[Webkit-unassigned] [Bug 63493] New: Overlap map for compositing needs to consider clipping

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63493

           Summary: Overlap map for compositing needs to consider clipping
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: enne at google.com
                CC: simon.fraser at apple.com, jamesr at chromium.org,
                    vangelis at chromium.org


The overlap map in RenderLayerCompositor currently doesn't consider clipping.  So, if there is a large layer that is clipped, it may cause other layers to unnecessarily become composited, even though they aren't truly overlapping once clip is considered.

See: http://crbug.com/85438

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