[Webkit-unassigned] [Bug 115107] New: [Qt] Animated opacity does not trigger accelerated compositing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115107

           Summary: [Qt] Animated opacity does not trigger accelerated
                    compositing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: allan.jensen at digia.com
            Blocks: 106309


Opacity is one of the properties where we support accelerated compositing, but only animated transforms and filters they do not themselves trigger accelerated compositing. Since opacity are always performed through some type of compositing (using TransparencyLayers if not accelerated), it should always be faster for us to choose AC. 

That opacity animations does not trigger compositing was changed in http://trac.webkit.org/changeset/45309, which means it is desired behavior at least on Mac. So we should make sure this is an optional behavior change.

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