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1892 | serge | 1 | /* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ |
2 | /* cairo - a vector graphics library with display and print output |
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3 | * |
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4 | * Copyright © 2002 University of Southern California |
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5 | * Copyright © 2005,2008 Red Hat Inc. |
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6 | * |
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7 | * This library is free software; you can redistribute it and/or |
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8 | * modify it either under the terms of the GNU Lesser General Public |
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9 | * License version 2.1 as published by the Free Software Foundation |
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10 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
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11 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
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12 | * notice, a recipient may use your version of this file under either |
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13 | * the MPL or the LGPL. |
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14 | * |
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15 | * You should have received a copy of the LGPL along with this library |
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16 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
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17 | * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
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18 | * You should have received a copy of the MPL along with this library |
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19 | * in the file COPYING-MPL-1.1 |
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20 | * |
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21 | * The contents of this file are subject to the Mozilla Public License |
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22 | * Version 1.1 (the "License"); you may not use this file except in |
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23 | * compliance with the License. You may obtain a copy of the License at |
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24 | * http://www.mozilla.org/MPL/ |
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25 | * |
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26 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
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27 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
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28 | * the specific language governing rights and limitations. |
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29 | * |
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30 | * The Original Code is the cairo graphics library. |
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31 | * |
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32 | * The Initial Developer of the Original Code is University of Southern |
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33 | * California. |
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34 | * |
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35 | * Contributor(s): |
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36 | * Carl D. Worth |
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37 | * Graydon Hoare |
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38 | * Owen Taylor |
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39 | * Behdad Esfahbod |
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40 | */ |
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41 | |||
42 | #define _BSD_SOURCE /* for strdup() */ |
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43 | #include "cairoint.h" |
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44 | #include "cairo-error-private.h" |
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45 | |||
46 | |||
47 | static const cairo_font_face_t _cairo_font_face_null_pointer = { |
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48 | { 0 }, /* hash_entry */ |
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49 | CAIRO_STATUS_NULL_POINTER, /* status */ |
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50 | CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
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51 | { 0, 0, 0, NULL }, /* user_data */ |
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52 | NULL |
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53 | }; |
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54 | |||
55 | static const cairo_font_face_t _cairo_font_face_invalid_string = { |
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56 | { 0 }, /* hash_entry */ |
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57 | CAIRO_STATUS_INVALID_STRING, /* status */ |
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58 | CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
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59 | { 0, 0, 0, NULL }, /* user_data */ |
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60 | NULL |
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61 | }; |
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62 | |||
63 | static const cairo_font_face_t _cairo_font_face_invalid_slant = { |
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64 | { 0 }, /* hash_entry */ |
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65 | CAIRO_STATUS_INVALID_SLANT, /* status */ |
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66 | CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
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67 | { 0, 0, 0, NULL }, /* user_data */ |
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68 | NULL |
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69 | }; |
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70 | |||
71 | static const cairo_font_face_t _cairo_font_face_invalid_weight = { |
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72 | { 0 }, /* hash_entry */ |
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73 | CAIRO_STATUS_INVALID_WEIGHT, /* status */ |
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74 | CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
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75 | { 0, 0, 0, NULL }, /* user_data */ |
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76 | NULL |
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77 | }; |
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78 | |||
79 | |||
80 | static const cairo_font_face_backend_t _cairo_toy_font_face_backend; |
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81 | |||
82 | static int |
