[Webkit-unassigned] [Bug 102617] Add a 'has flipped blocks' bit somewhere to optimize stuff

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102617


Simon Fraser (smfr) <simon.fraser at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Add a 'has flipped blocks'  |Add a 'has flipped blocks'
                   |bit to RenderLayer so we    |bit somewhere to optimize
                   |can avoid a RenderObject    |stuff
                   |walk in RenderGeometryMap   |




--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com>  2012-11-30 20:53:27 PST ---
I also note that RenderBox::topLeftLocationOffset() is expensive, about 2% of the total time when scrolling a layer-heavy page. If we could do a quick check for flipped blocks, we could probably avoid the containingBlock() call and make it much faster.

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