEF @ 112,
-    pLoopRestoration @ 120,
-    pGlobalMotion @ 128,
-    pExtensionHeader @ 136,
-    pBufferRemovalTimes @ 144,
-});
-
-assert_abi_layout!(StdVideoEncodeAV1ReferenceInfoFlags { size: 4, align: 4 });
-
-assert_abi_layout!(StdVideoEncodeAV1ReferenceInfo {
-    size: 24, align: 8,
-    flags @ 0,
-    RefFrameId @ 4,
-    frame_type @ 8,
-    OrderHint @ 12,
-    reserved1 @ 13,
-    pExtensionHeader @ 16,
-});
-
-assert_abi_layout!(StdVideoEncodeAV1ExtensionHeader {
-    size: 2, align: 1,
-    temporal_id @ 0,
-    spatial_id @ 1,
-});
-
-assert_abi_layout!(StdVideoEncodeAV1OperatingPointInfoFlags { size: 4, align: 4 });
-
-assert_abi_layout!(StdVideoEncodeAV1OperatingPointInfo {
-    size: 20, align: 4,
-    flags @ 0,
-    operating_point_idc @ 4,
-    seq_level_idx @ 6,
-    seq_tier @ 7,
-    decoder_buffer_delay @ 8,
-    encoder_buffer_delay @ 12,
-    initial_display_delay_minus_1 @ 16,
-});
-
-// KHR extension structs.
-assert_abi_layout!(VideoEncodeAV1ProfileInfoKHR {
-    size: 24, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    std_profile @ 16,
-});
-
-assert_abi_layout!(PhysicalDeviceVideoEncodeAV1FeaturesKHR {
-    size: 24, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    video_encode_av1 @ 16,
-});
-
-assert_abi_layout!(VideoEncodeAV1CapabilitiesKHR {
-    size: 128, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    flags @ 16,
-    max_level @ 20,
-    coded_picture_alignment @ 24,
-    max_tiles @ 32,
-    min_tile_size @ 40,
-    max_tile_size @ 48,
-    superblock_sizes @ 56,
-    max_single_reference_count @ 60,
-    single_reference_name_mask @ 64,
-    max_unidirectional_compound_reference_count @ 68,
-    max_unidirectional_compound_group1_reference_count @ 72,
-    unidirectional_compound_reference_name_mask @ 76,
-    max_bidirectional_compound_reference_count @ 80,
-    max_bidirectional_compound_group1_reference_count @ 84,
-    max_bidirectional_compound_group2_reference_count @ 88,
-    bidirectional_compound_reference_name_mask @ 92,
-    max_temporal_layer_count @ 96,
-    max_spatial_layer_count @ 100,
-    max_operating_points @ 104,
-    min_q_index @ 108,
-    max_q_index @ 112,
-    prefers_gop_remaining_frames @ 116,
-    requires_gop_remaining_frames @ 120,
-    std_syntax_flags @ 124,
-});
-
-assert_abi_layout!(VideoEncodeAV1SessionParametersCreateInfoKHR {
-    size: 48, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    p_std_sequence_header @ 16,
-    p_std_decoder_model_info @ 24,
-    std_operating_point_count @ 32,
-    p_std_operating_points @ 40,
-});
-
-assert_abi_layout!(VideoEncodeAV1PictureInfoKHR {
-    size: 80, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    prediction_mode @ 16,
-    rate_control_group @ 20,
-    constant_q_index @ 24,
-    p_std_picture_info @ 32,
-    reference_name_slot_indices @ 40,
-    primary_reference_cdf_only @ 68,
-    generate_obu_extension_header @ 72,
-});
-
-assert_abi_layout!(VideoEncodeAV1DpbSlotInfoKHR {
-    size: 24, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    p_std_reference_info @ 16,
-});
-
-assert_abi_layout!(VideoEncodeAV1RateControlInfoKHR {
-    size: 40, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    flags @ 16,
-    gop_frame_count @ 20,
-    key_frame_period @ 24,
-    consecutive_bipredictive_frame_count @ 28,
-    temporal_layer_count @ 32,
-});
-
-assert_abi_layout!(VideoEncodeAV1QIndexKHR {
-    size: 12, align: 4,
-    intra_q_index @ 0,
-    predictive_q_index @ 4,
-    bipredictive_q_index @ 8,
-});
-
-assert_abi_layout!(VideoEncodeAV1FrameSizeKHR {
-    size: 12, align: 4,
-    intra_frame_size @ 0,
-    predictive_frame_size @ 4,
-    bipredictive_frame_size @ 8,
-});
-
-assert_abi_layout!(VideoEncodeAV1RateControlLayerInfoKHR {
-    size: 64, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    use_min_q_index @ 16,
-    min_q_index @ 20,
-    use_max_q_index @ 32,
-    max_q_index @ 36,
-    use_max_frame_size @ 48,
-    max_frame_size @ 52,
-});
-
-assert_abi_layout!(VideoEncodeAV1GopRemainingFrameInfoKHR {
-    size: 32, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    use_gop_remaining_frames @ 16,
-    gop_remaining_intra @ 20,
-    gop_remaining_predictive @ 24,
-    gop_remaining_bipredictive @ 28,
-});
-
-assert_abi_layout!(VideoEncodeAV1SessionCreateInfoKHR {
-    size: 24, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    use_max_level @ 16,
-    max_level @ 20,
-});
-
-#[cfg(test)]
-mod abi_tests {
-    use super::*;
-
-    /// Assert that `set` lights exactly one bit of the flags word, at `bit`.
-    fn sets_only_bit(
-        storage: __BindgenBitfieldUnit<[u8; 4]>,
-        name: &str,
-        bit: usize,
-        expected_width: usize,
-    ) {
-        for probe in 0..32 {
-            let want = probe >= bit && probe < bit + expected_width;
-            assert_eq!(
-                storage.get_bit(probe),
-                want,
-                "`{name}` should occupy bit(s) {bit}..{}, but bit {probe} disagrees",
-                bit + expected_width
-            );
-        }
-    }
-
-    /// A C bitfield allocates its members from bit 0 upward in declaration order, so the setter for
-    /// the Nth member of `StdVideoEncodeAV1PictureInfoFlags` must write bit N. The array below is
-    /// the member list of `vulkan_video_codec_av1std_encode.h` **in declaration order** — so this
-    /// pins the hand-copied bit indices to the header rather than merely to themselves. A silent
-    /// renumbering here would make the driver read, say, `use_superres` where we meant
-    /// `render_and_frame_size_different`.
-    #[test]
-    fn picture_info_flag_setters_follow_the_c_declaration_order() {
-        #[allow(clippy::type_complexity)]
-        let members: [(&str, fn(&mut StdVideoEncodeAV1PictureInfoFlags)); 29] = [
-            ("error_resilient_mode", |f| f.set_error_resilient_mode(1)),
-            ("disable_cdf_update", |f| f.set_disable_cdf_update(1)),
-            ("use_superres", |f| f.set_use_superres(1)),
-            ("render_and_frame_size_different", |f| {
-                f.set_render_and_frame_size_different(1)
-            }),
-            ("allow_screen_content_tools", |f| {
-                f.set_allow_screen_content_tools(1)
-            }),
-            ("is_filter_switchable", |f| f.set_is_filter_switchable(1)),
-            ("force_integer_mv", |f| f.set_force_integer_mv(1)),
-            ("frame_size_override_flag", |f| {
-                f.set_frame_size_override_flag(1)
-            }),
-            ("buffer_removal_time_present_flag", |f| {
-                f.set_buffer_removal_time_present_flag(1)
-            }),
-            ("allow_intrabc", |f| f.set_allow_intrabc(1)),
-            ("frame_refs_short_signaling", |f| {
-                f.set_frame_refs_short_signaling(1)
-            }),
-            ("allow_high_precision_mv", |f| {
-                f.set_allow_high_precision_mv(1)
-            }),
-            ("is_motion_mode_switchable", |f| {
-                f.set_is_motion_mode_switchable(1)
-            }),
-            ("use_ref_frame_mvs", |f| f.set_use_ref_frame_mvs(1)),
-            ("disable_frame_end_update_cdf", |f| {
-                f.set_disable_frame_end_update_cdf(1)
-            }),
-            ("allow_warped_motion", |f| f.set_allow_warped_motion(1)),
-            ("reduced_tx_set", |f| f.set_reduced_tx_set(1)),
-            ("skip_mode_present", |f| f.set_skip_mode_present(1)),
-            ("delta_q_present", |f| f.set_delta_q_present(1)),
-            ("delta_lf_present", |f| f.set_delta_lf_present(1)),
-            ("delta_lf_multi", |f| f.set_delta_lf_multi(1)),
-            ("segmentation_enabled", |f| f.set_segmentation_enabled(1)),
-            ("segmentation_update_map", |f| {
-                f.set_segmentation_update_map(1)
-            }),
-            ("segmentation_temporal_update", |f| {
-                f.set_segmentation_temporal_update(1)
-            }),
-            ("segmentation_update_data", |f| {
-                f.set_segmentation_update_data(1)
-            }),
-            ("UsesLr", |f| f.set_UsesLr(1)),
-            ("usesChromaLr", |f| f.set_usesChromaLr(1)),
-            ("show_frame", |f| f.set_show_frame(1)),
-            ("showable_frame", |f| f.set_showable_frame(1)),
-        ];
-
-        for (bit, (name, set)) in members.into_iter().enumerate() {
-            let mut flags = StdVideoEncodeAV1PictureInfoFlags {
-                _bitfield_align_1: [],
-                _bitfield_1: __BindgenBitfieldUnit::new([0u8; 4]),
-            };
-            set(&mut flags);
-            sets_only_bit(flags._bitfield_1, name, bit, 1);
-        }
-    }
-
-    /// `reserved : 3` closes out the word — bits 29..32. Checking it is what proves the 29 members
-    /// above are the *whole* list: a dropped member would shift `reserved` down and fail here.
-    #[test]
-    fn picture_info_reserved_occupies_the_top_three_bits() {
-        let mut flags = StdVideoEncodeAV1PictureInfoFlags {
-            _bitfield_align_1: [],
-            _bitfield_1: __BindgenBitfieldUnit::new([0u8; 4]),
-        };
-        flags.set_reserved(0b111);
-        sets_only_bit(flags._bitfield_1, "reserved", 29, 3);
-    }
-
-    /// The same invariant for the two-member reference-info flags word.
-    #[test]
-    fn reference_info_flag_setters_follow_the_c_declaration_order() {
-        #[allow(clippy::type_complexity)]
-        let members: [(&str, fn(&mut StdVideoEncodeAV1ReferenceInfoFlags)); 2] = [
-            ("disable_frame_end_update_cdf", |f| {
-                f.set_disable_frame_end_update_cdf(1)
-            }),
-            ("segmentation_enabled", |f| f.set_segmentation_enabled(1)),
-        ];
-
-        for (bit, (name, set)) in members.into_iter().enumerate() {
-            let mut flags = StdVideoEncodeAV1ReferenceInfoFlags {
-                _bitfield_align_1: [],
-                _bitfield_1: __BindgenBitfieldUnit::new([0u8; 4]),
-            };
-            set(&mut flags);
-            sets_only_bit(flags._bitfield_1, name, bit, 1);
-        }
-    }
-}
@@ -1,836 +0,0 @@
-//! Session/frame **construction** for the Vulkan Video encoder — the unsafe builders
-//! (`make_frame*`, `make_video_image`, `probe_rgb_direct`) and the parameter-set bitstream
-//! writers (`build_parameters_h265`/`_av1`, the AV1 sequence-header OBU). Split from
-//! `vulkan_video.rs` (WP7.5) the way `amf_sys.rs` was split from `amf.rs`: a `#[path]` child
-//! module, so this file sees the parent's private items (`Frame` and friends) with zero
-//! visibility churn, and ~800 lines of construction `unsafe` get their own review surface.
-//! Steady-state encode logic stays in the parent.
-
-// The parent's whole item namespace (Frame, the consts, sibling helpers) — the point of the
-// child-module shape. External imports are this file's own; `vk_util` is a crate-root sibling,
-// so the path is `crate::`, not the parent-relative `super::` the parent uses.
-use super::*;
-use crate::vk_util::{find_mem, make_plain_image, make_view};
-use anyhow::{bail, Result};
-use ash::vk;
-use std::ffi::c_void;
-
-pub(super) fn align_up(v: u64, a: u64) -> u64 {
-    v.div_ceil(a) * a
-}
-
-/// Probe for the RGB-direct encode source (design/vulkan-rgb-direct-encode.md): can this device
-/// take the captured RGB dmabuf directly, with the VCN EFC front-end doing the 709-narrow CSC,
-/// via `VK_VALVE_video_encode_rgb_conversion` (RADV since Mesa 26.0, gated on EFC hardware)?
-/// `Ok((x_offset, y_offset))` carries the chroma-siting bits a session must be created with
-/// (the preferred available bit per axis); `Err` is the first missing requirement, logged as
-/// the open-time verdict.
-pub(super) unsafe fn probe_rgb_direct(
-    instance: &ash::Instance,
-    vq_inst: &ash::khr::video_queue::Instance,
-    pd: vk::PhysicalDevice,
-    codec_op: vk::VideoCodecOperationFlagsKHR,
-    av1: bool,
-) -> Result<(u32, u32), &'static str> {
-    use crate::vk_av1_encode as av1b;
-    use crate::vk_valve_rgb as vrgb;
-    // 1. The device extension must exist (Mesa >= 26.0 AND the VCN has an EFC block).
-    let Ok(exts) = instance.enumerate_device_extension_properties(pd) else {
-        return Err("probe-failed(ext-enum)");
-    };
-    if !exts
-        .iter()
-        .any(|e| std::ffi::CStr::from_ptr(e.extension_name.as_ptr()) == vrgb::EXTENSION_NAME)
-    {
-        return Err("no-ext(mesa<26.0-or-no-efc)");
-    }
-    // 2. Feature bit.
-    let mut feat = vrgb::PhysicalDeviceVideoEncodeRgbConversionFeaturesVALVE {
-        s_type: vrgb::stype(vrgb::ST_PHYSICAL_DEVICE_FEATURES),
-        p_next: std::ptr::null_mut(),
-        video_encode_rgb_conversion: vk::FALSE,
-    };
-    let mut f2 = vk::PhysicalDeviceFeatures2 {
-        p_next: &mut feat as *mut _ as *mut c_void,
-        ..Default::default()
-    };
-    instance.get_physical_device_features2(pd, &mut f2);
-    if feat.video_encode_rgb_conversion == vk::FALSE {
-        return Err("no-feature");
-    }
-    // 3. Capabilities under the rgb-chained profile — the conversion must cover the compute
-    //    CSC's colour math (rgb2yuv.comp: BT.709, narrow range; chroma siting is looser, see
-    //    below). The profile chain is the same one every rgb-direct consumer presents.
-    let mut ps = RgbProfileStack::new(codec_op);
-    let profile = *ps.wire(av1);
-    let mut rgb_caps = vrgb::VideoEncodeRgbConversionCapabilitiesVALVE {
-        s_type: vrgb::stype(vrgb::ST_CAPABILITIES),
-        p_next: std::ptr::null_mut(),
-        rgb_models: 0,
-        rgb_ranges: 0,
-        x_chroma_offsets: 0,
-        y_chroma_offsets: 0,
-    };
-    let mut h265_caps = vk::VideoEncodeH265CapabilitiesKHR::default();
-    let mut av1_caps: av1b::VideoEncodeAV1CapabilitiesKHR = std::mem::zeroed();
-    av1_caps.s_type = av1b::stype(av1b::ST_CAPABILITIES);
-    let mut enc_caps = vk::VideoEncodeCapabilitiesKHR::default();
-    let mut caps = vk::VideoCapabilitiesKHR::default();
-    if av1 {
-        av1_caps.p_next = &mut rgb_caps as *mut _ as *mut c_void;
-        enc_caps.p_next = &mut av1_caps as *mut _ as *mut c_void;
-    } else {
-        h265_caps.p_next = &mut rgb_caps as *mut _ as *mut c_void;
-        enc_caps.p_next = &mut h265_caps as *mut _ as *mut c_void;
-    }
-    caps.p_next = &mut enc_caps as *mut _ as *mut c_void;
-    let r = (vq_inst.fp().get_physical_device_video_capabilities_khr)(pd, &profile, &mut caps);
-    if r != vk::Result::SUCCESS {
-        return Err("no-rgb-profile(caps)");
-    }
-    // Colour model + range must match the shader exactly (709 narrow). Chroma siting is looser
-    // BY ON-GLASS FINDING (RADV 26.0.4 / 780M): the VCN EFC advertises x=COSITED_EVEN only —
-    // the canonical H.26x left-cosited siting — while our 2x2-average shader is midpoint. The
-    // difference is a half-pel chroma-x phase, imperceptible (and EFC's is arguably the more
-    // correct one since nothing in our bitstream signals siting). Accept either bit per axis
-    // and choose the closest to the shader's math: midpoint if offered, else cosited-even.
-    let pick = |offered: u32| -> Option<u32> {
-        if offered & vrgb::CHROMA_OFFSET_MIDPOINT != 0 {
-            Some(vrgb::CHROMA_OFFSET_MIDPOINT)
-        } else if offered & vrgb::CHROMA_OFFSET_COSITED_EVEN != 0 {
-            Some(vrgb::CHROMA_OFFSET_COSITED_EVEN)
-        } else {
-            None
-        }
-    };
-    if rgb_caps.rgb_models & vrgb::MODEL_YCBCR_709 == 0
-        || rgb_caps.rgb_ranges & vrgb::RANGE_NARROW == 0
-    {
-        return Err("no-709-narrow");
-    }
-    let (Some(x_offset), Some(y_offset)) = (
-        pick(rgb_caps.x_chroma_offsets),
-        pick(rgb_caps.y_chroma_offsets),
-    ) else {
-        return Err("no-chroma-siting");
-    };
-    // 4. The encode-src format set under this profile must offer BGRA with DRM-modifier tiling —
-    //    the capture hands LINEAR BGRx dmabufs (fourcc XR24), which import as B8G8R8A8_UNORM.
-    let profile_arr = [profile];
-    let plist = vk::VideoProfileListInfoKHR::default().profiles(&profile_arr);
-    let mut fmt_info = vk::PhysicalDeviceVideoFormatInfoKHR::default()
-        .image_usage(vk::ImageUsageFlags::VIDEO_ENCODE_SRC_KHR);
-    fmt_info.p_next = &plist as *const _ as *const c_void;
-    let get_fmt = vq_inst.fp().get_physical_device_video_format_properties_khr;
-    let mut count = 0u32;
-    let r = get_fmt(pd, &fmt_info, &mut count, std::ptr::null_mut());
-    if r != vk::Result::SUCCESS || count == 0 {
-        return Err("no-rgb-format");
-    }
-    let mut props = vec![vk::VideoFormatPropertiesKHR::default(); count as usize];
-    let r = get_fmt(pd, &fmt_info, &mut count, props.as_mut_ptr());
-    if r != vk::Result::SUCCESS && r != vk::Result::INCOMPLETE {
-        return Err("no-rgb-format");
-    }
-    if !props[..count as usize].iter().any(|p| {
-        p.format == vk::Format::B8G8R8A8_UNORM
-            && p.image_tiling == vk::ImageTiling::DRM_FORMAT_MODIFIER_EXT
-    }) {
-        return Err("no-bgra-modifier-tiling");
-    }
-    Ok((x_offset, y_offset))
-}
-
-pub(super) unsafe fn make_video_image(
-    device: &ash::Device,
-    mp: &vk::PhysicalDeviceMemoryProperties,
-    fmt: vk::Format,
-    w: u32,
-    h: u32,
-    layers: u32,
-    usage: vk::ImageUsageFlags,
-    profile_list: &mut vk::VideoProfileListInfoKHR,
-    concurrent: &[u32],
-) -> Result<(vk::Image, vk::DeviceMemory)> {
-    let mut ci = vk::ImageCreateInfo::default()
-        .image_type(vk::ImageType::TYPE_2D)
-        .format(fmt)
-        .extent(vk::Extent3D {
-            width: w,
-            height: h,
-            depth: 1,
-        })
-        .mip_levels(1)
-        .array_layers(layers)
-        .samples(vk::SampleCountFlags::TYPE_1)
-        .tiling(vk::ImageTiling::OPTIMAL)
-        .usage(usage)
-        .initial_layout(vk::ImageLayout::UNDEFINED)
-        .push_next(profile_list);
-    if concurrent.len() >= 2 {
-        ci = ci
-            .sharing_mode(vk::SharingMode::CONCURRENT)
-            .queue_family_indices(concurrent);
-    } else {
-        ci = ci.sharing_mode(vk::SharingMode::EXCLUSIVE);
-    }
-    let img = device.create_image(&ci, None)?;
-    let req = device.get_image_memory_requirements(img);
-    // Unwind on failure: callers (the open path) only ever see the completed pair.
-    let mem = match device.allocate_memory(
-        &vk::MemoryAllocateInfo::default()
-            .allocation_size(req.size)
-            .memory_type_index(find_mem(
-                mp,
-                req.memory_type_bits,
-                vk::MemoryPropertyFlags::DEVICE_LOCAL,
-            )),
-        None,
-    ) {
-        Ok(m) => m,
-        Err(e) => {
-            device.destroy_image(img, None);
-            return Err(e.into());
-        }
-    };
-    if let Err(e) = device.bind_image_memory(img, mem, 0) {
-        device.destroy_image(img, None);
-        device.free_memory(mem, None);
-        return Err(e.into());
-    }
-    Ok((img, mem))
-}
-
-/// Build one in-flight frame's private resources: NV12 encode-src, Y/UV CSC scratch, its CSC
-/// descriptor set (Y/UV bound now, RGB per use), the bitstream buffer + feedback query, and the
-/// per-frame command buffers + sync. `profile_list`/`profile` are borrowed only during creation.
-///
-/// Builds in place into `f` — a [`Frame::default`] the caller has already parked in its
-/// [`VkTeardown`] guard — so every handle is owned by the unwind the moment it exists and a
-/// mid-build failure leaks nothing.
-pub(super) unsafe fn make_frame(
-    device: &ash::Device,
-    mem_props: &vk::PhysicalDeviceMemoryProperties,
-    w: u32,
-    h: u32,
-    fams: &[u32],
-    profile: &vk::VideoProfileInfoKHR,
-    profile_list: &mut vk::VideoProfileListInfoKHR,
-    csc_dsl: vk::DescriptorSetLayout,
-    csc_pool: vk::DescriptorPool,
-    cmd_pool: vk::CommandPool,
-    compute_pool: vk::CommandPool,
-    bs_size: u64,
-    sampler: vk::Sampler,
-    with_ts: bool,
-    csc: bool,
-    pad_fmt: Option<vk::Format>,
-    f: &mut Frame,
-) -> Result<()> {
-    // "no cursor uploaded yet" sentinel — a real serial may be 0 (see `prep_cursor`).
-    f.cursor_serial = u64::MAX;
-    // Padded-copy staging (unaligned-mode RGB-direct or native NV12): an aligned encode-src in
-    // the session's picture format, filled by a transfer blit each frame — concurrent compute
-    // (copy) + encode (source read). TRANSFER_SRC because the width-padding pass self-copies the
-    // staging image's own last visible column (see `record_pad_blit`).
-    if let Some(fmt) = pad_fmt {
-        (f.pad_img, f.pad_mem) = make_video_image(
-            device,
-            mem_props,
-            fmt,
-            w,
-            h,
-            1,
-            vk::ImageUsageFlags::VIDEO_ENCODE_SRC_KHR
-                | vk::ImageUsageFlags::TRANSFER_DST
-                | vk::ImageUsageFlags::TRANSFER_SRC,
-            profile_list,
-            fams,
-        )?;
-        f.pad_view = make_view(device, f.pad_img, fmt, 0)?;
-    }
-    // RGB-direct sessions never touch the CSC pipeline: no NV12 encode-src, no Y/UV scratch, no
-    // cursor overlay, no descriptor set — the encode source is the imported RGB itself (or the
-    // CPU staging image, built lazily). Their Frame keeps the null handles (teardown-safe).
-    if csc {
-        make_frame_csc(
-            device,
-            mem_props,
-            w,
-            h,
-            fams,
-            profile_list,
-            csc_dsl,
-            csc_pool,
-            sampler,
-            f,
-        )?;
-    }
-    make_frame_common(
-        device,
-        mem_props,
-        profile,
-        profile_list,
-        cmd_pool,
-        compute_pool,
-        bs_size,
-        with_ts,
-        f,
-    )
-}
-
-/// The CSC-only half of [`make_frame`]: NV12 encode-src + Y/UV scratch + cursor + descriptors.
-#[allow(clippy::too_many_arguments)]
-unsafe fn make_frame_csc(
-    device: &ash::Device,
-    mem_props: &vk::PhysicalDeviceMemoryProperties,
-    w: u32,
-    h: u32,
-    fams: &[u32],
-    profile_list: &mut vk::VideoProfileListInfoKHR,
