Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-map.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /*
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2 * Copyright © 2009,2010 Red Hat, Inc.
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3 * Copyright © 2010,2011,2012,2013 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 #ifndef HB_OT_MAP_HH
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30 #define HB_OT_MAP_HH
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32 #include "hb-buffer.hh"
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35 #define HB_OT_MAP_MAX_BITS 8u
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36 #define HB_OT_MAP_MAX_VALUE ((1u << HB_OT_MAP_MAX_BITS) - 1u)
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38 struct hb_ot_shape_plan_t;
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40 static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
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42 struct hb_ot_map_t
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43 {
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44 friend struct hb_ot_map_builder_t;
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46 public:
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47
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48 struct feature_map_t {
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49 hb_tag_t tag; /* should be first for our bsearch to work */
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50 unsigned int index[2]; /* GSUB/GPOS */
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51 unsigned int stage[2]; /* GSUB/GPOS */
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52 unsigned int shift;
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53 hb_mask_t mask;
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54 hb_mask_t _1_mask; /* mask for value=1, for quick access */
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55 unsigned int needs_fallback : 1;
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56 unsigned int auto_zwnj : 1;
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57 unsigned int auto_zwj : 1;
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58 unsigned int random : 1;
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59 unsigned int per_syllable : 1;
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60
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61 int cmp (const hb_tag_t tag_) const
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62 { return tag_ < tag ? -1 : tag_ > tag ? 1 : 0; }
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63 };
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65 struct lookup_map_t {
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66 unsigned short index;
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67 unsigned short auto_zwnj : 1;
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68 unsigned short auto_zwj : 1;
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69 unsigned short random : 1;
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70 unsigned short per_syllable : 1;
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71 hb_mask_t mask;
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72 hb_tag_t feature_tag;
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73
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74 HB_INTERNAL static int cmp (const void *pa, const void *pb)
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75 {
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76 const lookup_map_t *a = (const lookup_map_t *) pa;
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77 const lookup_map_t *b = (const lookup_map_t *) pb;
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78 return a->index < b->index ? -1 : a->index > b->index ? 1 : 0;
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79 }
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80 };
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81
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82 /* Pause functions return true if new glyph indices might have been
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83 * added to the buffer. This is used to update buffer digest. */
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84 typedef bool (*pause_func_t) (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer);
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86 struct stage_map_t {
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87 unsigned int last_lookup; /* Cumulative */
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88 pause_func_t pause_func;
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89 };
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90
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91 void init ()
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92 {
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93 hb_memset (this, 0, sizeof (*this));
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95 features.init0 ();
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96 for (unsigned int table_index = 0; table_index < 2; table_index++)
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97 {
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98 lookups[table_index].init0 ();
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99 stages[table_index].init0 ();
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100 }
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101 }
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102 void fini ()
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103 {
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104 features.fini ();
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diff changeset
105 for (unsigned int table_index = 0; table_index < 2; table_index++)
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106 {
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107 lookups[table_index].fini ();
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diff changeset
108 stages[table_index].fini ();
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109 }
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110 }
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111
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112 hb_mask_t get_global_mask () const { return global_mask; }
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113
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114 hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = nullptr) const
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115 {
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116 const feature_map_t *map = features.bsearch (feature_tag);
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117 if (shift) *shift = map ? map->shift : 0;
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118 return map ? map->mask : 0;
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119 }
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120
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121 bool needs_fallback (hb_tag_t feature_tag) const
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122 {
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123 const feature_map_t *map = features.bsearch (feature_tag);
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124 return map ? map->needs_fallback : false;
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125 }
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126
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127 hb_mask_t get_1_mask (hb_tag_t feature_tag) const
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128 {
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129 const feature_map_t *map = features.bsearch (feature_tag);
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130 return map ? map->_1_mask : 0;
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131 }
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132
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133 unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const
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134 {
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135 const feature_map_t *map = features.bsearch (feature_tag);
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136 return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX;
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137 }
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138
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139 unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const
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140 {
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141 const feature_map_t *map = features.bsearch (feature_tag);
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142 return map ? map->stage[table_index] : UINT_MAX;
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143 }
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144
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145 hb_array_t<const hb_ot_map_t::lookup_map_t>
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146 get_stage_lookups (unsigned int table_index, unsigned int stage) const
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147 {
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148 if (unlikely (stage > stages[table_index].length))
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149 return hb_array<const hb_ot_map_t::lookup_map_t> (nullptr, 0);
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150
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151 unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0;
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152 unsigned int end = stage < stages[table_index].length ? stages[table_index][stage].last_lookup : lookups[table_index].length;
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153 return lookups[table_index].as_array ().sub_array (start, end - start);
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154 }
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155
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diff changeset
156 HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const;
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diff changeset
157 template <typename Proxy>
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158 HB_INTERNAL void apply (const Proxy &proxy,
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diff changeset
159 const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
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diff changeset
160 HB_INTERNAL void substitute (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
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diff changeset
161 HB_INTERNAL void position (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
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162
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diff changeset
163 public:
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parents:
diff changeset
