[webkit-reviews] review granted: [Bug 196608] Update touch-action region on property changes : [Attachment 366934] patch

[bugzilla-daemon at webkit.org]

Simon Fraser (smfr) <simon.fraser at apple.com> has granted Antti Koivisto
<koivisto at iki.fi>'s request for review:
Bug 196608: Update touch-action region on property changes
https://bugs.webkit.org/show_bug.cgi?id=196608

Attachment 366934: patch

https://bugs.webkit.org/attachment.cgi?id=366934&action=review




--- Comment #4 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 366934
  --> https://bugs.webkit.org/attachment.cgi?id=366934
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=366934&action=review

> Source/WebCore/rendering/RenderLayerBacking.cpp:2489
> +    m_owningLayer.invalidateEventRegion();

It's a shame to trigger expensive event region building for non-layout changes
like color changes. Can we use a StyleDiff somewhere instead? Imagine an
animation of background-color triggering region rebuilds every frame :(