[Webkit-unassigned] [Bug 120816] New: Filters buffers should track whether there is any non-1 alpha, and avoid operations on the alpha channel if necessary

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=120816

           Summary: Filters buffers should track whether there is any
                    non-1 alpha, and avoid operations on the alpha channel
                    if necessary
           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: simon.fraser at apple.com
                CC: krit at webkit.org, dino at apple.com


Filters like blur do work on the alpha channel bytes, but in many cases the alpha channel is going to be all 255, and we could avoid doing any math on it (e.g. no point blurring all-255 alpha).

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