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3959 | Serge | 1 | /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ |
1892 | serge | 2 | /* cairo - a vector graphics library with display and print output |
3 | * |
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4 | * Copyright © 2003 University of Southern California |
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5 | * |
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6 | * This library is free software; you can redistribute it and/or |
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7 | * modify it either under the terms of the GNU Lesser General Public |
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8 | * License version 2.1 as published by the Free Software Foundation |
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9 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
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10 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
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11 | * notice, a recipient may use your version of this file under either |
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12 | * the MPL or the LGPL. |
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13 | * |
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14 | * You should have received a copy of the LGPL along with this library |
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15 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
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16 | * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
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17 | * You should have received a copy of the MPL along with this library |
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18 | * in the file COPYING-MPL-1.1 |
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19 | * |
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20 | * The contents of this file are subject to the Mozilla Public License |
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21 | * Version 1.1 (the "License"); you may not use this file except in |
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22 | * compliance with the License. You may obtain a copy of the License at |
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23 | * http://www.mozilla.org/MPL/ |
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24 | * |
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25 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
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26 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
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27 | * the specific language governing rights and limitations. |
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28 | * |
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29 | * The Original Code is the cairo graphics library. |
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30 | * |
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31 | * The Initial Developer of the Original Code is University of Southern |
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32 | * California. |
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33 | * |
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34 | * Contributor(s): |
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35 | * Carl D. Worth |
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36 | */ |
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37 | |||
38 | #include "cairoint.h" |
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3959 | Serge | 39 | #include "cairo-box-inline.h" |
40 | #include "cairo-error-private.h" |
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1892 | serge | 41 | #include "cairo-path-fixed-private.h" |
42 | |||
3959 | Serge | 43 | typedef struct _cairo_path_bounder { |
1892 | serge | 44 | cairo_point_t current_point; |
3959 | Serge | 45 | cairo_bool_t has_extents; |
1892 | serge | 46 | cairo_box_t extents; |
47 | } cairo_path_bounder_t; |
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48 | |||
49 | static cairo_status_t |
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50 | _cairo_path_bounder_move_to (void *closure, |
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51 | const cairo_point_t *point) |
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52 | { |
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53 | cairo_path_bounder_t *bounder = closure; |
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54 | |||
55 | bounder->current_point = *point; |
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56 | |||
3959 | Serge | 57 | if (likely (bounder->has_extents)) { |
58 | _cairo_box_add_point (&bounder->extents, point); |
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59 | } else { |
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60 | bounder->has_extents = TRUE; |
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61 | _cairo_box_set (&bounder->extents, point, point); |
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62 | } |
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63 | |||
1892 | serge | 64 | return CAIRO_STATUS_SUCCESS; |
65 | } |
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66 | |||
67 | static cairo_status_t |
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68 | _cairo_path_bounder_line_to (void *closure, |
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69 | const cairo_point_t *point) |
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70 | { |
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71 | cairo_path_bounder_t *bounder = closure; |
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72 | |||
73 | bounder->current_point = *point; |
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3959 | Serge | 74 | _cairo_box_add_point (&bounder->extents, point); |
1892 | serge | 75 | |
76 | return CAIRO_STATUS_SUCCESS; |
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77 | } |
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78 | |||
79 | static cairo_status_t |
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80 | _cairo_path_bounder_curve_to (void *closure, |
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81 | const cairo_point_t *b, |
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82 | const cairo_point_t *c, |
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83 | const cairo_point_t *d) |
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84 | { |
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85 | cairo_path_bounder_t *bounder = closure; |
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86 | |||
3959 | Serge | 87 | _cairo_box_add_curve_to (&bounder->extents, |
88 | &bounder->current_point, |
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89 | b, c, d); |
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90 | bounder->current_point = *d; |
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1892 | serge | 91 | |
3959 | Serge | 92 | return CAIRO_STATUS_SUCCESS; |
1892 | serge | 93 | } |
94 | |||
95 | static cairo_status_t |
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96 | _cairo_path_bounder_close_path (void *closure) |
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97 | { |
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98 | return CAIRO_STATUS_SUCCESS; |
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99 | } |
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100 | |||
3959 | Serge | 101 | cairo_bool_t |
102 | _cairo_path_bounder_extents (const cairo_path_fixed_t *path, |
