ScreenTinker e606cc83d1 Screenshots: prove pixels arrived instead of assuming the draw worked ... A BrightSign emitted BLANK screenshots and logged "Screenshot sent". With hwz enabled the video decodes onto a hardware plane outside the browser compositor — BrightSign's docs say the HTML/JS layer "doesn't see the pixels" — so drawImage(video) produces a fully TRANSPARENT image and throws nothing. Chromium 87, which this XT245 reports, fails the same way. Both capture paths set captured/drawn = true purely because drawMediaFit() had not thrown. So the dashboard showed a dead screen while the panel played perfectly, and the zone path painted a black rectangle in place of the labelled placeholder drawZonePlaceholder() exists to guarantee ("never a transparent hole"). Success reported, nothing done. isMediaReadable() does not catch this. It answers "am I ALLOWED to read this" (same-origin / CORS), which is a different question from "did any pixels arrive". videoFrameIsCapturable() probes a 16x16 scratch canvas before committing to a full-size draw. ALPHA is the discriminator, not colour: a scratch canvas starts transparent and a real decoded frame writes alpha=255 even when the frame is pure black, so a legitimate fade-to-black still reads as captured while "nothing arrived" does not. A tainted canvas counts as captured, because tainting only happens once cross-origin pixels have actually been drawn. Probing BEFORE the draw matters twice: it avoids a wasted full-size drawImage on every frame of a 1fps stream, and in the zone path it stops a black rectangle being painted underneath the placeholder. When a video is on screen but unreadable the status card now says so, because that card is also what shows for "no content" — without the line an operator would reasonably conclude the screen was blank. Not gated on BrightSign: the same silent failure exists for any stalled decoder or engine that declines to hand back frames. 10 tests, 964 pass.		2026-08-05 10:01:03 -05:00
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debug-overlay.js	Add player debug overlay and server-side error telemetry sink	2026-05-15 15:20:42 -05:00
index.html	Screenshots: prove pixels arrived instead of assuming the draw worked	2026-08-05 10:01:03 -05:00
sw.js	Widget edits reach the web and Tizen players too, and a pinned render can be cached offline	2026-07-30 20:09:06 -05:00