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Don't crash if backend->create_similar returns a nil surface

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This fixes the bug reported here:

	cairo crashes in cairo_create_simular if nil surface returned by other->backend->create_similar
	https://bugs.freedesktop.org/show_bug.cgi?id=9844
This commit is contained in:
Carl Worth 2007-03-02 03:11:10 -08:00
parent b0c086fce4
commit 4e0f0d9425
1 changed files with 9 additions and 2 deletions
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11
src/cairo-surface.c
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@ -219,10 +219,17 @@ _cairo_surface_create_similar_scratch (cairo_surface_t *other,
if (other->status)
return (cairo_surface_t*) &_cairo_surface_nil;
if (other->backend->create_similar)
if (other->backend->create_similar) {
surface = other->backend->create_similar (other, content, width, height);
/* It's not an error if the backend didn't create a valid
* surface---it may just not be supported. */
if (surface && surface->status) {
cairo_surface_destroy (surface);
surface = NULL;
}
}
if (!surface)
if (surface == NULL)
surface = cairo_image_surface_create (format, width, height);
cairo_surface_get_font_options (other, &options);