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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "cairoint.h"
#include "cairo-surface-clipper-private.h"
/* A collection of routines to facilitate vector surface clipping */
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);
}
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 && clipper->clip.path != NULL &&
_cairo_clip_equal (clip, &clipper->clip))
{
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;
}
void
_cairo_surface_clipper_init (cairo_surface_clipper_t *clipper,
cairo_surface_clipper_intersect_clip_path_func_t func)
{
_cairo_clip_init (&clipper->clip);
clipper->is_clipped = FALSE;
clipper->intersect_clip_path = func;
}
void
_cairo_surface_clipper_reset (cairo_surface_clipper_t *clipper)
{
_cairo_clip_reset (&clipper->clip);
clipper->is_clipped = FALSE;
}
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