hb-ot-map-private.hh revision 6a9be5bd3524dc3eb1e88d1063bde2e4d8b57011
1/* 2 * Copyright © 2009,2010 Red Hat, Inc. 3 * Copyright © 2010,2011 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#include "hb-ot-layout.h" 35 36 37 38static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS}; 39 40struct hb_ot_map_t 41{ 42 friend struct hb_ot_map_builder_t; 43 44 public: 45 46 hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); } 47 48 typedef void (*gsub_pause_func_t) (const hb_ot_map_t *map, hb_face_t *face, hb_buffer_t *buffer, void *user_data); 49 typedef void (*gpos_pause_func_t) (const hb_ot_map_t *map, hb_font_t *font, hb_buffer_t *buffer, void *user_data); 50 51 inline hb_mask_t get_global_mask (void) const { return global_mask; } 52 53 inline hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const { 54 const feature_map_t *map = features.bsearch (&tag); 55 if (shift) *shift = map ? map->shift : 0; 56 return map ? map->mask : 0; 57 } 58 59 inline hb_mask_t get_1_mask (hb_tag_t tag) const { 60 const feature_map_t *map = features.bsearch (&tag); 61 return map ? map->_1_mask : 0; 62 } 63 64 inline hb_tag_t get_chosen_script (unsigned int table_index) const 65 { return chosen_script[table_index]; } 66 67 inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const 68 { apply (0, (hb_ot_map_t::apply_lookup_func_t) hb_ot_layout_substitute_lookup, face, buffer); } 69 inline void position (hb_font_t *font, hb_buffer_t *buffer) const 70 { apply (1, (hb_ot_map_t::apply_lookup_func_t) hb_ot_layout_position_lookup, font, buffer); } 71 72 inline void finish (void) { 73 features.finish (); 74 lookups[0].finish (); 75 lookups[1].finish (); 76 pauses[0].finish (); 77 pauses[1].finish (); 78 } 79 80 private: 81 82 struct feature_map_t { 83 hb_tag_t tag; /* should be first for our bsearch to work */ 84 unsigned int index[2]; /* GSUB/GPOS */ 85 unsigned int stage[2]; /* GSUB/GPOS */ 86 unsigned int shift; 87 hb_mask_t mask; 88 hb_mask_t _1_mask; /* mask for value=1, for quick access */ 89 90 static int cmp (const feature_map_t *a, const feature_map_t *b) 91 { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; } 92 }; 93 94 struct lookup_map_t { 95 unsigned int index; 96 hb_mask_t mask; 97 98 static int cmp (const lookup_map_t *a, const lookup_map_t *b) 99 { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; } 100 }; 101 102 typedef void (*pause_func_t) (const hb_ot_map_t *map, void *face_or_font, hb_buffer_t *buffer, void *user_data); 103 typedef struct { 104 pause_func_t func; 105 void *user_data; 106 } pause_callback_t; 107 108 struct pause_map_t { 109 unsigned int num_lookups; /* Cumulative */ 110 pause_callback_t callback; 111 }; 112 113 typedef hb_bool_t (*apply_lookup_func_t) (void *face_or_font, 114 hb_buffer_t *buffer, 115 unsigned int lookup_index, 116 hb_mask_t mask); 117 118 HB_INTERNAL void add_lookups (hb_face_t *face, 119 unsigned int table_index, 120 unsigned int feature_index, 121 hb_mask_t mask); 122 123 HB_INTERNAL void apply (unsigned int table_index, 124 hb_ot_map_t::apply_lookup_func_t apply_lookup_func, 125 void *face_or_font, 126 hb_buffer_t *buffer) const; 127 128 HB_INTERNAL void substitute_closure (hb_face_t *face, 129 hb_set_t *glyphs) const; 130 131 hb_mask_t global_mask; 132 133 hb_tag_t chosen_script[2]; 134 hb_prealloced_array_t<feature_map_t, 8> features; 135 hb_prealloced_array_t<lookup_map_t, 32> lookups[2]; /* GSUB/GPOS */ 136 hb_prealloced_array_t<pause_map_t, 1> pauses[2]; /* GSUB/GPOS */ 137}; 138 139 140struct hb_ot_map_builder_t 141{ 142 public: 143 144 hb_ot_map_builder_t (void) { memset (this, 0, sizeof (*this)); } 145 146 HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, bool global); 147 148 inline void add_bool_feature (hb_tag_t tag, bool global = true) 149 { add_feature (tag, 1, global); } 150 151 inline void add_gsub_pause (hb_ot_map_t::gsub_pause_func_t pause_func, void *user_data) 152 { add_pause (0, (hb_ot_map_t::pause_func_t) pause_func, user_data); } 153 inline void add_gpos_pause (hb_ot_map_t::gpos_pause_func_t pause_func, void *user_data) 154 { add_pause (1, (hb_ot_map_t::pause_func_t) pause_func, user_data); } 155 156 HB_INTERNAL void compile (hb_face_t *face, 157 const hb_segment_properties_t *props, 158 struct hb_ot_map_t &m); 159 160 inline void finish (void) { 161 feature_infos.finish (); 162 pauses[0].finish (); 163 pauses[1].finish (); 164 } 165 166 private: 167 168 struct feature_info_t { 169 hb_tag_t tag; 170 unsigned int seq; /* sequence#, used for stable sorting only */ 171 unsigned int max_value; 172 bool global; /* whether the feature applies value to every glyph in the buffer */ 173 unsigned int default_value; /* for non-global features, what should the unset glyphs take */ 174 unsigned int stage[2]; /* GSUB/GPOS */ 175 176 static int cmp (const feature_info_t *a, const feature_info_t *b) 177 { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); } 178 }; 179 180 struct pause_info_t { 181 unsigned int stage; 182 hb_ot_map_t::pause_callback_t callback; 183 }; 184 185 HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func, void *user_data); 186 187 unsigned int current_stage[2]; /* GSUB/GPOS */ 188 hb_prealloced_array_t<feature_info_t,16> feature_infos; 189 hb_prealloced_array_t<pause_info_t, 1> pauses[2]; /* GSUB/GPOS */ 190}; 191 192 193 194#endif /* HB_OT_MAP_PRIVATE_HH */ 195