[Webkit-unassigned] [Bug 215229] Step animations invalidate style on every rendering update whether or not they need to

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215229

--- Comment #7 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 407397
  --> https://bugs.webkit.org/attachment.cgi?id=407397
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=407397&action=review

> Source/WebCore/animation/KeyframeEffect.cpp:1498
> +    if (m_acceleratedPropertiesState == AcceleratedProperties::None || m_someKeyframesUseStepsTimingFunction || is<StepsTimingFunction>(timingFunction()))

It's GraphicsLayerCA that decides that it can't accelerate animations with steps() timing functions, so adding this code here is spreading that logic around into two places. Not great.

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