[cairo-bugs] [Bug 13871] New: intermittent rendering artifacts: thin vertical lines on right edge of shapes

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=13871

           Summary: intermittent rendering artifacts: thin vertical lines on
                    right edge of shapes
           Product: cairo
           Version: 1.5.5
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: image backend
        AssignedTo: cworth at cworth.org
        ReportedBy: kostmo at gmail.com
         QAContact: cairo-bugs at cairographics.org


The artifacts are single-pixel-wide vertical lines on the right edge of the
shape bounding box.  They appear in the same color as the source color of the
shape.

I have included a test case written with PyCairo to demonstrate this effect. 
To see the artifacts, resize the window.  While you are dragging the window
corner around, the artifacts will appear intermittently.  The artifact is not
present when the image is saved as a PNG at the same pixel dimensions.  The
artifact often disappears after another window is moved on top of the cairo
surface and dragged off again, which forces a redraw of that part of the
surface.


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