[Bug 76919] New: Random junk at the bottom of non-multiple-of-4 compressed textures (original or mipmapped)

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=76919

          Priority: medium
            Bug ID: 76919
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Random junk at the bottom of non-multiple-of-4
                    compressed textures (original or mipmapped)
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: bugspam@moreofthesa.me.uk
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Drivers/Gallium/r600
           Product: Mesa

Created attachment 96745
  --> https://bugs.freedesktop.org/attachment.cgi?id=96745&action=edit
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 http://crunch.googlecode.com/svn/trunk/ for image
(de)compression.)

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