[Webkit-unassigned] [Bug 58632] New: REGRESSION: simple image compositing optimization on translucent images blends incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58632

           Summary: REGRESSION: simple image compositing optimization on
                    translucent images blends incorrectly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://trac.webkit.org/export/83947/trunk/LayoutTests/
                    compositing/direct-image-compositing.html
        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: jamesr at chromium.org
                CC: simon.fraser at apple.com, cmarrin at apple.com,
                    vangelis at chromium.org


Load http://trac.webkit.org/export/83947/trunk/LayoutTests/compositing/direct-image-compositing.html in a WebKit nightly or chromium.  The first, third, and last images render incorrectly until the window is resized - it appears that the image is composited on top of itself and so the semitranslucent parts of the image look too dark.  Forcing a repaint of the root window (by resizing the window or whatnot) seems to fix it.

I can't reproduce in Safari 5.0.4, so guessing that this regressed at some point.

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