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atlas-texture: Keep reference on potential destination atlas

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When a new CoglAtlasTexture tries to fit into an existing CoglAtlas
it should make sure the atlas stays valid while it expands.

https://bugzilla.gnome.org/show_bug.cgi?id=728064

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 2eec9758f67e9073371c2edd63379324849373c4)
This commit is contained in:
Felix Riemann 2014-04-12 00:26:00 +02:00 committed by Neil Roberts
parent 22378d572b
commit 5556241b67
1 changed files with 19 additions and 9 deletions
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28
cogl/cogl-atlas-texture.c
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@ -746,15 +746,25 @@ allocate_space (CoglAtlasTexture *atlas_tex,
/* Look for an existing atlas that can hold the texture */
for (l = ctx->atlases; l; l = l->next)
/* Try to make some space in the atlas for the texture */
if (_cogl_atlas_reserve_space (atlas = l->data,
/* Add two pixels for the border */
width + 2, height + 2,
atlas_tex))
{
cogl_object_ref (atlas);
break;
}
{
/* We need to take a reference on the atlas before trying to
* reserve space because in some circumstances atlas migration
* can cause the atlas to be freed */
atlas = cogl_object_ref (l->data);
/* Try to make some space in the atlas for the texture */
if (_cogl_atlas_reserve_space (atlas,
/* Add two pixels for the border */
width + 2, height + 2,
atlas_tex))
{
/* keep the atlas reference */
break;
}
else
{
cogl_object_unref (atlas);
}
}
/* If we couldn't find a suitable atlas then start another */
if (l == NULL)