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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 --- - Random junk at the bottom of non-multiple-of-4 compressed textures (original or mipmapped)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76919">76919</a>
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</tr>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Random junk at the bottom of non-multiple-of-4 compressed textures (original or mipmapped)
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>bugspam@moreofthesa.me.uk
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>Drivers/Gallium/r600
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=96745" name="attach_96745" title="Example image (with mipmaps), the height of which triggers the problem">attachment 96745</a> <a href="attachment.cgi?id=96745&action=edit" title="Example image (with mipmaps), the height of which triggers the problem">[details]</a></span>
Example image (with mipmaps), the height of which triggers the problem
There seems to be a problem with some compressed textures. When the height of
the image (more specifically, of the mipmap level used) is not a multiple of 4,
it appears that the bottom part of the image – as rendered – contains random
junk, apparently set at image load time.
The example image will show the problem at its original size. I've also played
with its height (initially 570px): increasing it to a multiple of 4 would
remove the problem if it's rendered using the full-size version, but since when
reduced by one level the height is again not a multiple of 4, the problem
re-appears. Setting the full-size height to 576px moves the problem down
further.
(We're using <a href="http://crunch.googlecode.com/svn/trunk/">http://crunch.googlecode.com/svn/trunk/</a> for image
(de)compression.)</pre>
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</p>
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