164 hb_tag_t chosen_script[2];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 bool found_script[2];
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166
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diff changeset
167 private:
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168
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diff changeset
169 hb_mask_t global_mask = 0;
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170
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diff changeset
171 hb_sorted_vector_t<feature_map_t> features;
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parents:
diff changeset
172 hb_vector_t<lookup_map_t> lookups[2]; /* GSUB/GPOS */
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diff changeset
173 hb_vector_t<stage_map_t> stages[2]; /* GSUB/GPOS */
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diff changeset
174 };
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175
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parents:
diff changeset
176 enum hb_ot_map_feature_flags_t
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diff changeset
177 {
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diff changeset
178 F_NONE = 0x0000u,
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diff changeset
179 F_GLOBAL = 0x0001u, /* Feature applies to all characters; results in no mask allocated for it. */
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parents:
diff changeset
180 F_HAS_FALLBACK = 0x0002u, /* Has fallback implementation, so include mask bit even if feature not found. */
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diff changeset
181 F_MANUAL_ZWNJ = 0x0004u, /* Don't skip over ZWNJ when matching **context**. */
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parents:
diff changeset
182 F_MANUAL_ZWJ = 0x0008u, /* Don't skip over ZWJ when matching **input**. */
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parents:
diff changeset
183 F_MANUAL_JOINERS = F_MANUAL_ZWNJ | F_MANUAL_ZWJ,
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diff changeset
184 F_GLOBAL_MANUAL_JOINERS= F_GLOBAL | F_MANUAL_JOINERS,
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diff changeset
185 F_GLOBAL_HAS_FALLBACK = F_GLOBAL | F_HAS_FALLBACK,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 F_GLOBAL_SEARCH = 0x0010u, /* If feature not found in LangSys, look for it in global feature list and pick one. */
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parents:
diff changeset
187 F_RANDOM = 0x0020u, /* Randomly select a glyph from an AlternateSubstFormat1 subtable. */
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parents:
diff changeset
188 F_PER_SYLLABLE = 0x0040u /* Contain lookup application to within syllable. */
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diff changeset
189 };
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parents:
diff changeset
190 HB_MARK_AS_FLAG_T (hb_ot_map_feature_flags_t);
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diff changeset
191
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diff changeset
192
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parents:
diff changeset
193 struct hb_ot_map_feature_t
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diff changeset
194 {
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parents:
diff changeset
195 hb_tag_t tag;
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196 hb_ot_map_feature_flags_t flags;
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197 };
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198
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199 struct hb_ot_shape_plan_key_t;
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200
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201 struct hb_ot_map_builder_t
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202 {
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203 public:
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204
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205 HB_INTERNAL hb_ot_map_builder_t (hb_face_t *face_,
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206 const hb_segment_properties_t &props_);
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207
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208 HB_INTERNAL ~hb_ot_map_builder_t ();
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209
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210 HB_INTERNAL void add_feature (hb_tag_t tag,
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211 hb_ot_map_feature_flags_t flags=F_NONE,
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212 unsigned int value=1);
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213
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214 HB_INTERNAL bool has_feature (hb_tag_t tag);
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215
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216 void add_feature (const hb_ot_map_feature_t &feat)
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217 { add_feature (feat.tag, feat.flags); }
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218
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219 void enable_feature (hb_tag_t tag,
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220 hb_ot_map_feature_flags_t flags=F_NONE,
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221 unsigned int value=1)
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222 { add_feature (tag, F_GLOBAL | flags, value); }
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223
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224 void disable_feature (hb_tag_t tag)
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225 { add_feature (tag, F_GLOBAL, 0); }
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226
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227 void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func)
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228 { add_pause (0, pause_func); }
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229 void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func)
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230 { add_pause (1, pause_func); }
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231
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232 HB_INTERNAL void compile (hb_ot_map_t &m,
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233 const hb_ot_shape_plan_key_t &key);
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234
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235 private:
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236
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237 HB_INTERNAL void add_lookups (hb_ot_map_t &m,
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238 unsigned int table_index,
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239 unsigned int feature_index,
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240 unsigned int variations_index,
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241 hb_mask_t mask,
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242 bool auto_zwnj = true,
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243 bool auto_zwj = true,
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244 bool random = false,
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245 bool per_syllable = false,
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246 hb_tag_t feature_tag = HB_TAG(' ',' ',' ',' '));
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247
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248 struct feature_info_t {
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249 hb_tag_t tag;
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250 unsigned int seq; /* sequence#, used for stable sorting only */
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251 unsigned int max_value;
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252 hb_ot_map_feature_flags_t flags;
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253 unsigned int default_value; /* for non-global features, what should the unset glyphs take */
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254 unsigned int stage[2]; /* GSUB/GPOS */
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255
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256 HB_INTERNAL static int cmp (const void *pa, const void *pb)
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257 {
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258 const feature_info_t *a = (const feature_info_t *) pa;
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259 const feature_info_t *b = (const feature_info_t *) pb;
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260 return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) :
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261 (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0);
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262 }
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263 };
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264
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diff changeset
265 struct stage_info_t {
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diff changeset
266 unsigned int index;
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diff changeset
267 hb_ot_map_t::pause_func_t pause_func;
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268 };
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269
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270 HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func);
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271
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272 public:
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273
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274 hb_face_t *face;
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275 hb_segment_properties_t props;
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276
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277 hb_tag_t chosen_script[2];
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diff changeset
278 bool found_script[2];
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279 unsigned int script_index[2], language_index[2];
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280
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281 private:
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282
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diff changeset
283 unsigned int current_stage[2]; /* GSUB/GPOS */
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284 hb_vector_t<feature_info_t> feature_infos;
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diff changeset
285 hb_vector_t<stage_info_t> stages[2]; /* GSUB/GPOS */
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diff changeset
286 };
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287
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288
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289
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diff changeset
290 #endif /* HB_OT_MAP_HH */