[Webkit-unassigned] [Bug 244017] Tiled layer flicker when an animation ends

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244017

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
For accelerated animations, DocumentTimeline::scheduleNextTick() starts a timer to trigger a rendering update for the next time that animations need servicing. However, there’s enough slop here that this timer fires too late:

DocumentTimeline 0x10511c500 scheduleNextTick - scheduleDelay 2.48s to fire at 68704.44432
…
DocumentTimeline 0x10511c500 scheduleAnimationResolution at 68704.55151 (timer fire)
…
Page::updateRendering() at 68704.55159

So this updateRendering() is the one too late to catch the end of the animation.

One option would be to always tick animations on every frame if a tiled layer is being animated (since we run rendering updates then every frame for tile coverage updates). Another would be to have the behavior of software animations match the CA animations, and behave like “fill-forward” until DocumentTimelinesController::updateAnimationsAndSendEvents() removes them. A third option would be to make scheduleNextTick use a slightly shorter delay.

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