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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 --- - record-paint-alpha-clip-mask.xcb.rgb24 random failure"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84330">84330</a>
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</tr>
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<th>Assignee</th>
<td>psychon@znc.in
</td>
</tr>
<tr>
<th>Summary</th>
<td>record-paint-alpha-clip-mask.xcb.rgb24 random failure
</td>
</tr>
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<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>
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<th>Product</th>
<td>cairo
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=106861" name="attach_106861" title="quick hack">attachment 106861</a> <a href="attachment.cgi?id=106861&action=edit" title="quick hack">[details]</a></span>
quick hack
In this test there are a number of cairo_paint_with_alpha calls
with a clip composed of two non intersecting paths. In these cases
_composite_mask_clip (from src/cairo-xcb-surface-render.c lines 3458)
is executed and this function assumes that it is possible to avoid
a deferred clear. But this test shows that is not always possible,
in fact clearing the surface when info.traps.num_traps == 0, fixes
the test for the targets xcb.argb32 and xcb{,-window{,&}}.rgb24
Not clearing a surface leaves it in a status that is possibly clear and
that's the reason of the occasional failures.</pre>
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