hb-aat-map.hh (3512B)
1 /* 2 * Copyright © 2018 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #ifndef HB_AAT_MAP_HH 28 #define HB_AAT_MAP_HH 29 30 #include "hb.hh" 31 32 33 struct hb_aat_map_t 34 { 35 friend struct hb_aat_map_builder_t; 36 37 public: 38 struct range_flags_t 39 { 40 hb_mask_t flags; 41 unsigned cluster_first; 42 unsigned cluster_last; // end - 1 43 }; 44 45 public: 46 hb_vector_t<hb_sorted_vector_t<range_flags_t>> chain_flags; 47 }; 48 49 struct hb_aat_map_builder_t 50 { 51 public: 52 53 HB_INTERNAL hb_aat_map_builder_t (hb_face_t *face_, 54 const hb_segment_properties_t props_) : 55 face (face_), 56 props (props_) {} 57 58 HB_INTERNAL void add_feature (const hb_feature_t &feature); 59 60 HB_INTERNAL void compile (hb_aat_map_t &m); 61 62 public: 63 struct feature_info_t 64 { 65 hb_aat_layout_feature_type_t type; 66 hb_aat_layout_feature_selector_t setting; 67 bool is_exclusive; 68 unsigned seq; /* For stable sorting only. */ 69 70 HB_INTERNAL static int cmp (const void *pa, const void *pb) 71 { 72 const feature_info_t *a = (const feature_info_t *) pa; 73 const feature_info_t *b = (const feature_info_t *) pb; 74 if (a->type != b->type) return (a->type < b->type ? -1 : 1); 75 if (!a->is_exclusive && 76 (a->setting & ~1) != (b->setting & ~1)) return (a->setting < b->setting ? -1 : 1); 77 return (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0); 78 } 79 80 /* compares type & setting only */ 81 int cmp (const feature_info_t& f) const 82 { 83 return (f.type != type) ? (f.type < type ? -1 : 1) : 84 (f.setting != setting) ? (f.setting < setting ? -1 : 1) : 0; 85 } 86 }; 87 88 struct feature_range_t 89 { 90 feature_info_t info; 91 unsigned start; 92 unsigned end; 93 }; 94 95 private: 96 struct feature_event_t 97 { 98 unsigned int index; 99 bool start; 100 feature_info_t feature; 101 102 HB_INTERNAL static int cmp (const void *pa, const void *pb) { 103 const feature_event_t *a = (const feature_event_t *) pa; 104 const feature_event_t *b = (const feature_event_t *) pb; 105 return a->index < b->index ? -1 : a->index > b->index ? 1 : 106 a->start < b->start ? -1 : a->start > b->start ? 1 : 107 feature_info_t::cmp (&a->feature, &b->feature); 108 } 109 }; 110 111 public: 112 hb_face_t *face; 113 hb_segment_properties_t props; 114 115 public: 116 hb_sorted_vector_t<feature_range_t> features; 117 hb_sorted_vector_t<feature_info_t> current_features; 118 unsigned range_first = HB_FEATURE_GLOBAL_START; 119 unsigned range_last = HB_FEATURE_GLOBAL_END; 120 }; 121 122 123 #endif /* HB_AAT_MAP_HH */