RESOLVED INVALID 68416
RenderLayer::root() should not traverse the layer tree for rooted layers 
https://bugs.webkit.org/show_bug.cgi?id=68416
Summary RenderLayer::root() should not traverse the layer tree for rooted layers
Julien Chaffraix
Reported 2011-09-19 17:48:31 PDT
Currently we always traverse the RenderLayer up to the root to know which layer is our root. However using the RenderTree we have a way of getting the root RenderLayer's in a constant time. As there is no guarantee that a layer is rooted, we cannot remove the old code but it is fairly common to call root() in a rooted layer (updateLayerPositions for example is called from the FrameView).
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Julien Chaffraix
Comment 1 2011-09-19 18:20:53 PDT
> As there is no guarantee that a layer is rooted, we cannot remove the old code but it is fairly common to call root() in a rooted layer (updateLayerPositions for example is called from the FrameView). Unfortunately I missed something on this bug: we have no way of knowing if we are rooted unless we walk to the root (calling RenderObject::view() can return something even if we are *not* rooted).
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