hb-face.hh (3141B)
1 /* 2 * Copyright © 2009 Red Hat, Inc. 3 * Copyright © 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_FACE_HH 30 #define HB_FACE_HH 31 32 #include "hb.hh" 33 34 #include "hb-shaper.hh" 35 #include "hb-shape-plan.hh" 36 #include "hb-ot-face.hh" 37 38 39 /* 40 * hb_face_t 41 */ 42 43 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, face); 44 #include "hb-shaper-list.hh" 45 #undef HB_SHAPER_IMPLEMENT 46 47 struct hb_face_t 48 { 49 hb_object_header_t header; 50 51 unsigned int index; /* Face index in a collection, zero-based. */ 52 mutable hb_atomic_t<unsigned> upem; /* Units-per-EM. */ 53 mutable hb_atomic_t<unsigned> num_glyphs;/* Number of glyphs. */ 54 55 hb_reference_table_func_t reference_table_func; 56 void *user_data; 57 hb_destroy_func_t destroy; 58 59 hb_get_table_tags_func_t get_table_tags_func; 60 void *get_table_tags_user_data; 61 hb_destroy_func_t get_table_tags_destroy; 62 63 hb_shaper_object_dataset_t<hb_face_t> data;/* Various shaper data. */ 64 hb_ot_face_t table; /* All the face's tables. */ 65 66 /* Cache */ 67 struct plan_node_t 68 { 69 hb_shape_plan_t *shape_plan; 70 plan_node_t *next; 71 }; 72 #ifndef HB_NO_SHAPER 73 hb_atomic_t<plan_node_t *> shape_plans; 74 #endif 75 76 hb_blob_t *reference_table (hb_tag_t tag) const 77 { 78 hb_blob_t *blob; 79 80 if (unlikely (!reference_table_func)) 81 return hb_blob_get_empty (); 82 83 blob = reference_table_func (/*Oh, well.*/const_cast<hb_face_t *> (this), tag, user_data); 84 if (unlikely (!blob)) 85 return hb_blob_get_empty (); 86 87 return blob; 88 } 89 90 unsigned int get_upem () const 91 { 92 unsigned int ret = upem; 93 if (unlikely (!ret)) 94 { 95 return load_upem (); 96 } 97 return ret; 98 } 99 100 unsigned int get_num_glyphs () const 101 { 102 unsigned int ret = num_glyphs; 103 if (unlikely (ret == UINT_MAX)) 104 return load_num_glyphs (); 105 return ret; 106 } 107 108 private: 109 HB_INTERNAL unsigned int load_upem () const; 110 HB_INTERNAL unsigned int load_num_glyphs () const; 111 }; 112 DECLARE_NULL_INSTANCE (hb_face_t); 113 114 115 #endif /* HB_FACE_HH */