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<body><span class="vcard"><a class="email" href="mailto:psychon@znc.in" title="Uli Schlachter <psychon@znc.in>"> <span class="fn">Uli Schlachter</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - integrated VNC/Spice viewer widget in virt-manager stops updating w/ xlib-xcb enabled cairo"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85005">bug 85005</a>
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<table border="1" cellspacing="0" cellpadding="8">
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<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>NOTOURBUG
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - integrated VNC/Spice viewer widget in virt-manager stops updating w/ xlib-xcb enabled cairo"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85005#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - integrated VNC/Spice viewer widget in virt-manager stops updating w/ xlib-xcb enabled cairo"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85005">bug 85005</a>
from <span class="vcard"><a class="email" href="mailto:psychon@znc.in" title="Uli Schlachter <psychon@znc.in>"> <span class="fn">Uli Schlachter</span></a>
</span></b>
<pre>Sigh. The bug is in spice.
In `spike-gtk-0.25` (I'm looking at the version in debian testing), go to
`gtk/spice-widget-cairo.c`, line 126. After the `if (d->ximage) {` add
`cairo_surface_mark_dirty(d->ximage)` and see if that fixes the problem. It
might also make everything die with an assertion failure.
I cannot find any code that draws to the cairo image surface that is saved in
`d->ximage`, but from what I see is that spice is modifying the image data
inside of an image surface behind of cairo's back. Spice has to call
`cairo_surface_flush()` before drawing directly to that data and
`cairo_surface_mark_dirty()` or `cairo_surface_mark_dirty_area()` afterwards.
Without this, cairo assumes that the pixel content of the image surface did not
change and thus does some clever caching to speed things up. This might only
break with `xlib-xcb`, but is still a bug in spice.</pre>
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