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83 | _cairo_toy_font_face_keys_equal (const void *key_a, |
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84 | const void *key_b); |
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85 | |||
86 | /* We maintain a hash table from family/weight/slant => |
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87 | * #cairo_font_face_t for #cairo_toy_font_t. The primary purpose of |
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88 | * this mapping is to provide unique #cairo_font_face_t values so that |
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89 | * our cache and mapping from #cairo_font_face_t => #cairo_scaled_font_t |
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90 | * works. Once the corresponding #cairo_font_face_t objects fall out of |
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91 | * downstream caches, we don't need them in this hash table anymore. |
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92 | * |
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93 | * Modifications to this hash table are protected by |
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94 | * _cairo_toy_font_face_mutex. |
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95 | */ |
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96 | static cairo_hash_table_t *cairo_toy_font_face_hash_table = NULL; |
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97 | |||
98 | static cairo_hash_table_t * |
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99 | _cairo_toy_font_face_hash_table_lock (void) |
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100 | { |
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101 | CAIRO_MUTEX_LOCK (_cairo_toy_font_face_mutex); |
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102 | |||
103 | if (cairo_toy_font_face_hash_table == NULL) |
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104 | { |
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105 | cairo_toy_font_face_hash_table = |
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106 | _cairo_hash_table_create (_cairo_toy_font_face_keys_equal); |
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107 | |||
108 | if (cairo_toy_font_face_hash_table == NULL) { |
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109 | CAIRO_MUTEX_UNLOCK (_cairo_toy_font_face_mutex); |
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110 | return NULL; |
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111 | } |
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112 | } |
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113 | |||
114 | return cairo_toy_font_face_hash_table; |
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115 | } |
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116 | |||
117 | static void |
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118 | _cairo_toy_font_face_hash_table_unlock (void) |
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119 | { |
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120 | CAIRO_MUTEX_UNLOCK (_cairo_toy_font_face_mutex); |
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121 | } |
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122 | |||
123 | /** |
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124 | * _cairo_toy_font_face_init_key: |
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125 | * |
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126 | * Initialize those portions of #cairo_toy_font_face_t needed to use |
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127 | * it as a hash table key, including the hash code buried away in |
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128 | * font_face->base.hash_entry. No memory allocation is performed here |
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129 | * so that no fini call is needed. We do this to make it easier to use |
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130 | * an automatic #cairo_toy_font_face_t variable as a key. |
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131 | **/ |
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132 | static void |
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133 | _cairo_toy_font_face_init_key (cairo_toy_font_face_t *key, |
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134 | const char *family, |
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135 | cairo_font_slant_t slant, |
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136 | cairo_font_weight_t weight) |
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137 | { |
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138 | unsigned long hash; |
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139 | |||
140 | key->family = family; |
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141 | key->owns_family = FALSE; |
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142 | |||
143 | key->slant = slant; |
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144 | key->weight = weight; |
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145 | |||
146 | /* 1607 and 1451 are just a couple of arbitrary primes. */ |
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147 | hash = _cairo_hash_string (family); |
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148 | hash += ((unsigned long) slant) * 1607; |
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149 | hash += ((unsigned long) weight) * 1451; |
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150 | |||
151 | key->base.hash_entry.hash = hash; |
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152 | } |
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153 | |||
154 | static cairo_status_t |
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155 | _cairo_toy_font_face_create_impl_face (cairo_toy_font_face_t *font_face, |
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156 | cairo_font_face_t **impl_font_face) |
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157 | { |
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158 | const cairo_font_face_backend_t * backend = CAIRO_FONT_FACE_BACKEND_DEFAULT; |
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159 | cairo_int_status_t status = CAIRO_INT_STATUS_UNSUPPORTED; |
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160 | |||
161 | if (unlikely (font_face->base.status)) |
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162 | return font_face->base.status; |
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163 | |||
164 | if (backend->create_for_toy != NULL && |
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165 | |||
166 | strlen (CAIRO_USER_FONT_FAMILY_DEFAULT))) |
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167 | { |
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168 | status = backend->create_for_toy (font_face, impl_font_face); |
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169 | } |
