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comparison: gfx/harfbuzz/src/hb-ot-map-private.hh
gfx/harfbuzz/src/hb-ot-map-private.hh
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- TOR_BUG_9701
- changeset 14
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| -1:000000000000 | 0:bcee0812d928 |
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| 1 /* | |
| 2 * Copyright © 2009,2010 Red Hat, Inc. | |
| 3 * Copyright © 2010,2011,2012,2013 Google, Inc. | |
| 4 * | |
| 5 * This is part of HarfBuzz, a text shaping library. | |
| 6 * | |
| 7 * Permission is hereby granted, without written agreement and without | |
| 8 * license or royalty fees, to use, copy, modify, and distribute this | |
| 9 * software and its documentation for any purpose, provided that the | |
| 10 * above copyright notice and the following two paragraphs appear in | |
| 11 * all copies of this software. | |
| 12 * | |
| 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | |
| 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
| 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | |
| 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
| 17 * DAMAGE. | |
| 18 * | |
| 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | |
| 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | |
| 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | |
| 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | |
| 24 * | |
| 25 * Red Hat Author(s): Behdad Esfahbod | |
| 26 * Google Author(s): Behdad Esfahbod | |
| 27 */ | |
| 28 | |
| 29 #ifndef HB_OT_MAP_PRIVATE_HH | |
| 30 #define HB_OT_MAP_PRIVATE_HH | |
| 31 | |
| 32 #include "hb-buffer-private.hh" | |
| 33 | |
| 34 | |
| 35 struct hb_ot_shape_plan_t; | |
| 36 | |
| 37 static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS}; | |
| 38 | |
| 39 struct hb_ot_map_t | |
| 40 { | |
| 41 friend struct hb_ot_map_builder_t; | |
| 42 | |
| 43 public: | |
| 44 | |
| 45 struct feature_map_t { | |
| 46 hb_tag_t tag; /* should be first for our bsearch to work */ | |
| 47 unsigned int index[2]; /* GSUB/GPOS */ | |
| 48 unsigned int stage[2]; /* GSUB/GPOS */ | |
| 49 unsigned int shift; | |
| 50 hb_mask_t mask; | |
| 51 hb_mask_t _1_mask; /* mask for value=1, for quick access */ | |
| 52 unsigned int needs_fallback : 1; | |
| 53 unsigned int auto_zwj : 1; | |
| 54 | |
| 55 static int cmp (const feature_map_t *a, const feature_map_t *b) | |
| 56 { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; } | |
| 57 }; | |
| 58 | |
| 59 struct lookup_map_t { | |
| 60 unsigned short index; | |
| 61 unsigned short auto_zwj : 1; | |
| 62 hb_mask_t mask; | |
| 63 | |
| 64 static int cmp (const lookup_map_t *a, const lookup_map_t *b) | |
| 65 { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; } | |
| 66 }; | |
| 67 | |
| 68 typedef void (*pause_func_t) (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer); | |
| 69 | |
| 70 struct stage_map_t { | |
| 71 unsigned int last_lookup; /* Cumulative */ | |
| 72 pause_func_t pause_func; | |
| 73 }; | |
| 74 | |
| 75 | |
| 76 hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); } | |
| 77 | |
| 78 inline hb_mask_t get_global_mask (void) const { return global_mask; } | |
| 79 | |
| 80 inline hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = NULL) const { | |
| 81 const feature_map_t *map = features.bsearch (&feature_tag); | |
| 82 if (shift) *shift = map ? map->shift : 0; | |
| 83 return map ? map->mask : 0; | |
| 84 } | |
| 85 | |
| 86 inline bool needs_fallback (hb_tag_t feature_tag) const { | |
| 87 const feature_map_t *map = features.bsearch (&feature_tag); | |
| 88 return map ? map->needs_fallback : false; | |
| 89 } | |
| 90 | |
| 91 inline hb_mask_t get_1_mask (hb_tag_t feature_tag) const { | |
| 92 const feature_map_t *map = features.bsearch (&feature_tag); | |
| 93 return map ? map->_1_mask : 0; | |
| 94 } | |
| 95 | |
| 96 inline unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const { | |
| 97 const feature_map_t *map = features.bsearch (&feature_tag); | |
| 98 return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX; | |
| 99 } | |
| 100 | |
| 101 inline unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const { | |
| 102 const feature_map_t *map = features.bsearch (&feature_tag); | |
| 103 return map ? map->stage[table_index] : (unsigned int) -1; | |
| 104 } | |
| 105 | |
| 106 inline void get_stage_lookups (unsigned int table_index, unsigned int stage, | |
| 107 const struct lookup_map_t **plookups, unsigned int *lookup_count) const { | |
| 108 if (unlikely (stage == (unsigned int) -1)) { | |
| 109 *plookups = NULL; | |
| 110 *lookup_count = 0; | |
| 111 return; | |
| 112 } | |
| 113 assert (stage <= stages[table_index].len); | |
| 114 unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0; | |
| 115 unsigned int end = stage < stages[table_index].len ? stages[table_index][stage].last_lookup : lookups[table_index].len; | |
| 116 *plookups = &lookups[table_index][start]; | |