-    csc_dsl: vk::DescriptorSetLayout,
-    csc_pool: vk::DescriptorPool,
-    sampler: vk::Sampler,
-    f: &mut Frame,
-) -> Result<()> {
-    // NV12 encode-src (filled by the CSC copy) — concurrent compute+encode.
-    (f.nv12_src, f.nv12_mem) = make_video_image(
-        device,
-        mem_props,
-        NV12,
-        w,
-        h,
-        1,
-        vk::ImageUsageFlags::VIDEO_ENCODE_SRC_KHR | vk::ImageUsageFlags::TRANSFER_DST,
-        profile_list,
-        fams,
-    )?;
-    f.nv12_view = make_view(device, f.nv12_src, NV12, 0)?;
-    // CSC scratch (Y R8 full-res, UV RG8 half-res).
-    (f.y_img, f.y_mem, f.y_view) = make_plain_image(
-        device,
-        mem_props,
-        vk::Format::R8_UNORM,
-        w,
-        h,
-        vk::ImageUsageFlags::STORAGE | vk::ImageUsageFlags::TRANSFER_SRC,
-    )?;
-    (f.uv_img, f.uv_mem, f.uv_view) = make_plain_image(
-        device,
-        mem_props,
-        vk::Format::R8G8_UNORM,
-        w / 2,
-        h / 2,
-        vk::ImageUsageFlags::STORAGE | vk::ImageUsageFlags::TRANSFER_SRC,
-    )?;
-    // Cursor overlay: fixed CURSOR_MAX² RGBA8 sampled image + host staging (cursor-as-metadata). The
-    // view/descriptor is static (bound at binding 3 below); only the image *content* changes, and
-    // only when the pointer bitmap does — see `prep_cursor`.
-    (f.cursor_img, f.cursor_mem, f.cursor_view) = make_plain_image(
-        device,
-        mem_props,
-        vk::Format::R8G8B8A8_UNORM,
-        CURSOR_MAX,
-        CURSOR_MAX,
-        vk::ImageUsageFlags::SAMPLED | vk::ImageUsageFlags::TRANSFER_DST,
-    )?;
-    f.cursor_stage = device.create_buffer(
-        &vk::BufferCreateInfo::default()
-            .size((CURSOR_MAX * CURSOR_MAX * 4) as u64)
-            .usage(vk::BufferUsageFlags::TRANSFER_SRC),
-        None,
-    )?;
-    let cs_req = device.get_buffer_memory_requirements(f.cursor_stage);
-    f.cursor_stage_mem = device.allocate_memory(
-        &vk::MemoryAllocateInfo::default()
-            .allocation_size(cs_req.size)
-            .memory_type_index(find_mem(
-                mem_props,
-                cs_req.memory_type_bits,
-                vk::MemoryPropertyFlags::HOST_VISIBLE | vk::MemoryPropertyFlags::HOST_COHERENT,
-            )),
-        None,
-    )?;
-    device.bind_buffer_memory(f.cursor_stage, f.cursor_stage_mem, 0)?;
-    // Descriptor set — Y/UV storage bindings fixed; binding 0 (RGB) rewritten per use; binding 3
-    // (cursor) points at the static cursor image (its layout is SHADER_READ_ONLY once prepped).
-    let dsls = [csc_dsl];
-    f.csc_set = device.allocate_descriptor_sets(
-        &vk::DescriptorSetAllocateInfo::default()
-            .descriptor_pool(csc_pool)
-            .set_layouts(&dsls),
-    )?[0];
-    let y_info = [vk::DescriptorImageInfo::default()
-        .image_view(f.y_view)
-        .image_layout(vk::ImageLayout::GENERAL)];
-    let uv_info = [vk::DescriptorImageInfo::default()
-        .image_view(f.uv_view)
-        .image_layout(vk::ImageLayout::GENERAL)];
-    let cur_info = [vk::DescriptorImageInfo::default()
-        .sampler(sampler)
-        .image_view(f.cursor_view)
-        .image_layout(vk::ImageLayout::SHADER_READ_ONLY_OPTIMAL)];
-    device.update_descriptor_sets(
-        &[
-            vk::WriteDescriptorSet::default()
-                .dst_set(f.csc_set)
-                .dst_binding(1)
-                .descriptor_type(vk::DescriptorType::STORAGE_IMAGE)
-                .image_info(&y_info),
-            vk::WriteDescriptorSet::default()
-                .dst_set(f.csc_set)
-                .dst_binding(2)
-                .descriptor_type(vk::DescriptorType::STORAGE_IMAGE)
-                .image_info(&uv_info),
-            vk::WriteDescriptorSet::default()
-                .dst_set(f.csc_set)
-                .dst_binding(3)
-                .descriptor_type(vk::DescriptorType::COMBINED_IMAGE_SAMPLER)
-                .image_info(&cur_info),
-        ],
-        &[],
-    );
-    Ok(())
-}
-
-/// The mode-independent half of [`make_frame`]: bitstream buffer (+ persistent map), feedback
-/// query, optional timestamp pool, command buffers and sync objects.
-#[allow(clippy::too_many_arguments)]
-unsafe fn make_frame_common(
-    device: &ash::Device,
-    mem_props: &vk::PhysicalDeviceMemoryProperties,
-    profile: &vk::VideoProfileInfoKHR,
-    profile_list: &mut vk::VideoProfileListInfoKHR,
-    cmd_pool: vk::CommandPool,
-    compute_pool: vk::CommandPool,
-    bs_size: u64,
-    with_ts: bool,
-    f: &mut Frame,
-) -> Result<()> {
-    // Bitstream buffer + feedback query.
-    f.bs_buf = device.create_buffer(
-        &vk::BufferCreateInfo::default()
-            .size(bs_size)
-            .usage(vk::BufferUsageFlags::VIDEO_ENCODE_DST_KHR)
-            .push_next(profile_list),
-        None,
-    )?;
-    let bs_req = device.get_buffer_memory_requirements(f.bs_buf);
-    f.bs_mem = device.allocate_memory(
-        &vk::MemoryAllocateInfo::default()
-            .allocation_size(bs_req.size)
-            .memory_type_index(find_mem(
-                mem_props,
-                bs_req.memory_type_bits,
-                vk::MemoryPropertyFlags::HOST_VISIBLE | vk::MemoryPropertyFlags::HOST_COHERENT,
-            )),
-        None,
-    )?;
-    device.bind_buffer_memory(f.bs_buf, f.bs_mem, 0)?;
-    // Map once for the slot's lifetime — read_slot copies AUs straight out of this (coherent
-    // memory, no per-frame map/unmap); vkFreeMemory implicitly unmaps at teardown.
-    f.bs_ptr = BsPtr(
-        device.map_memory(f.bs_mem, 0, vk::WHOLE_SIZE, vk::MemoryMapFlags::empty())? as *const u8,
-    );
-    // PUNKTFUNK_PERF: a 2-slot timestamp pool bracketing this slot's compute batch (CSC split).
-    if with_ts {
-        f.ts_pool = device.create_query_pool(
-            &vk::QueryPoolCreateInfo::default()
-                .query_type(vk::QueryType::TIMESTAMP)
-                .query_count(2),
-            None,
-        )?;
-    }
-    let mut fb_ci = vk::QueryPoolVideoEncodeFeedbackCreateInfoKHR::default().encode_feedback_flags(
-        vk::VideoEncodeFeedbackFlagsKHR::BITSTREAM_BUFFER_OFFSET
-            | vk::VideoEncodeFeedbackFlagsKHR::BITSTREAM_BYTES_WRITTEN,
-    );
-    fb_ci.p_next = profile as *const _ as *const c_void;
-    let mut query_ci = vk::QueryPoolCreateInfo::default()
-        .query_type(vk::QueryType::VIDEO_ENCODE_FEEDBACK_KHR)
-        .query_count(1);
-    query_ci.p_next = &fb_ci as *const _ as *const c_void;
-    f.query_pool = device.create_query_pool(&query_ci, None)?;
-    // Command buffers + per-frame sync.
-    f.cmd = device.allocate_command_buffers(
-        &vk::CommandBufferAllocateInfo::default()
-            .command_pool(cmd_pool)
-            .command_buffer_count(1),
-    )?[0];
-    f.compute_cmd = device.allocate_command_buffers(
-        &vk::CommandBufferAllocateInfo::default()
-            .command_pool(compute_pool)
-            .command_buffer_count(1),
-    )?[0];
-    f.csc_sem = device.create_semaphore(&vk::SemaphoreCreateInfo::default(), None)?;
-    f.fence = device.create_fence(&vk::FenceCreateInfo::default(), None)?;
-    Ok(())
-}
-
-/// Author VPS/SPS/PPS (Main, level 4.0, low-latency, conformance-window crop) and return the
-/// session-parameters object + the encoded header bytes (VPS+SPS+PPS NALs) for keyframes.
-pub(super) unsafe fn build_parameters_h265(
-    device: &ash::Device,
-    vq_dev: &ash::khr::video_queue::Device,
-    venc_dev: &ash::khr::video_encode_queue::Device,
-    session: vk::VideoSessionKHR,
-    w: u32,
-    h: u32,
-    rw: u32,
-    rh: u32,
-    quality_level: u32,
-) -> Result<(vk::VideoSessionParametersKHR, Vec<u8>)> {
-    use ash::vk::native as hh;
-    let mut ptl: hh::StdVideoH265ProfileTierLevel = std::mem::zeroed();
-    ptl.flags.set_general_progressive_source_flag(1);
-    ptl.flags.set_general_frame_only_constraint_flag(1);
-    ptl.general_profile_idc = hh::StdVideoH265ProfileIdc_STD_VIDEO_H265_PROFILE_IDC_MAIN;
-    ptl.general_level_idc = hh::StdVideoH265LevelIdc_STD_VIDEO_H265_LEVEL_IDC_6_0;
-
-    let mut dpbm: hh::StdVideoH265DecPicBufMgr = std::mem::zeroed();
-    dpbm.max_dec_pic_buffering_minus1[0] = (DPB_SLOTS - 1) as u8;
-    dpbm.max_num_reorder_pics[0] = 0;
-    dpbm.max_latency_increase_plus1[0] = 0;
-
-    let mut vps: hh::StdVideoH265VideoParameterSet = std::mem::zeroed();
-    vps.flags.set_vps_temporal_id_nesting_flag(1);
-    vps.flags.set_vps_sub_layer_ordering_info_present_flag(1);
-    vps.pDecPicBufMgr = &dpbm;
-    vps.pProfileTierLevel = &ptl;
-
-    let mut sps: hh::StdVideoH265SequenceParameterSet = std::mem::zeroed();
-    sps.flags.set_sps_temporal_id_nesting_flag(1);
-    sps.flags.set_sps_sub_layer_ordering_info_present_flag(1);
-    sps.chroma_format_idc = hh::StdVideoH265ChromaFormatIdc_STD_VIDEO_H265_CHROMA_FORMAT_IDC_420;
-    sps.pic_width_in_luma_samples = w;
-    sps.pic_height_in_luma_samples = h;
-    sps.log2_max_pic_order_cnt_lsb_minus4 = 4;
-    sps.log2_diff_max_min_luma_coding_block_size = 3;
-    sps.log2_diff_max_min_luma_transform_block_size = 3;
-    sps.max_transform_hierarchy_depth_inter = 4;
-    sps.max_transform_hierarchy_depth_intra = 4;
-    sps.pProfileTierLevel = &ptl;
-    sps.pDecPicBufMgr = &dpbm;
-    if w != rw || h != rh {
-        sps.flags.set_conformance_window_flag(1);
-        sps.conf_win_right_offset = (w - rw) / 2; // 4:2:0 SubWidthC = 2
-        sps.conf_win_bottom_offset = (h - rh) / 2; // 4:2:0 SubHeightC = 2
-    }
-
-    let mut pps: hh::StdVideoH265PictureParameterSet = std::mem::zeroed();
-    pps.flags.set_cu_qp_delta_enabled_flag(1);
-    pps.flags.set_pps_loop_filter_across_slices_enabled_flag(1);
-
-    let vps_arr = [vps];
-    let sps_arr = [sps];
-    let pps_arr = [pps];
-    let add = vk::VideoEncodeH265SessionParametersAddInfoKHR::default()
-        .std_vp_ss(&vps_arr)
-        .std_sp_ss(&sps_arr)
-        .std_pp_ss(&pps_arr);
-    let mut h265_ci = vk::VideoEncodeH265SessionParametersCreateInfoKHR::default()
-        .max_std_vps_count(1)
-        .max_std_sps_count(1)
-        .max_std_pps_count(1)
-        .parameters_add_info(&add);
-    // Bake the session's quality level into the parameters object — the spec requires it to match
-    // the level the first frame's ENCODE_QUALITY_LEVEL control installs.
-    let mut q_info = vk::VideoEncodeQualityLevelInfoKHR::default().quality_level(quality_level);
-    let ci = vk::VideoSessionParametersCreateInfoKHR::default()
-        .video_session(session)
-        .push_next(&mut h265_ci)
-        .push_next(&mut q_info);
-    let mut params = vk::VideoSessionParametersKHR::null();
-    let r = (vq_dev.fp().create_video_session_parameters_khr)(
-        device.handle(),
-        &ci,
-        std::ptr::null(),
-        &mut params,
-    );
-    if r != vk::Result::SUCCESS {
-        bail!("create_video_session_parameters: {r:?}");
-    }
-
-    let mut get_h265 = vk::VideoEncodeH265SessionParametersGetInfoKHR::default()
-        .write_std_vps(true)
-        .write_std_sps(true)
-        .write_std_pps(true)
-        .std_vps_id(0)
-        .std_sps_id(0)
-        .std_pps_id(0);
-    let get = vk::VideoEncodeSessionParametersGetInfoKHR::default()
-        .video_session_parameters(params)
-        .push_next(&mut get_h265);
-    let get_fn = venc_dev.fp().get_encoded_video_session_parameters_khr;
-    let mut fb = vk::VideoEncodeSessionParametersFeedbackInfoKHR::default();
-    let mut size: usize = 0;
-    let r = get_fn(
-        device.handle(),
-        &get,
-        &mut fb,
-        &mut size,
-        std::ptr::null_mut(),
-    );
-    if r != vk::Result::SUCCESS {
-        // `params` is live but not yet the caller's guard's to unwind — destroy before bailing.
-        (vq_dev.fp().destroy_video_session_parameters_khr)(
-            device.handle(),
-            params,
-            std::ptr::null(),
-        );
-        bail!("get header size: {r:?}");
-    }
-    let mut buf = vec![0u8; size];
-    let r = get_fn(
-        device.handle(),
-        &get,
-        &mut fb,
-        &mut size,
-        buf.as_mut_ptr() as *mut c_void,
-    );
-    if r != vk::Result::SUCCESS {
-        (vq_dev.fp().destroy_video_session_parameters_khr)(
-            device.handle(),
-            params,
-            std::ptr::null(),
-        );
-        bail!("get header bytes: {r:?}");
-    }
-    buf.truncate(size);
-    Ok((params, buf))
-}
-
-/// AV1 low-overhead OBU bit-writer (MSB-first), used to hand-pack the sequence-header OBU that
-/// Vulkan AV1 encode (unlike H26x) never emits itself.
-struct Av1BitWriter {
-    buf: Vec<u8>,
-    cur: u8,
-    fill: u8,
-}
-impl Av1BitWriter {
-    fn new() -> Self {
-        Self {
-            buf: Vec::new(),
-            cur: 0,
-            fill: 0,
-        }
-    }
-    fn bit(&mut self, b: u32) {
-        self.cur = (self.cur << 1) | (b as u8 & 1);
-        self.fill += 1;
-        if self.fill == 8 {
-            self.buf.push(self.cur);
-            self.cur = 0;
-            self.fill = 0;
-        }
-    }
-    fn put(&mut self, val: u32, bits: u32) {
-        for i in (0..bits).rev() {
-            self.bit((val >> i) & 1);
-        }
-    }
-    /// Flush, zero-padding the final partial byte (OBU size field delimits the payload).
-    fn finish(mut self) -> Vec<u8> {
-        if self.fill > 0 {
-            self.cur <<= 8 - self.fill;
-            self.buf.push(self.cur);
-        }
-        self.buf
-    }
-}
-
-/// AV1 leb128 (little-endian base-128) encoding of an OBU size.
-fn leb128(mut v: u64) -> Vec<u8> {
-    let mut out = Vec::new();
-    loop {
-        let mut byte = (v & 0x7f) as u8;
-        v >>= 7;
-        if v != 0 {
-            byte |= 0x80;
-        }
-        out.push(byte);
-        if v == 0 {
-            break;
-        }
-    }
-    out
-}
-
-/// Bit-pack a `sequence_header_obu` (AV1 spec §5.5) into a size-delimited OBU. The field values here
-/// MUST mirror the `StdVideoAV1SequenceHeader` handed to the driver in `build_parameters_av1` so the
-/// driver-emitted frame OBUs parse against this header. Single operating point, 8-bit 4:2:0,
-/// order-hint on, CDEF+restoration+filter-intra allowed, everything exotic (compound/warp/superres)
-/// disabled — the profile our single-reference P-frame encoder actually uses.
-fn av1_sequence_header_obu(
-    sb128: bool,
-    fwb: u32,
-    fhb: u32,
-    max_w_m1: u32,
-    max_h_m1: u32,
-    order_hint_bits_minus_1: u32,
-    seq_level_idx: u32,
-) -> Vec<u8> {
-    let mut w = Av1BitWriter::new();
-    w.put(0, 3); // seq_profile = MAIN
-    w.bit(0); // still_picture
-    w.bit(0); // reduced_still_picture_header
-    w.bit(0); // timing_info_present_flag
-    w.bit(0); // initial_display_delay_present_flag
-    w.put(0, 5); // operating_points_cnt_minus_1 = 0
-    w.put(0, 12); // operating_point_idc[0]
-    w.put(seq_level_idx, 5); // seq_level_idx[0]
-    if seq_level_idx > 7 {
-        w.bit(0); // seq_tier[0] = 0
-    }
-    w.put(fwb, 4); // frame_width_bits_minus_1
-    w.put(fhb, 4); // frame_height_bits_minus_1
-    w.put(max_w_m1, fwb + 1); // max_frame_width_minus_1
-    w.put(max_h_m1, fhb + 1); // max_frame_height_minus_1
-    w.bit(0); // frame_id_numbers_present_flag
-    w.bit(sb128 as u32); // use_128x128_superblock
-    w.bit(0); // enable_filter_intra
-    w.bit(0); // enable_intra_edge_filter
-    w.bit(0); // enable_interintra_compound
-    w.bit(0); // enable_masked_compound
-    w.bit(0); // enable_warped_motion
-    w.bit(0); // enable_dual_filter
-    w.bit(1); // enable_order_hint
-    w.bit(0); // enable_jnt_comp
-    w.bit(0); // enable_ref_frame_mvs
-    w.bit(1); // seq_choose_screen_content_tools -> seq_force_screen_content_tools = SELECT
-    w.bit(1); // seq_choose_integer_mv -> seq_force_integer_mv = SELECT
-    w.put(order_hint_bits_minus_1, 3); // order_hint_bits_minus_1
-    w.bit(0); // enable_superres
-    w.bit(0); // enable_cdef
-    w.bit(0); // enable_restoration
-              // color_config(): 8-bit 4:2:0, unspecified primaries/transfer/matrix, limited range
-    w.bit(0); // high_bitdepth
-    w.bit(0); // mono_chrome
-    w.bit(0); // color_description_present_flag
-    w.bit(0); // color_range (studio/limited)
-    w.put(0, 2); // chroma_sample_position = CSP_UNKNOWN (subsampling_x==subsampling_y==1 for profile 0)
-    w.bit(0); // separate_uv_delta_q
-    w.bit(0); // film_grain_params_present
-
-    // trailing_bits(): a stop `1` bit then zero-pad to a byte (the size field delimits the OBU, but
-    // the parser still requires the trailing_one_bit — dav1d/cbs reject a plain zero pad).
-    w.bit(1);
-    let payload = w.finish();
-    let mut obu = vec![0x0au8]; // obu_header: type=OBU_SEQUENCE_HEADER(1), has_size_field=1
-    obu.extend_from_slice(&leb128(payload.len() as u64));
-    obu.extend_from_slice(&payload);
-    obu
-}
-
-/// AV1 session parameters + header framing. Vulkan AV1 encode emits only the per-frame OBU, so we
-/// return the app-owned prefixes: a temporal-delimiter OBU that opens every temporal unit
-/// (`frame_prefix`), and TD + the bit-packed sequence-header OBU for keyframes (`header`).
-#[allow(clippy::too_many_arguments)]
-pub(super) unsafe fn build_parameters_av1(
-    device: &ash::Device,
-    vq_dev: &ash::khr::video_queue::Device,
-    session: vk::VideoSessionKHR,
-    w: u32,
-    h: u32,
-    _rw: u32,
-    _rh: u32,
-    max_level: ash::vk::native::StdVideoAV1Level,
-    sb128: bool,
-    quality_level: u32,
-) -> Result<(vk::VideoSessionParametersKHR, Vec<u8>, Vec<u8>)> {
-    use crate::vk_av1_encode as av1;
-    use ash::vk::native as hh;
-
-    let fwb = 31 - w.leading_zeros(); // av_log2(w): enough bits for max_frame_width_minus_1 = w-1
-    let fhb = 31 - h.leading_zeros();
-    let order_hint_bits_minus_1: u32 = 7; // OrderHintBits = 8
-    let seq_level_idx = max_level; // StdVideoAV1Level's numeric value IS the AV1 seq_level_idx
-
-    // ---- Std sequence header (must match the OBU packed below) ----
-    let mut cc_flags: hh::StdVideoAV1ColorConfigFlags = std::mem::zeroed();
-    let _ = &mut cc_flags; // all zero: mono_chrome/color_range/description/separate_uv_delta_q = 0
-    let mut cc: hh::StdVideoAV1ColorConfig = std::mem::zeroed();
-    cc.flags = cc_flags;
-    cc.BitDepth = 8;
-    cc.subsampling_x = 1;
-    cc.subsampling_y = 1;
-    cc.color_primaries = hh::StdVideoAV1ColorPrimaries_STD_VIDEO_AV1_COLOR_PRIMARIES_BT_UNSPECIFIED;
-    cc.transfer_characteristics =
-        hh::StdVideoAV1TransferCharacteristics_STD_VIDEO_AV1_TRANSFER_CHARACTERISTICS_UNSPECIFIED;
-    cc.matrix_coefficients =
-        hh::StdVideoAV1MatrixCoefficients_STD_VIDEO_AV1_MATRIX_COEFFICIENTS_UNSPECIFIED;
-    cc.chroma_sample_position =
-        hh::StdVideoAV1ChromaSamplePosition_STD_VIDEO_AV1_CHROMA_SAMPLE_POSITION_UNKNOWN;
-
-    // Match FFmpeg's Vulkan AV1 encoder (proven on this RADV/VCN path): the ONLY coding tools
-    // enabled are order-hint and (per caps) 128x128 superblocks. CDEF, loop restoration, filter-
-    // intra, warped/compound motion, superres all OFF — enabling them made VCN emit frame-header
-    // sections whose bit layout our sequence header didn't match, desyncing every inter frame.
-    let mut sh_flags: hh::StdVideoAV1SequenceHeaderFlags = std::mem::zeroed();
-    if sb128 {
-        sh_flags.set_use_128x128_superblock(1);
-    }
-    sh_flags.set_enable_order_hint(1);
-    let mut sh: hh::StdVideoAV1SequenceHeader = std::mem::zeroed();
-    sh.flags = sh_flags;
-    sh.seq_profile = hh::StdVideoAV1Profile_STD_VIDEO_AV1_PROFILE_MAIN;
-    sh.frame_width_bits_minus_1 = fwb as u8;
-    sh.frame_height_bits_minus_1 = fhb as u8;
-    sh.max_frame_width_minus_1 = (w - 1) as u16;
-    sh.max_frame_height_minus_1 = (h - 1) as u16;
-    sh.order_hint_bits_minus_1 = order_hint_bits_minus_1 as u8;
-    sh.seq_force_integer_mv = 2; // SELECT
-    sh.seq_force_screen_content_tools = 2; // SELECT
-    sh.pColorConfig = &cc;
-
-    // ---- single operating point conveying the level/tier the driver targets ----
-    let op = av1::StdVideoEncodeAV1OperatingPointInfo {
-        flags: std::mem::zeroed(),
-        operating_point_idc: 0,
-        seq_level_idx: seq_level_idx as u8,
-        seq_tier: 0,
-        decoder_buffer_delay: 0,
-        encoder_buffer_delay: 0,
-        initial_display_delay_minus_1: 0,
-    };
-    let ops = [op];
-    let av1_spci = av1::VideoEncodeAV1SessionParametersCreateInfoKHR {
-        s_type: av1::stype(av1::ST_SESSION_PARAMETERS_CREATE_INFO),
-        p_next: std::ptr::null(),
-        p_std_sequence_header: &sh,
-        p_std_decoder_model_info: std::ptr::null(),
-        std_operating_point_count: 1,
-        p_std_operating_points: ops.as_ptr() as *const c_void,
-    };
-    // Bake the session's quality level into the parameters object (must match the level the first
-    // frame's ENCODE_QUALITY_LEVEL control installs); chained raw ahead of the vendored AV1 struct.
-    let mut q_info = vk::VideoEncodeQualityLevelInfoKHR::default().quality_level(quality_level);
-    q_info.p_next = &av1_spci as *const _ as *const c_void;
-    let mut ci = vk::VideoSessionParametersCreateInfoKHR::default().video_session(session);
-    ci.p_next = &q_info as *const _ as *const c_void;
-    let mut params = vk::VideoSessionParametersKHR::null();
-    let r = (vq_dev.fp().create_video_session_parameters_khr)(
-        device.handle(),
-        &ci,
-        std::ptr::null(),
-        &mut params,
-    );
-    if r != vk::Result::SUCCESS {
-        bail!("create_video_session_parameters (av1): {r:?}");
-    }
-
-    // ---- header framing: TD every temporal unit; TD + seq-header OBU on keyframes ----
-    let td = vec![0x12u8, 0x00]; // temporal_delimiter OBU (type=2, size=0)
-    let seq_obu = av1_sequence_header_obu(
-        sb128,
-        fwb,
-        fhb,
-        w - 1,
-        h - 1,
-        order_hint_bits_minus_1,
-        seq_level_idx,
-    );
-    let mut keyframe_prefix = td.clone();
-    keyframe_prefix.extend_from_slice(&seq_obu);
-    Ok((params, keyframe_prefix, td))
-}
@@ -7,18 +7,6 @@ use anyhow::Result;
 use ash::vk;
 use pf_frame::PixelFormat;

