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[surface] Check for a NULL snapshot

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The backend is permitted to return a NULL surface when snapshotting to
indicate that it cannot (or choses not to) implement the method.
This commit is contained in:
Chris Wilson 2009-08-10 17:42:05 +01:00
parent 2e8ce34454
commit 2a2a19457b
1 changed files with 13 additions and 11 deletions
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24
src/cairo-surface.c
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@ -1633,19 +1633,21 @@ _cairo_surface_snapshot (cairo_surface_t *surface)
if (surface->backend->snapshot != NULL) {
snapshot = surface->backend->snapshot (surface);
if (unlikely (snapshot->status))
return snapshot;
if (snapshot != NULL) {
if (unlikely (snapshot->status))
return snapshot;
/* Is this surface just a proxy - e.g. paginated surfaces? */
if (snapshot->backend != surface->backend) {
cairo_surface_t *previous;
/* Is this surface just a proxy - e.g. paginated surfaces? */
if (snapshot->backend != surface->backend) {
cairo_surface_t *previous;
previous = _cairo_surface_has_snapshot (surface,
snapshot->backend,
snapshot->content);
if (previous != NULL) {
cairo_surface_destroy (snapshot);
return cairo_surface_reference (previous);
previous = _cairo_surface_has_snapshot (surface,
snapshot->backend,
snapshot->content);
if (previous != NULL) {
cairo_surface_destroy (snapshot);
return cairo_surface_reference (previous);
}
}
}
}