NEW 267291
Umbrella: Using Canvas image sources between different canvases and canvas types is slow 
https://bugs.webkit.org/show_bug.cgi?id=267291
Summary Umbrella: Using Canvas image sources between different canvases and canvas ty...
Kimmo Kinnunen
Reported 2024-01-09 11:46:33 PST
Umbrella: Using Canvas image sources between different canvases and canvas types is slow - Video - Offscreen canvas - WebGL - 2DContext - Bitmaprenderer
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Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2024-01-12 12:16:34 PST
<rdar://problem/120916864>
Yegor
Comment 2 2024-05-01 09:39:06 PDT
Here's a couple of repro cases: Plain JS repro: https://jsfiddle.net/yjbanov/0vurdt42/8/ Flutter Web repro: https://image-bitmap-stress-test.web.app/ Fixing this will help us make Flutter web apps run much smoother in Safari and consume less memory.
Simon Fraser (smfr)
Comment 3 2024-12-13 10:26:45 PST
https://jsfiddle.net/yjbanov/0vurdt42/8/ seems fast but https://image-bitmap-stress-test.web.app/ is still slower in Safari than Chrome.
Yegor
Comment 4 2024-12-13 12:38:29 PST
This is exciting! We'll kick the tires in the newest Safari. This variant is still drastically slower compared to Chromium-based browsers: https://jsfiddle.net/6e4dz57v/4/
Yegor
Comment 5 2024-12-13 12:38:59 PST
The difference may be in transferToImageBitmap vs createImageBitmap
Yury Yarashevich
Comment 6 2025-06-04 14:10:48 PDT
I'd like to contribute two additional demos that cover scenarios not currently represented in this ticket: 1. The efficiency of `HTMLCanvasElement.captureStream` implementation: https://github.com/mstyura/webkit-issues/blob/main/video-transform-pipeline/README.md#mirror-4k-canvas-to-video-element-via-htmlcanvaselementcapturestream 2. The efficiency of `VideoTrackGenerator` when produce frames via `new VideoFrame(offscreenCanvas)`: https://github.com/mstyura/webkit-issues/blob/main/video-transform-pipeline/README.md#produce-a-mediastreamtrack-via-videotrackgenerator-from-an-offscreencanvas-rendered-in-a-worker
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