Pixel editor sometimes mangles bitmaps in Arc

[cjdenio]

Screen.Recording.2022-09-27.at.12.18.09.AM.mov

It looks like some of the pixel data from ctx.getImageData is slightly off.

I can't reproduce this in any other Chromium-based browser.

[kognise]

CNR in latest Arc, are you still having this issue?

[cjdenio]

Can't reproduce this on the computer I'm currently on— I'll make sure it's also fixed on my main machine

[kognise]

Truly horrible bug. Apparently canvas will occasionally slightly mangle colors, rendering a single channel off by one. When this happens and which channels are mangled seems to be up to entropy and this only happens on some browsers on some computers (and not a set with any seeming pattern, either). I'm just writing to an ImageData directly now and skipping the offscreen canvas, and all seems to be well :)