RESOLVED FIXED 102617
Add a 'has flipped blocks' bit somewhere to optimize stuff 
https://bugs.webkit.org/show_bug.cgi?id=102617
Summary Add a 'has flipped blocks' bit somewhere to optimize stuff
Simon Fraser (smfr)
Reported 2012-11-18 12:00:33 PST
canMapBetweenRenderers() has to walk renderers looking for flipped blocks, which is unfortunate because this slows down the layer->layer mapping optimization there. A bit on RenderLayer that says "hasFlippedBlocks contents" would help.
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Simon Fraser (smfr)
Comment 1 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.
Dave Hyatt
Comment 2 2015-05-06 12:37:22 PDT
I added this, so this bug can be closed.
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