-/// Whether a device extension is in an enumerated properties list — the gate both Vulkan encode
-/// backends use before enabling `VK_EXT_queue_family_foreign` (Phase 8: the FOREIGN queue-family
-/// barriers were used without the extension ever being enabled; `pf-presenter/dmabuf.rs` is the
-/// in-repo precedent that enables it).
-pub(super) fn ext_advertised(exts: &[vk::ExtensionProperties], name: &std::ffi::CStr) -> bool {
-    exts.iter().any(|e| {
-        // SAFETY: `extension_name` is a spec-guaranteed NUL-terminated UTF-8 byte array inside
-        // the driver-filled `VkExtensionProperties` (VK_MAX_EXTENSION_NAME_SIZE bound).
-        unsafe { std::ffi::CStr::from_ptr(e.extension_name.as_ptr()) == name }
-    })
-}
-
 pub(crate) fn color_range(layer: u32) -> vk::ImageSubresourceRange {
    vk::ImageSubresourceRange {
        aspect_mask: vk::ImageAspectFlags::COLOR,
@@ -66,59 +54,6 @@ pub(crate) fn pixel_to_vk(fmt: PixelFormat) -> Option<vk::Format> {
    }
 }

-/// Normalize a CPU RGB payload for Vulkan upload. The packed 24-bpp `Rgb`/`Bgr` the PipeWire
-/// capturer can negotiate are expanded 3→4 into `scratch` (kept by the caller across frames — no
-/// per-frame allocation) with the pad byte = 0xFF; refusing them instead used to kill a session
-/// at its first frame (WP5.4). No packed 24-bpp VkFormat is reliably uploadable/sampleable on
-/// target GPUs, and this path is CPU-sourced by definition, so one cheap expand pass serves it
-/// (the same call NVENC answers with its swscale 3→4 expand, WP1.4).
-///
-/// `bgra_target = false` (the CSC paths): channel order is preserved — the sampler reads through
-/// the matching view format, so any 4-bpp order works and 4-bpp inputs pass through borrowed.
-/// `bgra_target = true` (the RGB-direct encode source): the output byte order is forced to
-/// B,G,R,X, because the video session's `pictureFormat` is `B8G8R8A8_UNORM` and
-/// VUID-vkCmdEncodeVideoKHR-pEncodeInfo-08207 requires the source image to match it — an
-/// R-first source (`Rgbx`/`Rgba`/`Rgb`) is channel-swapped during the same pass. (Caught live on
-/// RADV by `vulkan_smoke_rgb_cpu24`; the mismatch predates the 24-bpp support for `Rgbx` CPU
-/// sources.)
-///
-/// Payloads are tightly packed with no row padding (`FramePayload::Cpu`'s contract), so the
-/// conversion is row-agnostic; a truncated source yields a truncated output, which the upload
-/// paths already bound-check exactly as they did the raw bytes.
-pub(crate) fn normalize_cpu_rgb<'a>(
-    fmt: PixelFormat,
-    bytes: &'a [u8],
-    scratch: &'a mut Vec<u8>,
-    bgra_target: bool,
-) -> (PixelFormat, &'a [u8]) {
-    // Per-pixel source layout: bytes-per-pixel + where R, G, B sit in each pixel.
-    let (bpp, r, g, b) = match fmt {
-        PixelFormat::Rgb => (3usize, 0usize, 1usize, 2usize),
-        PixelFormat::Bgr => (3, 2, 1, 0),
-        PixelFormat::Rgbx | PixelFormat::Rgba => (4, 0, 1, 2),
-        PixelFormat::Bgrx | PixelFormat::Bgra => (4, 2, 1, 0),
-        _ => return (fmt, bytes),
-    };
-    if bpp == 4 && (!bgra_target || b == 0) {
-        return (fmt, bytes); // 4-bpp in an acceptable order: borrow untouched
-    }
-    let px = bytes.len() / bpp;
-    scratch.clear();
-    scratch.resize(px * 4, 0xFF);
-    let (dr, dg, db) = if bgra_target { (2, 1, 0) } else { (r, g, b) };
-    for (dst, src) in scratch.chunks_exact_mut(4).zip(bytes.chunks_exact(bpp)) {
-        dst[dr] = src[r];
-        dst[dg] = src[g];
-        dst[db] = src[b];
-    }
-    let out_fmt = if bgra_target || b == 0 {
-        PixelFormat::Bgrx
-    } else {
-        PixelFormat::Rgbx
-    };
-    (out_fmt, scratch.as_slice())
-}
-
 pub(crate) unsafe fn make_view(
    device: &ash::Device,
    image: vk::Image,
@@ -135,21 +70,6 @@ pub(crate) unsafe fn make_view(
    )?)
 }

-/// Whether a failed dmabuf import should count toward pf-zerocopy's raw-dmabuf degrade latch
-/// (`note_raw_dmabuf_import_failure` — 3 consecutive failures flip capture to CPU delivery for
-/// the process). Deterministic refusals (unsupported fourcc, the driver rejecting the buffer)
-/// must count — they repeat identically forever and the latch is their only recovery. Transient
-/// VRAM pressure must NOT: three tight allocation OOMs would otherwise permanently downgrade a
-/// working host to CPU capture.
-pub(crate) fn import_failure_feeds_latch(e: &anyhow::Error) -> bool {
-    match e.downcast_ref::<vk::Result>() {
-        Some(&r) => {
-            r != vk::Result::ERROR_OUT_OF_DEVICE_MEMORY && r != vk::Result::ERROR_OUT_OF_HOST_MEMORY
-        }
-        None => true,
-    }
-}
-
 /// Import a packed-RGB dmabuf as a SAMPLED VkImage (explicit DRM modifier). Caller destroys all
 /// three returned handles. Extracted verbatim from `vulkan_video.rs`'s import path.
 pub(crate) unsafe fn import_rgb_dmabuf(
@@ -188,15 +108,9 @@ pub(crate) unsafe fn import_rgb_dmabuf_as(
    profile_list: Option<&mut vk::VideoProfileListInfoKHR>,
 ) -> Result<(vk::Image, vk::DeviceMemory, vk::ImageView)> {
    use anyhow::Context;
-    use std::os::fd::{AsRawFd, IntoRawFd};
+    use std::os::fd::IntoRawFd;
    let fmt = fourcc_to_vk(d.fourcc)
        .with_context(|| format!("unsupported dmabuf fourcc {:#x}", d.fourcc))?;
-    // Dup the fd FIRST, and keep it OWNED: ownership transfers to Vulkan only on a SUCCESSFUL
-    // `allocate_memory` (VK_KHR_external_memory_fd — from then on `vkFreeMemory` closes it), so
-    // the release below sits in exactly that arm. Every earlier failure drops the `OwnedFd` for
-    // a single clean close. An explicit `close` after a successful import would be a double
-    // close — and a recycled fd number then clobbers an unrelated descriptor in this process.
-    let dup = d.fd.try_clone().context("dup dmabuf fd")?;
    let planes: Vec<vk::SubresourceLayout> = if fmt == vk::Format::G8_B8R8_2PLANE_420_UNORM {
        let (uv_offset, uv_stride) = d.plane1.map(|(o, s)| (o as u64, s as u64)).unwrap_or((
            d.offset as u64 + d.stride as u64 * ch as u64,
@@ -241,16 +155,14 @@ pub(crate) unsafe fn import_rgb_dmabuf_as(
        ci = ci.push_next(pl);
    }
    let img = device.create_image(&ci, None)?;
-    // Unwind discipline below mirrors `make_plain_image`: every failure destroys what this call
-    // created (and ONLY that — the caller's `DmabufFrame` fd stays theirs).
+    // dup the fd; Vulkan takes ownership of the dup on a successful import.
+    let dup = d.fd.try_clone().context("dup dmabuf fd")?.into_raw_fd();
    let fd_props = {
        let mut p = vk::MemoryFdPropertiesKHR::default();
-        // Borrow-only query (no ownership transfer); an error leaves memory_type_bits = 0 and
-        // the fallback below uses the image requirements alone.
        let _ = (ext_fd.fp().get_memory_fd_properties_khr)(
            device.handle(),
            vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT,
-            dup.as_raw_fd(),
+            dup,
            &mut p,
        );
        p.memory_type_bits
@@ -269,85 +181,25 @@ pub(crate) unsafe fn import_rgb_dmabuf_as(
    let mut ded = vk::MemoryDedicatedAllocateInfo::default().image(img);
    let mut import = vk::ImportMemoryFdInfoKHR::default()
        .handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT)
-        .fd(dup.as_raw_fd());
-    let mem = match device.allocate_memory(
+        .fd(dup);
+    let mem = device.allocate_memory(
        &vk::MemoryAllocateInfo::default()
            .allocation_size(req.size)
            .memory_type_index(ti)
            .push_next(&mut ded)
            .push_next(&mut import),
        None,
-    ) {
-        Ok(mem) => {
-            // Success transferred fd ownership to the memory object — release, don't close.
-            let _ = dup.into_raw_fd();
-            mem
-        }
-        Err(e) => {
-            device.destroy_image(img, None);
-            return Err(e.into()); // `dup` drops here: the one close of the failed import's fd
-        }
-    };
-    if let Err(e) = device.bind_image_memory(img, mem, 0) {
-        device.destroy_image(img, None);
-        device.free_memory(mem, None); // closes the imported fd
-        return Err(e.into());
-    }
-    let view = match device.create_image_view(
+    )?;
+    device.bind_image_memory(img, mem, 0)?;
+    let view = device.create_image_view(
        &vk::ImageViewCreateInfo::default()
            .image(img)
            .view_type(vk::ImageViewType::TYPE_2D)
            .format(fmt)
            .subresource_range(color_range(0)),
        None,
-    ) {
-        Ok(v) => v,
-        Err(e) => {
-            device.destroy_image(img, None);
-            device.free_memory(mem, None);
-            return Err(e.into());
-        }
-    };
-    Ok((img, mem, view))
-}
-
-/// Create + allocate + bind a host-visible/coherent buffer with `make_plain_image`'s unwind
-/// discipline: on any failure everything this call created is destroyed before returning, so
-/// callers can `?` freely. Both `ensure_cpu_rgb` staging twins open-coded this sequence and
-/// leaked the buffer (and then buffer+memory) on the allocate/bind failure arms.
-pub(crate) unsafe fn make_host_buffer(
-    device: &ash::Device,
-    mp: &vk::PhysicalDeviceMemoryProperties,
-    size: u64,
-    usage: vk::BufferUsageFlags,
-) -> Result<(vk::Buffer, vk::DeviceMemory)> {
-    let buf = device.create_buffer(
-        &vk::BufferCreateInfo::default().size(size).usage(usage),
-        None,
    )?;
-    let req = device.get_buffer_memory_requirements(buf);
-    let mem = match device.allocate_memory(
-        &vk::MemoryAllocateInfo::default()
-            .allocation_size(req.size)
-            .memory_type_index(find_mem(
-                mp,
-                req.memory_type_bits,
-                vk::MemoryPropertyFlags::HOST_VISIBLE | vk::MemoryPropertyFlags::HOST_COHERENT,
-            )),
-        None,
-    ) {
-        Ok(m) => m,
-        Err(e) => {
-            device.destroy_buffer(buf, None);
-            return Err(e.into());
-        }
-    };
-    if let Err(e) = device.bind_buffer_memory(buf, mem, 0) {
-        device.destroy_buffer(buf, None);
-        device.free_memory(mem, None);
-        return Err(e.into());
-    }
-    Ok((buf, mem))
+    Ok((img, mem, view))
 }

 pub(crate) unsafe fn make_plain_image(
@@ -407,98 +259,3 @@ pub(crate) unsafe fn make_plain_image(
        }
    }
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn ext_advertised_matches_exact_name() {
-        let mut e = ash::vk::ExtensionProperties::default();
-        let name = b"VK_EXT_queue_family_foreign\0";
-        for (i, b) in name.iter().enumerate() {
-            e.extension_name[i] = *b as std::ffi::c_char;
-        }
-        let exts = [ash::vk::ExtensionProperties::default(), e];
-        assert!(super::ext_advertised(
-            &exts,
-            ash::ext::queue_family_foreign::NAME
-        ));
-        assert!(!super::ext_advertised(
-            &exts[..1],
-            ash::ext::queue_family_foreign::NAME
-        ));
-    }
-
-    use super::*;
-
-    /// CSC mode (`bgra_target = false`): the 3→4 expand is a pure byte shuffle — no channel
-    /// reorder, pad byte 0xFF, truncated tail pixels dropped (never overrun) — and 4-bpp inputs
-    /// pass through borrowed untouched.
-    #[test]
-    fn normalize_cpu_rgb_expands_24bpp_and_borrows_4bpp() {
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Rgb, &[1, 2, 3, 4, 5, 6], &mut scratch, false);
-        assert_eq!(f, PixelFormat::Rgbx);
-        assert_eq!(b, &[1, 2, 3, 0xFF, 4, 5, 6, 0xFF]);
-
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Bgr, &[9, 8, 7], &mut scratch, false);
-        assert_eq!(f, PixelFormat::Bgrx);
-        assert_eq!(b, &[9, 8, 7, 0xFF]);
-
-        // Truncated tail: 5 bytes = one whole pixel + a 2-byte remainder that must be dropped.
-        let mut scratch = Vec::new();
-        let (_, b) = normalize_cpu_rgb(PixelFormat::Rgb, &[1, 2, 3, 4, 5], &mut scratch, false);
-        assert_eq!(b, &[1, 2, 3, 0xFF]);
-
-        // 4-bpp passthrough: borrowed, scratch untouched.
-        let src = [10u8, 20, 30, 40];
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Bgrx, &src, &mut scratch, false);
-        assert_eq!(f, PixelFormat::Bgrx);
-        assert!(std::ptr::eq(b.as_ptr(), src.as_ptr()));
-        assert!(scratch.is_empty());
-
-        // The 4-bpp mapping the expand lands on matches pixel_to_vk's existing table.
-        assert_eq!(
-            pixel_to_vk(PixelFormat::Rgbx),
-            Some(vk::Format::R8G8B8A8_UNORM)
-        );
-        assert_eq!(
-            pixel_to_vk(PixelFormat::Bgrx),
-            Some(vk::Format::B8G8R8A8_UNORM)
-        );
-    }
-
-    /// RGB-direct mode (`bgra_target = true`): everything lands in B,G,R,X order because the
-    /// video session's `pictureFormat` is `B8G8R8A8_UNORM` and the encode source must match it
-    /// (VUID-vkCmdEncodeVideoKHR-pEncodeInfo-08207 — caught live on RADV). B-first inputs pass
-    /// through borrowed; R-first inputs are channel-swapped, 3-bpp and 4-bpp alike.
-    #[test]
-    fn normalize_cpu_rgb_forces_bgra_for_the_encode_source() {
-        // Rgb (R,G,B) → B,G,R,X with the swap folded into the expand.
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Rgb, &[1, 2, 3], &mut scratch, true);
-        assert_eq!(f, PixelFormat::Bgrx);
-        assert_eq!(b, &[3, 2, 1, 0xFF]);
-
-        // Bgr (B,G,R) → same order, expanded.
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Bgr, &[9, 8, 7], &mut scratch, true);
-        assert_eq!(f, PixelFormat::Bgrx);
-        assert_eq!(b, &[9, 8, 7, 0xFF]);
-
-        // Rgbx: 4-bpp but R-first — swapped, alpha replaced by the 0xFF pad.
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Rgbx, &[1, 2, 3, 4], &mut scratch, true);
-        assert_eq!(f, PixelFormat::Bgrx);
-        assert_eq!(b, &[3, 2, 1, 0xFF]);
-
-        // Bgrx/Bgra already match the session order: borrowed untouched.
-        let src = [10u8, 20, 30, 40];
-        let mut scratch = Vec::new();
-        let (f, b) = normalize_cpu_rgb(PixelFormat::Bgra, &src, &mut scratch, true);
-        assert_eq!(f, PixelFormat::Bgra);
-        assert!(std::ptr::eq(b.as_ptr(), src.as_ptr()));
-        assert!(scratch.is_empty());
-    }
-}
@@ -80,74 +80,3 @@ pub struct VideoEncodeSessionRgbConversionCreateInfoVALVE {
 pub fn stype(raw: i32) -> vk::StructureType {
    vk::StructureType::from_raw(raw)
 }
-
-// ---------- ABI layout guard ----------
-//
-// These structs are hand-copied from the registry and handed to the driver through raw `p_next`
-// chains, so nothing in the type system relates them to the C definitions any more: an edit that
-// inserts, drops, widens or re-pads a field is not a compile error, it is the driver reading our
-// bytes at the wrong offsets. The assertions below are the missing compile error. They are `const`
-// rather than `#[cfg(test)]` (the shape `amf.rs` uses) so they hold in every build, including the
-// shipped one, and on any target this module compiles for.
-//
-// What they catch: a changed field width, an inserted or removed field, a changed array length, a
-// padding assumption that only holds on one target. What they CANNOT catch: swapping two fields of
-// the same type — offsets are unchanged. That case is only caught by reading the registry, so the
-// field order here was diffed against `vulkan_core.h` (Vulkan-Headers `main`, 2026-07-25) when
-// these assertions were written, along with every `ST_*` and flag-bit value above.
-//
-// Deliberately duplicated in `vk_av1_encode.rs` rather than shared: both modules exist to be
-// deleted wholesale once `ash` ships these bindings, and a shared helper would make deleting one
-// break the other.
-macro_rules! assert_abi_layout {
-    ($t:ty { size: $size:expr, align: $align:expr $(, $field:ident @ $off:expr)* $(,)? }) => {
-        const _: () = {
-            assert!(
-                ::core::mem::size_of::<$t>() == $size,
-                concat!(stringify!($t), ": size does not match the C ABI")
-            );
-            assert!(
-                ::core::mem::align_of::<$t>() == $align,
-                concat!(stringify!($t), ": alignment does not match the C ABI")
-            );
-            $(assert!(
-                ::core::mem::offset_of!($t, $field) == $off,
-                concat!(stringify!($t), ".", stringify!($field), ": offset does not match the C ABI")
-            );)*
-        };
-    };
-}
-
-assert_abi_layout!(PhysicalDeviceVideoEncodeRgbConversionFeaturesVALVE {
-    size: 24, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    video_encode_rgb_conversion @ 16,
-});
-
-assert_abi_layout!(VideoEncodeRgbConversionCapabilitiesVALVE {
-    size: 32, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    rgb_models @ 16,
-    rgb_ranges @ 20,
-    x_chroma_offsets @ 24,
-    y_chroma_offsets @ 28,
-});
-
-assert_abi_layout!(VideoEncodeProfileRgbConversionInfoVALVE {
-    size: 24, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    perform_encode_rgb_conversion @ 16,
-});
-
-assert_abi_layout!(VideoEncodeSessionRgbConversionCreateInfoVALVE {
-    size: 32, align: 8,
-    s_type @ 0,
-    p_next @ 8,
-    rgb_model @ 16,
-    rgb_range @ 20,
-    x_chroma_offset @ 24,
-    y_chroma_offset @ 28,
-});
@@ -67,520 +67,12 @@ pub(super) fn resolve_subframe(default_on: bool) -> bool {
    }
 }

