Bug 300579

Summary: Construction of VideoFrame from OffscreenCanvas consumes a lot more CPU than construction VideoFrame from from canvas.
Product: WebKit Reporter: Yury Yarashevich <yura.yaroshevich>
Component: CanvasAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: bfulgham, jer.noble, kkinnunen, mattwoodrow, sabouhallawa, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar, Performance
Version: Safari Technology Preview   
Hardware: Mac (Apple Silicon)   
OS: macOS 26   
Attachments:
Description Flags
PR: Cheaper ctor of VideoFrame from OffscreenCanvas. #52197 none

Yury Yarashevich
Reported 2025-10-12 02:59:26 PDT
The demo creates an OffscreenCanvas within a worker and uses it to render a rotating triangle. A VideoTrackGenerator is then used to produce a MediaStreamTrack from the rendered frames by creating VideoFrame objects from the OffscreenCanvas. Demo: https://mstyura.github.io/webkit-issues/video-transform-pipeline/05-triangle-offscreen-video-track-generator/index.html Source html: https://github.com/mstyura/webkit-issues/blob/main/video-transform-pipeline/05-triangle-offscreen-video-track-generator/index.html Source js: https://github.com/mstyura/webkit-issues/blob/main/video-transform-pipeline/05-triangle-offscreen-video-track-generator/worker.js On MBP with MacOS 26.0.1 the STP Release 229 (WebKit 21623.1.9.1) consumes 60% of CPU in GPU process to render demo.
Attachments
PR: Cheaper ctor of VideoFrame from OffscreenCanvas. #52197 (43 bytes, patch)
2025-10-13 12:54 PDT, Yury Yarashevich 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Yury Yarashevich
Comment 1 2025-10-13 12:54:02 PDT
Created attachment 477062 [details] PR: Cheaper ctor of VideoFrame from OffscreenCanvas. #52197
Radar WebKit Bug Importer
Comment 2 2025-10-19 03:00:14 PDT
<rdar://problem/162963198>
Yury Yarashevich
Comment 3 2025-11-05 22:58:36 PST
Pull request: https://github.com/WebKit/WebKit/pull/53510
EWS
Comment 4 2025-11-13 01:27:13 PST
Committed 302974@main (d77809d46e44): <https://commits.webkit.org/302974@main> Reviewed commits have been landed. Closing PR #53510 and removing active labels.
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