NEW 248816
Canvas flickers when combining putImageData and other draw calls 
https://bugs.webkit.org/show_bug.cgi?id=248816
Summary Canvas flickers when combining putImageData and other draw calls
ae
Reported 2022-12-06 06:41:42 PST
I have a Canvas which I update roughly 30 times per second with a putImageData call and a few simple line drawing calls. The line drawing seems to fail intermittently, as the lines flicker.
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Simon Fraser (smfr)
Comment 1 2022-12-06 16:19:20 PST
Can you give us access to a page that reproduces this, or attach a small test case?
ae
Comment 2 2022-12-07 03:09:38 PST
(In reply to Simon Fraser (smfr) from comment #1) > Can you give us access to a page that reproduces this, or attach a small > test case? I'll try to do my best. The problem occurs in a very complex hybrid web app running in a WKWebView with multiple other canvases and a lot going on in general, so it might not be straightforward. I do know that it's not a trivial problem in my code because the same code works in Blink and it's really just a putImageData followed by 3 beginPath/moveTo/lineTo/stroke calls. There's also no other (transparent) layers on top of the canvas so I don't think it's a composting problem. Setting transform:translate3d(0,0,0) on the canvas doesn't help either. I'll try to make a minimal test case when I got time. Thanks.
Radar WebKit Bug Importer
Comment 3 2022-12-13 06:42:16 PST
<rdar://problem/103299941>
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