[Webkit-unassigned] [Bug 90756] New: Fix a potential bug of BitmapImage::frameCount().

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90756

           Summary: Fix a potential bug of BitmapImage::frameCount().
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


If an ImageDecoder is not yet initialized, m_source.frameCount() returns 0. This does not mean that the frame count is actually 0. So we must set m_haveFrameCount to true only when m_frameCount is not 0.

The current code is okay because BitmapImage::frameCount() is never called before the decoder is initialized. However, this no longer holds true once we introduce parallel image decoders.

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