[Webkit-unassigned] [Bug 67652] New: Negative width/heigh values not always treated properly by 2D canvas drawImage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67652

           Summary: Negative width/heigh values not always treated
                    properly by 2D canvas drawImage
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: junov at chromium.org
                CC: senorblanco at chromium.org, mdelaney at apple.com


Created an attachment (id=106438)
 --> (https://bugs.webkit.org/attachment.cgi?id=106438&action=review)
Test that demonstrates this bug, html part

The 2d canvas drawImage method handles negative source rectangle dimension correctly when the source image is another canvas.  When the source is an image object or a video object, rendering fails.  The correct behavior, according to the specification, is to take the rectangle bounded by (sx, sy) and (sx+sw, sy+sh). Pixel ordering should _NOT_ be flipped when sw or sh are negative.  The current layout tests for this use case only cover canvas to canvas draws (the only path that works correctly).  So a new layout test is necessary.

Attached is a tentative layout test that covers the image to canvas draw path. The test should be placed in LayoutTests/fast/canvas

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