[Webkit-unassigned] [Bug 89246] New: do not multiply/demultiply colors when alpha is 255

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89246

           Summary: do not multiply/demultiply colors when alpha is 255
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: arno at renevier.net


Hi,

currently, when computing color from premultiplied ARGB, and vice/versa (colorFromPremultipliedARGB and premultipliedARGBFromColor functions), the computation is performed if alpha is non 0. But if alpha is 255, computation is the identity computation. So we can avoid this computation in the case alpha is 255.

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