[Webkit-unassigned] [Bug 26747] New: Repainted portion of a scaled image does not line up with full image

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=26747

           Summary: Repainted portion of a scaled image does not line up
                    with full image
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://webkit.org/demos/transitions-and-transforms/
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: simon.fraser at apple.com


To reproduce, open the attached test case. If the window size is not an integer
multiple of the native size of the background image (so it is scaled), you will
notice the background image jiggling as it is undergoes repeated partial
repaints (a 50%-height band moves down and up across the image, forcing
repainting).

The problem goes away if in BitmapImage::draw() in ImageCG.cpp,
shouldUseSubimage is forced to false.


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