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170 | |||
171 | if (status == CAIRO_INT_STATUS_UNSUPPORTED) { |
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172 | backend = &_cairo_user_font_face_backend; |
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173 | status = backend->create_for_toy (font_face, impl_font_face); |
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174 | } |
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175 | |||
176 | return status; |
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177 | } |
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178 | |||
179 | static cairo_status_t |
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180 | _cairo_toy_font_face_init (cairo_toy_font_face_t *font_face, |
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181 | const char *family, |
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182 | cairo_font_slant_t slant, |
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183 | cairo_font_weight_t weight) |
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184 | { |
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185 | char *family_copy; |
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186 | cairo_status_t status; |
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187 | |||
188 | family_copy = strdup (family); |
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189 | if (unlikely (family_copy == NULL)) |
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190 | return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
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191 | |||
192 | _cairo_toy_font_face_init_key (font_face, family_copy, slant, weight); |
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193 | font_face->owns_family = TRUE; |
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194 | |||
195 | _cairo_font_face_init (&font_face->base, &_cairo_toy_font_face_backend); |
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196 | |||
197 | status = _cairo_toy_font_face_create_impl_face (font_face, |
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198 | &font_face->impl_face); |
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199 | if (unlikely (status)) { |
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200 | free (family_copy); |
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201 | return status; |
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202 | } |
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203 | |||
204 | return CAIRO_STATUS_SUCCESS; |
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205 | } |
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206 | |||
207 | static void |
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208 | _cairo_toy_font_face_fini (cairo_toy_font_face_t *font_face) |
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209 | { |
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210 | /* We assert here that we own font_face->family before casting |
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211 | * away the const qualifer. */ |
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212 | assert (font_face->owns_family); |
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213 | free ((char*) font_face->family); |
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214 | |||
215 | if (font_face->impl_face) |
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216 | cairo_font_face_destroy (font_face->impl_face); |
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217 | } |
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218 | |||
219 | static int |
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220 | _cairo_toy_font_face_keys_equal (const void *key_a, |
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221 | const void *key_b) |
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222 | { |
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223 | const cairo_toy_font_face_t *face_a = key_a; |
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224 | const cairo_toy_font_face_t *face_b = key_b; |
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225 | |||
226 | return (strcmp (face_a->family, face_b->family) == 0 && |
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227 | face_a->slant == face_b->slant && |
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228 | face_a->weight == face_b->weight); |
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229 | } |
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230 | |||
231 | /** |
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232 | * cairo_toy_font_face_create: |
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233 | * @family: a font family name, encoded in UTF-8 |
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234 | * @slant: the slant for the font |
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235 | * @weight: the weight for the font |
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236 | * |
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237 | * Creates a font face from a triplet of family, slant, and weight. |
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238 | * These font faces are used in implementation of the the #cairo_t "toy" |
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239 | * font API. |
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240 | * |
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241 | * If @family is the zero-length string "", the platform-specific default |
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242 | * family is assumed. The default family then can be queried using |
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243 | * cairo_toy_font_face_get_family(). |
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244 | * |
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245 | * The cairo_select_font_face() function uses this to create font faces. |
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246 | * See that function for limitations and other details of toy font faces. |
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247 | * |
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248 | * Return value: a newly created #cairo_font_face_t. Free with |
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249 | * cairo_font_face_destroy() when you are done using it. |
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250 | * |
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251 | * Since: 1.8 |
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252 | **/ |
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253 | cairo_font_face_t * |
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254 | cairo_toy_font_face_create (const char *family, |
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255 | cairo_font_slant_t slant, |
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256 | cairo_font_weight_t weight) |
