NEW133059
Simplify RenderLayerCompositor::updateCompositingDescendantGeometry() 
https://bugs.webkit.org/show_bug.cgi?id=133059
Summary Simplify RenderLayerCompositor::updateCompositingDescendantGeometry()
Simon Fraser (smfr)
Reported 2014-05-18 21:33:12 PDT
RenderLayer::updateLayerPositions(), which is called on every layer after layout, does backing()->updateAfterLayout() which can call compositor().updateCompositingDescendantGeometry(). This is a potentially O(^2) (but I don't think it ever gets this bad because the tee walk is truncated in various ways). I think it might better to just do a RenderLayerCompositor::updateLayerTreeGeometry() after layout if !compositingLayersNeedRebuild().
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