[Webkit-unassigned] [Bug 50775] New: Jittering when animating a rotated image

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50775

           Summary: Jittering when animating a rotated image
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: danrice at gmail.com
                CC: mdelaney at apple.com


Created an attachment (id=76102)
 --> (https://bugs.webkit.org/attachment.cgi?id=76102&action=review)
Reproducible test case

The attached html/js file displays an animation of a rotating checkerboard image, along with a magnified view of each frame as it is drawn.  When the image is at a rotation angle near 45 degrees, it appears to shake.  Playing the same animation on Firefox gives a smooth appearance, where the antialiasing around the internal edges changes in a steady manner from frame to frame.

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