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257 | { |
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258 | cairo_status_t status; |
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259 | cairo_toy_font_face_t key, *font_face; |
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260 | cairo_hash_table_t *hash_table; |
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261 | |||
262 | if (family == NULL) |
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263 | return (cairo_font_face_t*) &_cairo_font_face_null_pointer; |
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264 | |||
265 | /* Make sure we've got valid UTF-8 for the family */ |
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266 | status = _cairo_utf8_to_ucs4 (family, -1, NULL, NULL); |
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267 | if (unlikely (status)) { |
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268 | if (status == CAIRO_STATUS_INVALID_STRING) |
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269 | return (cairo_font_face_t*) &_cairo_font_face_invalid_string; |
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270 | |||
271 | return (cairo_font_face_t*) &_cairo_font_face_nil; |
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272 | } |
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273 | |||
274 | switch (slant) { |
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275 | case CAIRO_FONT_SLANT_NORMAL: |
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276 | case CAIRO_FONT_SLANT_ITALIC: |
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277 | case CAIRO_FONT_SLANT_OBLIQUE: |
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278 | break; |
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279 | default: |
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280 | return (cairo_font_face_t*) &_cairo_font_face_invalid_slant; |
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281 | } |
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282 | |||
283 | switch (weight) { |
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284 | case CAIRO_FONT_WEIGHT_NORMAL: |
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285 | case CAIRO_FONT_WEIGHT_BOLD: |
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286 | break; |
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287 | default: |
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288 | return (cairo_font_face_t*) &_cairo_font_face_invalid_weight; |
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289 | } |
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290 | |||
291 | if (*family == '\0') |
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292 | family = CAIRO_FONT_FAMILY_DEFAULT; |
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293 | |||
294 | hash_table = _cairo_toy_font_face_hash_table_lock (); |
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295 | if (unlikely (hash_table == NULL)) |
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296 | goto UNWIND; |
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297 | |||
298 | _cairo_toy_font_face_init_key (&key, family, slant, weight); |
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299 | |||
300 | /* Return existing font_face if it exists in the hash table. */ |
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301 | font_face = _cairo_hash_table_lookup (hash_table, |
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302 | &key.base.hash_entry); |
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303 | if (font_face != NULL) { |
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304 | if (font_face->base.status == CAIRO_STATUS_SUCCESS) { |
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3959 | Serge | 305 | cairo_font_face_reference (&font_face->base); |
1892 | serge | 306 | _cairo_toy_font_face_hash_table_unlock (); |
307 | return &font_face->base; |
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308 | } |
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309 | |||
310 | /* remove the bad font from the hash table */ |
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311 | _cairo_hash_table_remove (hash_table, &font_face->base.hash_entry); |
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312 | } |
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313 | |||
314 | /* Otherwise create it and insert into hash table. */ |
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315 | font_face = malloc (sizeof (cairo_toy_font_face_t)); |
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316 | if (unlikely (font_face == NULL)) { |
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317 | status = _cairo_error (CAIRO_STATUS_NO_MEMORY); |
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318 | goto UNWIND_HASH_TABLE_LOCK; |
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319 | } |
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320 | |||
321 | status = _cairo_toy_font_face_init (font_face, family, slant, weight); |
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322 | if (unlikely (status)) |
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323 | goto UNWIND_FONT_FACE_MALLOC; |
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324 | |||
325 | assert (font_face->base.hash_entry.hash == key.base.hash_entry.hash); |
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326 | status = _cairo_hash_table_insert (hash_table, &font_face->base.hash_entry); |
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327 | if (unlikely (status)) |
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328 | goto UNWIND_FONT_FACE_INIT; |
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329 | |||
330 | _cairo_toy_font_face_hash_table_unlock (); |
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331 | |||
332 | return &font_face->base; |
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333 | |||
334 | UNWIND_FONT_FACE_INIT: |
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335 | _cairo_toy_font_face_fini (font_face); |
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336 | UNWIND_FONT_FACE_MALLOC: |
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337 | free (font_face); |
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338 | UNWIND_HASH_TABLE_LOCK: |
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339 | _cairo_toy_font_face_hash_table_unlock (); |
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340 | UNWIND: |
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341 | return (cairo_font_face_t*) &_cairo_font_face_nil; |
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342 | } |
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343 | slim_hidden_def (cairo_toy_font_face_create); |
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344 | |||
345 | static void |
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346 | _cairo_toy_font_face_destroy (void *abstract_face) |
