[Webkit-unassigned] [Bug 16169] New: GIF ImageDecoder hasAlpha() return value incorrect

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=16169

           Summary: GIF ImageDecoder hasAlpha() return value incorrect
           Product: WebKit
           Version: 525+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: Gtk, Cairo
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: alp at atoker.com
                CC: zerodpx at gmail.com


Commit r28068 to fix #15974 caused a change in the return value of hasAlpha()
for GIF animation frames. Frames that have transparency used to return true but
now return false.

Looks like "replace" frames return true as expected but "combine" frames always
return false now where one would expect true, which should probably remain an
implementation detail internal to the GIF decoder rather than affecting
hasAlpha().

Test case attached.


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