[Webkit-unassigned] [Bug 130664] New: [CSS Blending] Compositing requirements for blending are not computed correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=130664

           Summary: [CSS Blending] Compositing requirements for blending
                    are not computed correctly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rosca at adobe.com
                CC: WebkitBugTracker at adobe.com


Here is the requirement regarding layer acceleration for blend modes:
    If a layer having blending is accelerated for any reason then its stacking context layer needs to be accelerated too.

What happens now:
1) If a blending layer is accelerated, all its RenderLayer ascendants get accelerated.  
2) If a non-accelerated layer has an accelerated sibling, then all its ascendants are accelerated.

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