[Webkit-unassigned] [Bug 67358] New: [skia] States of GraphicsContext may never be restored after clipToImageBuffer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67358

           Summary: [skia] States of GraphicsContext may never be restored
                    after clipToImageBuffer
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: robin.cao at torchmobile.com.cn


States of GraphicsContext may never be restored after clipToImageBuffer.

Skia doesn't support clipping to an image, so it creates a layer to implement this.
See PlatformContextSkia::beginLayerClippedToImage and PlatformContextSkia::applyClipFromImage

But in some cases, such as clipping to an empty ImageBuffer, beginLayerClippedToImage/applyClipFromImage are mismatched, which will make states of GraphicsContext busted.

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