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<body><span class="vcard"><a class="email" href="mailto:marc-andre.parent@grassvalley.com" title="marc-andre.parent@grassvalley.com">marc-andre.parent@grassvalley.com</a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - 915GM/945GM XRender does not display stretched image when multiple windows overlap on second display."
href="https://bugs.freedesktop.org/show_bug.cgi?id=93816">bug 93816</a>
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<td>marc-andre.parent@grassvalley.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - 915GM/945GM XRender does not display stretched image when multiple windows overlap on second display."
href="https://bugs.freedesktop.org/show_bug.cgi?id=93816#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - 915GM/945GM XRender does not display stretched image when multiple windows overlap on second display."
href="https://bugs.freedesktop.org/show_bug.cgi?id=93816">bug 93816</a>
from <span class="vcard"><a class="email" href="mailto:marc-andre.parent@grassvalley.com" title="marc-andre.parent@grassvalley.com">marc-andre.parent@grassvalley.com</a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=121466" name="attach_121466" title="C code to replicate the issue along with driver debug logs">attachment 121466</a> <a href="attachment.cgi?id=121466&action=edit" title="C code to replicate the issue along with driver debug logs">[details]</a></span>
C code to replicate the issue along with driver debug logs
In c_test_app.zip, there is a c application which replicates the issue using
only Xlib and Xrender calls.
To compile: gcc xrenderscaledimage.c -o xrenderscaledimage -lX11 -lm -lXrender
Here's what the application does:
1. Creates two 1920x1080 side-by-side colored windows(1 & 2) and maps them.
2. Creates two smaller white windows(3 & 4) of 150x150 and maps them over the
first two.
3. Creates Pictures for windows 1 and 2.
4. Creates two Pictures for an image and scales them from 300x300 to 600x600.
5. On the 'Expose' event, the image Pictures are XRenderComposite'd over the
window Pictures.
***The problem is that on the second head, the scaled image is not displayed.
If SCALE_FACTOR in xrenderscaledimage.c is set to 1.0 the problem doesn't
occur.
In c_test_app.zip, there is also intel driver debug logs for executing the code
separately on each head. Strangely, at some point, there seems to be negative
coordinates used for the second head:
sna_blt_copy_boxes src=(0, 0) -> (-1920, 0) x 1, tiling=(0, 1), pitch=(15360,
4096)</pre>
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