1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2003 University of Southern California
*
* 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 University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <cworth@cworth.org>
*/
#include "cairoint.h"
#include "cairo-box-private.h"
#include "cairo-error-private.h"
#include "cairo-path-fixed-private.h"
typedef struct _cairo_path_bounder {
cairo_point_t current_point;
cairo_bool_t has_extents;
cairo_box_t extents;
} cairo_path_bounder_t;
static cairo_status_t
_cairo_path_bounder_move_to (void *closure,
const cairo_point_t *point)
{
cairo_path_bounder_t *bounder = closure;
bounder->current_point = *point;
if (likely (bounder->has_extents)) {
_cairo_box_add_point (&bounder->extents, point);
} else {
bounder->has_extents = TRUE;
_cairo_box_set (&bounder->extents, point, point);
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_line_to (void *closure,
const cairo_point_t *point)
{
cairo_path_bounder_t *bounder = closure;
bounder->current_point = *point;
_cairo_box_add_point (&bounder->extents, point);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_curve_to (void *closure,
const cairo_point_t *b,
const cairo_point_t *c,
const cairo_point_t *d)
{
cairo_path_bounder_t *bounder = closure;
_cairo_box_add_curve_to (&bounder->extents,
&bounder->current_point,
b, c, d);
bounder->current_point = *d;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_path_bounder_close_path (void *closure)
{
return CAIRO_STATUS_SUCCESS;
}
cairo_bool_t
_cairo_path_bounder_extents (const cairo_path_fixed_t *path,
cairo_box_t *extents)
{
cairo_path_bounder_t bounder;
cairo_status_t status;
bounder.has_extents = FALSE;
status = _cairo_path_fixed_interpret (path,
_cairo_path_bounder_move_to,
_cairo_path_bounder_line_to,
_cairo_path_bounder_curve_to,
_cairo_path_bounder_close_path,
&bounder);
assert (!status);
if (bounder.has_extents)
*extents = bounder.extents;
return bounder.has_extents;
}
void
_cairo_path_fixed_approximate_clip_extents (const cairo_path_fixed_t *path,
cairo_rectangle_int_t *extents)
{
_cairo_path_fixed_approximate_fill_extents (path, extents);
}
void
_cairo_path_fixed_approximate_fill_extents (const cairo_path_fixed_t *path,
cairo_rectangle_int_t *extents)
{
_cairo_path_fixed_fill_extents (path, CAIRO_FILL_RULE_WINDING, 0, extents);
}
void
_cairo_path_fixed_fill_extents (const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_rectangle_int_t *extents)
{
if (path->extents.p1.x < path->extents.p2.x &&
path->extents.p1.y < path->extents.p2.y) {
_cairo_box_round_to_rectangle (&path->extents, extents);
} else {
extents->x = extents->y = 0;
extents->width = extents->height = 0;
}
}
/* Adjusts the fill extents (above) by the device-space pen. */
void
_cairo_path_fixed_approximate_stroke_extents (const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
cairo_rectangle_int_t *extents)
{
if (path->has_extents) {
cairo_box_t box_extents;
double dx, dy;
box_extents = path->extents;
_cairo_stroke_style_max_distance_from_path (style, ctm, &dx, &dy);
box_extents.p1.x -= _cairo_fixed_from_double (dx);
box_extents.p1.y -= _cairo_fixed_from_double (dy);
box_extents.p2.x += _cairo_fixed_from_double (dx);
box_extents.p2.y += _cairo_fixed_from_double (dy);
_cairo_box_round_to_rectangle (&box_extents, extents);
} else {
extents->x = extents->y = 0;
extents->width = extents->height = 0;
}
}
cairo_status_t
_cairo_path_fixed_stroke_extents (const cairo_path_fixed_t *path,
const cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_rectangle_int_t *extents)
{
cairo_traps_t traps;
cairo_box_t bbox;
cairo_status_t status;
_cairo_traps_init (&traps);
status = _cairo_path_fixed_stroke_to_traps (path,
stroke_style,
ctm,
ctm_inverse,
tolerance,
&traps);
_cairo_traps_extents (&traps, &bbox);
_cairo_traps_fini (&traps);
_cairo_box_round_to_rectangle (&bbox, extents);
return status;
}
cairo_bool_t
_cairo_path_fixed_extents (const cairo_path_fixed_t *path,
cairo_box_t *box)
{
*box = path->extents;
return path->has_extents;
}
|
