[Webkit-unassigned] [Bug 171060] REGRESSION (r215469): [ios-simulator-wk2] LayoutTest compositing/animation/animation-backing.html is a flaky failure

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Apr 21 05:50:54 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=171060

--- Comment #4 from Antti Koivisto <koivisto at iki.fi> ---
(In reply to Simon Fraser (smfr) from comment #3)
> The flush needs to travers tiled layers under animating layers, because we
> have to recompute the coverage rect as the animation runs.
> 
> After your changes, how do we ensure the recomputation of coverage rects on
> all layers with scrolling etc, which is used to drop backing store outside
> the viewport, and compute the right tiling for tiled layers?

We traverse all descendants if coverage rect changes. For scrolling we take care to invalidate the scrolling layers so coverage gets recomputed. I assume we are missing or misoptimizing some invalidation with animations.

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