forked from KolibriOS/kolibrios
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/* cairo - a vector graphics library with display and print output
|
|
*
|
|
* Copyright © 2009 Chris Wilson
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it either under the terms of the GNU Lesser General Public
|
|
* License version 2.1 as published by the Free Software Foundation
|
|
* (the "LGPL") or, at your option, under the terms of the Mozilla
|
|
* Public License Version 1.1 (the "MPL"). If you do not alter this
|
|
* notice, a recipient may use your version of this file under either
|
|
* the MPL or the LGPL.
|
|
*
|
|
* You should have received a copy of the LGPL along with this library
|
|
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
|
|
* You should have received a copy of the MPL along with this library
|
|
* in the file COPYING-MPL-1.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License
|
|
* Version 1.1 (the "License"); you may not use this file except in
|
|
* compliance with the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
|
|
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
|
|
* the specific language governing rights and limitations.
|
|
*
|
|
* The Original Code is the cairo graphics library.
|
|
*
|
|
* The Initial Developer of the Original Code is Red Hat, Inc.
|
|
*
|
|
* Contributor(s):
|
|
* Chris Wilson <chris@chris-wilson.co.uk>
|
|
*/
|
|
|
|
#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;
|
|
}
|