-/// Resolved NVENC split-frame encode mode for a session — ONE selector shared by the Windows and
-/// Linux direct-SDK backends (they had drifted into byte-identical duplicates, one of which
-/// logged and one didn't). Precedence:
-/// 1. `PUNKTFUNK_SPLIT_ENCODE` = `0`/`disable` | `1`/`auto` (AUTO_FORCED) | `2` | `3` — operator
-///    override, always wins.
-/// 2. 10-bit → DISABLE: 2-way split is measurably SLOWER on Ada for Main10 — at 5120×1440@240
-///    forced-2 took 7.6 ms/frame (~131 fps) vs 2.8 ms (~357 fps) single-engine (the split/merge
-///    overhead dominates), and a single engine handles 5K@240 Main10 well under budget. This was
-///    the "broken animations in HDR" cap at ~131 fps.
-/// 3. Pixel rate ≥ [`super::SPLIT_FORCE_PIXEL_RATE`] → force 2-way (AUTO never engages below
-///    ~2112 px height, so 4K120 must be forced onto the second engine).
-/// 4. Else AUTO (the ~2% BD-rate split cost isn't worth it at low pixel rates).
-///
-/// The caller still owns the rejection fallback (retry split-disabled) — a codec/config that
-/// rejects the chosen mode downgrades at open, not here.
-pub(super) fn resolve_split_mode(bit_depth: u8, pixel_rate: u64) -> u32 {
-    use nv::NV_ENC_SPLIT_ENCODE_MODE as M;
-    let mode = match std::env::var("PUNKTFUNK_SPLIT_ENCODE").ok().as_deref() {
-        Some("0") | Some("disable") => M::NV_ENC_SPLIT_DISABLE_MODE as u32,
-        Some("1") | Some("auto") => M::NV_ENC_SPLIT_AUTO_FORCED_MODE as u32,
-        Some("3") => M::NV_ENC_SPLIT_THREE_FORCED_MODE as u32,
-        Some("2") => M::NV_ENC_SPLIT_TWO_FORCED_MODE as u32,
-        _ if bit_depth >= 10 => M::NV_ENC_SPLIT_DISABLE_MODE as u32,
-        _ if pixel_rate >= super::SPLIT_FORCE_PIXEL_RATE => M::NV_ENC_SPLIT_TWO_FORCED_MODE as u32,
-        _ => M::NV_ENC_SPLIT_AUTO_MODE as u32,
-    };
-    tracing::debug!(
-        split_mode = mode,
-        bit_depth,
-        pixel_rate,
-        "NVENC split-encode mode selected"
-    );
-    mode
-}
-
-/// Whether the operator EXPLICITLY forced sub-frame readback on (`PUNKTFUNK_NVENC_SUBFRAME=1`)
-/// — the log-severity input to [`resolve_split_subframe`]: a forced knob being overridden
-/// deserves a `warn`, a default being tuned an `info`. Callers LATCH this once next to their
-/// resolved subframe state (an env re-read at reconfigure would violate the "open and
-/// reconfigure present identical init params" invariant).
-/// Linux-cfg'd like its ONLY caller (the `nvenc_cuda` query_caps latch) — Windows sessions have
-/// `subframe == forced` by construction (env opt-in only) and never consult this; without the
-/// cfg it is dead code on every Windows leg (item-level dead_code, the recurring trap).
-#[cfg(target_os = "linux")]
-pub(super) fn subframe_env_forced() -> bool {
-    matches!(
-        std::env::var("PUNKTFUNK_NVENC_SUBFRAME").as_deref(),
-        Ok("1")
-    )
-}
-
-/// The split-encode × sub-frame arbitration (Phase 8; verified against `nvEncodeAPI.h`'s own
-/// `splitEncodeMode` doc, not folklore):
-/// - **H.264**: split "is not applicable" — hard-DISABLE the mode so the written config, the
-///   ceiling-cache key, the split diagnostic log and the rejection-retry all stay truthful (the
-///   retry used to re-open a byte-identical session after an H.264 "split rejection").
-/// - **HEVC**: split is "not supported if … subframe mode" — when WE force split
-///   (TWO/THREE/AUTO_FORCED, e.g. the 4K120 throughput requirement), sub-frame yields. Under
-///   plain AUTO the driver arbitrates — the shipped fleet state (1080p–1440p240 all run
-///   AUTO+subframe); keying on `!= DISABLE` here would have disarmed the Phase-3 chunked-poll
-///   feature fleet-wide.
-/// - **AV1**: both legal (sub-frame is per-tile; split is constrained only by
-///   output-into-vidmem, which we never use) — untouched.
-///
-/// Returns the `(split_mode, subframe)` to ACTUALLY configure. The caller must store BOTH back
-/// (the chunked-poll latch and `CeilingKey` key on them) — a silent in-params drop would leave
-/// `poll_chunk` busy-polling its full budget every AU (`numSlices` stays 0 without
-/// `reportSliceOffsets`, so neither loop exit ever fires).
-pub(super) fn resolve_split_subframe(
-    codec: Codec,
-    split_mode: u32,
-    subframe: bool,
-    subframe_forced: bool,
-) -> (u32, bool) {
-    use nv::NV_ENC_SPLIT_ENCODE_MODE as M;
-    if codec == Codec::H264 {
-        return (M::NV_ENC_SPLIT_DISABLE_MODE as u32, subframe);
-    }
-    let split_forced = split_mode == M::NV_ENC_SPLIT_TWO_FORCED_MODE as u32
-        || split_mode == M::NV_ENC_SPLIT_THREE_FORCED_MODE as u32
-        || split_mode == M::NV_ENC_SPLIT_AUTO_FORCED_MODE as u32;
-    if codec == Codec::H265 && split_forced && subframe {
-        if subframe_forced {
-            tracing::warn!(
-                split_mode,
-                "HEVC forced split-encode and PUNKTFUNK_NVENC_SUBFRAME=1 are mutually \
-                 unsupported (nvEncodeAPI.h) — sub-frame readback disabled for this session; \
-                 set PUNKTFUNK_SPLIT_ENCODE=0 to choose sub-frame instead"
-            );
-        } else {
-            tracing::info!(
-                split_mode,
-                "HEVC forced split-encode supersedes default-on sub-frame readback (mutually \
-                 unsupported per nvEncodeAPI.h; split is the 4K120 throughput lever) — set \
-                 PUNKTFUNK_SPLIT_ENCODE=0 to choose sub-frame instead"
-            );
-        }
-        return (split_mode, false);
-    }
-    (split_mode, subframe)
-}
-
-#[cfg(test)]
-mod split_subframe_tests {
-    use super::{resolve_split_subframe, Codec};
-    use nvidia_video_codec_sdk::sys::nvEncodeAPI::NV_ENC_SPLIT_ENCODE_MODE as M;
-
-    const AUTO: u32 = M::NV_ENC_SPLIT_AUTO_MODE as u32;
-    const TWO: u32 = M::NV_ENC_SPLIT_TWO_FORCED_MODE as u32;
-    const AUTO_F: u32 = M::NV_ENC_SPLIT_AUTO_FORCED_MODE as u32;
-    const DISABLE: u32 = M::NV_ENC_SPLIT_DISABLE_MODE as u32;
-
-    /// THE FLEET CASE: plain AUTO + default-on sub-frame must pass through untouched — the
-    /// driver arbitrates. Keying the rule on `!= DISABLE` would disarm sub-frame on every
-    /// default Linux HEVC session (AUTO == 0 is the resolver's fallthrough).
-    #[test]
-    fn hevc_auto_keeps_subframe() {
-        assert_eq!(
-            resolve_split_subframe(Codec::H265, AUTO, true, false),
-            (AUTO, true)
-        );
-    }
-
-    #[test]
-    fn hevc_forced_split_drops_subframe() {
-        assert_eq!(
-            resolve_split_subframe(Codec::H265, TWO, true, false),
-            (TWO, false)
-        );
-        assert_eq!(
-            resolve_split_subframe(Codec::H265, AUTO_F, true, true),
-            (AUTO_F, false)
-        );
-        // No sub-frame to drop → nothing changes.
-        assert_eq!(
-            resolve_split_subframe(Codec::H265, TWO, false, false),
-            (TWO, false)
-        );
-        // Explicitly disabled split → sub-frame kept (the documented escape).
-        assert_eq!(
-            resolve_split_subframe(Codec::H265, DISABLE, true, true),
-            (DISABLE, true)
-        );
-    }
-
-    /// H.264: split "is not applicable" (nvEncodeAPI.h) — hard-DISABLE regardless of the
-    /// resolved mode; sub-frame (H.264 slices) is unaffected.
-    #[test]
-    fn h264_split_hard_disabled() {
-        assert_eq!(
-            resolve_split_subframe(Codec::H264, TWO, true, false),
-            (DISABLE, true)
-        );
-        assert_eq!(
-            resolve_split_subframe(Codec::H264, AUTO, false, false),
-            (DISABLE, false)
-        );
-    }
-
-    /// AV1: both features are legal together (per-tile sub-frame; split constrained only by
-    /// output-into-vidmem) — the arbitration must not touch it.
-    #[test]
-    fn av1_untouched() {
-        assert_eq!(
-            resolve_split_subframe(Codec::Av1, TWO, true, true),
-            (TWO, true)
-        );
-    }
-}
-
-/// One session config's identity for the process-lifetime bitrate-ceiling cache
-/// ([`cached_ceiling`]/[`store_ceiling`]). Everything the driver's codec-level validation keys
-/// off: the GPU (different NVENC generations have different level ceilings), dims/fps (the luma
-/// rate selects the level), depth/chroma (they select the profile) and the split mode the
-/// sessions ACTUALLY opened with (a split session budgets per engine).
-#[derive(Clone, Copy, PartialEq, Eq, Hash)]
-pub(super) struct CeilingKey {
-    /// GPU identity — Linux: the process-global shared `CUcontext` pointer; Windows: the render
-    /// adapter LUID (0 when unresolved). Best effort: the cache is advisory (see
-    /// [`cached_ceiling`]), so a colliding identity costs one failed open + re-search, never a
-    /// wrong session.
-    pub gpu: u64,
-    pub codec: Codec,
-    pub width: u32,
-    pub height: u32,
-    pub fps: u32,
-    pub bit_depth: u8,
-    pub chroma_444: bool,
-    pub split_mode: u32,
-}
-
-fn ceilings() -> &'static std::sync::Mutex<std::collections::HashMap<CeilingKey, u64>> {
-    static CEILINGS: std::sync::OnceLock<
-        std::sync::Mutex<std::collections::HashMap<CeilingKey, u64>>,
-    > = std::sync::OnceLock::new();
-    CEILINGS.get_or_init(Default::default)
-}
-
-/// The codec-level bitrate ceiling (bps) a previous clamp search discovered for `key` this
-/// process lifetime, if any. ADVISORY: the consumer must treat a failed open at the cached value
-/// as a stale entry (fall back to the full search, which rewrites it via [`store_ceiling`]) —
-/// that self-healing is what lets the key's GPU identity be best-effort. What this buys: an ABR
-/// overshoot on a config whose ceiling is already known opens (or in-place reconfigures) straight
-/// AT the ceiling instead of re-running the ~6-open binary search and its ~half-second of session
-/// churn per rebuild.
-pub(super) fn cached_ceiling(key: &CeilingKey) -> Option<u64> {
-    ceilings().lock().unwrap().get(key).copied()
-}
-
-/// Record the clamp search's discovered max accepted bitrate (bps) for `key`.
-pub(super) fn store_ceiling(key: CeilingKey, bps: u64) {
-    ceilings().lock().unwrap().insert(key, bps);
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use nv::NV_ENC_SPLIT_ENCODE_MODE as M;
-
-    // These assume PUNKTFUNK_SPLIT_ENCODE is unset (CI); an operator override deliberately wins.
-
-    /// `encodeCodecConfig` is a C union, so the HEVC 4:4:4 arm must be codec-gated or it stamps
-    /// `hevcConfig` bytes onto another codec's config. Before the gate this branch was reached on
-    /// ANY codec with `chroma_444 && full_chroma_input` and stayed non-UB only because `lib.rs`
-    /// degrades 4:4:4 for non-HEVC — a two-file invariant with nothing asserting it.
-    ///
-    /// It also had to stop swallowing the per-codec bit-depth arm: this is an `if`/`else if`, so a
-    /// non-HEVC 4:4:4 session used to take the HEVC branch and get NEITHER 4:4:4 nor its own 10-bit
-    /// setup. AV1 asserts the depth it actually needs.
-    fn low_latency_cfg(codec: Codec, chroma_444: bool, bit_depth: u8) -> LowLatencyConfig {
-        LowLatencyConfig {
-            codec,
-            bitrate: 20_000_000,
-            fps: 60,
-            custom_vbv: false,
-            chroma_444,
-            full_chroma_input: true,
-            bit_depth,
-            av1_input_depth_minus8: 0,
-            hdr: false,
-            rfi_supported: false,
-            slices: 0,
-        }
-    }
-
-    #[test]
-    fn hevc_444_still_takes_the_frext_path() {
-        // `NV_ENC_CONFIG` must NOT be `mem::zeroed` — `frameFieldMode`/`mvPrecision` are C enums
-        // whose discriminants start at 1, so all-zero is not a valid value and Rust's own
-        // zero-init check aborts the process. Production seeds it the same way, from `Default`
-        // (then overwrites from the driver's preset).
-        // SAFETY: `apply_low_latency_config` only writes into the caller's config (union writes
-        // included) and makes no driver calls, so this is pure in-memory work.
-        let cfg = unsafe {
-            let mut cfg = nv::NV_ENC_CONFIG {
-                version: nv::NV_ENC_CONFIG_VER,
-                ..Default::default()
-            };
-            apply_low_latency_config(&mut cfg, low_latency_cfg(Codec::H265, true, 10));
-            cfg
-        };
-        assert_eq!(cfg.profileGUID, nv::NV_ENC_HEVC_PROFILE_FREXT_GUID);
-        // SAFETY: an HEVC session's union arm is `hevcConfig` — the one this path wrote.
-        unsafe {
-            assert_eq!(cfg.encodeCodecConfig.hevcConfig.chromaFormatIDC(), 3);
-            assert_eq!(cfg.encodeCodecConfig.hevcConfig.pixelBitDepthMinus8(), 2);
-        }
-    }
-
-    #[test]
-    fn av1_never_takes_the_hevc_444_union_write() {
-        // SAFETY: as above — pure in-memory config authoring, no driver involvement.
-        let cfg = unsafe {
-            let mut cfg = nv::NV_ENC_CONFIG {
-                version: nv::NV_ENC_CONFIG_VER,
-                ..Default::default()
-            };
-            apply_low_latency_config(&mut cfg, low_latency_cfg(Codec::Av1, true, 10));
-            cfg
-        };
-        // The HEVC FREXT profile GUID on an AV1 session is an INVALID_PARAM at open.
-        assert_ne!(
-            cfg.profileGUID,
-            nv::NV_ENC_HEVC_PROFILE_FREXT_GUID,
-            "4:4:4 on AV1 must not stamp the HEVC FREXT profile"
-        );
-        // ...and the AV1 arm must still have run, which the old if/else-if skipped entirely.
-        // SAFETY: an AV1 session's union arm is `av1Config`.
-        unsafe {
-            assert_eq!(
-                cfg.encodeCodecConfig.av1Config.pixelBitDepthMinus8(),
-                2,
-                "AV1 10-bit setup was swallowed by the HEVC 4:4:4 branch"
-            );
-        }
-    }
-
-    #[test]
-    fn split_forces_two_way_at_4k120() {
-        // The regression this threshold constant exists for: 3840×2160×120 = 995,328,000 sat
-        // 0.47% under the old `> 1_000_000_000` gate and stayed AUTO — pinned ~107 fps on a
-        // 4090 because AUTO never engages at 2160 px height.
-        let four_k_120 = 3840u64 * 2160 * 120;
-        assert_eq!(
-            resolve_split_mode(8, four_k_120),
-            M::NV_ENC_SPLIT_TWO_FORCED_MODE as u32
-        );
-    }
-
-    #[test]
-    fn split_leaves_1440p240_auto() {
-        // 884.7 Mpix/s is comfortably single-engine — the threshold move must not drag it in.
-        let qhd_240 = 2560u64 * 1440 * 240;
-        assert_eq!(
-            resolve_split_mode(8, qhd_240),
-            M::NV_ENC_SPLIT_AUTO_MODE as u32
-        );
-    }
-
-    #[test]
-    fn split_disabled_for_10bit_even_at_high_pixel_rate() {
-        // The measured Main10 rule: split/merge overhead dominates 10-bit on Ada (7.6 ms forced-2
-        // vs 2.8 ms single-engine at 5K240) — 10-bit precedes the pixel-rate arm.
-        let five_k_240 = 5120u64 * 1440 * 240;
-        assert_eq!(
-            resolve_split_mode(10, five_k_240),
-            M::NV_ENC_SPLIT_DISABLE_MODE as u32
-        );
-    }
-
-    #[test]
-    fn ceiling_cache_round_trips_and_keys_precisely() {
-        let key = CeilingKey {
-            gpu: 0xB0B0,
-            codec: Codec::H265,
-            width: 3840,
-            height: 2160,
-            fps: 120,
-            bit_depth: 8,
-            chroma_444: false,
-            split_mode: M::NV_ENC_SPLIT_TWO_FORCED_MODE as u32,
-        };
-        assert_eq!(cached_ceiling(&key), None);
-        store_ceiling(key, 794_000_000);
-        assert_eq!(cached_ceiling(&key), Some(794_000_000));
-        // Any config-identity change is a different ceiling — a miss, never a wrong clamp.
-        assert_eq!(cached_ceiling(&CeilingKey { fps: 60, ..key }), None);
-        assert_eq!(
-            cached_ceiling(&CeilingKey {
-                split_mode: M::NV_ENC_SPLIT_DISABLE_MODE as u32,
-                ..key
-            }),
-            None
-        );
-        // A re-search overwrites (the advisory-cache stale-entry path).
-        store_ceiling(key, 620_000_000);
-        assert_eq!(cached_ceiling(&key), Some(620_000_000));
-    }
-}
-
 /// Reference-frame DPB depth when RFI is supported (Apollo uses 5). A deeper DPB lets an invalidated
 /// reference fall back to an older still-valid frame instead of a full IDR; `numRefL0 = 1` keeps each
-/// P-frame single-reference for low latency. Also the window [`plan_range_recovery`] checks against
-/// (`next_ts - RFI_DPB` = the oldest frame still in the DPB).
+/// P-frame single-reference for low latency. Also the window the backends' `invalidate_ref_frames`
+/// paths check against (`frame_idx - RFI_DPB` = the oldest frame still in the DPB).
 pub(super) const RFI_DPB: u32 = 5;

-/// One loss event's recovery decision for the timestamp-range RFI both direct-NVENC backends run
-/// (the range half of WP7.2's policy extraction; the slot half — AMF/QSV/Vulkan — is
-/// `crate::rfi`). The mechanism (the per-timestamp `nvEncInvalidateRefFrames` loop, the
-/// `last_rfi_range`/`pending_anchor` stores, the null-handle/`rfi_supported` gate) stays in each
-/// backend.
-pub(super) enum RangePlan {
-    /// The last successful invalidation already covers this range — no new driver calls, no IDR.
-    /// The caller must still RE-ARM its recovery anchor: the client re-asking means the previous
-    /// anchor AU may itself have been lost, and the next frame is just as clean a re-anchor.
-    Covered,
-    /// Invalidate `first..=last` (the CLAMPED range — this is also what the caller must record in
-    /// `last_rfi_range` on success, exactly as the inline code stored the post-clamp values).
-    Invalidate { first: i64, last: i64 },
-    /// Recovery without an IDR is impossible (nonsense range, loss older than the DPB, or a range
-    /// entirely in the future) — the caller returns `false` and its (coalesced) keyframe path
-    /// recovers. Deliberately NOT paired with any state clearing: neither twin touches
-    /// `pending_anchor` on decline (matching Vulkan's decline, opposite of AMF/QSV's
-    /// `pending_force` clear — see `crate::rfi`'s module doc before "harmonizing").
-    Decline,
-}
-
-/// The range-RFI policy, extracted verbatim from the two backends' `invalidate_ref_frames` (they
-/// were hand-copied twins). Step order is load-bearing and pinned by tests:
-///
-/// 1. nonsense range (`first < 0 || first > last`) → [`RangePlan::Decline`];
-/// 2. covering-range dedup — checked with the UNCLAMPED `last`, BEFORE the DPB window, so a
-///    covered re-ask never touches the driver even when the range has since left the DPB;
-/// 3. DPB window: `first < next_ts - RFI_DPB` → Decline (a lost frame older than the DPB cannot
-///    be invalidated; the only correct recovery is an IDR);
-/// 4. clamp `last` to `next_ts - 1` (never invalidate a timestamp never assigned); an inverted
-///    range after the clamp (loss entirely in the future — a prediction desync) → Decline.
-///
-/// `next_ts` is the backend's `frame_idx`: the NEXT timestamp to assign, which `submit_indexed`
-/// pins to the wire frame index — so the client's lost-frame range maps 1:1 onto the timestamps
-/// the driver invalidates, across every rebuild/reset. Note `teardown()` clears `last_rfi_range`
-/// but NOT `frame_idx`, so a post-reset call legitimately sees a stale-high `next_ts` with a
-/// `None` range — the same view the inline code had.
-pub(super) fn plan_range_recovery(
-    first: i64,
-    last: i64,
-    next_ts: i64,
-    last_rfi_range: Option<(i64, i64)>,
-) -> RangePlan {
-    if first < 0 || first > last {
-        return RangePlan::Decline;
-    }
-    if let Some((pf, pl)) = last_rfi_range {
-        if first >= pf && last <= pl {
-            return RangePlan::Covered;
-        }
-    }
-    let oldest_in_dpb = next_ts - RFI_DPB as i64;
-    if first < oldest_in_dpb {
-        return RangePlan::Decline;
-    }
-    let last = last.min(next_ts - 1);
-    if first > last {
-        return RangePlan::Decline;
-    }
-    RangePlan::Invalidate { first, last }
-}
-
-#[cfg(test)]
-mod range_policy_tests {
-    use super::{plan_range_recovery, RangePlan, RFI_DPB};
-
-    /// Convenience: the plan with no prior invalidation recorded.
-    fn plan(first: i64, last: i64, next_ts: i64) -> RangePlan {
-        plan_range_recovery(first, last, next_ts, None)
-    }
-
-    #[test]
-    fn nonsense_ranges_decline() {
-        assert!(matches!(plan(-1, 5, 100), RangePlan::Decline));
-        assert!(matches!(plan(7, 5, 100), RangePlan::Decline));
-    }
-
-    #[test]
-    fn covering_range_dedups_partial_overlap_does_not() {
-        let prior = Some((90i64, 95i64));
-        // Exact cover and sub-range → Covered. This pins EXISTING behavior, including that a
-        // covered range survives a forced IDR with zero driver calls (nothing clears
-        // `last_rfi_range` on a keyframe) — a recorded fact, not an endorsement.
-        assert!(matches!(
-            plan_range_recovery(90, 95, 100, prior),
-            RangePlan::Covered
-        ));
-        assert!(matches!(
-            plan_range_recovery(92, 94, 100, prior),
-            RangePlan::Covered
-        ));
-        // Partial overlap re-invalidates the FULL new range (next_ts = 98 keeps the window open:
-        // oldest_in_dpb = 93; at next_ts = 100 the same range would age out and Decline instead).
-        assert!(matches!(
-            plan_range_recovery(93, 97, 98, prior),
-            RangePlan::Invalidate {
-                first: 93,
-                last: 97
-            }
-        ));
-    }
-
-    /// The covering check runs BEFORE the DPB window: a covered re-ask stays Covered (no driver
-    /// calls needed) even when the range has since aged out of the DPB.
-    #[test]
-    fn covered_is_checked_before_the_dpb_window() {
-        let prior = Some((10i64, 12i64));
-        assert!(matches!(
-            plan_range_recovery(10, 12, 100, prior),
-            RangePlan::Covered
-        ));
-        // ...whereas the same range with no prior invalidation is outside the window → Decline.
-        assert!(matches!(plan(10, 12, 100), RangePlan::Decline));
-    }
-
-    #[test]
-    fn dpb_window_boundary() {
-        let next_ts = 100i64;
-        let oldest = next_ts - RFI_DPB as i64; // 95: the oldest timestamp still in the DPB
-        assert!(matches!(
-            plan(oldest, oldest, next_ts),
-            RangePlan::Invalidate { .. }
-        ));
-        assert!(matches!(
-            plan(oldest - 1, oldest, next_ts),
-            RangePlan::Decline
-        ));
-    }
-
-    /// `last` clamps to `next_ts - 1` (the newest encoded frame); the Invalidate carries the
-    /// CLAMPED value — which is also what the caller records in `last_rfi_range`.
-    #[test]
-    fn clamps_to_newest_encoded() {
-        assert!(matches!(
-            plan(98, 150, 100),
-            RangePlan::Invalidate {
-                first: 98,
-                last: 99
-            }
-        ));
-        // A range entirely in the future inverts under the clamp → Decline (prediction desync).
-        assert!(matches!(plan(100, 150, 100), RangePlan::Decline));
-        // Fresh session (`frame_idx == 0`): window passes (oldest = -5) but the clamp gives
-        // last = -1 < first → Decline. The inline code behaved identically.
-        assert!(matches!(plan(0, 3, 0), RangePlan::Decline));
-    }
-}
-
 /// The per-session knobs both direct-NVENC backends feed [`apply_low_latency_config`]. `Copy` so the
 /// backend fills it from `self` at the call. The two input-format fields bridge the only real
 /// divergence between the CUDA and D3D11 paths (which surface formats can carry full chroma / 10-bit
@@ -727,27 +219,7 @@ pub(super) unsafe fn apply_low_latency_config(cfg: &mut nv::NV_ENC_CONFIG, c: Lo
    // profile) takes precedence and composes with 10-bit (Main 4:4:4 10); it needs a full-chroma-
    // capable input. Otherwise 10-bit selects Main10 (HEVC) or the AV1 output depth — stamping the
    // HEVC Main10 GUID onto an AV1 session is an INVALID_PARAM, so bit depth is set PER CODEC.
-    // `encodeCodecConfig` is a C UNION, so the `hevcConfig` writes below are only meaningful on an
-    // HEVC session — on an H.264 or AV1 one they reinterpret that codec's own config bytes. The
-    // codec test is therefore load-bearing, not defensive: without it this branch was gated purely
-    // on `chroma_444 && full_chroma_input` and stayed non-UB only because `lib.rs` degrades 4:4:4
-    // for non-HEVC codecs. That was a two-file invariant with nothing asserting it, on the path
-    // BOTH direct-NVENC backends take.
-    //
-    // Being a codec test also fixes a second, quieter bug in the same shape: this is an
-    // `if`/`else if`, so a non-HEVC session that somehow arrived with `chroma_444` set took this
-    // branch and skipped the per-codec bit-depth arm entirely — ending up with neither HEVC 4:4:4
-    // (wrong for it) nor its own 10-bit configuration (simply missing). Non-HEVC now falls through
-    // to the arm that knows what to do with it.
-    let want_444 = c.chroma_444 && c.full_chroma_input;
-    if want_444 && c.codec != Codec::H265 {
-        tracing::warn!(
-            codec = ?c.codec,
-            "4:4:4 requested on a non-HEVC NVENC session — ignoring it (Range Extensions are \
-             HEVC-only); the negotiator should have degraded this to 4:2:0 before the open"
-        );
-    }
-    if want_444 && c.codec == Codec::H265 {
+    if c.chroma_444 && c.full_chroma_input {
        cfg.profileGUID = nv::NV_ENC_HEVC_PROFILE_FREXT_GUID;
        cfg.encodeCodecConfig.hevcConfig.set_chromaFormatIDC(3);
        if c.bit_depth == 10 {
@@ -8,77 +8,27 @@
 //! means and what the operator should do, and folds that cause into the `anyhow::Error` at
 //! construction, so every downstream `{e:#}` log (the encode-recovery loop, session teardown) says
 //! the useful thing without extra plumbing.
-//!
-//! One status needs process state to explain honestly: the driver reports BOTH "your headers are
-//! newer than my kernel module" and "I can no longer hand this process a session" as
-//! `NV_ENC_ERR_INVALID_VERSION`. [`note_session_opened`] latches the fact that a session already
-//! opened here, which tells the two apart — see [`explain`].
-
-use std::sync::atomic::{AtomicBool, Ordering};

 use nvidia_video_codec_sdk::sys::nvEncodeAPI as nv;

-/// Latched the first time `nvEncOpenEncodeSessionEx` succeeds in this process (the caps probe, a
-/// real session open, or the Windows availability probe — every one of them completes the
-/// userspace↔kernel-module handshake).
-///
-/// The load-time gate (`NvEncodeAPIGetMaxSupportedVersion`, both backends' `load_api`) can NOT
-/// serve this purpose: it is a pure userspace query, so the genuine "updated the driver, didn't
-/// reboot" skew sails through it and fails later, at the open. Only a session that actually opened
-/// proves the kernel module agreed.
-static SESSION_OPENED: AtomicBool = AtomicBool::new(false);
-
-/// Record that an NVENC session opened. Call right after every successful
-/// `open_encode_session_ex`, so [`explain`] can rule a version skew out for the rest of the
-/// process.
-pub(super) fn note_session_opened() {
-    SESSION_OPENED.store(true, Ordering::Relaxed);
-}
-
-/// The two very different failures the driver reports as `NV_ENC_ERR_INVALID_VERSION`, split on
-/// whether a session has already opened here (`session_opened`). Pure, so both halves are testable
-/// without touching the process-wide latch.
-fn invalid_version(session_opened: bool) -> String {
-    if session_opened {
-        // Same status, opposite cause: a session ALREADY opened in this process, so the driver's
-        // kernel module accepted this exact build's version word minutes ago. A version skew is
-        // static — it cannot come and go — so "update the driver / reboot" is the wrong advice
-        // here, and following it costs the operator a reboot per stream (2026-07 field report: one
-        // stream works, the next fails at the caps probe, forever, until the PROCESS restarts).
-        // What is left is per-process driver state: a resource the last session did not give back,
-        // or a wedged/lost device. Say that, and point at the cheap fix.
-        // Worded for ANY call (`explain` also serves `lock_bitstream`); `call_err` already names
-        // the entry point ahead of this text, so it must not assume the session open.
-        return "this process already opened an NVENC session successfully, so this is NOT a driver \
-                version mismatch — that cannot come and go within a process, and a reboot is not \
-                the fix. The NVIDIA driver state in THIS process is exhausted or wedged: restart \
-                the Punktfunk host service to clear it, and please report this with the host log \
-                so it can be fixed properly"
-            .to_string();
-    }
-    // No session has ever opened here, so the version word really is in question. Either the
-    // driver is genuinely older than our headers, or (the sneaky case) the userspace
-    // `libnvidia-encode` reports a new-enough version to the pre-flight probe but the running
-    // kernel module is older and rejects the session — the classic "updated the driver, didn't
-    // reboot" skew. Both heal the same way.
-    format!(
-        "the NVIDIA driver is older than this build's NVENC headers (needs NVENC API {}.{} or \
-         newer), or the userspace and kernel-module driver versions are mismatched — common right \
-         after a driver update without a reboot. Update the NVIDIA driver, or reboot if you just \
-         updated it (a host restart is the usual fix).",
-        nv::NVENCAPI_MAJOR_VERSION,
-        nv::NVENCAPI_MINOR_VERSION,
-    )
-}
-
 /// A one-line, operator-actionable cause for an NVENC status. Does not repeat the raw code —
 /// callers print that alongside (see [`call_err`]). Public for the few sites that build a
 /// `String`/`format!` error instead of an `anyhow::Error`.
 pub(super) fn explain(status: nv::NVENCSTATUS) -> String {
    match status {
-        nv::NVENCSTATUS::NV_ENC_ERR_INVALID_VERSION => {
-            invalid_version(SESSION_OPENED.load(Ordering::Relaxed))
-        }
+        // The one this whole module exists for: a version word the driver rejects. Either the
+        // driver is genuinely older than our headers, or (the sneaky case) the userspace
+        // `libnvidia-encode` reports a new-enough version to the pre-flight probe but the running
+        // kernel module is older and rejects the session — the classic "updated the driver, didn't
+        // reboot" skew. Both heal the same way.
+        nv::NVENCSTATUS::NV_ENC_ERR_INVALID_VERSION => format!(
+            "the NVIDIA driver is older than this build's NVENC headers (needs NVENC API {}.{} or \
+             newer), or the userspace and kernel-module driver versions are mismatched — common \
+             right after a driver update without a reboot. Update the NVIDIA driver, or reboot if \
+             you just updated it (a host restart is the usual fix).",
+            nv::NVENCAPI_MAJOR_VERSION,
+            nv::NVENCAPI_MINOR_VERSION,
+        ),
        nv::NVENCSTATUS::NV_ENC_ERR_NO_ENCODE_DEVICE => {
            "this GPU exposes no usable NVENC engine — it has no hardware video encoder, or NVENC is \
             disabled on this card"
@@ -122,144 +72,9 @@ pub(super) fn explain(status: nv::NVENCSTATUS) -> String {
    }
 }

