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image: Add a reference for the clone's parent image

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We use the parent as a flag during map-to-image/umap-image that the
resultant image came from a fallback rather than as direct call
to the backend's map_to_image(). Whilst we use it as a simple flag,
we need to make sure the parent surface obeys the reference counting
semantics and is consistent for all callers.

Unlike other users of the parent pointer, there is no resource sharing
between the two surfaces.

Reported-by: Henry Song <henry.song@samsung.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-01-31 14:19:53 +00:00
parent ec58fde294
commit 22b7fae036
1 changed files with 8 additions and 1 deletions
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9
src/cairo-image-surface.c
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@ -1240,7 +1240,14 @@ _cairo_image_surface_clone_subimage (cairo_surface_t *surface,
if (unlikely (status))
goto error;
_cairo_image_surface_set_parent (to_image_surface (image), surface);
/* We use the parent as a flag during map-to-image/umap-image that the
* resultant image came from a fallback rather than as direct call
* to the backend's map_to_image(). Whilst we use it as a simple flag,
* we need to make sure the parent surface obeys the reference counting
* semantics and is consistent for all callers.
*/
_cairo_image_surface_set_parent (to_image_surface (image),
cairo_surface_reference (surface));
return to_image_surface (image);