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103 | cairo_box_t *extents) |
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104 | { |
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105 | cairo_path_bounder_t bounder; |
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106 | cairo_status_t status; |
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107 | |||
108 | bounder.has_extents = FALSE; |
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109 | status = _cairo_path_fixed_interpret (path, |
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110 | _cairo_path_bounder_move_to, |
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111 | _cairo_path_bounder_line_to, |
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112 | _cairo_path_bounder_curve_to, |
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113 | _cairo_path_bounder_close_path, |
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114 | &bounder); |
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115 | assert (!status); |
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116 | |||
117 | if (bounder.has_extents) |
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118 | *extents = bounder.extents; |
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119 | |||
120 | return bounder.has_extents; |
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121 | } |
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122 | |||
1892 | serge | 123 | void |
124 | _cairo_path_fixed_approximate_clip_extents (const cairo_path_fixed_t *path, |
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125 | cairo_rectangle_int_t *extents) |
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126 | { |
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3959 | Serge | 127 | _cairo_path_fixed_approximate_fill_extents (path, extents); |
1892 | serge | 128 | } |
129 | |||
130 | void |
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131 | _cairo_path_fixed_approximate_fill_extents (const cairo_path_fixed_t *path, |
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132 | cairo_rectangle_int_t *extents) |
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133 | { |
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3959 | Serge | 134 | _cairo_path_fixed_fill_extents (path, CAIRO_FILL_RULE_WINDING, 0, extents); |
1892 | serge | 135 | } |
136 | |||
137 | void |
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138 | _cairo_path_fixed_fill_extents (const cairo_path_fixed_t *path, |
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139 | cairo_fill_rule_t fill_rule, |
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140 | double tolerance, |
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141 | cairo_rectangle_int_t *extents) |
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142 | { |
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3959 | Serge | 143 | if (path->extents.p1.x < path->extents.p2.x && |
144 | path->extents.p1.y < path->extents.p2.y) { |
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145 | _cairo_box_round_to_rectangle (&path->extents, extents); |
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1892 | serge | 146 | } else { |
147 | extents->x = extents->y = 0; |
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148 | extents->width = extents->height = 0; |
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149 | } |
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150 | } |
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151 | |||
152 | /* Adjusts the fill extents (above) by the device-space pen. */ |
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153 | void |
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154 | _cairo_path_fixed_approximate_stroke_extents (const cairo_path_fixed_t *path, |
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155 | const cairo_stroke_style_t *style, |
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156 | const cairo_matrix_t *ctm, |
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157 | cairo_rectangle_int_t *extents) |
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158 | { |
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3959 | Serge | 159 | if (path->has_extents) { |
160 | cairo_box_t box_extents; |
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1892 | serge | 161 | double dx, dy; |
162 | |||
3959 | Serge | 163 | _cairo_stroke_style_max_distance_from_path (style, path, ctm, &dx, &dy); |
1892 | serge | 164 | |
3959 | Serge | 165 | box_extents = path->extents; |
166 | box_extents.p1.x -= _cairo_fixed_from_double (dx); |
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167 | box_extents.p1.y -= _cairo_fixed_from_double (dy); |
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168 | box_extents.p2.x += _cairo_fixed_from_double (dx); |
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169 | box_extents.p2.y += _cairo_fixed_from_double (dy); |
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1892 | serge | 170 | |
3959 | Serge | 171 | _cairo_box_round_to_rectangle (&box_extents, extents); |
1892 | serge | 172 | } else { |
173 | extents->x = extents->y = 0; |
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174 | extents->width = extents->height = 0; |
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175 | } |
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176 | } |
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177 | |||
178 | cairo_status_t |
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179 | _cairo_path_fixed_stroke_extents (const cairo_path_fixed_t *path, |
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180 | const cairo_stroke_style_t *stroke_style, |
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181 | const cairo_matrix_t *ctm, |
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182 | const cairo_matrix_t *ctm_inverse, |
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183 | double tolerance, |
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184 | cairo_rectangle_int_t *extents) |
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185 | { |
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3959 | Serge | 186 | cairo_polygon_t polygon; |
1892 | serge | 187 | cairo_status_t status; |
188 | |||
3959 | Serge | 189 | _cairo_polygon_init (&polygon, NULL, 0); |
190 | status = _cairo_path_fixed_stroke_to_polygon (path, |
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191 | stroke_style, |
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192 | ctm, ctm_inverse, |
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193 | tolerance, |
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194 | &polygon); |
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195 | _cairo_box_round_to_rectangle (&polygon.extents, extents); |
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196 | _cairo_polygon_fini (&polygon); |
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1892 | serge | 197 | |
198 | return status; |
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199 | } |
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200 | |||
201 | cairo_bool_t |
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202 | _cairo_path_fixed_extents (const cairo_path_fixed_t *path, |
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203 | cairo_box_t *box) |
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204 | { |
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3959 | Serge | 205 | *box = path->extents; |
206 | return path->has_extents; |
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1892 | serge | 207 | }>> |