[Webkit-unassigned] [Bug 34505] New: RenderLayer::convertToLayerCoords() is called through transformed layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=34505

           Summary: RenderLayer::convertToLayerCoords() is called through
                    transformed layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jamesr at chromium.org
                CC: hyatt at apple.com, simon.fraser at apple.com


The comments in RenderLayer.cpp indicate that
RenderLayer::convertToLayerCoords() is never used to map between transformed
layers.  This seems to not actually be the case - in particular adding the
assertion:

    ASSERT(!parentLayer->hasTransform());

at http://trac.webkit.org/browser/trunk/WebCore/rendering/RenderLayer.cpp#L1081
trips on lots of tests.  Some of the tests that trip this are:

  fast/repaint/block-selection-gap-in-composited-layer.html
  fast/repaint/reflection-repaint-test.html
  fast/repaint/subtree-layoutstate-transform.html
  fast/repaint/transform-absolute-child.html
  fast/repaint/transform-repaint-descendants.html
  fast/transforms/overflow-with-transform.html
  fast/transforms/transform-positioned-ancestor.html
  fast/transforms/transformed-focused-text-input.html
  fast/transforms/transforms-with-opacity.html

I don't know if the assertion is incorrect, the comments are incorrect, or the
code is wrong.

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