-/// Typed root of a failed NVENC entry-point call: carries the raw status so callers can classify
-/// the failure class, not just print it — the bitrate-clamp search must only read a
-/// parameter/caps rejection as "above the codec-level ceiling"; a transient failure shrinking the
-/// search would discover (and cache) a bogus ceiling. Recover it through an `anyhow` chain with
-/// `err.downcast_ref::<NvCallError>()` (see [`is_param_rejection`]).
-#[derive(Debug)]
-pub(super) struct NvCallError(pub(super) nv::NVENCSTATUS);
-
-impl std::fmt::Display for NvCallError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{:?} — {}", self.0, explain(self.0))
-    }
-}
-
-impl std::error::Error for NvCallError {}
-
-/// Whether `err` is an NVENC parameter/capability rejection: the driver understood the request
-/// and says THIS config is not encodable — the clamp search's "bitrate above the ceiling"
-/// evidence. Everything else (busy engine, session limit, OOM, device loss, version skew) is
-/// environmental and must propagate instead of steering the search.
-pub(super) fn is_param_rejection(err: &anyhow::Error) -> bool {
-    matches!(
-        err.downcast_ref::<NvCallError>(),
-        Some(NvCallError(
-            nv::NVENCSTATUS::NV_ENC_ERR_INVALID_PARAM
-                | nv::NVENCSTATUS::NV_ENC_ERR_UNSUPPORTED_PARAM
-                | nv::NVENCSTATUS::NV_ENC_ERR_UNIMPLEMENTED,
-        ))
-    )
-}
-
 /// Build an actionable `anyhow::Error` for a failed NVENC entry-point call. `call` names the API
-/// (e.g. `"open_encode_session_ex"`); the chain carries both the raw status and its real-world
-/// cause, so triage never again reads a version mismatch as "(no NVIDIA GPU?)". The
-/// [`NvCallError`] root keeps the status downcastable for failure-class checks.
+/// (e.g. `"open_encode_session_ex"`); the message carries both the raw status and its real-world
+/// cause, so triage never again reads a version mismatch as "(no NVIDIA GPU?)".
 pub(super) fn call_err(call: &str, status: nv::NVENCSTATUS) -> anyhow::Error {
-    anyhow::Error::new(NvCallError(status)).context(format!("NVENC {call} failed"))
-}
-
-/// Whether a FAILED `nvEncDestroyEncoder` status PROVES the driver holds no session for the
-/// handle — i.e. the per-process concurrent-session slot is not consumed, so the session's budget
-/// units can be refunded immediately. These are the statuses the driver returns when the session
-/// or its device no longer exists on its side (a TDR/device removal reclaims every session with
-/// the context). Everything else — `GENERIC`, `ENCODER_BUSY`, OOM, ... — is AMBIGUOUS: the slot
-/// may genuinely still be held, so the caller must park the handle fail-closed (units stay
-/// charged) and let a later retry-destroy produce the proof. Splitting on proof is what keeps the
-/// session budget from drifting low on failures (over-admitting parallel displays) WITHOUT letting
-/// one transient wedge episode permanently poison admission until a host restart.
-///
-/// Used by the Windows D3D11 backend's teardown accounting; the Linux CUDA backend has no session
-/// budget (parallel-display admission is a Windows feature), so there this exists for the unit
-/// tests only.
-#[cfg_attr(not(target_os = "windows"), allow(dead_code))]
-pub(super) fn destroy_proves_no_session(status: nv::NVENCSTATUS) -> bool {
-    matches!(
-        status,
-        nv::NVENCSTATUS::NV_ENC_ERR_DEVICE_NOT_EXIST
-            | nv::NVENCSTATUS::NV_ENC_ERR_INVALID_ENCODERDEVICE
-            | nv::NVENCSTATUS::NV_ENC_ERR_INVALID_PTR
-            | nv::NVENCSTATUS::NV_ENC_ERR_ENCODER_NOT_INITIALIZED
-    )
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// Before any session has opened, the version word IS in question — keep the skew advice.
-    #[test]
-    fn invalid_version_before_any_session_blames_the_driver_version() {
-        let msg = invalid_version(false);
-        assert!(
-            msg.contains("older than this build's NVENC headers"),
-            "{msg}"
-        );
-        assert!(msg.contains("reboot if you just updated it"), "{msg}");
-    }
-
-    /// Once a session has opened here, a skew is impossible — the message must stop sending
-    /// operators to reboot (2026-07 field report: one stream per boot, forever).
-    #[test]
-    fn invalid_version_after_a_session_blames_process_state_not_the_driver() {
-        let msg = invalid_version(true);
-        assert!(msg.contains("NOT a driver version mismatch"), "{msg}");
-        assert!(msg.contains("restart the Punktfunk host service"), "{msg}");
-        assert!(
-            !msg.contains("older than this build's NVENC headers"),
-            "must not repeat the version-skew advice: {msg}"
-        );
-        assert!(
-            !msg.contains("Update the NVIDIA driver"),
-            "must not tell the operator to update a driver that just worked: {msg}"
-        );
-    }
-
-    /// The latch is one-way and only touches this status.
-    #[test]
-    fn note_session_opened_latches() {
-        note_session_opened();
-        assert!(SESSION_OPENED.load(Ordering::Relaxed));
-        note_session_opened();
-        assert!(SESSION_OPENED.load(Ordering::Relaxed));
-        assert_eq!(
-            explain(nv::NVENCSTATUS::NV_ENC_ERR_OUT_OF_MEMORY),
-            "the GPU is out of memory"
-        );
-    }
-
-    /// Destroy-failure classification: session-gone statuses refund; everything ambiguous parks.
-    /// The split is the load-bearing part of the session-budget accounting — a wrong `true`
-    /// under-counts (over-admits parallel displays), a wrong `false` merely defers the refund to
-    /// a reap retry.
-    #[test]
-    fn destroy_classification_refunds_only_on_proof() {
-        for gone in [
-            nv::NVENCSTATUS::NV_ENC_ERR_DEVICE_NOT_EXIST,
-            nv::NVENCSTATUS::NV_ENC_ERR_INVALID_ENCODERDEVICE,
-            nv::NVENCSTATUS::NV_ENC_ERR_INVALID_PTR,
-            nv::NVENCSTATUS::NV_ENC_ERR_ENCODER_NOT_INITIALIZED,
-        ] {
-            assert!(
-                destroy_proves_no_session(gone),
-                "{gone:?} proves no session"
-            );
-        }
-        for ambiguous in [
-            nv::NVENCSTATUS::NV_ENC_ERR_GENERIC,
-            nv::NVENCSTATUS::NV_ENC_ERR_ENCODER_BUSY,
-            nv::NVENCSTATUS::NV_ENC_ERR_OUT_OF_MEMORY,
-            nv::NVENCSTATUS::NV_ENC_ERR_INVALID_PARAM,
-            // INVALID_DEVICE sounds like the gone class but is also what a transiently-confused
-            // driver returns — deliberately fail-closed (park + retry), not refunded.
-            nv::NVENCSTATUS::NV_ENC_ERR_INVALID_DEVICE,
-        ] {
-            assert!(
-                !destroy_proves_no_session(ambiguous),
-                "{ambiguous:?} must park fail-closed"
-            );
-        }
-    }
+    anyhow::anyhow!("NVENC {call} failed: {status:?} — {}", explain(status))
 }
@@ -81,61 +81,6 @@ pub(crate) fn block_count_32x32(width: u32, height: u32, chroma444: bool) -> u32
    count
 }

-/// Wire-aware deflation of the per-frame rate budget for the datagram-aligned mode.
-///
-/// [`build_au`]'s windowing inflates the codec bitstream on its way to the wire: greedy packing
-/// of pyrowave's few-hundred-byte atomic block packets into `chunk`-sized windows leaves the
-/// tail of most windows zero-padded, plus the 4-byte prefixes and FRAG-chain tails. At
-/// 1440p/~850 KiB frames that is ×1.2–1.3 — the 2026-07 field report's "Automatic" 407 Mb/s
-/// pin put 550 Mb/s on a 1 GbE link. The pin is a promise about the LINK, so the codec budget
-/// must absorb the framing: this tracker measures the real AU/bitstream ratio per frame and
-/// deflates the budget handed to pyrowave's rate control by its EMA. Sealed-datagram framing
-/// (packet header + AEAD tag) and FEC parity are deliberately NOT compensated — H.26x sessions
-/// carry those on top of the configured bitrate too, and the pin must mean the same thing for
-/// every codec.
-pub(crate) struct WireBudget {
-    /// EMA of `built AU bytes / packetized bitstream bytes`, ×1024 fixed point.
-    scale_x1024: u32,
-}
-
-impl WireBudget {
-    /// Startup prior (×1024 ≈ 1.25 — the 1440p field measurement's midpoint); the EMA
-    /// converges onto the session's real ratio within ~a second of frames.
-    const PRIOR_X1024: u32 = 1280;
-    /// EMA weight 1/8: content-driven per-frame wobble smooths out; a mode/bitrate change
-    /// re-converges in ~16 frames.
-    const EMA_SHIFT: u32 = 3;
-    /// Sanity clamp on the applied scale: never inflate the budget (×1.0 floor), never
-    /// deflate below half (×2.0 cap — tiny explicit bitrates window very coarsely).
-    const MIN_X1024: u32 = 1024;
-    const MAX_X1024: u32 = 2048;
-
-    pub(crate) fn new() -> WireBudget {
-        WireBudget {
-            scale_x1024: Self::PRIOR_X1024,
-        }
-    }
-
-    /// Record one frame's measured inflation (`bitstream_len` = the packetized codec bytes the
-    /// rate controller budgeted; `au_len` = the windowed AU that actually reaches the wire).
-    pub(crate) fn observe(&mut self, bitstream_len: usize, au_len: usize) {
-        if bitstream_len == 0 {
-            return;
-        }
-        let sample = ((au_len as u64 * 1024) / bitstream_len as u64)
-            .clamp(Self::MIN_X1024 as u64, Self::MAX_X1024 as u64) as u32;
-        let ema = self.scale_x1024 as i64;
-        self.scale_x1024 = (ema + ((sample as i64 - ema) >> Self::EMA_SHIFT)) as u32;
-    }
-
-    /// The rate-control budget that makes the WIRE hit `budget` bytes/frame under the
-    /// currently-measured inflation.
-    pub(crate) fn deflate(&self, budget: usize) -> usize {
-        let scale = self.scale_x1024.clamp(Self::MIN_X1024, Self::MAX_X1024) as u64;
-        ((budget as u64 * 1024) / scale) as usize
-    }
-}
-
 /// Frame pyrowave's `packets` (each an `(offset, size)` into `bitstream`) into the wire AU.
 /// `wire_chunk = None` copies the single dense packet; `Some(chunk)` produces the windowed
 /// datagram-aligned AU (a whole number of `chunk`-sized windows).
@@ -301,48 +246,6 @@ mod tests {
        assert!(block_count_32x32(3840, 2160, true) <= u16::MAX as u32);
        assert!(block_count_32x32(7680, 4320, true) > u16::MAX as u32);
        assert!(block_count_32x32(7680, 4320, false) <= u16::MAX as u32);
-        // …and 4:2:0 wraps it too, just later — the hole the old 4:4:4-only open guard left.
-        // `Codec::max_dimension()` allows PyroWave 8192px per axis, so these modes were
-        // reachable from a client-requested `mode=WxHxFPS`, and the negotiator's 4:4:4 → 4:2:0
-        // downgrade routed oversized modes straight into the unguarded branch.
-        // `validate_dimensions` now rejects them against this 4:2:0 count.
-        assert_eq!(block_count_32x32(8192, 6144, false), 73728);
-        assert_eq!(block_count_32x32(8192, 8192, false), 98304);
-        assert!(block_count_32x32(8192, 6144, false) > u16::MAX as u32);
-        assert!(block_count_32x32(8192, 8192, false) > u16::MAX as u32);
-        // The largest 4:2:0 mode that still fits, for the boundary the validator enforces.
-        assert!(block_count_32x32(7680, 4320, false) <= u16::MAX as u32);
-    }
-
-    /// The wire-budget tracker: converges its EMA onto the measured AU/bitstream inflation,
-    /// deflates the budget by exactly that ratio, and clamps runaway samples.
-    #[test]
-    fn wire_budget_converges_and_deflates() {
-        let mut wb = WireBudget::new();
-        // Prior ≈ ×1.25 (1280/1024): the first deflation is already conservative.
-        assert_eq!(wb.deflate(1_024_000), 819_200);
-        // Feed a steady ×1.30 inflation; the EMA must converge onto it.
-        for _ in 0..64 {
-            wb.observe(1000, 1300);
-        }
-        let b = wb.deflate(1_024_000);
-        let expect = 1_024_000_u64 * 1000 / 1300;
-        assert!(
-            (b as i64 - expect as i64).unsigned_abs() < 8_000,
-            "budget {b} should approach {expect}"
-        );
-        // A dense-ish run (×1.0) walks it back down to no deflation.
-        for _ in 0..64 {
-            wb.observe(1000, 1000);
-        }
-        assert_eq!(wb.deflate(1_024_000), 1_024_000);
-        // Garbage samples are clamped: an absurd ratio can at most halve the budget…
-        for _ in 0..256 {
-            wb.observe(10, 1000);
-        }
-        assert!(wb.deflate(1_024_000) >= 512_000);
-        // …and a zero-length observation is ignored, never a division by zero.
-        wb.observe(0, 1000);
    }

    #[test]
@@ -1,178 +0,0 @@
-//! The slot-family RFI (reference-frame invalidation) recovery **policy**, shared by the three
-//! backends that answer a loss with a re-reference to a known-good older frame instead of an IDR:
-//! native AMF (user-LTR bitfield), native QSV (`mfxExtRefListCtrl` LTR) and Vulkan Video (the
-//! app-owned DPB slot table). One decision, three mechanisms — the policy lived as three
-//! hand-copies and had already diverged once (the fecbec2d taint sweep reached AMF/QSV a commit
-//! before the Vulkan backend was carved out, and Vulkan shipped without it until a later fix).
-//! The NVENC twins' *range* policy is the other half of WP7.2, in
-//! [`super::nvenc_core::plan_range_recovery`].
-//!
-//! Policy only. Every mechanism — how a force is applied, how distrust is *persisted* (AMF clears
-//! its mirror slot to `None`, QSV sets a separate `ltr_tainted` flag because its mirror must keep
-//! naming the slot for the RejectedRefList, Vulkan blanks `slot_wire` to `-1` while `slot_poc`
-//! keeps the picture resident for the RPS) — stays in its backend. Callers feed their
-//! **currently-trusted** references and apply the returned taints through their own marker; that
-//! caller-side filter is exactly what makes the three persistence schemes equivalent under one
-//! pure function.
-//!
-//! The decline arm is also the backend's: AMF/QSV clear an un-consumed `pending_force` (the sweep
-//! may have emptied the slot it points at), while Vulkan deliberately leaves `pending_loss` armed
-//! (a stale arm is re-resolved at frame-build, where a failed re-pick forces the IDR that heals
-//! the stream). Do not harmonize them here.
-
-/// One loss event's recovery decision over a slot table: which trusted references become
-/// untrustworthy, and which one anchors the recovery.
-pub(super) struct SlotPlan {
-    /// Bitmask of slots whose reference was encoded **at or after** the loss start — inside the
-    /// client's corrupt window, so the client either never received it or decoded it against a
-    /// broken chain. Serving one as "known-good" on a LATER loss ships corruption tagged as the
-    /// recovery anchor; the backend must record the distrust in its own persistent marker, because
-    /// these wires would otherwise look like valid pre-loss anchors to the next loss event.
-    pub(super) tainted: u32,
-    /// The recovery anchor: the newest trusted reference **strictly older** than the loss —
-    /// `(slot, wire)` — i.e. the most recent picture the client still holds intact, so
-    /// re-referencing it costs the smallest residual. `None`: every candidate is inside or after
-    /// the corrupt window — the caller declines and its (coalesced) keyframe path recovers.
-    pub(super) anchor: Option<(usize, i64)>,
-}
-
-/// Plan the recovery for a loss starting at wire frame `loss_first`, over the backend's
-/// currently-trusted references (`(slot, wire)`; previously-distrusted entries must already be
-/// filtered out by the caller — see the module doc). Sweep and pick are one call so the anchor is
-/// chosen from the same snapshot the taints are computed from, by construction: the anchor
-/// delegates to [`pick_anchor`], and `wire >= loss_first` (taint) and `wire < loss_first`
-/// (anchor) are disjoint, so a slot tainted by this call can never be this call's anchor.
-pub(super) fn plan_slot_recovery(refs: &[(usize, i64)], loss_first: i64) -> SlotPlan {
-    // The callers' validity gate (`first < 0 → decline`) is what makes their sentinel filters
-    // (-1 / `None`) exact views of "trusted"; this assert keeps the contract visible from inside
-    // the extracted code. Plain assert: the lint legs run --release, and a compiled-out check
-    // here would silently drop taints instead of failing loudly.
-    assert!(
-        loss_first >= 0,
-        "loss_first must be validity-gated by the caller"
-    );
-    let mut tainted = 0u32;
-    for &(slot, wire) in refs {
-        if wire >= loss_first {
-            assert!(slot < 32, "slot table exceeds the u32 taint mask");
-            tainted |= 1 << slot;
-        }
-    }
-    SlotPlan {
-        tainted,
-        anchor: pick_anchor(refs, loss_first),
-    }
-}
-
-/// The pick half alone: newest trusted reference strictly older than the loss. Ties break to the
-/// first entry in `refs` (every caller feeds ascending slot order, so the lowest slot wins —
-/// the strict `>` all three backends used). Standalone because Vulkan re-picks at frame-build
-/// time: its arm carries the loss start, not the slot, so the slot is resolved against the table
-/// as it stands when the recovery frame is actually encoded.
-pub(super) fn pick_anchor(refs: &[(usize, i64)], loss_first: i64) -> Option<(usize, i64)> {
-    let mut best: Option<(usize, i64)> = None;
-    for &(slot, wire) in refs {
-        if wire < loss_first && best.is_none_or(|(_, b)| wire > b) {
-            best = Some((slot, wire));
-        }
-    }
-    best
-}
-
-#[cfg(test)]
-mod tests {
-    use super::{pick_anchor, plan_slot_recovery};
-
-    /// Adapt a raw slot table (the Vulkan `slot_wire` shape: `-1` = empty) into the trusted view
-    /// the policy takes — the same filter the backend adapters apply.
-    fn view(wires: &[i64]) -> Vec<(usize, i64)> {
-        wires
-            .iter()
-            .enumerate()
-            .filter_map(|(s, &w)| (w >= 0).then_some((s, w)))
-            .collect()
-    }
-
-    /// Apply a plan's taints the way the Vulkan adapter does (blank the wire) — the persistence
-    /// half the pure fn hands back to the caller.
-    fn apply(wires: &mut [i64], tainted: u32) {
-        for (s, w) in wires.iter_mut().enumerate() {
-            if tainted & (1 << s) != 0 {
-                *w = -1;
-            }
-        }
-    }
-
-    /// The RFI anchor picker: newest resident wire strictly older than the loss; empty/newer
-    /// slots never qualify. (Migrated 1:1 from `vulkan_video.rs`'s `pick_recovery_slot` tests —
-    /// same vectors, now `(slot, wire)`-valued.)
-    #[test]
-    fn picks_newest_pre_loss() {
-        // slots hold wires 5..12 (ring position arbitrary); loss starts at 9 → anchor = wire 8.
-        let wires = [8i64, 9, 10, 11, 12, 5, 6, 7];
-        assert_eq!(pick_anchor(&view(&wires), 9), Some((0, 8)));
-        // loss older than everything resident → no anchor (caller keyframes).
-        assert_eq!(pick_anchor(&view(&wires), 5), None);
-        // empty slots (-1) are skipped by the view filter and never anchor.
-        assert_eq!(pick_anchor(&view(&[-1, 3, -1, 4]), 5), Some((3, 4)));
-        assert_eq!(pick_anchor(&view(&[-1; 8]), 5), None);
-        // wire == loss_first is INSIDE the corrupt window: strictly-older only.
-        assert_eq!(pick_anchor(&view(&[9, 8]), 9), Some((1, 8)));
-        // tie on the wire → first entry (= lowest slot) wins, the strict `>` all three backends
-        // used.
-        assert_eq!(pick_anchor(&[(2, 7), (5, 7)], 9), Some((2, 7)));
-        // empty view.
-        assert_eq!(pick_anchor(&[], 9), None);
-    }
-
-    /// The taint sweep (fecbec2d's fix): a slot encoded inside an EARLIER, still unrepaired loss
-    /// window must not become the "known-good" anchor of a LATER loss. Without persisted
-    /// distrust the picker accepts it — it is resident and its wire is below the second loss
-    /// start — and the frame ships tagged `recovery_anchor`, lifting the client's freeze onto a
-    /// reference it never decoded. (Migrated 1:1 from `vulkan_video.rs`; the hand-replicated
-    /// sweep is now `plan_slot_recovery` itself.)
-    #[test]
-    fn taint_sweep_excludes_slots_from_an_earlier_loss() {
-        // Slots hold wires 0..7. Loss 1 starts at wire 4, so wires 4..7 are undecodable at the
-        // client. A second loss report arrives at wire 6 while they are all still resident.
-        let tainted_wires = [4i64, 5, 6, 7];
-
-        // WITHOUT the sweep this is the bug: the newest wire below 6 is wire 5 — squarely inside
-        // loss 1's unrepaired window — and it would be served as the "known-good" anchor.
-        let unswept = [0i64, 1, 2, 3, 4, 5, 6, 7];
-        let (_, picked_wire) = pick_anchor(&view(&unswept), 6).expect("unswept picks something");
-        assert!(
-            tainted_wires.contains(&picked_wire),
-            "precondition: without the sweep the anchor comes from the earlier loss window"
-        );
-
-        // WITH the plan, loss 1 taints 4..7 (and anchors on wire 3 — never a tainted wire, by
-        // the disjoint predicates), so loss 2 can only reach genuinely clean wires.
-        let mut wires = unswept;
-        let plan = plan_slot_recovery(&view(&wires), 4);
-        assert_eq!(plan.tainted, 0b1111_0000);
-        assert_eq!(plan.anchor, Some((3, 3)));
-        apply(&mut wires, plan.tainted);
-        assert_eq!(wires, [0, 1, 2, 3, -1, -1, -1, -1]);
-        let (slot, wire) = pick_anchor(&view(&wires), 6).expect("clean wires remain");
-        assert_eq!((slot, wire), (3, 3), "newest clean survivor is wire 3");
-
-        // Encoding resumes after recovery; wires 8..11 refill the swept slots and are clean. A
-        // later loss at wire 10 legitimately anchors on wire 9 — the sweep must not over-reject.
-        wires[4] = 8;
-        wires[5] = 9;
-        wires[6] = 10;
-        wires[7] = 11;
-        let plan = plan_slot_recovery(&view(&wires), 10);
-        assert_eq!(plan.anchor, Some((5, 9)), "wire 9 is post-recovery, clean");
-        apply(&mut wires, plan.tainted);
-
-        // A loss covering every live wire leaves nothing clean → decline, caller serves an IDR.
-        let mut all = [5i64, 6, 7, 8, 9, 10, 11, 12];
-        let plan = plan_slot_recovery(&view(&all), 5);
-        assert_eq!(plan.tainted, 0b1111_1111);
-        assert_eq!(plan.anchor, None);
-        apply(&mut all, plan.tainted);
-        assert_eq!(pick_anchor(&view(&all), 5), None);
-    }
-}
@@ -51,24 +51,6 @@ pub struct OpenH264Encoder {
 // whole value to that thread is therefore sound — there is no concurrent access to the handle.
 unsafe impl Send for OpenH264Encoder {}

