[cairo-bugs] [Bug 15349] New: bad clipping with EXTEND_NONE

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Apr 4 06:39:11 PDT 2008


           Summary: bad clipping with EXTEND_NONE
           Product: cairo
           Version: 1.5.17
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: otaylor at redhat.com
         QAContact: cairo-bugs at cairographics.org

Created an attachment (id=15673)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15673)
Python test case

With the image backend, drawing a surface pattern with EXTEND none seems to
use a rectangular clip around the transformed bounds of the source image. 
But when a transform of any type (other than integer translation
and 90 degree rotation) is in effect, this isn't right ... the area
of possible effect extends half a source pixel further.

Attached image and python test case demonstrate. (I haven't tested on other
backends, so I'm not sure if it's a backend/pixman problem or cairo

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