[Webkit-unassigned] [Bug 25956] New: Canvas' composition is incorrect when alpha=0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=25956

           Summary: Canvas' composition is incorrect when alpha=0
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hamaji at chromium.org


In GraphicsContextCG and GraphicsContextSkia, there are optimization path for
alpha=0 case, with which WebKit renders nothing. However, this behavior is
incorrect for some composite modes (e.g., 'copy').

See also this bug: https://bugs.webkit.org/show_bug.cgi?id=25417


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