hb-ot-map-private.hh revision 852912fc2db06b6183a2dc87c45ec1b563063572
1/* 2 * Copyright (C) 2009,2010 Red Hat, Inc. 3 * Copyright (C) 2010 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 36HB_BEGIN_DECLS 37 38 39#define MAX_FEATURES 100 /* FIXME */ 40#define MAX_LOOKUPS 1000 /* FIXME */ 41 42static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS}; 43 44struct hb_ot_map_t { 45 46 private: 47 48 struct feature_info_t { 49 hb_tag_t tag; 50 unsigned int seq; /* sequence#, used for stable sorting only */ 51 unsigned int max_value; 52 bool global; /* whether the feature applies value to every glyph in the buffer */ 53 unsigned int default_value; /* for non-global features, what should the unset glyphs take */ 54 55 static int cmp (const feature_info_t *a, const feature_info_t *b) 56 { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); } 57 }; 58 59 struct feature_map_t { 60 hb_tag_t tag; /* should be first for our bsearch to work */ 61 unsigned int index[2]; /* GSUB, GPOS */ 62 unsigned int shift; 63 hb_mask_t mask; 64 65 static int cmp (const feature_map_t *a, const feature_map_t *b) 66 { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; } 67 }; 68 69 struct lookup_map_t { 70 unsigned int index; 71 hb_mask_t mask; 72 73 static int cmp (const lookup_map_t *a, const lookup_map_t *b) 74 { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; } 75 }; 76 77 HB_INTERNAL void add_lookups (hb_face_t *face, 78 unsigned int table_index, 79 unsigned int feature_index, 80 hb_mask_t mask); 81 82 83 public: 84 85 hb_ot_map_t (void) : feature_count (0) {} 86 87 void add_feature (hb_tag_t tag, unsigned int value, bool global) 88 { 89 feature_info_t *info = &feature_infos[feature_count++]; 90 info->tag = tag; 91 info->seq = feature_count; 92 info->max_value = value; 93 info->global = global; 94 info->default_value = global ? value : 0; 95 } 96 97 inline void add_bool_feature (hb_tag_t tag, bool global = true) 98 { add_feature (tag, 1, global); } 99 100 HB_INTERNAL void compile (hb_face_t *face, 101 const hb_segment_properties_t *props); 102 103 hb_mask_t get_global_mask (void) const { return global_mask; } 104 105 hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const { 106 const feature_map_t *map = (const feature_map_t *) bsearch (&tag, feature_maps, feature_count, sizeof (feature_maps[0]), (hb_compare_func_t) feature_map_t::cmp); 107 if (shift) *shift = map ? map->shift : 0; 108 return map ? map->mask : 0; 109 } 110 111 inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const { 112 for (unsigned int i = 0; i < lookup_count[0]; i++) 113 hb_ot_layout_substitute_lookup (face, buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask); 114 } 115 116 inline void position (hb_font_t *font, hb_face_t *face, hb_buffer_t *buffer) const { 117 for (unsigned int i = 0; i < lookup_count[1]; i++) 118 hb_ot_layout_position_lookup (font, face, buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask); 119 } 120 121 private: 122 123 hb_mask_t global_mask; 124 125 unsigned int feature_count; 126 feature_info_t feature_infos[MAX_FEATURES]; /* used before compile() only */ 127 feature_map_t feature_maps[MAX_FEATURES]; 128 129 lookup_map_t lookup_maps[2][MAX_LOOKUPS]; /* GSUB/GPOS */ 130 unsigned int lookup_count[2]; 131}; 132 133 134 135HB_END_DECLS 136 137#endif /* HB_OT_MAP_PRIVATE_HH */ 138