[Webkit-unassigned] [Bug 13537] New: Corrupted Rendering in Canvas

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=13537

           Summary: Corrupted Rendering in Canvas
           Product: WebKit
           Version: 522+ (nightly)
          Platform: Macintosh
               URL: http://canvex.lazyilluminati.com/83/play.xhtml
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: esprehn at gmail.com


In some situations the rendering of the <canvas> on
<http://canvex.lazyilluminati.com/83/play.xhtml> becomes corrupted. Resizing
the canvas with the size links at the top of the page, which seems to reset the
canvas buffer and start over generally corrects the rendering.

Steps to reproduce:
1. At the start walk directly forward until standing on the edge of the step
out of the blue area and stop.
2. Hold the left arrow key and do a 360 degree spin.

Another Way:
1. From the start, turn and walk to the left and stop inside the doorway after
the door as gone up.
2. Face the inside room area (away from the Firefox logo).
3. Rotate 360 degrees.

Some flickering may occur, and different parts of the canvas rendering area may
become stuck displaying part of the level, while other parts keep changing.

The frame rate should also jump much higher after this.

The 360 degree spin isn't strictly required, and the bug can be produced by
doing a partial spin as you walk over the step from the blue floored area in
the middle of the room as well in other situations.

Can't produce this behavior in Opera 9 or Firefox 2, so it doesn't appear to be
a bug in the JS.


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