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annotate mupdf-source/thirdparty/harfbuzz/src/hb-aat-layout-feat-table.hh @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright © 2018 Ebrahim Byagowi
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 */
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25 #ifndef HB_AAT_LAYOUT_FEAT_TABLE_HH
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26 #define HB_AAT_LAYOUT_FEAT_TABLE_HH
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28 #include "hb-aat-layout-common.hh"
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30 /*
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31 * feat -- Feature Name
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32 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6feat.html
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33 */
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34 #define HB_AAT_TAG_feat HB_TAG('f','e','a','t')
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37 namespace AAT {
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40 struct SettingName
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41 {
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42 friend struct FeatureName;
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44 int cmp (hb_aat_layout_feature_selector_t key) const
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45 { return (int) key - (int) setting; }
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47 hb_aat_layout_feature_selector_t get_selector () const
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48 { return (hb_aat_layout_feature_selector_t) (unsigned) setting; }
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50 hb_aat_layout_feature_selector_info_t get_info (hb_aat_layout_feature_selector_t default_selector) const
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51 {
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52 return {
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53 nameIndex,
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54 (hb_aat_layout_feature_selector_t) (unsigned int) setting,
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55 default_selector == HB_AAT_LAYOUT_FEATURE_SELECTOR_INVALID
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56 ? (hb_aat_layout_feature_selector_t) (setting + 1)
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57 : default_selector,
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58 0
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59 };
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60 }
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61
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62 bool sanitize (hb_sanitize_context_t *c) const
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63 {
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64 TRACE_SANITIZE (this);
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65 return_trace (c->check_struct (this));
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66 }
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68 protected:
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69 HBUINT16 setting; /* The setting. */
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70 NameID nameIndex; /* The name table index for the setting's name. */
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71 public:
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72 DEFINE_SIZE_STATIC (4);
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73 };
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74 DECLARE_NULL_NAMESPACE_BYTES (AAT, SettingName);
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76 struct feat;
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78 struct FeatureName
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79 {
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80 int cmp (hb_aat_layout_feature_type_t key) const
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81 { return (int) key - (int) feature; }
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82
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83 enum {
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84 Exclusive = 0x8000, /* If set, the feature settings are mutually exclusive. */
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85 NotDefault = 0x4000, /* If clear, then the setting with an index of 0 in
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86 * the setting name array for this feature should
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87 * be taken as the default for the feature
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88 * (if one is required). If set, then bits 0-15 of this
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89 * featureFlags field contain the index of the setting
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90 * which is to be taken as the default. */
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91 IndexMask = 0x00FF /* If bits 30 and 31 are set, then these sixteen bits
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92 * indicate the index of the setting in the setting name
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93 * array for this feature which should be taken
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94 * as the default. */
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95 };
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96
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97 unsigned int get_selector_infos (unsigned int start_offset,
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98 unsigned int *selectors_count, /* IN/OUT. May be NULL. */
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99 hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
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100 unsigned int *pdefault_index, /* OUT. May be NULL. */
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101 const void *base) const
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102 {
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103 hb_array_t< const SettingName> settings_table = (base+settingTableZ).as_array (nSettings);
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104
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105 static_assert (Index::NOT_FOUND_INDEX == HB_AAT_LAYOUT_NO_SELECTOR_INDEX, "");
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106
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107 hb_aat_layout_feature_selector_t default_selector = HB_AAT_LAYOUT_FEATURE_SELECTOR_INVALID;
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108 unsigned int default_index = Index::NOT_FOUND_INDEX;
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109 if (featureFlags & Exclusive)
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110 {
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111 default_index = (featureFlags & NotDefault) ? featureFlags & IndexMask : 0;
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112 default_selector = settings_table[default_index].get_selector ();
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113 }
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114 if (pdefault_index)
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115 *pdefault_index = default_index;
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116
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117 if (selectors_count)
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118 {
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119 + settings_table.sub_array (start_offset, selectors_count)
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120 | hb_map ([=] (const SettingName& setting) { return setting.get_info (default_selector); })
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121 | hb_sink (hb_array (selectors, *selectors_count))
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122 ;
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123 }
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124 return settings_table.length;
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125 }
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126
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127 hb_aat_layout_feature_type_t get_feature_type () const