-/// openh264's own ceiling: level 5.2, so 3840x2160 landscape or 2160x3840 portrait.
-///
-/// The long edge may reach 3840 and the short edge 2160 — the rule is orientation-aware, not a
-/// per-axis `w <= 3840 && h <= 2160`, so a portrait 2160x3840 session is legal.
-const OPENH264_MAX_LONG_EDGE: u32 = 3840;
-const OPENH264_MAX_SHORT_EDGE: u32 = 2160;
-
-/// Whether the bundled openh264 can encode this resolution at all.
-///
-/// Mirrors the check inside the crate we ship (openh264 0.9.3, `encoder.rs` `reinit`). That check
-/// runs on the FIRST ENCODE, not at encoder construction — so without this gate a too-large mode
-/// opens perfectly and then fails *every* submit, and the session connects and never delivers a
-/// frame. `Codec::max_dimension` does not cover it: it is keyed on the codec, and H.264 legitimately
-/// reaches 4096 on every hardware backend — this ceiling belongs to the software backend alone.
-fn openh264_supports_dimensions(width: u32, height: u32) -> bool {
-    width.max(height) <= OPENH264_MAX_LONG_EDGE && width.min(height) <= OPENH264_MAX_SHORT_EDGE
-}
-
 impl OpenH264Encoder {
    pub fn open(
        format: PixelFormat,
@@ -77,16 +59,7 @@ impl OpenH264Encoder {
        fps: u32,
        bitrate_bps: u64,
    ) -> Result<Self> {
-        // validate_dimensions() ran in open_video: even, non-zero, <= 4096. That leaves modes this
-        // encoder cannot serve (e.g. a legal 4096-wide H.264 mode), so refuse them here — at the
-        // open, where the caller still gets a real error — rather than at every submit.
-        ensure!(
-            openh264_supports_dimensions(width, height),
-            "openh264 cannot encode {width}x{height}: the software encoder tops out at \
-             {OPENH264_MAX_LONG_EDGE}x{OPENH264_MAX_SHORT_EDGE} (or \
-             {OPENH264_MAX_SHORT_EDGE}x{OPENH264_MAX_LONG_EDGE} portrait) — lower the client \
-             resolution, or use a host with a hardware encoder"
-        );
+        // validate_dimensions() ran in open_video: even, non-zero, <= 4096.
        let bps: u32 = bitrate_bps.try_into().unwrap_or(u32::MAX);
        let cfg = EncoderConfig::new()
            .usage_type(UsageType::ScreenContentRealTime)
@@ -363,40 +336,4 @@ mod tests {
            .any(|w| w[0] == 0 && w[1] == 0 && w[2] == 0 && w[3] == 1 && (w[4] & 0x1f) == 7);
        assert!(has_sps, "IDR must carry an SPS NAL (type 7)");
    }
-
-    /// The modes the software encoder can actually serve — including the portrait orientation,
-    /// which a naive per-axis `w <= 3840 && h <= 2160` would wrongly reject.
-    #[test]
-    fn openh264_accepts_up_to_4k_in_either_orientation() {
-        assert!(openh264_supports_dimensions(1920, 1080));
-        assert!(openh264_supports_dimensions(3840, 2160));
-        assert!(openh264_supports_dimensions(2160, 3840));
-        assert!(openh264_supports_dimensions(1080, 1920));
-    }
-
-    /// Modes `validate_dimensions` lets through (H.264 legitimately reaches 4096 on hardware) but
-    /// openh264 rejects on the first encode. Catching them at open is the whole point of the gate:
-    /// otherwise the session opens and then fails every single submit.
-    #[test]
-    fn openh264_rejects_modes_that_would_fail_on_first_submit() {
-        // 4096-wide is legal H.264 and passes `Codec::max_dimension`, but exceeds the long edge.
-        assert!(!openh264_supports_dimensions(4096, 2160));
-        assert!(!openh264_supports_dimensions(2160, 4096));
-        // Long edge is fine, short edge is not (e.g. an ultrawide-tall composite desktop).
-        assert!(!openh264_supports_dimensions(3840, 2400));
-        assert!(!openh264_supports_dimensions(2400, 3840));
-    }
-
-    /// A too-large mode must fail at `open`, not silently at every `submit`.
-    #[test]
-    fn open_refuses_a_mode_openh264_cannot_encode() {
-        // Matched rather than `expect_err`: `OpenH264Encoder` is not `Debug` (it wraps a raw C
-        // handle), so `expect_err` would not compile.
-        let err = match OpenH264Encoder::open(PixelFormat::Bgra, 4096, 2160, 60, 20_000_000) {
-            Ok(_) => panic!("4096x2160 exceeds openh264's long-edge ceiling and must be refused"),
-            Err(e) => e,
-        };
-        let msg = format!("{err:#}");
-        assert!(msg.contains("openh264 cannot encode 4096x2160"), "{msg}");
-    }
 }
@@ -66,11 +66,425 @@ use windows::Win32::Storage::FileSystem::{
 };
 use windows::Win32::System::LibraryLoader::GetModuleFileNameW;

-// The hand-mirrored AMF C ABI lives in `amf_sys.rs` (WP7.4): pure FFI surface, no policy —
-// isolating the unsafe vtable mirror from the encoder logic is the crate's stated review
-// goal, and the `#[path]` keeps the module name (`sys::`) and every call site unchanged.
-#[path = "amf_sys.rs"]
-mod sys;
+// ---------------------------------------------------------------------------------------------
+// Mirrored AMF C ABI (written against GPUOpen header release v1.4.36 — amf/public/include; every
+// slot below is a base-interface slot whose layout is stable since <= v1.4.34, the loader's
+// accepted ABI floor, so the mirror is valid on every runtime the loader admits).
+//
+// Layout rules this mirror relies on: every AMF interface is a struct whose sole member is a
+// pointer to a C vtable; derived interfaces PREPEND their base's slots in order (AMFInterface →
+// AMFPropertyStorage → AMFData → AMFBuffer/AMFSurface), so a derived pointer is usable through a
+// base vtable mirror. Slots we never call are declared as bare `*const c_void` placeholders —
+// same size/alignment as the function pointer they stand in for. `AMF_STD_CALL` is `__stdcall`
+// (Rust `extern "system"`); the two DLL entry points are `__cdecl` (`extern "C"`); on x86_64
+// both collapse to the one Windows calling convention.
+// ---------------------------------------------------------------------------------------------
+mod sys {
+    use std::ffi::c_void;
+
+    /// `AMF_RESULT` (core/Result.h) — a plain C enum, sequential from 0. Only the codes this
+    /// module branches on are named; everything else is reported numerically via [`result_name`].
+    pub type AmfResult = i32;
+    pub const AMF_OK: AmfResult = 0;
+    pub const AMF_EOF: AmfResult = 23;
+    pub const AMF_REPEAT: AmfResult = 24;
+    pub const AMF_INPUT_FULL: AmfResult = 25;
+    pub const AMF_NEED_MORE_INPUT: AmfResult = 44;
+
+    /// Human-readable name for an `AMF_RESULT` (diagnostics only — the numeric value rides along
+    /// so an unnamed code is still identifiable against Result.h).
+    pub fn result_name(r: AmfResult) -> &'static str {
+        match r {
+            0 => "AMF_OK",
+            1 => "AMF_FAIL",
+            2 => "AMF_UNEXPECTED",
+            3 => "AMF_ACCESS_DENIED",
+            4 => "AMF_INVALID_ARG",
+            5 => "AMF_OUT_OF_RANGE",
+            6 => "AMF_OUT_OF_MEMORY",
+            7 => "AMF_INVALID_POINTER",
+            8 => "AMF_NO_INTERFACE",
+            9 => "AMF_NOT_IMPLEMENTED",
+            10 => "AMF_NOT_SUPPORTED",
+            11 => "AMF_NOT_FOUND",
+            12 => "AMF_ALREADY_INITIALIZED",
+            13 => "AMF_NOT_INITIALIZED",
+            14 => "AMF_INVALID_FORMAT",
+            15 => "AMF_WRONG_STATE",
+            17 => "AMF_NO_DEVICE",
+            18 => "AMF_DIRECTX_FAILED",
+            23 => "AMF_EOF",
+            24 => "AMF_REPEAT",
+            25 => "AMF_INPUT_FULL",
+            26 => "AMF_RESOLUTION_CHANGED",
+            28 => "AMF_INVALID_DATA_TYPE",
+            29 => "AMF_INVALID_RESOLUTION",
+            30 => "AMF_CODEC_NOT_SUPPORTED",
+            31 => "AMF_SURFACE_FORMAT_NOT_SUPPORTED",
+            32 => "AMF_SURFACE_MUST_BE_SHARED",
+            36 => "AMF_ENCODER_NOT_PRESENT",
+            44 => "AMF_NEED_MORE_INPUT",
+            _ => "AMF_<unnamed>",
+        }
+    }
+
+    /// The AMF header release this FFI mirror was written against: `AMF_FULL_VERSION` for 1.4.36.0
+    /// (core/Version.h `AMF_MAKE_FULL_VERSION`). This is the version claimed to `AMFInit` — but
+    /// capped at the runtime's own reported version (see `load_factory`), so an older-but-accepted
+    /// runtime is asked only for the ABI it actually provides.
+    pub const AMF_HEADER_VERSION: u64 = (1u64 << 48) | (4u64 << 32) | (36u64 << 16);
+
+    /// The oldest AMF runtime the loader accepts (`AMF_FULL_VERSION` 1.4.34.0 — AMD Adrenalin
+    /// 24.6.1). This is an **ABI floor, not a feature floor**: every vtable slot mirrored in this
+    /// module belongs to a base interface (`AMFFactory`/`AMFContext`/`AMFComponent`/`AMFData`/
+    /// `AMFBuffer`) whose layout has been stable — append-only, no mid-vtable insertions — since
+    /// well before 1.4.34, so a 1.4.34 runtime is guaranteed to expose every mirrored slot at its
+    /// mirrored offset. Everything 1.4.35/1.4.36 added that this path can touch (new HQ presets,
+    /// AV1 B-frame / picture management) is a *string-keyed encoder property*, applied through
+    /// [`set_prop`] with `required=false` — a runtime that lacks it rejects the property (logged)
+    /// and the feature degrades, rather than shifting any vtable offset. Below this floor the
+    /// mirror is not guaranteed to match, so the loader declines cleanly (an old-driver decline,
+    /// never UB).
+    pub const AMF_MIN_VERSION: u64 = (1u64 << 48) | (4u64 << 32) | (34u64 << 16);
+
+    /// `AMF_SURFACE_FORMAT` (core/Surface.h).
+    pub const AMF_SURFACE_NV12: i32 = 1;
+    pub const AMF_SURFACE_P010: i32 = 10;
+
+    /// `AMF_DX_VERSION::AMF_DX11_1` (core/Data.h) — the `InitDX11` version argument.
+    pub const AMF_DX11_1: i32 = 111;
+
+    /// `AMF_MEMORY_TYPE::AMF_MEMORY_HOST` (core/Data.h) — the `AllocBuffer` memory type for the
+    /// CPU-filled HDR-metadata buffer.
+    pub const AMF_MEMORY_HOST: i32 = 1;
+
+    /// `AMFHDRMetadata` (components/ColorSpace.h) — the payload of the `*InHDRMetadata` encoder
+    /// property (an `AMFBuffer` holding exactly this struct). Same units as the HEVC ST.2086 SEI
+    /// and [`punktfunk_core::quic::HdrMeta`]: chromaticities in 1/50000, mastering luminance in
+    /// 0.0001 cd/m², CLL/FALL in nits. 28 bytes, no padding.
+    #[repr(C)]
+    pub struct AmfHdrMetadata {
+        pub red_primary: [u16; 2],
+        pub green_primary: [u16; 2],
+        pub blue_primary: [u16; 2],
+        pub white_point: [u16; 2],
+        pub max_mastering_luminance: u32,
+        pub min_mastering_luminance: u32,
+        pub max_content_light_level: u16,
+        pub max_frame_average_light_level: u16,
+    }
+
+    /// `AMFGuid` (core/Platform.h) — data41..data48 flattened into an array (identical layout).
+    #[repr(C)]
+    pub struct AmfGuid {
+        pub data1: u32,
+        pub data2: u16,
+        pub data3: u16,
+        pub data4: [u8; 8],
+    }
+
+    /// `IID_AMFBuffer` (core/Buffer.h `AMF_DECLARE_IID`) — for `QueryInterface` on the encoder's
+    /// output `AMFData` to reach `GetNative`/`GetSize`.
+    pub const IID_AMF_BUFFER: AmfGuid = AmfGuid {
+        data1: 0xb04b_7248,
+        data2: 0xb6f0,
+        data3: 0x4321,
+        data4: [0xb6, 0x91, 0xba, 0xa4, 0x74, 0x0f, 0x9f, 0xcb],
+    };
+
+    // `AMF_VARIANT_TYPE` (core/Variant.h) — the tags this module writes/reads.
+    pub const AMF_VARIANT_BOOL: i32 = 1;
+    pub const AMF_VARIANT_INT64: i32 = 2;
+    pub const AMF_VARIANT_RATE: i32 = 7;
+    pub const AMF_VARIANT_INTERFACE: i32 = 12;
+
+    /// `AMFVariantStruct` (core/Variant.h): a 4-byte C-enum tag + a 16-byte union whose largest
+    /// members are pointer/`amf_int64`/`AMFFloatVector4D` (align 8) → 24 bytes total, tag at 0,
+    /// payload at 8. Passed BY VALUE to `SetProperty` (Win64 passes >8-byte aggregates by hidden
+    /// reference on both sides, so declaring it by value matches the C compiler). The payload is
+    /// stored as two fully-initialised `u64`s — little-endian packing puts a bool in byte 0, an
+    /// `amf_int64` in word 0, and an `AMFRate{num,den}` as `num | den << 32`, exactly the union's
+    /// in-memory layout — so no partially-initialised union bytes ever cross the FFI.
+    #[repr(C)]
+    pub struct AmfVariant {
+        pub vtype: i32,
+        pub payload: [u64; 2],
+    }
+
+    impl AmfVariant {
+        pub fn zeroed() -> Self {
+            AmfVariant {
+                vtype: 0, // AMF_VARIANT_EMPTY
+                payload: [0, 0],
+            }
+        }
+        pub fn from_i64(v: i64) -> Self {
+            AmfVariant {
+                vtype: AMF_VARIANT_INT64,
+                payload: [v as u64, 0],
+            }
+        }
+        pub fn from_bool(v: bool) -> Self {
+            AmfVariant {
+                vtype: AMF_VARIANT_BOOL,
+                payload: [v as u64, 0],
+            }
+        }
+        /// `AMFRate { num, den }` — two little-endian `amf_uint32`s in the union's first 8 bytes.
+        pub fn from_rate(num: u32, den: u32) -> Self {
+            AmfVariant {
+                vtype: AMF_VARIANT_RATE,
+                payload: [num as u64 | ((den as u64) << 32), 0],
+            }
+        }
+        /// An `AMFInterface*` payload (`pInterface` in the union's first 8 bytes). The property
+        /// storage AddRefs the interface when it copies the variant in (the C++ template
+        /// `SetProperty(name, AMFVariant(value))` passes a temporary whose destructor releases,
+        /// so `SetProperty` must take its own reference) — the caller keeps sole ownership of the
+        /// reference it already holds.
+        pub fn from_interface(p: *mut c_void) -> Self {
+            AmfVariant {
+                vtype: AMF_VARIANT_INTERFACE,
+                payload: [p as usize as u64, 0],
+            }
+        }
+        /// Read back an `amf_int64` payload (only valid when `vtype == AMF_VARIANT_INT64`).
+        pub fn as_i64(&self) -> Option<i64> {
+            (self.vtype == AMF_VARIANT_INT64).then_some(self.payload[0] as i64)
+        }
+    }
+
+    /// Placeholder for a vtable slot this module never calls — same size/align as the function
+    /// pointer it stands in for, present only to keep the following slots at their C offsets.
+    pub type Slot = *const c_void;
+
+    // -- AMFFactory (core/Factory.h; NOT refcounted — a process singleton) ----------------------
+    #[repr(C)]
+    pub struct AmfFactory {
+        pub vtbl: *const AmfFactoryVtbl,
+    }
+    #[repr(C)]
+    pub struct AmfFactoryVtbl {
+        pub create_context:
+            unsafe extern "system" fn(*mut AmfFactory, *mut *mut AmfContext) -> AmfResult,
+        pub create_component: unsafe extern "system" fn(
+            *mut AmfFactory,
+            *mut AmfContext,
+            *const u16,
+            *mut *mut AmfComponent,
+        ) -> AmfResult,
+        pub set_cache_folder: Slot,
+        pub get_cache_folder: Slot,
+        pub get_debug: Slot,
+        pub get_trace: Slot,
+        pub get_programs: Slot,
+    }
+
+    // -- AMFContext (core/Context.h) ------------------------------------------------------------
+    #[repr(C)]
+    pub struct AmfContext {
+        pub vtbl: *const AmfContextVtbl,
+    }
+    #[repr(C)]
+    pub struct AmfContextVtbl {
+        // AMFInterface
+        pub acquire: Slot,
+        pub release: unsafe extern "system" fn(*mut AmfContext) -> i32,
+        pub query_interface: Slot,
+        // AMFPropertyStorage
+        pub set_property: Slot,
+        pub get_property: Slot,
+        pub has_property: Slot,
+        pub get_property_count: Slot,
+        pub get_property_at: Slot,
+        pub clear: Slot,
+        pub add_to: Slot,
+        pub copy_to: Slot,
+        pub add_observer: Slot,
+        pub remove_observer: Slot,
+        // AMFContext
+        pub terminate: unsafe extern "system" fn(*mut AmfContext) -> AmfResult,
+        pub init_dx9: Slot,
+        pub get_dx9_device: Slot,
+        pub lock_dx9: Slot,
+        pub unlock_dx9: Slot,
+        pub init_dx11: unsafe extern "system" fn(*mut AmfContext, *mut c_void, i32) -> AmfResult,
+        pub get_dx11_device: Slot,
+        pub lock_dx11: Slot,
+        pub unlock_dx11: Slot,
+        pub init_opencl: Slot,
+        pub get_opencl_context: Slot,
+        pub get_opencl_command_queue: Slot,
+        pub get_opencl_device_id: Slot,
+        pub get_opencl_compute_factory: Slot,
+        pub init_opencl_ex: Slot,
+        pub lock_opencl: Slot,
+        pub unlock_opencl: Slot,
+        pub init_opengl: Slot,
+        pub get_opengl_context: Slot,
+        pub get_opengl_drawable: Slot,
+        pub lock_opengl: Slot,
+        pub unlock_opengl: Slot,
+        pub init_xv: Slot,
+        pub get_xv_device: Slot,
+        pub lock_xv: Slot,
+        pub unlock_xv: Slot,
+        pub init_gralloc: Slot,
+        pub get_gralloc_device: Slot,
+        pub lock_gralloc: Slot,
+        pub unlock_gralloc: Slot,
+        pub alloc_buffer: unsafe extern "system" fn(
+            *mut AmfContext,
+            i32, // AMF_MEMORY_TYPE
+            usize,
+            *mut *mut AmfBuffer,
+        ) -> AmfResult,
+        pub alloc_surface: Slot,
+        pub alloc_audio_buffer: Slot,
+        pub create_buffer_from_host_native: Slot,
+        pub create_surface_from_host_native: Slot,
+        pub create_surface_from_dx9_native: Slot,
+        /// Out-param is `AMFSurface**` in the header; declared as the `AmfData` base here because
+        /// every surface call this module makes (`SetPts`, `SetProperty`, `Release`,
+        /// `SubmitInput`) lives in the `AMFData` vtable prefix, which `AMFSurfaceVtbl` reproduces
+        /// slot-for-slot (single inheritance, same object pointer).
+        pub create_surface_from_dx11_native: unsafe extern "system" fn(
+            *mut AmfContext,
+            *mut c_void,
+            *mut *mut AmfData,
+            *mut c_void,
+        ) -> AmfResult,
+        pub create_surface_from_opengl_native: Slot,
+        pub create_surface_from_gralloc_native: Slot,
+        pub create_surface_from_opencl_native: Slot,
+        pub create_buffer_from_opencl_native: Slot,
+        pub get_compute: Slot,
+    }
+
+    // -- AMFComponent (components/Component.h) --------------------------------------------------
+    #[repr(C)]
+    pub struct AmfComponent {
+        pub vtbl: *const AmfComponentVtbl,
+    }
+    #[repr(C)]
+    pub struct AmfComponentVtbl {
+        // AMFInterface
+        pub acquire: Slot,
+        pub release: unsafe extern "system" fn(*mut AmfComponent) -> i32,
+        pub query_interface: Slot,
+        // AMFPropertyStorage
+        pub set_property:
+            unsafe extern "system" fn(*mut AmfComponent, *const u16, AmfVariant) -> AmfResult,
+        pub get_property: Slot,
+        pub has_property: Slot,
+        pub get_property_count: Slot,
+        pub get_property_at: Slot,
+        pub clear: Slot,
+        pub add_to: Slot,
+        pub copy_to: Slot,
+        pub add_observer: Slot,
+        pub remove_observer: Slot,
+        // AMFPropertyStorageEx
+        pub get_properties_info_count: Slot,
+        pub get_property_info_at: Slot,
+        pub get_property_info: Slot,
+        pub validate_property: Slot,
+        // AMFComponent
+        pub init: unsafe extern "system" fn(*mut AmfComponent, i32, i32, i32) -> AmfResult,
+        pub reinit: Slot,
+        pub terminate: unsafe extern "system" fn(*mut AmfComponent) -> AmfResult,
+        pub drain: unsafe extern "system" fn(*mut AmfComponent) -> AmfResult,
+        pub flush: unsafe extern "system" fn(*mut AmfComponent) -> AmfResult,
+        pub submit_input: unsafe extern "system" fn(*mut AmfComponent, *mut AmfData) -> AmfResult,
+        pub query_output:
+            unsafe extern "system" fn(*mut AmfComponent, *mut *mut AmfData) -> AmfResult,
+        pub get_context: Slot,
+        pub set_output_data_allocator_cb: Slot,
+        pub get_caps: Slot,
+        pub optimize: Slot,
+    }
+
+    // -- AMFData (core/Data.h) — also the usable prefix of AMFSurface --------------------------
+    #[repr(C)]
+    pub struct AmfData {
+        pub vtbl: *const AmfDataVtbl,
+    }
+    #[repr(C)]
+    pub struct AmfDataVtbl {
+        // AMFInterface
+        pub acquire: Slot,
+        pub release: unsafe extern "system" fn(*mut AmfData) -> i32,
+        pub query_interface:
+            unsafe extern "system" fn(*mut AmfData, *const AmfGuid, *mut *mut c_void) -> AmfResult,
+        // AMFPropertyStorage
+        pub set_property:
+            unsafe extern "system" fn(*mut AmfData, *const u16, AmfVariant) -> AmfResult,
+        pub get_property:
+            unsafe extern "system" fn(*mut AmfData, *const u16, *mut AmfVariant) -> AmfResult,
+        pub has_property: Slot,
+        pub get_property_count: Slot,
+        pub get_property_at: Slot,
+        pub clear: Slot,
+        pub add_to: Slot,
+        pub copy_to: Slot,
+        pub add_observer: Slot,
+        pub remove_observer: Slot,
+        // AMFData
+        pub get_memory_type: Slot,
+        pub duplicate: Slot,
+        pub convert: Slot,
+        pub interop: Slot,
+        pub get_data_type: Slot,
+        pub is_reusable: Slot,
+        pub set_pts: unsafe extern "system" fn(*mut AmfData, i64),
+        pub get_pts: Slot,
+        pub set_duration: Slot,
+        pub get_duration: Slot,
+    }
+
+    // -- AMFBuffer (core/Buffer.h) — the encoder's output object -------------------------------
+    #[repr(C)]
+    pub struct AmfBuffer {
+        pub vtbl: *const AmfBufferVtbl,
+    }
+    #[repr(C)]
+    pub struct AmfBufferVtbl {
+        // AMFInterface + AMFPropertyStorage + AMFData prefix (identical order to AmfDataVtbl).
+        pub acquire: Slot,
+        pub release: unsafe extern "system" fn(*mut AmfBuffer) -> i32,
+        pub query_interface: Slot,
+        pub set_property: Slot,
+        pub get_property: Slot,
+        pub has_property: Slot,
+        pub get_property_count: Slot,
+        pub get_property_at: Slot,
+        pub clear: Slot,
+        pub add_to: Slot,
+        pub copy_to: Slot,
+        pub add_observer: Slot,
+        pub remove_observer: Slot,
+        pub get_memory_type: Slot,
+        pub duplicate: Slot,
+        pub convert: Slot,
+        pub interop: Slot,
+        pub get_data_type: Slot,
+        pub is_reusable: Slot,
+        pub set_pts: Slot,
+        pub get_pts: Slot,
+        pub set_duration: Slot,
+        pub get_duration: Slot,
+        // AMFBuffer
+        pub set_size: Slot,
+        pub get_size: unsafe extern "system" fn(*mut AmfBuffer) -> usize,
+        pub get_native: unsafe extern "system" fn(*mut AmfBuffer) -> *mut c_void,
+        pub add_observer_buffer: Slot,
+        pub remove_observer_buffer: Slot,
+    }
+
+    // -- DLL entry points (core/Factory.h; AMF_CDECL_CALL) --------------------------------------
+    pub type AmfQueryVersionFn = unsafe extern "C" fn(*mut u64) -> AmfResult;
+    pub type AmfInitFn = unsafe extern "C" fn(u64, *mut *mut AmfFactory) -> AmfResult;
+}

 use sys::{result_name, AmfVariant};

