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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - cairo-tor-scan-converter is off by half of a subrow."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=84396">84396</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>chris@chris-wilson.co.uk
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>cairo-tor-scan-converter is off by half of a subrow.
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>cairo-bugs@cairographics.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>sixtysix@inwind.it
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>image backend
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>cairo
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=106961" name="attach_106961" title="quick hack">attachment 106961</a> <a href="attachment.cgi?id=106961&action=edit" title="quick hack">[details]</a></span>
quick hack

With the attached patch running:

<span class="quote">> (cd test && CAIRO_TEST_TARGET=image DISPLAY=:2 .libs/cairo-test-suite record{,flip}-paint-alpha-clip-mask)</span >

produces 2 pairs of images that are the 180°-rotated version of each other

test/output/recordflip-paint-alpha-clip-mask.image.argb32.out.png
test/output/record-paint-alpha-clip-mask.image.argb32.out.png

test/output/recordflip-paint-alpha-clip-mask.image.rgb24.out.png
test/output/record-paint-alpha-clip-mask.image.rgb24.out.png</pre>
        </div>
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