cairo_status_t
_cairo_surface_clipper_set_clip (cairo_surface_clipper_t *clipper,
const cairo_clip_t *clip)
{
cairo_status_t status;
cairo_bool_t incremental = FALSE;
if (_cairo_clip_equal (clip, clipper->clip))
return CAIRO_STATUS_SUCCESS;
/* all clipped out state should never propagate this far */
assert (!_cairo_clip_is_all_clipped (clip));
/* XXX Is this an incremental clip? */
if (clipper->clip && clip &&
clip->num_boxes == clipper->clip->num_boxes &&
memcmp (clip->boxes, clipper->clip->boxes,
sizeof (cairo_box_t) * clip->num_boxes) == 0)
{
cairo_clip_path_t *clip_path = clip->path;
while (clip_path != NULL && clip_path != clipper->clip->path)
clip_path = clip_path->prev;
if (clip_path) {
incremental = TRUE;
status = _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
clip->path,
clipper->clip->path);
}
}
_cairo_clip_destroy (clipper->clip);
clipper->clip = _cairo_clip_copy (clip);
if (incremental)
return status;
status = clipper->intersect_clip_path (clipper, NULL, 0, 0, 0);
if (unlikely (status))
return status;
if (clip == NULL)
return CAIRO_STATUS_SUCCESS;
status = _cairo_surface_clipper_intersect_clip_boxes (clipper, clip);
if (unlikely (status))
return status;
if (clip->path != NULL) {
status = _cairo_surface_clipper_intersect_clip_path_recursive (clipper,
clip->path,
NULL);
}
return status;
}
cairo_status_t
_cairo_surface_clipper_set_clip (cairo_surface_clipper_t *clipper,
cairo_clip_t *clip)
{
cairo_status_t status;
cairo_bool_t clear;
/* XXX as we cache a reference to the path, and compare every time,
* we may in future need to install a notification if the clip->path
* is every modified (e.g. cairo_clip_translate).
*/
if (clip == NULL && clipper->clip.path == NULL)
return CAIRO_STATUS_SUCCESS;
if (clip != NULL && clip->path == clipper->clip.path)
return CAIRO_STATUS_SUCCESS;
if (clip != NULL && clipper->clip.path != NULL &&
_cairo_path_fixed_equal (&clip->path->path, &clipper->clip.path->path))
{
return CAIRO_STATUS_SUCCESS;
}
/* all clipped out state should never propagate this far */
assert (clip == NULL || clip->path != NULL);
/* Check whether this clip is a continuation of the previous.
* If not, we have to remove the current clip and rebuild.
*/
clear = clip == NULL || clip->path->prev != clipper->clip.path;
_cairo_clip_reset (&clipper->clip);
_cairo_clip_init_copy (&clipper->clip, clip);
if (clear) {
clipper->is_clipped = FALSE;
status = clipper->intersect_clip_path (clipper, NULL, 0, 0, 0);
if (unlikely (status))
return status;
if (clip != NULL && clip->path != NULL) {
status =
_cairo_surface_clipper_intersect_clip_path_recursive (clipper,
clip->path);
clipper->is_clipped = TRUE;
}
} else {
cairo_clip_path_t *path = clip->path;
clipper->is_clipped = TRUE;
status = clipper->intersect_clip_path (clipper,
&path->path,
path->fill_rule,
path->tolerance,
path->antialias);
}
return status;
}
static cairo_status_t
_cairo_surface_clipper_intersect_clip_path_recursive (cairo_surface_clipper_t *clipper,
cairo_clip_path_t *clip_path)
{
cairo_status_t status;
if (clip_path->prev != NULL) {
status =
_cairo_surface_clipper_intersect_clip_path_recursive (clipper,
clip_path->prev);
if (unlikely (status))
return status;
}
return clipper->intersect_clip_path (clipper,
&clip_path->path,
clip_path->fill_rule,
clip_path->tolerance,
clip_path->antialias);
}
