[Webkit-unassigned] [Bug 201487] Generate event region for both the main graphics layer and the scrolled contents layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201487

--- Comment #3 from Antti Koivisto <koivisto at iki.fi> ---
(In reply to Simon Fraser (smfr) from comment #2)
> Comment on attachment 378041 [details]
> patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=378041&action=review
> 
> Are there behavioral changes from using RenderLayerBacking::paintIntoLayer()
> now that can be tested?
> 
> > Source/WebCore/rendering/RenderLayerBacking.cpp:1601
> > +        auto clipRect = enclosingIntRect(compositedBounds());
> 
> Isn't this wrong for the scrolled contents? You need to expand the clip
> there.

Fixed this to provide the layer size as the dirty rect (it worked before in common cases because the dirty rect is mostly ignored). 

> An issue with generating the event region for the entire scrolled contents
> is that you're potentially traversing a massive render tree, most of which
> is not visible. Ideally we'd generate event regions for areas with live
> tiles only.

On the other hand we won't need to update the event region during scrolling if we generate it all at once (separate invalidation bit will enable that).

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