Source code
Revision control
Copy as Markdown
Other Tools
/* 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
*
* 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-clip-inline.h"
#include "cairo-surface-clipper-private.h"
/* A collection of routines to facilitate vector surface clipping */
/* XXX Eliminate repeated paths and nested clips */
static cairo_status_t
_cairo_path_fixed_add_box (cairo_path_fixed_t *path,
const cairo_box_t *box)
{
cairo_status_t status;
status = _cairo_path_fixed_move_to (path, box->p1.x, box->p1.y);
if (unlikely (status))
return status;
status = _cairo_path_fixed_line_to (path, box->p2.x, box->p1.y);
if (unlikely (status))
return status;
status = _cairo_path_fixed_line_to (path, box->p2.x, box->p2.y);
if (unlikely (status))
return status;
status = _cairo_path_fixed_line_to (path, box->p1.x, box->p2.y);
if (unlikely (status))
return status;
return _cairo_path_fixed_close_path (path);
}
static cairo_status_t
_cairo_surface_clipper_intersect_clip_boxes (cairo_surface_clipper_t *clipper,
const cairo_clip_t *clip)
{
cairo_path_fixed_t path;
cairo_status_t status;
int i;
if (clip->num_boxes == 0)
return CAIRO_STATUS_SUCCESS;
/* Reconstruct the path for the clip boxes.
* XXX maybe a new clipper callback?
*/
_cairo_path_fixed_init (&path);
for (i = 0; i < clip->num_boxes; i++) {
status = _cairo_path_fixed_add_box (&path, &clip->boxes[i]);
if (unlikely (status)) {
_cairo_path_fixed_fini (&path);
return status;
}
}
status = clipper->intersect_clip_path (clipper, &path,
CAIRO_FILL_RULE_WINDING,
0.,
CAIRO_ANTIALIAS_DEFAULT);
_cairo_path_fixed_fini (&path);
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_clip_path_t *end)
{
cairo_status_t status;
if (clip_path->prev != end) {
status =
_cairo_surface_clipper_intersect_clip_path_recursive (clipper,
clip_path->prev,
end);
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,
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;
}
void
_cairo_surface_clipper_init (cairo_surface_clipper_t *clipper,
cairo_surface_clipper_intersect_clip_path_func_t func)
{
clipper->clip = NULL;
clipper->intersect_clip_path = func;
}
void
_cairo_surface_clipper_reset (cairo_surface_clipper_t *clipper)
{
_cairo_clip_destroy (clipper->clip);
clipper->clip = NULL;
}