[Webkit-unassigned] [Bug 93174] New: RenderLayerBacking must call GraphicsLayer::setContentsToImage when the image is changed.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93174

           Summary: RenderLayerBacking must call
                    GraphicsLayer::setContentsToImage when the image is
                    changed.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


Currently, layout indirectly call RenderLayerBacking::updateGraphicsLayerConfiguration()
and updateGraphicsLayerConfiguration() indirectly call GraphicsLayer::setContentsToImage().
It burdens all accelerated compositing implementations because each implementation
should check if the image is changed.
This patch calls GraphicsLayer::setContentsToImage() when the contents of the
image is actually changed.
Texmap checks the pointer to the image, not nativeImagePtr, so Texmap currently
draws only the first frame of GIF animations. This patch makes Texmap draw GIF
animations.

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