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Fix #1016: prepare selected sources within the Program deadline - #1018
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Owner ruling 2026-10-22. Program/ISO/OS-camera/stream per-frame identity over the 30-minute workload is the release gate, zero tolerance. The on-screen Studio cells are DWM-composed windowed surfaces; on a mixed-refresh desk Windows omits a frame at the monitor-clock beat for every application (the app-less control reproduced it with the media core stopped), so a zero-omission desktop check cannot pass a soak and no longer blocks. desktop-picture-cadence.py v2 reports the cells against: longest hold <= 100 ms, omission ratio <= 1 %, no torn/reordered pictures. Replayed on retained evidence: qualification-1008-21 (Present(1)) is within tolerance at 0.41 % / 39.8 ms; qualification-1008-22 (Present(0)) still fails at 13.8 %. Twelve regression tests. CLAUDE.md, the delivery audit and the backlog record the ruling and the retired investigations. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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October 23, 2026 00:10
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Fix #1016: Program could commit an older source image even when the selected image completed preparation before the original output deadline. Reserve one existing Program pool credit for the immutable source/Take choice and compose it on the next production tick, retaining the original slot, deadline, two-frame latency and bounded capacity. Exact-source failures remain failures. The first real consumer is the buffered D3D11 Program compositor.
This also addresses qualification blocker #1017:
shared_ptr::use_count()was being used as the snapshot pool's reuse handoff. Explicit reader lease retirement now supplies the acquire/release synchronization while retaining the fixed pool and nonblocking refusal under reader pressure.Validation so far: the initial prototype passed all 1,841 Windows Release native tests with real capture enabled, including causal older-picture controls and cancellation/expiration cases. That run preceded the final shipping-default switch, picture-probe additions and snapshot lease fix, so it is not final-head acceptance. Five picture-judge fixtures pass, including advancing Program counters with stale camera pictures, a frozen screen and a frozen ordinary camera image. The combined 91b9fb0 build subsequently passed all 1,844 Windows Release native tests with real capture enabled, all 55 compiled UI checks, and the bundled runtime probe. The hosted ThreadSanitizer job also passed. Installed workload remains pending.
The independent registered OS camera receiver can now sample declared picture coordinates. Camera identity bands are painted in captured pixels before GPU preparation, separately from Program output markers; an independently logged desktop stimulus exercises moving screen capture. Actual recorded/received source pictures, source cadence, original GPU deadlines, Program plus eight Zoom ISO recordings, and mapped 60 Hz physical display delivery must all be checked.
Draft includes the #1008 changes plus these qualification fixes. It targets main to exercise the required CI workflows; do not merge either PR or publish a beta until the installed full-workload gate passes. See
docs/qa/source-composition-deadline-2026-10-21.mdfor retained evidence and scope. No full-workload pass is claimed.