[Webkit-unassigned] [Bug 117095] New: HTMLCanvasElement getContext and supportsContext functions assumes that a canvas cannot be changed after creation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117095

           Summary: HTMLCanvasElement getContext and supportsContext
                    functions assumes that a canvas cannot be changed
                    after creation
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ruthiecftg at gmail.com
                CC: dino at apple.com, webkit-bug-importer at group.apple.com


The implementations of getContext and supportsContext (once the patch for bug 70117 is landed) in Source/WebCore/html/HTMLCanvasElement.cpp depends on the assumption that the context does not go away upon creation (to prevent JS form seeing a dangling pointer) and disallows the context from being changed once it is created.

Thus, if a 3d context exists for a <canvas> element (by calling canvas.getsContext('webkit-3d') and supportsContext('2d') is subsequently called on that <canvas> element, then canvas.supportsContext('2d') will return false because a 3d context already exists.

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