[Webkit-unassigned] [Bug 55257] Support creating compositing layers for scrollable and overflowing objects

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55257





--- Comment #14 from Daniel Sievers <sievers at google.com>  2011-03-03 18:18:06 PST ---
(From update of attachment 84672)
View in context: https://bugs.webkit.org/attachment.cgi?id=84672&action=review

>> Source/WebCore/rendering/RenderLayerCompositor.cpp:1292
>> +        // Do not create a backing for root layers, these are handled differently.
> 
> I'm a bit confused here - why do we need the two checks?  Does isRootLayer not indicate whether the layer is a root layer?

Actually isRootLayer() returns 'true' for RenderViews that belong to a frame or iframe also:
    bool isRootLayer() const { return renderer()->isRenderView(); }

And we don't want to bail out for those.

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