[Webkit-unassigned] [Bug 248816] Canvas flickers when combining putImageData and other draw calls

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248816

--- Comment #2 from ae at seven.systems ---
(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.

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