Bug 237424

Summary:	REGRESSION (Safari 15.3): Drawing video on canvas results in black canvas if GPU Process: Canvas rendering is on
Product:	WebKit	Reporter:	peter.parks.eron
Component:	Canvas	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	dino, jer.noble, jonlee, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 15
Hardware:	Mac (Apple Silicon)
OS:	macOS 12

Description peter.parks.eron 2022-03-03 05:40:04 PST

When video uses Hls stream as a source in Safari, and when I want to draw that video onto the canvas using drawImage(video, 0, 0, w, h) (https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/drawImage), canvas results in a black image.
If I turn off the experimental feature- GPU Process: Canvas Rendering, everything works as expected. And it worked as expected in previous Safari versions.

Comment 1 Radar WebKit Bug Importer 2022-03-04 09:16:40 PST

<rdar://problem/89817412>

Comment 2 peter.parks.eron 2022-03-14 11:13:47 PDT

I guess that it started with the first version that included GPU Process: Canvas Rendering as On by default.

Comment 3 Jer Noble 2022-03-30 14:03:59 PDT

This appears to work correctly now: <https://jernoble.github.io/samples/bin/video-to-canvas/hls.html>

Peter, would you mind testing with a recent STP build?