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347 | { |
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348 | cairo_toy_font_face_t *font_face = abstract_face; |
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349 | cairo_hash_table_t *hash_table; |
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350 | |||
351 | hash_table = _cairo_toy_font_face_hash_table_lock (); |
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352 | /* All created objects must have been mapped in the hash table. */ |
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353 | assert (hash_table != NULL); |
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354 | |||
355 | if (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&font_face->base.ref_count)) { |
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356 | /* somebody recreated the font whilst we waited for the lock */ |
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357 | _cairo_toy_font_face_hash_table_unlock (); |
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358 | return; |
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359 | } |
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360 | |||
3959 | Serge | 361 | /* Font faces in SUCCESS status are guaranteed to be in the |
362 | * hashtable. Font faces in an error status are removed from the |
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363 | * hashtable if they are found during a lookup, thus they should |
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364 | * only be removed if they are in the hashtable. */ |
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365 | if (likely (font_face->base.status == CAIRO_STATUS_SUCCESS) || |
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366 | _cairo_hash_table_lookup (hash_table, &font_face->base.hash_entry) == font_face) |
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1892 | serge | 367 | _cairo_hash_table_remove (hash_table, &font_face->base.hash_entry); |
368 | |||
369 | _cairo_toy_font_face_hash_table_unlock (); |
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370 | |||
371 | _cairo_toy_font_face_fini (font_face); |
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372 | } |
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373 | |||
374 | static cairo_status_t |
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375 | _cairo_toy_font_face_scaled_font_create (void *abstract_font_face, |
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376 | const cairo_matrix_t *font_matrix, |
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377 | const cairo_matrix_t *ctm, |
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378 | const cairo_font_options_t *options, |
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379 | cairo_scaled_font_t **scaled_font) |
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380 | { |
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381 | cairo_toy_font_face_t *font_face = (cairo_toy_font_face_t *) abstract_font_face; |
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382 | |||
383 | ASSERT_NOT_REACHED; |
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384 | |||
385 | return _cairo_font_face_set_error (&font_face->base, CAIRO_STATUS_FONT_TYPE_MISMATCH); |
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386 | } |
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387 | |||
388 | static cairo_font_face_t * |
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389 | _cairo_toy_font_face_get_implementation (void *abstract_font_face, |
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390 | const cairo_matrix_t *font_matrix, |
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391 | const cairo_matrix_t *ctm, |
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392 | const cairo_font_options_t *options) |
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393 | { |
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394 | cairo_toy_font_face_t *font_face = abstract_font_face; |
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395 | |||
396 | if (font_face->impl_face) { |
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397 | cairo_font_face_t *impl = font_face->impl_face; |
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398 | |||
399 | if (impl->backend->get_implementation != NULL) { |
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400 | return impl->backend->get_implementation (impl, |
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401 | font_matrix, |
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402 | ctm, |
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403 | options); |
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404 | } |
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405 | |||
406 | return cairo_font_face_reference (impl); |
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407 | } |
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408 | |||
409 | return abstract_font_face; |
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410 | } |
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411 | |||
412 | static cairo_bool_t |
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413 | _cairo_font_face_is_toy (cairo_font_face_t *font_face) |
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414 | { |
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415 | return font_face->backend == &_cairo_toy_font_face_backend; |
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416 | } |
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417 | |||
418 | /** |
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419 | * cairo_toy_font_face_get_family: |
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420 | * @font_face: A toy font face |
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421 | * |
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422 | * Gets the familly name of a toy font. |
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423 | * |
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424 | * Return value: The family name. This string is owned by the font face |
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425 | * and remains valid as long as the font face is alive (referenced). |
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426 | * |
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427 | * Since: 1.8 |
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428 | **/ |
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429 | const char * |
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430 | cairo_toy_font_face_get_family (cairo_font_face_t *font_face) |
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431 | { |
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432 | cairo_toy_font_face_t *toy_font_face; |
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433 | |||
434 | if (font_face->status) |
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435 | return CAIRO_FONT_FAMILY_DEFAULT; |