@@ -858,11 +1272,7 @@ impl AmfEncoder {
        if codec == Codec::Av1 && !probe_can_encode(Codec::Av1) {
            bail!("this GPU/driver declined AV1 encode (RDNA3+ required) — native AMF probe");
        }
-        // Depth follows the delivered pixels, not the negotiated depth ([`crate::ten_bit_input`]).
-        // With the old `bit_depth >= 10 || …` shape a 10-bit-negotiated session over an 8-bit
-        // capture derived `expected = P010`, tripped the format check below and ended the session
-        // at open — on exactly the configuration the capturer had already downgraded on purpose.
-        let ten_bit = crate::ten_bit_input(format, bit_depth);
+        let ten_bit = bit_depth >= 10 || matches!(format, PixelFormat::P010 | PixelFormat::Rgb10a2);
        // Zero-copy by construction: the input ring is NV12/P010 fed by same-format
        // CopySubresourceRegion. Any other capture format (Bgra/Rgb10a2 video-processor fallback,
        // CPU frames) has no native input path — and since Phase 3 no ffmpeg readback to degrade
@@ -1959,27 +2369,31 @@ impl Encoder for AmfEncoder {
        if !self.ltr_active || first < 0 || first > last {
            return false;
        }
-        // The taint-sweep + anchor-pick POLICY lives in `rfi::plan_slot_recovery` (one decision
-        // shared with QSV and Vulkan Video); this backend's mechanism is: distrust = clear the
-        // mirror slot (dropped slots stay dropped; the cadence re-marks a clean frame within
-        // ~1/4 s). `ltr_slots` store the WIRE frame index of the marked frame (`submit_indexed`
-        // pins `frame_idx` to it per submission), so they compare directly against the client's
-        // `first` — and stay comparable across encoder rebuilds/resets, where an internal counter
-        // would make the pre-loss check vacuous and risk force-referencing an LTR marked INSIDE
-        // the lost range.
-        let view: Vec<(usize, i64)> = self
-            .ltr_slots
-            .iter()
-            .enumerate()
-            .filter_map(|(s, m)| m.map(|w| (s, w)))
-            .collect();
-        let plan = super::rfi::plan_slot_recovery(&view, first);
-        for (slot, marked) in self.ltr_slots.iter_mut().enumerate() {
-            if plan.tainted & (1 << slot) != 0 {
+        // Taint sweep BEFORE picking the anchor: an LTR marked at-or-after the loss start was
+        // encoded inside the client's corrupt window — the client either never received it or
+        // decoded it against a broken reference chain. Serving it as "known-good" on a LATER
+        // loss ships corruption as the recovery anchor (and every subsequent mark re-samples
+        // it). Dropped slots stay dropped; the cadence re-marks a clean frame within ~1/4 s.
+        for marked in self.ltr_slots.iter_mut() {
+            if marked.is_some_and(|idx| idx >= first) {
                *marked = None;
            }
        }
-        match plan.anchor {
+        // Pick the newest LTR strictly OLDER than the loss: the most recent known-good reference the
+        // client still holds, so re-referencing it costs the least (smallest recovery-frame residual).
+        // `ltr_slots` store the WIRE frame index of the marked frame (`submit_indexed` pins
+        // `frame_idx` to it per submission), so they compare directly against the client's `first`
+        // — and stay comparable across encoder rebuilds/resets, where an internal counter would
+        // make this check vacuous and risk force-referencing an LTR marked INSIDE the lost range.
+        let mut best: Option<(usize, i64)> = None;
+        for (slot, marked) in self.ltr_slots.iter().enumerate() {
+            if let Some(idx) = *marked {
+                if idx < first && best.is_none_or(|(_, b)| idx > b) {
+                    best = Some((slot, idx));
+                }
+            }
+        }
+        match best {
            Some((slot, ltr_frame)) => {
                // Queue the force for the next submit; that frame ships tagged `recovery_anchor`.
                self.pending_force = Some(slot);
@@ -2008,12 +2422,13 @@ impl Encoder for AmfEncoder {

    fn caps(&self) -> EncoderCaps {
        EncoderCaps {
-            // As Windows NVENC: the capturer composites; this backend never reads `frame.cursor`.
-            blends_cursor: false,
            // LTR-RFI: AMD's reference invalidation is the user long-term-reference path (mark a
            // frame, force a later one to re-reference it). True only when the live driver accepted
            // the LTR slots at open — otherwise loss recovery falls back to a full IDR.
            supports_rfi: self.ltr_active,
+            // In-band mastering/CLL via `*InHDRMetadata` (HEVC SEI / AV1 metadata OBU); AVC has
+            // no such property (and no HDR sessions negotiate H.264).
+            supports_hdr_metadata: self.ten_bit && self.props.hdr_metadata.is_some(),
            // Permanent: VCN hardware does not encode 4:4:4.
            chroma_444: false,
            // True only when `PUNKTFUNK_INTRA_REFRESH` asked for the wave AND the live driver
@@ -2345,10 +2760,6 @@ mod tests {
    }

    /// The `p`-quantile of `samples` (µs), sorting in place. `0` when empty.
-    /// Gated like its only caller, the `amf-qsv`-only §5.2 latency A/B below — otherwise a
-    /// `--features nvenc,qsv` build compiles this helper with the benchmark cfg'd out and trips
-    /// `dead_code` (which the crate root no longer blanket-allows).
-    #[cfg(feature = "amf-qsv")]
    fn percentile(samples: &mut [u128], p: f64) -> u128 {
        if samples.is_empty() {
            return 0;
@@ -2367,8 +2778,6 @@ mod tests {
    /// so its submit→AU is the bare ASIC time. The last ~2 unflushed frames on the ffmpeg path
    /// are left unmeasured (dropped with the encoder) so every recorded sample is a genuine paced
    /// submit→AU.
-    /// Gated like its only caller (see [`percentile`]).
-    #[cfg(feature = "amf-qsv")]
    #[allow(clippy::too_many_arguments)]
    fn drive_and_measure(
        enc: &mut dyn Encoder,
@@ -2712,6 +3121,10 @@ mod tests {
            }
        };
        enc.set_hdr_meta(Some(sample_hdr_meta()));
+        assert!(
+            enc.caps().supports_hdr_metadata,
+            "HEVC 10-bit reports HDR SEI capability"
+        );
        let mut aus: Vec<EncodedFrame> = Vec::new();
        for i in 0..6 {
            let frame = CapturedFrame {
@@ -1,414 +0,0 @@
-//! Mirrored AMF C ABI (written against GPUOpen header release v1.4.36 — amf/public/include; every
-//! slot below is a base-interface slot whose layout is stable since <= v1.4.34, the loader's
-//! accepted ABI floor, so the mirror is valid on every runtime the loader admits).
-//!
-//! Layout rules this mirror relies on: every AMF interface is a struct whose sole member is a
-//! pointer to a C vtable; derived interfaces PREPEND their base's slots in order (AMFInterface →
-//! AMFPropertyStorage → AMFData → AMFBuffer/AMFSurface), so a derived pointer is usable through a
-//! base vtable mirror. Slots we never call are declared as bare `*const c_void` placeholders —
-//! same size/alignment as the function pointer they stand in for. `AMF_STD_CALL` is `__stdcall`
-//! (Rust `extern "system"`); the two DLL entry points are `__cdecl` (`extern "C"`); on x86_64
-//! both collapse to the one Windows calling convention.
-
-use std::ffi::c_void;
-
-/// `AMF_RESULT` (core/Result.h) — a plain C enum, sequential from 0. Only the codes this
-/// module branches on are named; everything else is reported numerically via [`result_name`].
-pub type AmfResult = i32;
-pub const AMF_OK: AmfResult = 0;
-pub const AMF_EOF: AmfResult = 23;
-pub const AMF_REPEAT: AmfResult = 24;
-pub const AMF_INPUT_FULL: AmfResult = 25;
-pub const AMF_NEED_MORE_INPUT: AmfResult = 44;
-
-/// Human-readable name for an `AMF_RESULT` (diagnostics only — the numeric value rides along
-/// so an unnamed code is still identifiable against Result.h).
-pub fn result_name(r: AmfResult) -> &'static str {
-    match r {
-        0 => "AMF_OK",
-        1 => "AMF_FAIL",
-        2 => "AMF_UNEXPECTED",
-        3 => "AMF_ACCESS_DENIED",
-        4 => "AMF_INVALID_ARG",
-        5 => "AMF_OUT_OF_RANGE",
-        6 => "AMF_OUT_OF_MEMORY",
-        7 => "AMF_INVALID_POINTER",
-        8 => "AMF_NO_INTERFACE",
-        9 => "AMF_NOT_IMPLEMENTED",
-        10 => "AMF_NOT_SUPPORTED",
-        11 => "AMF_NOT_FOUND",
-        12 => "AMF_ALREADY_INITIALIZED",
-        13 => "AMF_NOT_INITIALIZED",
-        14 => "AMF_INVALID_FORMAT",
-        15 => "AMF_WRONG_STATE",
-        17 => "AMF_NO_DEVICE",
-        18 => "AMF_DIRECTX_FAILED",
-        23 => "AMF_EOF",
-        24 => "AMF_REPEAT",
-        25 => "AMF_INPUT_FULL",
-        26 => "AMF_RESOLUTION_CHANGED",
-        28 => "AMF_INVALID_DATA_TYPE",
-        29 => "AMF_INVALID_RESOLUTION",
-        30 => "AMF_CODEC_NOT_SUPPORTED",
-        31 => "AMF_SURFACE_FORMAT_NOT_SUPPORTED",
-        32 => "AMF_SURFACE_MUST_BE_SHARED",
-        36 => "AMF_ENCODER_NOT_PRESENT",
-        44 => "AMF_NEED_MORE_INPUT",
-        _ => "AMF_<unnamed>",
-    }
-}
-
-/// The AMF header release this FFI mirror was written against: `AMF_FULL_VERSION` for 1.4.36.0
-/// (core/Version.h `AMF_MAKE_FULL_VERSION`). This is the version claimed to `AMFInit` — but
-/// capped at the runtime's own reported version (see `load_factory`), so an older-but-accepted
-/// runtime is asked only for the ABI it actually provides.
-pub const AMF_HEADER_VERSION: u64 = (1u64 << 48) | (4u64 << 32) | (36u64 << 16);
-
-/// The oldest AMF runtime the loader accepts (`AMF_FULL_VERSION` 1.4.34.0 — AMD Adrenalin
-/// 24.6.1). This is an **ABI floor, not a feature floor**: every vtable slot mirrored in this
-/// module belongs to a base interface (`AMFFactory`/`AMFContext`/`AMFComponent`/`AMFData`/
-/// `AMFBuffer`) whose layout has been stable — append-only, no mid-vtable insertions — since
-/// well before 1.4.34, so a 1.4.34 runtime is guaranteed to expose every mirrored slot at its
-/// mirrored offset. Everything 1.4.35/1.4.36 added that this path can touch (new HQ presets,
-/// AV1 B-frame / picture management) is a *string-keyed encoder property*, applied through
-/// [`set_prop`] with `required=false` — a runtime that lacks it rejects the property (logged)
-/// and the feature degrades, rather than shifting any vtable offset. Below this floor the
-/// mirror is not guaranteed to match, so the loader declines cleanly (an old-driver decline,
-/// never UB).
-pub const AMF_MIN_VERSION: u64 = (1u64 << 48) | (4u64 << 32) | (34u64 << 16);
-
-/// `AMF_SURFACE_FORMAT` (core/Surface.h).
-pub const AMF_SURFACE_NV12: i32 = 1;
-pub const AMF_SURFACE_P010: i32 = 10;
-
-/// `AMF_DX_VERSION::AMF_DX11_1` (core/Data.h) — the `InitDX11` version argument.
-pub const AMF_DX11_1: i32 = 111;
-
-/// `AMF_MEMORY_TYPE::AMF_MEMORY_HOST` (core/Data.h) — the `AllocBuffer` memory type for the
-/// CPU-filled HDR-metadata buffer.
-pub const AMF_MEMORY_HOST: i32 = 1;
-
-/// `AMFHDRMetadata` (components/ColorSpace.h) — the payload of the `*InHDRMetadata` encoder
-/// property (an `AMFBuffer` holding exactly this struct). Same units as the HEVC ST.2086 SEI
-/// and [`punktfunk_core::quic::HdrMeta`]: chromaticities in 1/50000, mastering luminance in
-/// 0.0001 cd/m², CLL/FALL in nits. 28 bytes, no padding.
-#[repr(C)]
-pub struct AmfHdrMetadata {
-    pub red_primary: [u16; 2],
-    pub green_primary: [u16; 2],
-    pub blue_primary: [u16; 2],
-    pub white_point: [u16; 2],
-    pub max_mastering_luminance: u32,
-    pub min_mastering_luminance: u32,
-    pub max_content_light_level: u16,
-    pub max_frame_average_light_level: u16,
-}
-
-/// `AMFGuid` (core/Platform.h) — data41..data48 flattened into an array (identical layout).
-#[repr(C)]
-pub struct AmfGuid {
-    pub data1: u32,
-    pub data2: u16,
-    pub data3: u16,
-    pub data4: [u8; 8],
-}
-
-/// `IID_AMFBuffer` (core/Buffer.h `AMF_DECLARE_IID`) — for `QueryInterface` on the encoder's
-/// output `AMFData` to reach `GetNative`/`GetSize`.
-pub const IID_AMF_BUFFER: AmfGuid = AmfGuid {
-    data1: 0xb04b_7248,
-    data2: 0xb6f0,
-    data3: 0x4321,
-    data4: [0xb6, 0x91, 0xba, 0xa4, 0x74, 0x0f, 0x9f, 0xcb],
-};
-
-// `AMF_VARIANT_TYPE` (core/Variant.h) — the tags this module writes/reads.
-pub const AMF_VARIANT_BOOL: i32 = 1;
-pub const AMF_VARIANT_INT64: i32 = 2;
-pub const AMF_VARIANT_RATE: i32 = 7;
-pub const AMF_VARIANT_INTERFACE: i32 = 12;
-
-/// `AMFVariantStruct` (core/Variant.h): a 4-byte C-enum tag + a 16-byte union whose largest
-/// members are pointer/`amf_int64`/`AMFFloatVector4D` (align 8) → 24 bytes total, tag at 0,
-/// payload at 8. Passed BY VALUE to `SetProperty` (Win64 passes >8-byte aggregates by hidden
-/// reference on both sides, so declaring it by value matches the C compiler). The payload is
-/// stored as two fully-initialised `u64`s — little-endian packing puts a bool in byte 0, an
-/// `amf_int64` in word 0, and an `AMFRate{num,den}` as `num | den << 32`, exactly the union's
-/// in-memory layout — so no partially-initialised union bytes ever cross the FFI.
-#[repr(C)]
-pub struct AmfVariant {
-    pub vtype: i32,
-    pub payload: [u64; 2],
-}
-
-impl AmfVariant {
-    pub fn zeroed() -> Self {
-        AmfVariant {
-            vtype: 0, // AMF_VARIANT_EMPTY
-            payload: [0, 0],
-        }
-    }
-    pub fn from_i64(v: i64) -> Self {
-        AmfVariant {
-            vtype: AMF_VARIANT_INT64,
-            payload: [v as u64, 0],
-        }
-    }
-    pub fn from_bool(v: bool) -> Self {
-        AmfVariant {
-            vtype: AMF_VARIANT_BOOL,
-            payload: [v as u64, 0],
-        }
-    }
-    /// `AMFRate { num, den }` — two little-endian `amf_uint32`s in the union's first 8 bytes.
-    pub fn from_rate(num: u32, den: u32) -> Self {
-        AmfVariant {
-            vtype: AMF_VARIANT_RATE,
-            payload: [num as u64 | ((den as u64) << 32), 0],
-        }
-    }
-    /// An `AMFInterface*` payload (`pInterface` in the union's first 8 bytes). The property
-    /// storage AddRefs the interface when it copies the variant in (the C++ template
-    /// `SetProperty(name, AMFVariant(value))` passes a temporary whose destructor releases,
-    /// so `SetProperty` must take its own reference) — the caller keeps sole ownership of the
-    /// reference it already holds.
-    pub fn from_interface(p: *mut c_void) -> Self {
-        AmfVariant {
-            vtype: AMF_VARIANT_INTERFACE,
-            payload: [p as usize as u64, 0],
-        }
-    }
-    /// Read back an `amf_int64` payload (only valid when `vtype == AMF_VARIANT_INT64`).
-    pub fn as_i64(&self) -> Option<i64> {
-        (self.vtype == AMF_VARIANT_INT64).then_some(self.payload[0] as i64)
-    }
-}
-
-/// Placeholder for a vtable slot this module never calls — same size/align as the function
-/// pointer it stands in for, present only to keep the following slots at their C offsets.
-pub type Slot = *const c_void;
-
-// -- AMFFactory (core/Factory.h; NOT refcounted — a process singleton) ----------------------
-#[repr(C)]
-pub struct AmfFactory {
-    pub vtbl: *const AmfFactoryVtbl,
-}
-#[repr(C)]
-pub struct AmfFactoryVtbl {
-    pub create_context:
-        unsafe extern "system" fn(*mut AmfFactory, *mut *mut AmfContext) -> AmfResult,
-    pub create_component: unsafe extern "system" fn(
-        *mut AmfFactory,
-        *mut AmfContext,
-        *const u16,
-        *mut *mut AmfComponent,
-    ) -> AmfResult,
-    pub set_cache_folder: Slot,
-    pub get_cache_folder: Slot,
-    pub get_debug: Slot,
-    pub get_trace: Slot,
-    pub get_programs: Slot,
-}
-
-// -- AMFContext (core/Context.h) ------------------------------------------------------------
-#[repr(C)]
-pub struct AmfContext {
-    pub vtbl: *const AmfContextVtbl,
-}
-#[repr(C)]
-pub struct AmfContextVtbl {
-    // AMFInterface
-    pub acquire: Slot,
-    pub release: unsafe extern "system" fn(*mut AmfContext) -> i32,
-    pub query_interface: Slot,
-    // AMFPropertyStorage
-    pub set_property: Slot,
-    pub get_property: Slot,
-    pub has_property: Slot,
-    pub get_property_count: Slot,
-    pub get_property_at: Slot,
-    pub clear: Slot,
-    pub add_to: Slot,
-    pub copy_to: Slot,
-    pub add_observer: Slot,
-    pub remove_observer: Slot,
-    // AMFContext
-    pub terminate: unsafe extern "system" fn(*mut AmfContext) -> AmfResult,
-    pub init_dx9: Slot,
-    pub get_dx9_device: Slot,
-    pub lock_dx9: Slot,
-    pub unlock_dx9: Slot,
-    pub init_dx11: unsafe extern "system" fn(*mut AmfContext, *mut c_void, i32) -> AmfResult,
-    pub get_dx11_device: Slot,
-    pub lock_dx11: Slot,
-    pub unlock_dx11: Slot,
-    pub init_opencl: Slot,
-    pub get_opencl_context: Slot,
-    pub get_opencl_command_queue: Slot,
-    pub get_opencl_device_id: Slot,
-    pub get_opencl_compute_factory: Slot,
-    pub init_opencl_ex: Slot,
-    pub lock_opencl: Slot,
-    pub unlock_opencl: Slot,
-    pub init_opengl: Slot,
-    pub get_opengl_context: Slot,
-    pub get_opengl_drawable: Slot,
-    pub lock_opengl: Slot,
-    pub unlock_opengl: Slot,
-    pub init_xv: Slot,
-    pub get_xv_device: Slot,
-    pub lock_xv: Slot,
-    pub unlock_xv: Slot,
-    pub init_gralloc: Slot,
-    pub get_gralloc_device: Slot,
-    pub lock_gralloc: Slot,
-    pub unlock_gralloc: Slot,
-    pub alloc_buffer: unsafe extern "system" fn(
-        *mut AmfContext,
-        i32, // AMF_MEMORY_TYPE
-        usize,
-        *mut *mut AmfBuffer,
-    ) -> AmfResult,
-    pub alloc_surface: Slot,
-    pub alloc_audio_buffer: Slot,
-    pub create_buffer_from_host_native: Slot,
-    pub create_surface_from_host_native: Slot,
-    pub create_surface_from_dx9_native: Slot,
-    /// Out-param is `AMFSurface**` in the header; declared as the `AmfData` base here because
-    /// every surface call this module makes (`SetPts`, `SetProperty`, `Release`,
-    /// `SubmitInput`) lives in the `AMFData` vtable prefix, which `AMFSurfaceVtbl` reproduces
-    /// slot-for-slot (single inheritance, same object pointer).
-    pub create_surface_from_dx11_native: unsafe extern "system" fn(
-        *mut AmfContext,
-        *mut c_void,
-        *mut *mut AmfData,
-        *mut c_void,
-    ) -> AmfResult,
-    pub create_surface_from_opengl_native: Slot,
-    pub create_surface_from_gralloc_native: Slot,
-    pub create_surface_from_opencl_native: Slot,
-    pub create_buffer_from_opencl_native: Slot,
-    pub get_compute: Slot,
-}
-
-// -- AMFComponent (components/Component.h) --------------------------------------------------
-#[repr(C)]
-pub struct AmfComponent {
-    pub vtbl: *const AmfComponentVtbl,
-}
-#[repr(C)]
-pub struct AmfComponentVtbl {
-    // AMFInterface
-    pub acquire: Slot,
-    pub release: unsafe extern "system" fn(*mut AmfComponent) -> i32,
-    pub query_interface: Slot,
-    // AMFPropertyStorage
-    pub set_property:
-        unsafe extern "system" fn(*mut AmfComponent, *const u16, AmfVariant) -> AmfResult,
-    pub get_property: Slot,
-    pub has_property: Slot,
-    pub get_property_count: Slot,
-    pub get_property_at: Slot,
-    pub clear: Slot,
-    pub add_to: Slot,
-    pub copy_to: Slot,
-    pub add_observer: Slot,
-    pub remove_observer: Slot,
-    // AMFPropertyStorageEx
-    pub get_properties_info_count: Slot,
-    pub get_property_info_at: Slot,
-    pub get_property_info: Slot,
-    pub validate_property: Slot,
-    // AMFComponent
-    pub init: unsafe extern "system" fn(*mut AmfComponent, i32, i32, i32) -> AmfResult,
-    pub reinit: Slot,
-    pub terminate: unsafe extern "system" fn(*mut AmfComponent) -> AmfResult,
-    pub drain: unsafe extern "system" fn(*mut AmfComponent) -> AmfResult,
-    pub flush: unsafe extern "system" fn(*mut AmfComponent) -> AmfResult,
-    pub submit_input: unsafe extern "system" fn(*mut AmfComponent, *mut AmfData) -> AmfResult,
-    pub query_output: unsafe extern "system" fn(*mut AmfComponent, *mut *mut AmfData) -> AmfResult,
-    pub get_context: Slot,
-    pub set_output_data_allocator_cb: Slot,
-    pub get_caps: Slot,
-    pub optimize: Slot,
-}
-
-// -- AMFData (core/Data.h) — also the usable prefix of AMFSurface --------------------------
-#[repr(C)]
-pub struct AmfData {
-    pub vtbl: *const AmfDataVtbl,
-}
-#[repr(C)]
-pub struct AmfDataVtbl {
-    // AMFInterface
-    pub acquire: Slot,
-    pub release: unsafe extern "system" fn(*mut AmfData) -> i32,
-    pub query_interface:
-        unsafe extern "system" fn(*mut AmfData, *const AmfGuid, *mut *mut c_void) -> AmfResult,
-    // AMFPropertyStorage
-    pub set_property: unsafe extern "system" fn(*mut AmfData, *const u16, AmfVariant) -> AmfResult,
-    pub get_property:
-        unsafe extern "system" fn(*mut AmfData, *const u16, *mut AmfVariant) -> AmfResult,
-    pub has_property: Slot,
-    pub get_property_count: Slot,
-    pub get_property_at: Slot,
-    pub clear: Slot,
-    pub add_to: Slot,
-    pub copy_to: Slot,
-    pub add_observer: Slot,
-    pub remove_observer: Slot,
-    // AMFData
-    pub get_memory_type: Slot,
-    pub duplicate: Slot,
-    pub convert: Slot,
-    pub interop: Slot,
-    pub get_data_type: Slot,
-    pub is_reusable: Slot,
-    pub set_pts: unsafe extern "system" fn(*mut AmfData, i64),
-    pub get_pts: Slot,
-    pub set_duration: Slot,
-    pub get_duration: Slot,
-}
-
-// -- AMFBuffer (core/Buffer.h) — the encoder's output object -------------------------------
-#[repr(C)]
-pub struct AmfBuffer {
-    pub vtbl: *const AmfBufferVtbl,
-}
-#[repr(C)]
-pub struct AmfBufferVtbl {
-    // AMFInterface + AMFPropertyStorage + AMFData prefix (identical order to AmfDataVtbl).
-    pub acquire: Slot,
-    pub release: unsafe extern "system" fn(*mut AmfBuffer) -> i32,
-    pub query_interface: Slot,
-    pub set_property: Slot,
-    pub get_property: Slot,
-    pub has_property: Slot,
-    pub get_property_count: Slot,
-    pub get_property_at: Slot,
-    pub clear: Slot,
-    pub add_to: Slot,
-    pub copy_to: Slot,
-    pub add_observer: Slot,
-    pub remove_observer: Slot,
-    pub get_memory_type: Slot,
-    pub duplicate: Slot,
-    pub convert: Slot,
-    pub interop: Slot,
-    pub get_data_type: Slot,
-    pub is_reusable: Slot,
-    pub set_pts: Slot,
-    pub get_pts: Slot,
-    pub set_duration: Slot,
-    pub get_duration: Slot,
-    // AMFBuffer
-    pub set_size: Slot,
-    pub get_size: unsafe extern "system" fn(*mut AmfBuffer) -> usize,
-    pub get_native: unsafe extern "system" fn(*mut AmfBuffer) -> *mut c_void,
-    pub add_observer_buffer: Slot,
-    pub remove_observer_buffer: Slot,
-}
-
-// -- DLL entry points (core/Factory.h; AMF_CDECL_CALL) --------------------------------------
-pub type AmfQueryVersionFn = unsafe extern "C" fn(*mut u64) -> AmfResult;
-pub type AmfInitFn = unsafe extern "C" fn(u64, *mut *mut AmfFactory) -> AmfResult;
@@ -95,13 +95,6 @@ struct AVD3D11VAFramesContext {
 /// AMD AMF vs Intel QSV — the two libavcodec vendor backends this module covers.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum WinVendor {
-    /// Benchmark-only, as the module header explains: native AMF replaced the libavcodec AMF path
-    /// in production, and the only remaining CONSTRUCTOR is the `#[cfg(feature = "amf-qsv")]`
-    /// latency A/B in `amf.rs` — the measurement that justifies the native backend existing. That
-    /// is test code, so the *lib* target constructs it nowhere and `dead_code` fires on it (the
-    /// crate root no longer blanket-allows that). Kept deliberately rather than deleted; the arms
-    /// below are what the benchmark drives.
-    #[allow(dead_code)]
    Amf,
    Qsv,
 }
@@ -129,56 +122,9 @@ impl WinVendor {
 /// open-failure fallback only catches *setup* errors; a derive that opens but maps wrong would
 /// corrupt silently, so it stays opt-in per the probe-never-assume rule).
 fn zerocopy_enabled(vendor: WinVendor) -> bool {
-    zerocopy_active(pf_host_config::config().zerocopy, vendor)
-}
-
-/// The pure half of [`zerocopy_enabled`]: an operator override wins; unset resolves to the
-/// per-vendor default (AMF on, QSV off — see the validation status above).
-fn zerocopy_active(override_: Option<bool>, vendor: WinVendor) -> bool {
-    override_.unwrap_or(matches!(vendor, WinVendor::Amf))
-}
-
-/// Upper bound on `PUNKTFUNK_FFWIN_POLL_MS`. This knob spins the **encode thread** waiting for an
-/// AU, so a value past one frame period is already self-defeating and a full second is far beyond
-/// anything an operator would set on purpose. The clamp is also what makes the µs conversion
-/// below provably overflow-free.
-///
-/// The reachable hazard is a slipped digit, not the overflow: pre-clamp, `PUNKTFUNK_FFWIN_POLL_MS=
-/// 100000000` was a **27.7-hour** spin with no overflow anywhere near it.
-const MAX_POLL_SPIN_MS: u64 = 1_000;
-
-/// Bounded post-submit spin for [`FfmpegWinEncoder::poll`], in microseconds (0 = off, the default
-/// and the correct choice on every VCN measured so far).
-///
-/// Read from the environment **once per process** (WP6.1): `poll` runs once per encode tick, and
-/// this was an unconditional `env::var` + parse on it.
-///
-/// ⚠ The audit proposed `saturating_mul` for the µs conversion. It is still the wrong fix, but for
-/// a reason worth stating precisely, because the obvious one is false: `Duration::from_micros(
-/// u64::MAX)` is only ~1.8e13 seconds, six orders of magnitude below `Duration`'s `u64::MAX`-second
-/// ceiling, so `Instant::now() + Duration::from_micros(u64::MAX)` does **not** overflow and does
-/// **not** panic (measured, both with and without debug assertions). What it does instead is set a
-/// deadline ~584,000 years out, and the loop below only exits on `Packet`/`Eof` — and this
-/// function's own doc explains that a spin here *provably never* produces the owed AU on the
-/// measured hardware. So `saturating_mul` converts a bad value into a **permanently wedged encode
-/// thread**: a hang, not a panic. Clamping the parsed value first removes the bad value entirely.
-///
-/// (For the record on the pre-clamp behaviour: the workspace sets no `overflow-checks` in
-/// `[profile.release]`, so `ms * 1000` wrapped silently in release and panicked only in debug.)
-fn poll_spin_cap_us() -> u64 {
-    static CAP_US: std::sync::OnceLock<u64> = std::sync::OnceLock::new();
-    *CAP_US.get_or_init(|| {
-        parse_poll_spin_cap_us(std::env::var("PUNKTFUNK_FFWIN_POLL_MS").ok().as_deref())
-    })
-}
-
-/// The pure half of [`poll_spin_cap_us`]: parse, clamp to [`MAX_POLL_SPIN_MS`] BEFORE the µs
-/// conversion (the ordering the doc above proves is load-bearing), and default to 0 — no spin,
-/// the libavcodec AMF buffer can't be spun out.
-fn parse_poll_spin_cap_us(raw: Option<&str>) -> u64 {
-    raw.and_then(|s| s.trim().parse::<u64>().ok())
-        .map(|ms| ms.min(MAX_POLL_SPIN_MS) * 1000)
-        .unwrap_or(0)
+    pf_host_config::config()
+        .zerocopy
+        .unwrap_or(matches!(vendor, WinVendor::Amf))
 }

