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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clip-polygons.xcb-render-0_0.argb32 failure"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84286">84286</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>psychon@znc.in
</td>
</tr>
<tr>
<th>Summary</th>
<td>clip-polygons.xcb-render-0_0.argb32 failure
</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>xcb backend
</td>
</tr>
<tr>
<th>Product</th>
<td>cairo
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=106795" name="attach_106795" title="quick hack">attachment 106795</a> <a href="attachment.cgi?id=106795&action=edit" title="quick hack">[details]</a></span>
quick hack
The problem is that the clip contains multiple self-intersecting paths,
in that case _cairo_clip_combine_with_surface (src/cairo-clip-surface.c:78)
uses each path separately with a fill (OPERATOR_IN), for each pixel on the
contour of more than one path that results in a different pixel coverage
than filling once with the path intersection of all paths.
In get_clip_surface (src/cairo-xcb-surface-render.c:1698) using a temoporary
clear image surface and painting in white (OPERATOR_ADD) to perform the
clip fixes
clip-polygons.xcb-render-0_0.argb32
clip-group-shapes-circles.xcb-render-0_0 .argb32 and .rgb24</pre>
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