hb-shaper.hh (4622B)
1 /* 2 * Copyright © 2012 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_SHAPER_HH 28 #define HB_SHAPER_HH 29 30 #include "hb.hh" 31 #include "hb-machinery.hh" 32 33 typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t *shape_plan, 34 hb_font_t *font, 35 hb_buffer_t *buffer, 36 const hb_feature_t *features, 37 unsigned int num_features); 38 39 #define HB_SHAPER_IMPLEMENT(name) \ 40 extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape; 41 #include "hb-shaper-list.hh" 42 #undef HB_SHAPER_IMPLEMENT 43 44 struct hb_shaper_entry_t { 45 char name[16]; 46 hb_shape_func_t *func; 47 }; 48 49 HB_INTERNAL const hb_shaper_entry_t * 50 _hb_shapers_get (); 51 52 53 template <typename Data, unsigned int WheresData, typename T> 54 struct hb_shaper_lazy_loader_t; 55 56 #define HB_SHAPER_ORDER(Shaper) \ 57 HB_PASTE (HB_SHAPER_ORDER_, Shaper) 58 enum hb_shaper_order_t 59 { 60 _HB_SHAPER_ORDER_ORDER_ZERO, 61 #define HB_SHAPER_IMPLEMENT(Shaper) \ 62 HB_SHAPER_ORDER (Shaper), 63 #include "hb-shaper-list.hh" 64 #undef HB_SHAPER_IMPLEMENT 65 _HB_SHAPERS_COUNT_PLUS_ONE, 66 HB_SHAPERS_COUNT = _HB_SHAPERS_COUNT_PLUS_ONE - 1, 67 }; 68 69 template <enum hb_shaper_order_t order, typename Object> struct hb_shaper_object_data_type_t; 70 71 #define HB_SHAPER_DATA_SUCCEEDED ((void *) +1) 72 #define HB_SHAPER_DATA_TYPE(shaper, object) hb_##shaper##_##object##_data_t 73 #define HB_SHAPER_DATA_CREATE_FUNC(shaper, object) _hb_##shaper##_shaper_##object##_data_create 74 #define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object) _hb_##shaper##_shaper_##object##_data_destroy 75 76 #define HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, object) \ 77 \ 78 struct HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \ 79 extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \ 80 HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object); \ 81 extern "C" HB_INTERNAL void \ 82 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *shaper##_##object); \ 83 \ 84 template <> \ 85 struct hb_shaper_object_data_type_t<HB_SHAPER_ORDER (shaper), hb_##object##_t> \ 86 { \ 87 typedef HB_SHAPER_DATA_TYPE(shaper, object) value; \ 88 }; \ 89 \ 90 template <unsigned int WheresData> \ 91 struct hb_shaper_lazy_loader_t<hb_##object##_t, WheresData, HB_SHAPER_DATA_TYPE(shaper, object)> \ 92 : hb_lazy_loader_t<HB_SHAPER_DATA_TYPE(shaper, object), \ 93 hb_shaper_lazy_loader_t<hb_##object##_t, \ 94 WheresData, \ 95 HB_SHAPER_DATA_TYPE(shaper, object)>, \ 96 hb_##object##_t, WheresData> \ 97 { \ 98 typedef HB_SHAPER_DATA_TYPE(shaper, object) Type; \ 99 static Type* create (hb_##object##_t *data) \ 100 { return HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (data); } \ 101 static Type *get_null () { return nullptr; } \ 102 static void destroy (Type *p) { HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (p); } \ 103 }; \ 104 \ 105 static_assert (true, "") /* Require semicolon after. */ 106 107 108 template <typename Object> 109 struct hb_shaper_object_dataset_t 110 { 111 void init0 (Object *parent_data) 112 { 113 this->parent_data = parent_data; 114 #define HB_SHAPER_IMPLEMENT(shaper) shaper.init0 (); 115 #include "hb-shaper-list.hh" 116 #undef HB_SHAPER_IMPLEMENT 117 } 118 void fini () 119 { 120 #define HB_SHAPER_IMPLEMENT(shaper) shaper.fini (); 121 #include "hb-shaper-list.hh" 122 #undef HB_SHAPER_IMPLEMENT 123 } 124 125 Object *parent_data; /* MUST be JUST before the lazy loaders. */ 126 #define HB_SHAPER_IMPLEMENT(shaper) \ 127 hb_shaper_lazy_loader_t<Object, HB_SHAPER_ORDER(shaper), \ 128 typename hb_shaper_object_data_type_t<HB_SHAPER_ORDER(shaper), Object>::value \ 129 > shaper; 130 #include "hb-shaper-list.hh" 131 #undef HB_SHAPER_IMPLEMENT 132 }; 133 134 #endif /* HB_SHAPER_HH */