design/midstream-resolution-resize.md Phase 0 + Phase 1.
Host (Phase 0):
- H1/H5: per-backend Reconfigure acceptance gate — reject for gamescope
(all sub-modes; a resize must never relaunch the title) and under the
per-client-mode identity policy (a resize would resolve a different
display slot). Synthetic stays reconfigurable on purpose (the protocol
test source; the C-ABI roundtrip test rides it). Plus a 500 ms host-side
min-interval backstop against Reconfigure spam.
- H2: rollback/corrective ack — the data plane reports the mode actually
live after a failed rebuild (or a refresh the backend capped) through a
reconfig_result channel; the control task forwards it as a second
accepted Reconfigured so the client's mode slot self-corrects.
- H3: live stats mode — SendStats reads a packed AtomicU64 (w|h|hz)
updated on every switch instead of latching the session-start mode.
- H4: registry::retire(gen) — a mode-switch rebuild force-releases the
superseded Linux display, so linger/forever keep-alive policies don't
accumulate kept monitors at stale modes. VirtualOutput carries pool_gen
(fresh AND reused) and the Pipeline tuple threads it to the switch arm.
Client (Phase 1, default off):
- Settings: match_window policy + persisted last window size; exposed as
the Resolution tri-state (Native / Match window / explicit) in the Skia
console, GTK and WinUI settings pages.
- pf-presenter: window opens at the persisted size; Hello mode follows the
window's pixel size; D2 trigger discipline (400 ms debounce to
resize-end, ≥1 s spacing, even-floor + ≥320×200 clamp, each distinct
size requested at most once — covers rejects and host rollbacks) as a
pure, unit-tested decision; HUD line + title refresh on a switch.
- Session binary wires both --connect and --browse paths; the WinUI shell
is session-always, so this covers Windows too.
Verified: workspace tests + clippy green; synthetic --remode end-to-end;
live session-binary run (window at persisted 1000×600 → Hello 1000×600@60).
On-glass per-backend matrix (Mutter/KWin/gamescope-reject, keep-alive
accumulation) still pending before any default flip.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
d0d9bd5bfb