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feat(core+host+driver+client): mid-stream cursor-render flip — host composites in the capture model

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The cursor channel excluded the host pointer from the video for the
whole session, but the client only draws it under the DESKTOP mouse
model — flipping ⌃⌥⇧M to capture mid-stream left the session
pointer-blind (user-found). The fix makes render ownership LIVE state:

- wire: CursorRenderMode 0x51 (client→host, control stream) —
  client_draws: true = desktop model (host excludes + forwards),
  false = capture model / released (host composites, full fidelity —
  DWM on Windows incl. real XOR inversion, encoder blend on Linux).
  Sessions start client_draws=true (the pre-message behavior).
- host: control task stores the flag; the encode loop edge-detects it —
  forwarding + frame.cursor strip while the client draws, quiet
  forwarder + overlay-into-blend while composited. SessionPlan now
  grants blend CAPABILITY wherever the capture has a pointer (dropping
  the !cursor_forward gate) so the composite side needs no encoder
  rebuild; per-tick frame.cursor decides what is drawn.
- Windows: Capturer::set_cursor_forward → retained
  IOCTL_SET_CURSOR_FORWARD sender (proto v6) → driver (un)declares the
  IddCx hardware cursor on the LIVE monitor. Un-declare re-issues the
  setup with EMPTY caps (candidate mechanism — the DDI has no
  documented un-setup); resetup-on-commit is skipped while off, so a
  mode commit's software-cursor default is the fallback path. Failure
  against a pre-v6 driver logs and keeps declared-at-ADD behavior.
- SDL client: one edge-detected reconciler at the cursor pump site —
  desktop-active = client draws; capture model or released = host
  composites. Covers the chord, the M3 auto-flip, and engage/release.
- C ABI v12: punktfunk_connection_set_cursor_render (additive; wire
  version unchanged — pre-§8 hosts ignore the unknown message type).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
enricobuehler
2026-07-22 23:43:23 +02:00
co-authored by Claude Opus 4.8
parent 0420be9fa5
commit 92761813a9
16 changed files with 361 additions and 23 deletions
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crates/punktfunk-core/src/lib.rs
+5 -1
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@@ -102,7 +102,11 @@ pub use stats::Stats;
/// v10: added `punktfunk_connection_clock_offset_now_ns` — the LIVE (mid-stream re-synced)
/// clock offset ongoing latency math must use; the connect-time getter stays frozen by
/// contract. Additive, client-local — no wire change, so [`WIRE_VERSION`] is unchanged.
pub const ABI_VERSION: u32 = 11;
/// v12: added `punktfunk_connection_set_cursor_render` — the mid-stream cursor-render flip
/// (design/remote-desktop-sweep.md §8): the client's mouse-model chord tells the host who
/// renders the pointer. Additive; rides the existing control stream (a new message TYPE, which
/// pre-§8 hosts ignore), so [`WIRE_VERSION`] is unchanged.
pub const ABI_VERSION: u32 = 12;
/// The punktfunk/1 **wire** version — what `Hello`/`Welcome` carry and hosts equality-check.
/// Deliberately its own constant: [`ABI_VERSION`] tracks the embeddable **C surface**