[Webkit-unassigned] [Bug 93344] New: CanvasRenderingContext2D::createPattern() should return null, if non-decodable image argument

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93344

           Summary: CanvasRenderingContext2D::createPattern() should
                    return null, if non-decodable image argument
           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: jussi.kukkonen at intel.com


Spec says: "If the image argument is an HTMLImageElement object that is not fully decodable ... then the implementation must return null." This does not currently happen so these tests fail:
  canvas/philip/tests/2d.pattern.image.broken.html = TEXT
  canvas/philip/tests/2d.pattern.image.incomplete.empty.html = TEXT
  canvas/philip/tests/2d.pattern.image.incomplete.omitted.html = TEXT


HTMLImageElement does not seem to have "decodability" as a property and things are slightly complicated by the img.complete property being slightly illogical for this: currently images with empty, missing or non-existing source are "complete" (and IIRC this is according to current spec). So possibly these cases would have to be tested in CanvasRenderingContext2D. I'll take a closer look, advice is welcome also.

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