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436 | |||
437 | toy_font_face = (cairo_toy_font_face_t *) font_face; |
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438 | if (! _cairo_font_face_is_toy (font_face)) { |
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439 | if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH)) |
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440 | return CAIRO_FONT_FAMILY_DEFAULT; |
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441 | } |
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442 | assert (toy_font_face->owns_family); |
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443 | return toy_font_face->family; |
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444 | } |
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445 | |||
446 | /** |
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447 | * cairo_toy_font_face_get_slant: |
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448 | * @font_face: A toy font face |
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449 | * |
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450 | * Gets the slant a toy font. |
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451 | * |
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452 | * Return value: The slant value |
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453 | * |
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454 | * Since: 1.8 |
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455 | **/ |
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456 | cairo_font_slant_t |
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457 | cairo_toy_font_face_get_slant (cairo_font_face_t *font_face) |
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458 | { |
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459 | cairo_toy_font_face_t *toy_font_face; |
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460 | |||
461 | if (font_face->status) |
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462 | return CAIRO_FONT_SLANT_DEFAULT; |
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463 | |||
464 | toy_font_face = (cairo_toy_font_face_t *) font_face; |
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465 | if (! _cairo_font_face_is_toy (font_face)) { |
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466 | if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH)) |
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467 | return CAIRO_FONT_SLANT_DEFAULT; |
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468 | } |
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469 | return toy_font_face->slant; |
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470 | } |
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471 | slim_hidden_def (cairo_toy_font_face_get_slant); |
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472 | |||
473 | /** |
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474 | * cairo_toy_font_face_get_weight: |
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475 | * @font_face: A toy font face |
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476 | * |
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477 | * Gets the weight a toy font. |
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478 | * |
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479 | * Return value: The weight value |
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480 | * |
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481 | * Since: 1.8 |
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482 | **/ |
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483 | cairo_font_weight_t |
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484 | cairo_toy_font_face_get_weight (cairo_font_face_t *font_face) |
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485 | { |
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486 | cairo_toy_font_face_t *toy_font_face; |
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487 | |||
488 | if (font_face->status) |
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489 | return CAIRO_FONT_WEIGHT_DEFAULT; |
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490 | |||
491 | toy_font_face = (cairo_toy_font_face_t *) font_face; |
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492 | if (! _cairo_font_face_is_toy (font_face)) { |
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493 | if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH)) |
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494 | return CAIRO_FONT_WEIGHT_DEFAULT; |
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495 | } |
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496 | return toy_font_face->weight; |
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497 | } |
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498 | slim_hidden_def (cairo_toy_font_face_get_weight); |
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499 | |||
500 | static const cairo_font_face_backend_t _cairo_toy_font_face_backend = { |
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501 | CAIRO_FONT_TYPE_TOY, |
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502 | NULL, /* create_for_toy */ |
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503 | _cairo_toy_font_face_destroy, |
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504 | _cairo_toy_font_face_scaled_font_create, |
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505 | _cairo_toy_font_face_get_implementation |
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506 | }; |
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507 | |||
508 | void |
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509 | _cairo_toy_font_face_reset_static_data (void) |
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510 | { |
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511 | cairo_hash_table_t *hash_table; |
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512 | |||
513 | /* We manually acquire the lock rather than calling |
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514 | * cairo_toy_font_face_hash_table_lock simply to avoid |
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515 | * creating the table only to destroy it again. */ |
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516 | CAIRO_MUTEX_LOCK (_cairo_toy_font_face_mutex); |
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517 | hash_table = cairo_toy_font_face_hash_table; |
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518 | cairo_toy_font_face_hash_table = NULL; |
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519 | CAIRO_MUTEX_UNLOCK (_cairo_toy_font_face_mutex); |
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520 | |||
521 | if (hash_table != NULL) |
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522 | _cairo_hash_table_destroy (hash_table); |
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523 | } |