 /// The swscale *source* pixel format for a captured packed-RGB/BGR layout (8-bit BGRA fallback only).
@@ -205,94 +151,8 @@ fn sws_src(format: PixelFormat) -> Result<Pixel> {
 }

 /// Does this captured format imply a 10-bit encode (P010 / Rgb10a2)?
-///
-/// Depth follows the PIXELS, not the negotiated `bit_depth` — see
-/// [`crate::ten_bit_input`] for why, and for the failure this shape used to produce here in
-/// particular: a 10-bit-negotiated session over an 8-bit capture built a P010 encoder whose every
-/// `submit_d3d11` then failed the depth check below, forever, with `reset()` unable to help
-/// because the rebuild re-derived the same wrong answer.
-fn is_10bit_format(format: PixelFormat) -> bool {
-    matches!(format, PixelFormat::P010 | PixelFormat::Rgb10a2)
-}
-
-/// Which lane the system-memory path routes a captured D3D11 format through. Device-free — the
-/// routing DECISION, split from the D3D11 copies so it is testable.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum ReadbackRoute {
-    /// Same-format `CopyResource` + plane-by-plane copy (NV12/P010 from the video processor).
-    Yuv,
-    /// BGRA staging + swscale BGRA→NV12 — the 8-bit fallback when the capturer's video
-    /// processor latched off.
-    Bgra,
-    /// R10G10B10A2 staging + swscale X2BGR10→P010 — the HDR twin of that fallback.
-    Rgb10,
-}
-
-/// Route a captured format, guarding the mid-stream depth change first: the predicate matches
-/// what the encoder was built from (`ten_bit_input`), so the guard can only fire on a GENUINE
-/// depth change under the encoder — never, as it used to, on every frame of a session that
-/// merely negotiated 10-bit over an 8-bit capture (see [`is_10bit_format`]).
-fn readback_route(format: PixelFormat, ten_bit: bool) -> Result<ReadbackRoute> {
-    anyhow::ensure!(
-        is_10bit_format(format) == ten_bit,
-        "captured format {format:?} bit-depth changed under the encoder (built {}-bit)",
-        if ten_bit { 10 } else { 8 }
-    );
-    Ok(match format {
-        PixelFormat::Nv12 | PixelFormat::P010 => ReadbackRoute::Yuv,
-        PixelFormat::Bgra | PixelFormat::Bgrx => ReadbackRoute::Bgra,
-        PixelFormat::Rgb10a2 => ReadbackRoute::Rgb10,
-        other => {
-            bail!("ffmpeg_win system path cannot read back captured D3D11 format {other:?}")
-        }
-    })
-}
-
-/// The vendor-specific low-latency option set for [`open_win_encoder`], pure so the latency
-/// contract is pinned by tests. Unknown private options are ignored by `avcodec_open2` (left in
-/// the dict), so vendor/codec-specific keys are safe to set unconditionally.
-fn vendor_opts(vendor: WinVendor, amf_usage: &str) -> Vec<(&'static str, String)> {
-    match vendor {
-        WinVendor::Amf => vec![
-            // Field-tuning override (ultralowlatency | lowlatency | lowlatency_high_quality |
-            // transcoding): AMF usage presets bundle driver-side pipeline behavior that varies
-            // by VCN generation/driver — measured on-box rather than assumed.
-            ("usage", amf_usage.to_owned()),
-            ("rc", "cbr".into()),
-            // Streaming is latency-first: `speed` trims per-frame motion-estimation depth — the
-            // difference between ~encode-time and ~frame-budget on iGPU-class VCN (matches the
-            // low-latency preset choice on the NVENC path).
-            ("quality", "speed".into()),
-            ("preanalysis", "false".into()),
-            ("enforce_hrd", "true".into()),
-            // AMF low-latency submission mode (FFmpeg ≥ 6.1; unknown-option-ignored on older).
-            ("latency", "true".into()),
-            // Never B-frames: h264_amf defaults >0 on RDNA3+ HW that supports them, and each
-            // B-frame is a full frame period of added latency. (HEVC VCN has none; ignored there.)
-            ("bf", "0".into()),
-            // VPS/SPS/PPS on each IDR (clean mid-stream join) — HEVC/AV1 only; ignored elsewhere.
-            ("header_insertion_mode", "idr".into()),
-        ],
-        WinVendor::Qsv => vec![
-            ("preset", "veryfast".into()),
-            ("async_depth", "1".into()), // bound in-flight frames — the big QSV latency lever
-            ("low_power", "1".into()),   // VDEnc fixed-function path (lower latency)
-            ("look_ahead", "0".into()),  // (h264_qsv only; ignored on hevc/av1)
-            ("forced_idr", "1".into()),  // a forced key frame becomes a real IDR
-            ("scenario", "displayremoting".into()),
-        ],
-    }
-}
-
-/// Bind flags on the FFmpeg-allocated zero-copy pool. AMF reads it as encoder input
-/// (RENDER_TARGET + SHADER_RESOURCE, matching the video-processor output); QSV maps it as an mfx
-/// surface (DECODER | VIDEO_ENCODER). The `CopySubresourceRegion` into the pool works with any
-/// usable DEFAULT-usage texture regardless.
-fn pool_bind_flags(vendor: WinVendor) -> u32 {
-    match vendor {
-        WinVendor::Amf => (D3D11_BIND_RENDER_TARGET.0 | D3D11_BIND_SHADER_RESOURCE.0) as u32,
-        WinVendor::Qsv => (D3D11_BIND_DECODER.0 | D3D11_BIND_VIDEO_ENCODER.0) as u32,
-    }
+fn is_10bit_format(format: PixelFormat, bit_depth: u8) -> bool {
+    bit_depth >= 10 || matches!(format, PixelFormat::P010 | PixelFormat::Rgb10a2)
 }

 /// Build the FFmpeg encoder context shared by both inner paths: name, mode, low-latency RC,
@@ -355,11 +215,40 @@ unsafe fn open_win_encoder(
        (*raw).hw_frames_ctx = ffi::av_buffer_ref(frames_ref);
    }

-    // Low-latency tuning — the per-vendor contract lives in `vendor_opts` (pure, test-pinned).
+    // Low-latency tuning. Unknown private options are ignored by avcodec_open2 (left in the dict),
+    // so vendor-specific keys are safe to set unconditionally.
    let mut opts = Dictionary::new();
-    let usage = std::env::var("PUNKTFUNK_AMF_USAGE").unwrap_or_else(|_| "ultralowlatency".into());
-    for (k, v) in vendor_opts(vendor, &usage) {
-        opts.set(k, &v);
+    match vendor {
+        WinVendor::Amf => {
+            // Field-tuning override (ultralowlatency | lowlatency | lowlatency_high_quality |
+            // transcoding): AMF usage presets bundle driver-side pipeline behavior that varies by
+            // VCN generation/driver — measured on-box rather than assumed.
+            let usage =
+                std::env::var("PUNKTFUNK_AMF_USAGE").unwrap_or_else(|_| "ultralowlatency".into());
+            opts.set("usage", &usage);
+            opts.set("rc", "cbr");
+            // Streaming is latency-first: `speed` trims per-frame motion-estimation depth — the
+            // difference between ~encode-time and ~frame-budget on iGPU-class VCN (matches the
+            // low-latency preset choice on the NVENC path).
+            opts.set("quality", "speed");
+            opts.set("preanalysis", "false");
+            opts.set("enforce_hrd", "true");
+            // AMF low-latency submission mode (FFmpeg ≥ 6.1; unknown-option-ignored on older).
+            opts.set("latency", "true");
+            // Never B-frames: h264_amf defaults >0 on RDNA3+ HW that supports them, and each
+            // B-frame is a full frame period of added latency. (HEVC VCN has none; ignored there.)
+            opts.set("bf", "0");
+            // VPS/SPS/PPS on each IDR (clean mid-stream join) — HEVC/AV1 only; ignored elsewhere.
+            opts.set("header_insertion_mode", "idr");
+        }
+        WinVendor::Qsv => {
+            opts.set("preset", "veryfast");
+            opts.set("async_depth", "1"); // bound in-flight frames — the big QSV latency lever
+            opts.set("low_power", "1"); // VDEnc fixed-function path (lower latency)
+            opts.set("look_ahead", "0"); // (h264_qsv only; ignored on hevc/av1)
+            opts.set("forced_idr", "1"); // a forced key frame becomes a real IDR
+            opts.set("scenario", "displayremoting");
+        }
    }
    video
        .open_with(opts)
@@ -382,11 +271,6 @@ pub fn probe_can_encode_444(_vendor: WinVendor, _codec: Codec) -> bool {
    false
 }

-/// Gated to the builds that can actually reach it: `lib.rs`'s only caller sits under
-/// `cfg(all(not(feature = "qsv"), feature = "amf-qsv"))`, because with the native VPL backend
-/// compiled in it is `qsv::probe_can_encode` that answers. So in the SHIPPED Windows combo
-/// (`nvenc,amf-qsv,qsv`) this function has no caller at all.
-#[cfg(not(feature = "qsv"))]
 pub fn probe_can_encode(vendor: WinVendor, codec: Codec) -> bool {
    // Deliberately NOT pinned to the selected render adapter (unlike `nvenc::probe_can_encode_444`):
    // the system-input probe passes no hwdevice, and the AMF/QSV runtimes only ever bind their own
@@ -466,7 +350,7 @@ impl SystemInner {
        bitrate_bps: u64,
        bit_depth: u8,
    ) -> Result<Self> {
-        let ten_bit = crate::ten_bit_input(format, bit_depth);
+        let ten_bit = is_10bit_format(format, bit_depth);
        let sw_av = if ten_bit {
            ffi::AVPixelFormat::AV_PIX_FMT_P010LE
        } else {
@@ -588,10 +472,19 @@ impl SystemInner {
        pts: i64,
        idr: bool,
    ) -> Result<()> {
-        match readback_route(format, self.ten_bit)? {
-            ReadbackRoute::Yuv => self.readback_yuv(frame, pts, idr),
-            ReadbackRoute::Bgra => self.readback_bgra(frame, pts, idr),
-            ReadbackRoute::Rgb10 => self.readback_rgb10(frame, pts, idr),
+        let fmt_10 = matches!(format, PixelFormat::P010 | PixelFormat::Rgb10a2);
+        anyhow::ensure!(
+            fmt_10 == self.ten_bit,
+            "captured format {format:?} bit-depth changed under the encoder (built {}-bit)",
+            if self.ten_bit { 10 } else { 8 }
+        );
+        match format {
+            PixelFormat::Nv12 | PixelFormat::P010 => self.readback_yuv(frame, pts, idr),
+            PixelFormat::Bgra | PixelFormat::Bgrx => self.readback_bgra(frame, pts, idr),
+            PixelFormat::Rgb10a2 => self.readback_rgb10(frame, pts, idr),
+            other => {
+                bail!("ffmpeg_win system path cannot read back captured D3D11 format {other:?}")
+            }
        }
    }

@@ -958,7 +851,7 @@ impl ZeroCopyInner {
        bit_depth: u8,
        device: &ID3D11Device,
    ) -> Result<Self> {
-        let ten_bit = crate::ten_bit_input(format, bit_depth);
+        let ten_bit = is_10bit_format(format, bit_depth);
        let sw_av = if ten_bit {
            ffi::AVPixelFormat::AV_PIX_FMT_P010LE
        } else {
@@ -969,7 +862,14 @@ impl ZeroCopyInner {
        } else {
            PixelFormat::Nv12
        };
-        let bind_flags = pool_bind_flags(vendor);
+        // Bind flags on the FFmpeg-allocated pool. AMF reads it as encoder input (RENDER_TARGET +
+        // SHADER_RESOURCE, matching the video-processor output); QSV maps it as an mfx surface
+        // (DECODER | VIDEO_ENCODER). The CopySubresourceRegion into the pool works with any usable
+        // DEFAULT-usage texture regardless.
+        let bind_flags = match vendor {
+            WinVendor::Amf => (D3D11_BIND_RENDER_TARGET.0 | D3D11_BIND_SHADER_RESOURCE.0) as u32,
+            WinVendor::Qsv => (D3D11_BIND_DECODER.0 | D3D11_BIND_VIDEO_ENCODER.0) as u32,
+        };
        const POOL: c_int = 8;
        // SAFETY: `D3d11Hw::new` wraps the capturer's `device` as a D3D11VA hwdevice (handing FFmpeg an
        // owned AddRef of it, balanced by FFmpeg's teardown Release) and builds an owned
@@ -1411,7 +1311,11 @@ impl Encoder for FfmpegWinEncoder {
            Some(Inner::ZeroCopy(z)) => &mut z.enc,
            None => return Ok(None),
        };
-        let cap_us = poll_spin_cap_us();
+        let cap_us = std::env::var("PUNKTFUNK_FFWIN_POLL_MS")
+            .ok()
+            .and_then(|s| s.parse::<u64>().ok())
+            .map(|ms| ms * 1000)
+            .unwrap_or(0); // default: no spin — the libavcodec AMF buffer can't be spun out
        let deadline = (cap_us > 0 && self.in_flight > 0)
            .then(|| std::time::Instant::now() + std::time::Duration::from_micros(cap_us));
        loop {
@@ -1443,193 +1347,3 @@ impl Encoder for FfmpegWinEncoder {
        Ok(())
    }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// Zero-copy default matrix: the operator override wins in both directions; unset resolves
-    /// AMF on (on-glass validated) and QSV off (opt-in until validated on Intel glass — the
-    /// probe-never-assume rule).
-    #[test]
-    fn zerocopy_default_is_per_vendor_and_override_wins() {
-        assert!(zerocopy_active(None, WinVendor::Amf));
-        assert!(!zerocopy_active(None, WinVendor::Qsv));
-        for vendor in [WinVendor::Amf, WinVendor::Qsv] {
-            assert!(zerocopy_active(Some(true), vendor));
-            assert!(!zerocopy_active(Some(false), vendor));
-        }
-    }
-
-    /// `PUNKTFUNK_FFWIN_POLL_MS` grammar: default 0 (no spin), verbatim ms → µs inside the clamp,
-    /// and the clamp applies BEFORE the µs conversion — the slipped-digit value that used to be a
-    /// 27.7-hour spin resolves to the 1 s cap, not a wedged encode thread.
-    #[test]
-    fn poll_spin_cap_clamps_before_the_us_conversion() {
-        assert_eq!(parse_poll_spin_cap_us(None), 0);
-        assert_eq!(parse_poll_spin_cap_us(Some("0")), 0);
-        assert_eq!(parse_poll_spin_cap_us(Some("5")), 5_000);
-        assert_eq!(parse_poll_spin_cap_us(Some(" 12 ")), 12_000);
-        assert_eq!(
-            parse_poll_spin_cap_us(Some("100000000")),
-            MAX_POLL_SPIN_MS * 1000
-        );
-        assert_eq!(
-            parse_poll_spin_cap_us(Some(&u64::MAX.to_string())),
-            MAX_POLL_SPIN_MS * 1000
-        );
-        assert_eq!(parse_poll_spin_cap_us(Some("junk")), 0);
-        assert_eq!(parse_poll_spin_cap_us(Some("-1")), 0);
-    }
-
-    /// The swscale source map: packed RGB/BGR converts; every YUV/10-bit layout is refused (the
-    /// swscale lane is the 8-bit BGRA fallback, not a general converter — the Linux HDR formats
-    /// are listed explicitly so a `PixelFormat` addition re-breaks the match on purpose).
-    #[test]
-    fn sws_src_accepts_packed_rgb_only() {
-        assert_eq!(sws_src(PixelFormat::Bgrx).unwrap(), Pixel::BGRZ);
-        assert_eq!(sws_src(PixelFormat::Rgbx).unwrap(), Pixel::RGBZ);
-        assert_eq!(sws_src(PixelFormat::Bgra).unwrap(), Pixel::BGRA);
-        assert_eq!(sws_src(PixelFormat::Rgba).unwrap(), Pixel::RGBA);
-        assert_eq!(sws_src(PixelFormat::Rgb).unwrap(), Pixel::RGB24);
-        assert_eq!(sws_src(PixelFormat::Bgr).unwrap(), Pixel::BGR24);
-        for f in [
-            PixelFormat::Nv12,
-            PixelFormat::P010,
-            PixelFormat::Rgb10a2,
-            PixelFormat::Yuv444,
-            PixelFormat::X2Rgb10,
-            PixelFormat::X2Bgr10,
-        ] {
-            assert!(sws_src(f).is_err(), "{f:?} must be refused");
-        }
-    }
-
-    /// The readback routing table, and its depth guard: NV12/P010 take the plane copy, the
-    /// video-processor fallbacks take their swscale lanes, a depth CHANGE under the encoder is
-    /// refused (in both directions), and depth-consistent routing never trips the guard.
-    #[test]
-    fn readback_routing_and_depth_guard() {
-        assert_eq!(
-            readback_route(PixelFormat::Nv12, false).unwrap(),
-            ReadbackRoute::Yuv
-        );
-        assert_eq!(
-            readback_route(PixelFormat::P010, true).unwrap(),
-            ReadbackRoute::Yuv
-        );
-        assert_eq!(
-            readback_route(PixelFormat::Bgra, false).unwrap(),
-            ReadbackRoute::Bgra
-        );
-        assert_eq!(
-            readback_route(PixelFormat::Bgrx, false).unwrap(),
-            ReadbackRoute::Bgra
-        );
-        assert_eq!(
-            readback_route(PixelFormat::Rgb10a2, true).unwrap(),
-            ReadbackRoute::Rgb10
-        );
-        // Mid-stream depth changes — the genuine error the guard exists for.
-        assert!(readback_route(PixelFormat::P010, false).is_err());
-        assert!(readback_route(PixelFormat::Rgb10a2, false).is_err());
-        assert!(readback_route(PixelFormat::Nv12, true).is_err());
-        assert!(readback_route(PixelFormat::Bgra, true).is_err());
-        // A format neither lane can read back.
-        assert!(readback_route(PixelFormat::Yuv444, false).is_err());
-    }
-
-    /// The 10-bit predicate follows the PIXELS (P010/Rgb10a2), not the negotiated depth — see
-    /// `ten_bit_input` for the forever-failing-session shape the reverse produced here.
-    #[test]
-    fn ten_bit_follows_the_pixels() {
-        assert!(is_10bit_format(PixelFormat::P010));
-        assert!(is_10bit_format(PixelFormat::Rgb10a2));
-        assert!(!is_10bit_format(PixelFormat::Nv12));
-        assert!(!is_10bit_format(PixelFormat::Bgra));
-        assert!(!is_10bit_format(PixelFormat::Bgrx));
-    }
-
-    /// The QSV low-latency contract, pinned: these five knobs are the difference between
-    /// display-remoting latency and transcode behavior — a silent regression here changes every
-    /// Intel Windows session.
-    #[test]
-    fn qsv_opts_pin_the_latency_contract() {
-        let opts = vendor_opts(WinVendor::Qsv, "ignored");
-        let get = |k: &str| {
-            opts.iter()
-                .find(|(key, _)| *key == k)
-                .map(|(_, v)| v.as_str())
-        };
-        assert_eq!(get("async_depth"), Some("1"));
-        assert_eq!(get("low_power"), Some("1"));
-        assert_eq!(get("look_ahead"), Some("0"));
-        assert_eq!(get("forced_idr"), Some("1"));
-        assert_eq!(get("scenario"), Some("displayremoting"));
-        assert_eq!(get("preset"), Some("veryfast"));
-        assert_eq!(get("usage"), None, "AMF-only knob must not leak into QSV");
-    }
-
-    /// The AMF (benchmark-comparator) contract: usage passes through, B-frames are pinned OFF
-    /// (each one is a full frame period of latency on RDNA3+), and the low-latency submission
-    /// mode + IDR header insertion are requested.
-    #[test]
-    fn amf_opts_pin_no_bframes_and_the_usage_passthrough() {
-        let opts = vendor_opts(WinVendor::Amf, "lowlatency");
-        let get = |k: &str| {
-            opts.iter()
-                .find(|(key, _)| *key == k)
-                .map(|(_, v)| v.as_str())
-        };
-        assert_eq!(get("usage"), Some("lowlatency"));
-        assert_eq!(get("bf"), Some("0"));
-        assert_eq!(get("rc"), Some("cbr"));
-        assert_eq!(get("quality"), Some("speed"));
-        assert_eq!(get("latency"), Some("true"));
-        assert_eq!(get("header_insertion_mode"), Some("idr"));
-        assert_eq!(get("preanalysis"), Some("false"));
-        assert_eq!(get("enforce_hrd"), Some("true"));
-    }
-
-    /// The zero-copy pool's bind flags per vendor — AMF's encoder-input shape vs QSV's mfx
-    /// surface shape (a wrong flag set fails `av_hwframe_ctx_init`, or worse, opens and maps
-    /// wrong).
-    #[test]
-    fn pool_bind_flags_per_vendor() {
-        assert_eq!(
-            pool_bind_flags(WinVendor::Amf),
-            (D3D11_BIND_RENDER_TARGET.0 | D3D11_BIND_SHADER_RESOURCE.0) as u32
-        );
-        assert_eq!(
-            pool_bind_flags(WinVendor::Qsv),
-            (D3D11_BIND_DECODER.0 | D3D11_BIND_VIDEO_ENCODER.0) as u32
-        );
-    }
-
-    /// The libavcodec encoder-name dispatch (name-selected — the codec id would pick the
-    /// software encoder).
-    #[test]
-    fn encoder_names_dispatch_by_vendor() {
-        assert_eq!(WinVendor::Qsv.encoder_name(Codec::H264), "h264_qsv");
-        assert_eq!(WinVendor::Qsv.encoder_name(Codec::H265), "hevc_qsv");
-        assert_eq!(WinVendor::Qsv.encoder_name(Codec::Av1), "av1_qsv");
-        assert_eq!(WinVendor::Amf.encoder_name(Codec::H265), "hevc_amf");
-    }
-
-    /// Probe smoke: resolve the QSV probe on this machine without crashing — `false` on a box
-    /// without the Intel runtime is a valid outcome; the value is printed, not asserted. Only
-    /// compiled in the `amf-qsv`-without-`qsv` combo (the shipped combo answers via native VPL).
-    /// Run on the Windows CI runner:
-    ///   cargo test -p pf-encode --no-default-features --features amf-qsv -- --ignored ffmpeg_win
-    #[cfg(not(feature = "qsv"))]
-    #[test]
-    #[ignore = "needs a real FFmpeg runtime probe (run on the Windows CI runner, not a dev box)"]
-    fn ffmpeg_win_probe_smoke() {
-        for codec in [Codec::H264, Codec::H265, Codec::Av1] {
-            eprintln!(
-                "probe_can_encode(Qsv, {codec:?}) = {}",
-                probe_can_encode(WinVendor::Qsv, codec)
-            );
-        }
-    }
-}
--- a/Show More
+++ b/Show More