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wayland: deal with staging buffer getting allocated prematurely

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The staging buffer gets allocated any time begin_paint is called
on the window. This can happen even with an empty paint region,
so we should cope with that situation. At the moment we crash
trying to post a runtime warning.

https://bugzilla.gnome.org/show_bug.cgi?id=762755
This commit is contained in:
Ray Strode
2016-02-27 16:17:38 -05:00
parent 6ad67451f4
commit 316fe1dbbd
1 changed files with 23 additions and 10 deletions
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33
gdk/wayland/gdkwindow-wayland.c
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@ -674,19 +674,32 @@ buffer_release_callback (void *_data,
return;
}
/* If we've staged updates into a new buffer before the release for this
* buffer came in, then we can't reuse this buffer, so unref it. It may still
* be alive as a readback buffer though.
*/
if (impl->staging_cairo_surface != NULL)
if (impl->staged_updates_region != NULL)
{
/* If this fails, then we've allocated a staging buffer prematurely.
* We didn't have any screen updates.
/* If this fails, then we're tracking staged updates on a staging surface
* that doesn't exist.
*/
g_warn_if_fail (!cairo_region_is_empty (impl->staged_updates_region));
g_warn_if_fail (impl->staging_cairo_surface != NULL);
g_clear_pointer (&impl->committed_cairo_surface, cairo_surface_destroy);
return;
/* If we've staged updates into a new buffer before the release for this
* buffer came in, then we can't reuse this buffer, so unref it. It may still
* be alive as a readback buffer though (via impl->backfill_cairo_surface).
*
* It's possible a staging surface was allocated but no updates were staged.
* If that happened, clean up that staging surface now, since the old commit
* buffer is available again, and reusing the old commit buffer for future
* updates will save having to do a read back later.
*/
if (!cairo_region_is_empty (impl->staged_updates_region))
{
g_clear_pointer (&impl->committed_cairo_surface, cairo_surface_destroy);
return;
}
else
{
g_clear_pointer (&impl->staged_updates_region, cairo_region_destroy);
g_clear_pointer (&impl->staging_cairo_surface, cairo_surface_destroy);
}
}
/* Release came in, we haven't done any interim updates, so we can just use