| 117 *lookup_count = end - start; | |
| 118 } | |
| 119 | |
| 120 HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const; | |
| 121 template <typename Proxy> | |
| 122 HB_INTERNAL inline void apply (const Proxy &proxy, | |
| 123 const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const; | |
| 124 HB_INTERNAL void substitute (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const; | |
| 125 HB_INTERNAL void position (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const; | |
| 126 | |
| 127 inline void finish (void) { | |
| 128 features.finish (); | |
| 129 for (unsigned int table_index = 0; table_index < 2; table_index++) | |
| 130 { | |
| 131 lookups[table_index].finish (); | |
| 132 stages[table_index].finish (); | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 public: | |
| 137 hb_tag_t chosen_script[2]; | |
| 138 bool found_script[2]; | |
| 139 | |
| 140 private: | |
| 141 | |
| 142 HB_INTERNAL void add_lookups (hb_face_t *face, | |
| 143 unsigned int table_index, | |
| 144 unsigned int feature_index, | |
| 145 hb_mask_t mask, | |
| 146 bool auto_zwj); | |
| 147 | |
| 148 hb_mask_t global_mask; | |
| 149 | |
| 150 hb_prealloced_array_t<feature_map_t, 8> features; | |
| 151 hb_prealloced_array_t<lookup_map_t, 32> lookups[2]; /* GSUB/GPOS */ | |
| 152 hb_prealloced_array_t<stage_map_t, 4> stages[2]; /* GSUB/GPOS */ | |
| 153 }; | |
| 154 | |
| 155 enum hb_ot_map_feature_flags_t { | |
| 156 F_NONE = 0x0000, | |
| 157 F_GLOBAL = 0x0001, | |
| 158 F_HAS_FALLBACK = 0x0002, | |
| 159 F_MANUAL_ZWJ = 0x0004 | |
| 160 }; | |
| 161 /* Macro version for where const is desired. */ | |
| 162 #define F_COMBINE(l,r) (hb_ot_map_feature_flags_t ((unsigned int) (l) | (unsigned int) (r))) | |
| 163 inline hb_ot_map_feature_flags_t | |
| 164 operator | (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r) | |
| 165 { return hb_ot_map_feature_flags_t ((unsigned int) l | (unsigned int) r); } | |
| 166 inline hb_ot_map_feature_flags_t | |
| 167 operator & (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r) | |
| 168 { return hb_ot_map_feature_flags_t ((unsigned int) l & (unsigned int) r); } | |
| 169 inline hb_ot_map_feature_flags_t | |
| 170 operator ~ (hb_ot_map_feature_flags_t r) | |
| 171 { return hb_ot_map_feature_flags_t (~(unsigned int) r); } | |
| 172 inline hb_ot_map_feature_flags_t& | |
| 173 operator |= (hb_ot_map_feature_flags_t &l, hb_ot_map_feature_flags_t r) | |
| 174 { l = l | r; return l; } | |
| 175 inline hb_ot_map_feature_flags_t& | |
| 176 operator &= (hb_ot_map_feature_flags_t& l, hb_ot_map_feature_flags_t r) | |
| 177 { l = l & r; return l; } | |
| 178 | |
| 179 | |
| 180 struct hb_ot_map_builder_t | |
| 181 { | |
| 182 public: | |
| 183 | |
| 184 HB_INTERNAL hb_ot_map_builder_t (hb_face_t *face_, | |
| 185 const hb_segment_properties_t *props_); | |
| 186 | |
| 187 HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, | |
| 188 hb_ot_map_feature_flags_t flags); | |
| 189 | |
| 190 inline void add_global_bool_feature (hb_tag_t tag) | |
| 191 { add_feature (tag, 1, F_GLOBAL); } | |
| 192 | |
| 193 inline void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func) | |
| 194 { add_pause (0, pause_func); } | |
| 195 inline void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func) | |
| 196 { add_pause (1, pause_func); } | |
| 197 | |
| 198 HB_INTERNAL void compile (struct hb_ot_map_t &m); | |
| 199 | |
| 200 inline void finish (void) { | |
| 201 feature_infos.finish (); | |
| 202 for (unsigned int table_index = 0; table_index < 2; table_index++) | |
| 203 { | |
| 204 stages[table_index].finish (); | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 private: | |
| 209 | |
| 210 struct feature_info_t { | |
| 211 hb_tag_t tag; | |
| 212 unsigned int seq; /* sequence#, used for stable sorting only */ | |
| 213 unsigned int max_value; | |
| 214 hb_ot_map_feature_flags_t flags; | |
| 215 unsigned int default_value; /* for non-global features, what should the unset glyphs take */ | |
| 216 unsigned int stage[2]; /* GSUB/GPOS */ | |
| 217 | |
| 218 static int cmp (const feature_info_t *a, const feature_info_t *b) | |
| 219 { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); } | |
| 220 }; | |
| 221 | |
| 222 struct stage_info_t { | |
| 223 unsigned int index; | |
| 224 hb_ot_map_t::pause_func_t pause_func; | |
| 225 }; | |
| 226 | |
| 227 HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func); | |
| 228 | |
| 229 public: | |
| 230 | |
| 231 hb_face_t *face; | |
| 232 hb_segment_properties_t props; | |
| 233 | |
| 234 hb_tag_t chosen_script[2]; | |
| 235 bool found_script[2]; | |
| 236 unsigned int script_index[2], language_index[2]; | |
| 237 | |
| 238 private: | |
| 239 | |
| 240 unsigned int current_stage[2]; /* GSUB/GPOS */ | |
| 241 hb_prealloced_array_t<feature_info_t, 32> feature_infos; | |
| 242 hb_prealloced_array_t<stage_info_t, 8> stages[2]; /* GSUB/GPOS */ | |
| 243 }; | |
| 244 | |
| 245 | |
| 246 | |
| 247 #endif /* HB_OT_MAP_PRIVATE_HH */ |