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128 { return (hb_aat_layout_feature_type_t) (unsigned int) feature; }
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129
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130 hb_ot_name_id_t get_feature_name_id () const { return nameIndex; }
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131
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132 bool is_exclusive () const { return featureFlags & Exclusive; }
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133
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134 /* A FeatureName with no settings is meaningless */
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135 bool has_data () const { return nSettings; }
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136
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137 bool sanitize (hb_sanitize_context_t *c, const void *base) const
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138 {
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139 TRACE_SANITIZE (this);
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140 return_trace (likely (c->check_struct (this) &&
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141 (base+settingTableZ).sanitize (c, nSettings)));
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142 }
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143
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144 protected:
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145 HBUINT16 feature; /* Feature type. */
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146 HBUINT16 nSettings; /* The number of records in the setting name array. */
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147 NNOffset32To<UnsizedArrayOf<SettingName>>
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148 settingTableZ; /* Offset in bytes from the beginning of this table to
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149 * this feature's setting name array. The actual type of
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150 * record this offset refers to will depend on the
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151 * exclusivity value, as described below. */
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152 HBUINT16 featureFlags; /* Single-bit flags associated with the feature type. */
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153 HBINT16 nameIndex; /* The name table index for the feature's name.
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154 * This index has values greater than 255 and
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155 * less than 32768. */
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156 public:
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157 DEFINE_SIZE_STATIC (12);
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158 };
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159
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160 struct feat
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161 {
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162 static constexpr hb_tag_t tableTag = HB_AAT_TAG_feat;
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163
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164 bool has_data () const { return version.to_int (); }
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165
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166 unsigned int get_feature_types (unsigned int start_offset,
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167 unsigned int *count,
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168 hb_aat_layout_feature_type_t *features) const
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169 {
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170 if (count)
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171 {
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172 + namesZ.as_array (featureNameCount).sub_array (start_offset, count)
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173 | hb_map (&FeatureName::get_feature_type)
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174 | hb_sink (hb_array (features, *count))
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175 ;
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176 }
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177 return featureNameCount;
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178 }
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179
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180 bool exposes_feature (hb_aat_layout_feature_type_t feature_type) const
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181 { return get_feature (feature_type).has_data (); }
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182
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183 const FeatureName& get_feature (hb_aat_layout_feature_type_t feature_type) const
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184 { return namesZ.bsearch (featureNameCount, feature_type); }
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185
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186 hb_ot_name_id_t get_feature_name_id (hb_aat_layout_feature_type_t feature) const
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187 { return get_feature (feature).get_feature_name_id (); }
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188
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189 unsigned int get_selector_infos (hb_aat_layout_feature_type_t feature_type,
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190 unsigned int start_offset,
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191 unsigned int *selectors_count, /* IN/OUT. May be NULL. */
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192 hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
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193 unsigned int *default_index /* OUT. May be NULL. */) const
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194 {
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195 return get_feature (feature_type).get_selector_infos (start_offset, selectors_count, selectors,
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196 default_index, this);
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197 }
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198
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199 bool sanitize (hb_sanitize_context_t *c) const
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200 {
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201 TRACE_SANITIZE (this);
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202 return_trace (likely (c->check_struct (this) &&
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203 version.major == 1 &&
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204 namesZ.sanitize (c, featureNameCount, this)));
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205 }
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206
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207 protected:
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208 FixedVersion<>version; /* Version number of the feature name table
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209 * (0x00010000 for the current version). */
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210 HBUINT16 featureNameCount;
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211 /* The number of entries in the feature name array. */
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212 HBUINT16 reserved1; /* Reserved (set to zero). */
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213 HBUINT32 reserved2; /* Reserved (set to zero). */
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214 SortedUnsizedArrayOf<FeatureName>
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215 namesZ; /* The feature name array. */
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216 public:
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217 DEFINE_SIZE_ARRAY (12, namesZ);
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218 };
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219
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220 } /* namespace AAT */
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221
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222 #endif /* HB_AAT_LAYOUT_FEAT_TABLE_HH */