enricobuehler
28ab448a29
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The capture-architecture reset from the research: add a Windows.Graphics.Capture (WGC) backend that captures the COMPOSED desktop — including the overlay/independent-flip/MPO planes DXGI Desktop Duplication misses — which structurally fixes the frozen HDR animations + video (proven live: a WGC frame decodes to the real 5120x1440 HDR content DDA freezes on). It reuses the whole pipeline unchanged: the WGC frame's GPU texture → same scRGB→BT.2020-PQ shader → NVENC zero-copy; the OS composites the cursor (IsCursorCaptureEnabled) so no manual cursor pass. crates/punktfunk-host/src/ capture/wgc.rs; find_output/make_device/HdrConverter/nudge_cursor_onto made pub(crate) for reuse. Reliability findings + mitigations (live on the RTX 4090): - WGC can't activate under the SYSTEM account (0x80070424) — it needs the interactive user token. The host must run as the user for WGC (run.cmd: drop PsExec -s). DDA still needs SYSTEM for the secure desktop — that token reconciliation (impersonation) is the remaining task. - WGC's Direct3D11CaptureFramePool::CreateFreeThreaded intermittently HANGS on the headless SudoVDA (IddCx) display, correlated with accumulated SudoVDA churn (failed REMOVEs leaving lingering displays); clean-state opens reliably. Since it's a blocking hang, capture_virtual_output runs WGC open on a watchdog thread with a 5s timeout and falls back to DDA on hang/error — the session is NEVER left black: WGC when it opens (fixed animations), DDA otherwise. First-frame nudge added (WGC fires FrameArrived on change; a static desktop otherwise never delivers the first frame). - Default WGC; PUNKTFUNK_CAPTURE=dda forces DDA. DDA path unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>