1 /* cairo - a vector graphics library with display and print output
3 * Copyright © 2009 Chris Wilson
5 * This library is free software; you can redistribute it and/or
6 * modify it either under the terms of the GNU Lesser General Public
7 * License version 2.1 as published by the Free Software Foundation
8 * (the "LGPL") or, at your option, under the terms of the Mozilla
9 * Public License Version 1.1 (the "MPL"). If you do not alter this
10 * notice, a recipient may use your version of this file under either
11 * the MPL or the LGPL.
13 * You should have received a copy of the LGPL along with this library
14 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
16 * You should have received a copy of the MPL along with this library
17 * in the file COPYING-MPL-1.1
19 * The contents of this file are subject to the Mozilla Public License
20 * Version 1.1 (the "License"); you may not use this file except in
21 * compliance with the License. You may obtain a copy of the License at
22 * http://www.mozilla.org/MPL/
24 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
25 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
26 * the specific language governing rights and limitations.
28 * The Original Code is the cairo graphics library.
30 * The Initial Developer of the Original Code is Red Hat, Inc.
33 * Chris Wilson <chris@chris-wilson.co.uk>
38 #include "cairo-clip-inline.h"
39 #include "cairo-surface-clipper-private.h"
41 /* A collection of routines to facilitate vector surface clipping */
43 /* XXX Eliminate repeated paths and nested clips */
46 _cairo_path_fixed_add_box (cairo_path_fixed_t
*path
,
47 const cairo_box_t
*box
)
49 cairo_status_t status
;
51 status
= _cairo_path_fixed_move_to (path
, box
->p1
.x
, box
->p1
.y
);
52 if (unlikely (status
))
55 status
= _cairo_path_fixed_line_to (path
, box
->p2
.x
, box
->p1
.y
);
56 if (unlikely (status
))
59 status
= _cairo_path_fixed_line_to (path
, box
->p2
.x
, box
->p2
.y
);
60 if (unlikely (status
))
63 status
= _cairo_path_fixed_line_to (path
, box
->p1
.x
, box
->p2
.y
);
64 if (unlikely (status
))
67 return _cairo_path_fixed_close_path (path
);
71 _cairo_surface_clipper_intersect_clip_boxes (cairo_surface_clipper_t
*clipper
,
72 const cairo_clip_t
*clip
)
74 cairo_path_fixed_t path
;
75 cairo_status_t status
;
78 if (clip
->num_boxes
== 0)
79 return CAIRO_STATUS_SUCCESS
;
81 /* Reconstruct the path for the clip boxes.
82 * XXX maybe a new clipper callback?
85 _cairo_path_fixed_init (&path
);
86 for (i
= 0; i
< clip
->num_boxes
; i
++) {
87 status
= _cairo_path_fixed_add_box (&path
, &clip
->boxes
[i
]);
88 if (unlikely (status
)) {
89 _cairo_path_fixed_fini (&path
);
94 status
= clipper
->intersect_clip_path (clipper
, &path
,
95 CAIRO_FILL_RULE_WINDING
,
97 CAIRO_ANTIALIAS_DEFAULT
);
98 _cairo_path_fixed_fini (&path
);
103 static cairo_status_t
104 _cairo_surface_clipper_intersect_clip_path_recursive (cairo_surface_clipper_t
*clipper
,
105 cairo_clip_path_t
*clip_path
,
106 cairo_clip_path_t
*end
)
108 cairo_status_t status
;
110 if (clip_path
->prev
!= end
) {
112 _cairo_surface_clipper_intersect_clip_path_recursive (clipper
,
115 if (unlikely (status
))
119 return clipper
->intersect_clip_path (clipper
,
121 clip_path
->fill_rule
,
122 clip_path
->tolerance
,
123 clip_path
->antialias
);
127 _cairo_surface_clipper_set_clip (cairo_surface_clipper_t
*clipper
,
128 const cairo_clip_t
*clip
)
130 cairo_status_t status
;
131 cairo_bool_t incremental
= FALSE
;
133 if (_cairo_clip_equal (clip
, clipper
->clip
))
134 return CAIRO_STATUS_SUCCESS
;
136 /* all clipped out state should never propagate this far */
137 assert (!_cairo_clip_is_all_clipped (clip
));
139 /* XXX Is this an incremental clip? */
140 if (clipper
->clip
&& clip
&&
141 clip
->num_boxes
== clipper
->clip
->num_boxes
&&
142 memcmp (clip
->boxes
, clipper
->clip
->boxes
,
143 sizeof (cairo_box_t
) * clip
->num_boxes
) == 0)
145 cairo_clip_path_t
*clip_path
= clip
->path
;
146 while (clip_path
!= NULL
&& clip_path
!= clipper
->clip
->path
)
147 clip_path
= clip_path
->prev
;
151 status
= _cairo_surface_clipper_intersect_clip_path_recursive (clipper
,
153 clipper
->clip
->path
);
157 _cairo_clip_destroy (clipper
->clip
);
158 clipper
->clip
= _cairo_clip_copy (clip
);
163 status
= clipper
->intersect_clip_path (clipper
, NULL
, 0, 0, 0);
164 if (unlikely (status
))
168 return CAIRO_STATUS_SUCCESS
;
170 status
= _cairo_surface_clipper_intersect_clip_boxes (clipper
, clip
);
171 if (unlikely (status
))
174 if (clip
->path
!= NULL
) {
175 status
= _cairo_surface_clipper_intersect_clip_path_recursive (clipper
,
184 _cairo_surface_clipper_init (cairo_surface_clipper_t
*clipper
,
185 cairo_surface_clipper_intersect_clip_path_func_t func
)
187 clipper
->clip
= NULL
;
188 clipper
->intersect_clip_path
= func
;
192 _cairo_surface_clipper_reset (cairo_surface_clipper_t
*clipper
)
194 _cairo_clip_destroy (clipper
->clip
);
195 clipper
->clip
= NULL
;