1 /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
2 /* cairo - a vector graphics library with display and print output
4 * Copyright © 2003 University of Southern California
6 * This library is free software; you can redistribute it and/or
7 * modify it either under the terms of the GNU Lesser General Public
8 * License version 2.1 as published by the Free Software Foundation
9 * (the "LGPL") or, at your option, under the terms of the Mozilla
10 * Public License Version 1.1 (the "MPL"). If you do not alter this
11 * notice, a recipient may use your version of this file under either
12 * the MPL or the LGPL.
14 * You should have received a copy of the LGPL along with this library
15 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
17 * You should have received a copy of the MPL along with this library
18 * in the file COPYING-MPL-1.1
20 * The contents of this file are subject to the Mozilla Public License
21 * Version 1.1 (the "License"); you may not use this file except in
22 * compliance with the License. You may obtain a copy of the License at
23 * http://www.mozilla.org/MPL/
25 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
26 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
27 * the specific language governing rights and limitations.
29 * The Original Code is the cairo graphics library.
31 * The Initial Developer of the Original Code is University of Southern
35 * Carl D. Worth <cworth@cworth.org>
39 #include "cairo-box-inline.h"
40 #include "cairo-error-private.h"
41 #include "cairo-path-fixed-private.h"
43 typedef struct _cairo_path_bounder
{
44 cairo_point_t current_point
;
45 cairo_bool_t has_extents
;
47 } cairo_path_bounder_t
;
50 _cairo_path_bounder_move_to (void *closure
,
51 const cairo_point_t
*point
)
53 cairo_path_bounder_t
*bounder
= closure
;
55 bounder
->current_point
= *point
;
57 if (likely (bounder
->has_extents
)) {
58 _cairo_box_add_point (&bounder
->extents
, point
);
60 bounder
->has_extents
= TRUE
;
61 _cairo_box_set (&bounder
->extents
, point
, point
);
64 return CAIRO_STATUS_SUCCESS
;
68 _cairo_path_bounder_line_to (void *closure
,
69 const cairo_point_t
*point
)
71 cairo_path_bounder_t
*bounder
= closure
;
73 bounder
->current_point
= *point
;
74 _cairo_box_add_point (&bounder
->extents
, point
);
76 return CAIRO_STATUS_SUCCESS
;
80 _cairo_path_bounder_curve_to (void *closure
,
81 const cairo_point_t
*b
,
82 const cairo_point_t
*c
,
83 const cairo_point_t
*d
)
85 cairo_path_bounder_t
*bounder
= closure
;
87 _cairo_box_add_curve_to (&bounder
->extents
,
88 &bounder
->current_point
,
90 bounder
->current_point
= *d
;
92 return CAIRO_STATUS_SUCCESS
;
96 _cairo_path_bounder_close_path (void *closure
)
98 return CAIRO_STATUS_SUCCESS
;
102 _cairo_path_bounder_extents (const cairo_path_fixed_t
*path
,
103 cairo_box_t
*extents
)
105 cairo_path_bounder_t bounder
;
106 cairo_status_t status
;
108 bounder
.has_extents
= FALSE
;
109 status
= _cairo_path_fixed_interpret (path
,
110 _cairo_path_bounder_move_to
,
111 _cairo_path_bounder_line_to
,
112 _cairo_path_bounder_curve_to
,
113 _cairo_path_bounder_close_path
,
117 if (bounder
.has_extents
)
118 *extents
= bounder
.extents
;
120 return bounder
.has_extents
;
124 _cairo_path_fixed_approximate_clip_extents (const cairo_path_fixed_t
*path
,
125 cairo_rectangle_int_t
*extents
)
127 _cairo_path_fixed_approximate_fill_extents (path
, extents
);
131 _cairo_path_fixed_approximate_fill_extents (const cairo_path_fixed_t
*path
,
132 cairo_rectangle_int_t
*extents
)
134 _cairo_path_fixed_fill_extents (path
, CAIRO_FILL_RULE_WINDING
, 0, extents
);
138 _cairo_path_fixed_fill_extents (const cairo_path_fixed_t
*path
,
139 cairo_fill_rule_t fill_rule
,
141 cairo_rectangle_int_t
*extents
)
143 if (path
->extents
.p1
.x
< path
->extents
.p2
.x
&&
144 path
->extents
.p1
.y
< path
->extents
.p2
.y
) {
145 _cairo_box_round_to_rectangle (&path
->extents
, extents
);
147 extents
->x
= extents
->y
= 0;
148 extents
->width
= extents
->height
= 0;
152 /* Adjusts the fill extents (above) by the device-space pen. */
154 _cairo_path_fixed_approximate_stroke_extents (const cairo_path_fixed_t
*path
,
155 const cairo_stroke_style_t
*style
,
156 const cairo_matrix_t
*ctm
,
157 cairo_rectangle_int_t
*extents
)
159 if (path
->has_extents
) {
160 cairo_box_t box_extents
;
163 _cairo_stroke_style_max_distance_from_path (style
, path
, ctm
, &dx
, &dy
);
165 box_extents
= path
->extents
;
166 box_extents
.p1
.x
-= _cairo_fixed_from_double (dx
);
167 box_extents
.p1
.y
-= _cairo_fixed_from_double (dy
);
168 box_extents
.p2
.x
+= _cairo_fixed_from_double (dx
);
169 box_extents
.p2
.y
+= _cairo_fixed_from_double (dy
);
171 _cairo_box_round_to_rectangle (&box_extents
, extents
);
173 extents
->x
= extents
->y
= 0;
174 extents
->width
= extents
->height
= 0;
179 _cairo_path_fixed_stroke_extents (const cairo_path_fixed_t
*path
,
180 const cairo_stroke_style_t
*stroke_style
,
181 const cairo_matrix_t
*ctm
,
182 const cairo_matrix_t
*ctm_inverse
,
184 cairo_rectangle_int_t
*extents
)
186 cairo_polygon_t polygon
;
187 cairo_status_t status
;
189 _cairo_polygon_init (&polygon
, NULL
, 0);
190 status
= _cairo_path_fixed_stroke_to_polygon (path
,
195 _cairo_box_round_to_rectangle (&polygon
.extents
, extents
);
196 _cairo_polygon_fini (&polygon
);
202 _cairo_path_fixed_extents (const cairo_path_fixed_t
*path
,
205 *box
= path
->extents
;
206 return path
->has_extents
;