[Webkit-unassigned] [Bug 98177] Needless repaints at the beginning and end of a transition of a translate3d.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98177





--- Comment #2 from Adrienne Walker <enne at google.com>  2012-10-02 14:42:56 PST ---
(In reply to comment #1)
> This is because we turn off overlap testing when there's a transform animation running.

Yes, that explains "Observation 1", since we don't want the animation to jank when the first "opacity" layer overlaps it.

However, that doesn't explain "Observation 3".  Since the third "opacity" element already has a composited parent, there's no need to promote it.  Once something becomes a composited layer, it seems like we should turn back on overlap testing.

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