Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-shape.cc @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright © 2009 Red Hat, Inc.
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3 * Copyright © 2012 Google, Inc.
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4 *
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5 * This is part of HarfBuzz, a text shaping library.
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6 *
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7 * Permission is hereby granted, without written agreement and without
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8 * license or royalty fees, to use, copy, modify, and distribute this
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9 * software and its documentation for any purpose, provided that the
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10 * above copyright notice and the following two paragraphs appear in
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11 * all copies of this software.
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12 *
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13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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17 * DAMAGE.
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18 *
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19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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24 *
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25 * Red Hat Author(s): Behdad Esfahbod
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26 * Google Author(s): Behdad Esfahbod
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27 */
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29 #include "hb.hh"
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31 #include "hb-shaper.hh"
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32 #include "hb-shape-plan.hh"
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33 #include "hb-buffer.hh"
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34 #include "hb-font.hh"
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35 #include "hb-machinery.hh"
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38 #ifndef HB_NO_SHAPER
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40 /**
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41 * SECTION:hb-shape
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42 * @title: hb-shape
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43 * @short_description: Conversion of text strings into positioned glyphs
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44 * @include: hb.h
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45 *
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46 * Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
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47 * which are sequences of Unicode characters that use the same font and have
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48 * the same text direction, script, and language. After shaping the buffer
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49 * contains the output glyphs and their positions.
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50 **/
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51
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52
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53 static inline void free_static_shaper_list ();
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54
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55 static const char * const nil_shaper_list[] = {nullptr};
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56
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57 static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
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58 hb_shaper_list_lazy_loader_t>
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59 {
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60 static const char ** create ()
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61 {
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62 const char **shaper_list = (const char **) hb_calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
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63 if (unlikely (!shaper_list))
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64 return nullptr;
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65
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66 const hb_shaper_entry_t *shapers = _hb_shapers_get ();
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67 unsigned int i;
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68 for (i = 0; i < HB_SHAPERS_COUNT; i++)
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69 shaper_list[i] = shapers[i].name;
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70 shaper_list[i] = nullptr;
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72 hb_atexit (free_static_shaper_list);
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74 return shaper_list;
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75 }
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76 static void destroy (const char **l)
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77 { hb_free (l); }
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78 static const char * const * get_null ()
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79 { return nil_shaper_list; }
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80 } static_shaper_list;
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81
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82 static inline
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83 void free_static_shaper_list ()
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84 {
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85 static_shaper_list.free_instance ();
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86 }
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87
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89 /**
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90 * hb_shape_list_shapers:
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91 *
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92 * Retrieves the list of shapers supported by HarfBuzz.
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93 *
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94 * Return value: (transfer none) (array zero-terminated=1): an array of
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95 * constant strings
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96 *
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97 * Since: 0.9.2
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98 **/
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99 const char **
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100 hb_shape_list_shapers ()
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101 {
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102 return static_shaper_list.get_unconst ();
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103 }
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104
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105
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106 /**
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107 * hb_shape_full:
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108 * @font: an #hb_font_t to use for shaping
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109 * @buffer: an #hb_buffer_t to shape
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110 * @features: (array length=num_features) (nullable): an array of user
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111 * specified #hb_feature_t or `NULL`
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112 * @num_features: the length of @features array
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113 * @shaper_list: (array zero-terminated=1) (nullable): a `NULL`-terminated
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114 * array of shapers to use or `NULL`
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115 *
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116 * See hb_shape() for details. If @shaper_list is not `NULL`, the specified
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117 * shapers will be used in the given order, otherwise the default shapers list
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118 * will be used.
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119 *
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120 * Return value: false if all shapers failed, true otherwise
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121 *
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122 * Since: 0.9.2
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123 **/
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124 hb_bool_t
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125 hb_shape_full (hb_font_t *font,
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126 hb_buffer_t *buffer,
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127 const hb_feature_t *features,
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128 unsigned int num_features,
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129 const char * const *shaper_list)
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130 {
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131 if (unlikely (!buffer->len))
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132 return true;
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133
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134 buffer->enter ();
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135
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136 hb_buffer_t *text_buffer = nullptr;
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137 if (buffer->flags & HB_BUFFER_FLAG_VERIFY)
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138 {
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139 text_buffer = hb_buffer_create ();
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140 hb_buffer_append (text_buffer, buffer, 0, -1);
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141 }
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142
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143 hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached2 (font->face, &buffer->props,
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144 features, num_features,
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145 font->coords, font->num_coords,
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146 shaper_list);
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147
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148 hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features);
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149
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150 if (buffer->max_ops <= 0)
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151 buffer->shaping_failed = true;
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152
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153 hb_shape_plan_destroy (shape_plan);
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154
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155 if (text_buffer)
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156 {
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157 if (res && buffer->successful && !buffer->shaping_failed
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158 && text_buffer->successful
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159 && !buffer->verify (text_buffer,
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160 font,
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161 features,
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162 num_features,
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163 shaper_list))
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164 res = false;
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165 hb_buffer_destroy (text_buffer);
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166 }
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167
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168 buffer->leave ();
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169
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170 return res;
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171 }
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172
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173 /**
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174 * hb_shape:
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175 * @font: an #hb_font_t to use for shaping
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176 * @buffer: an #hb_buffer_t to shape
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177 * @features: (array length=num_features) (nullable): an array of user
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178 * specified #hb_feature_t or `NULL`
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179 * @num_features: the length of @features array
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180 *
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181 * Shapes @buffer using @font turning its Unicode characters content to
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182 * positioned glyphs. If @features is not `NULL`, it will be used to control the
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183 * features applied during shaping. If two @features have the same tag but
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184 * overlapping ranges the value of the feature with the higher index takes
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185 * precedence.
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186 *
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187 * Since: 0.9.2
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188 **/
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diff changeset
189 void
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diff changeset
190 hb_shape (hb_font_t *font,
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diff changeset
191 hb_buffer_t *buffer,
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diff changeset
192 const hb_feature_t *features,
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diff changeset
193 unsigned int num_features)
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194 {
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195 hb_shape_full (font, buffer, features, num_features, nullptr);
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196 }
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197
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198
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199 #endif