[Webkit-unassigned] [Bug 209802] Performance issue with the canvas "globalCompositeOperation" when set to "destination-in"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209802

--- Comment #3 from register at edouardmercier.fr ---
On a 15'' MacBook Pro, mid-year, I can confirm that the performance on the composition mode "destination-out" are 10 times better than with "destination-in", which seems very weird, due to the fact that the computation should be quite similar, in terms of complexity…

This is why I reported the issue, I hope that the WebKit team will handle this with great attention, because this strange performance behavior harms the UX.

As a side note, as a comparison, on the same machine equipped with a Chromium v80, the performances are quite similar with both composition modes, and about twice faster than Safari.

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