1 /* 2 * Copyright 2009 Red Hat, Inc. 3 * Copyright 2012 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 #include "hb.hh" 30 31 #include "hb-shaper.hh" 32 #include "hb-shape-plan.hh" 33 #include "hb-buffer.hh" 34 #include "hb-font.hh" 35 #include "hb-machinery.hh" 36 37 38 /** 39 * SECTION:hb-shape 40 * @title: hb-shape 41 * @short_description: Conversion of text strings into positioned glyphs 42 * @include: hb.h 43 * 44 * Shaping is the central operation of HarfBuzz. Shaping operates on buffers, 45 * which are sequences of Unicode characters that use the same font and have 46 * the same text direction, script, and language. After shaping the buffer 47 * contains the output glyphs and their positions. 48 **/ 49 50 51 #if HB_USE_ATEXIT 52 static void free_static_shaper_list (); 53 #endif 54 55 static const char *nil_shaper_list[] = {nullptr}; 56 57 static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *, 58 hb_shaper_list_lazy_loader_t> 59 { 60 static const char ** create () 61 { 62 const char **shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *)); 63 if (unlikely (!shaper_list)) 64 return nullptr; 65 66 const hb_shaper_entry_t *shapers = _hb_shapers_get (); 67 unsigned int i; 68 for (i = 0; i < HB_SHAPERS_COUNT; i++) 69 shaper_list[i] = shapers[i].name; 70 shaper_list[i] = nullptr; 71 72 #if HB_USE_ATEXIT 73 atexit (free_static_shaper_list); 74 #endif 75 76 return shaper_list; 77 } 78 static void destroy (const char **l) 79 { free (l); } 80 static const char ** get_null () 81 { return nil_shaper_list; } 82 } static_shaper_list; 83 84 #if HB_USE_ATEXIT 85 static 86 void free_static_shaper_list () 87 { 88 static_shaper_list.free_instance (); 89 } 90 #endif 91 92 93 /** 94 * hb_shape_list_shapers: 95 * 96 * Retrieves the list of shapers supported by HarfBuzz. 97 * 98 * Return value: (transfer none) (array zero-terminated=1): an array of 99 * constant strings 100 * 101 * Since: 0.9.2 102 **/ 103 const char ** 104 hb_shape_list_shapers () 105 { 106 return static_shaper_list.get_unconst (); 107 } 108 109 110 /** 111 * hb_shape_full: 112 * @font: an #hb_font_t to use for shaping 113 * @buffer: an #hb_buffer_t to shape 114 * @features: (array length=num_features) (allow-none): an array of user 115 * specified #hb_feature_t or %NULL 116 * @num_features: the length of @features array 117 * @shaper_list: (array zero-terminated=1) (allow-none): a %NULL-terminated 118 * array of shapers to use or %NULL 119 * 120 * See hb_shape() for details. If @shaper_list is not %NULL, the specified 121 * shapers will be used in the given order, otherwise the default shapers list 122 * will be used. 123 * 124 * Return value: false if all shapers failed, true otherwise 125 * 126 * Since: 0.9.2 127 **/ 128 hb_bool_t 129 hb_shape_full (hb_font_t *font, 130 hb_buffer_t *buffer, 131 const hb_feature_t *features, 132 unsigned int num_features, 133 const char * const *shaper_list) 134 { 135 hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached2 (font->face, &buffer->props, 136 features, num_features, 137 font->coords, font->num_coords, 138 shaper_list); 139 hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features); 140 hb_shape_plan_destroy (shape_plan); 141 142 if (res) 143 buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS; 144 return res; 145 } 146 147 /** 148 * hb_shape: 149 * @font: an #hb_font_t to use for shaping 150 * @buffer: an #hb_buffer_t to shape 151 * @features: (array length=num_features) (allow-none): an array of user 152 * specified #hb_feature_t or %NULL 153 * @num_features: the length of @features array 154 * 155 * Shapes @buffer using @font turning its Unicode characters content to 156 * positioned glyphs. If @features is not %NULL, it will be used to control the 157 * features applied during shaping. 158 * 159 * Since: 0.9.2 160 **/ 161 void 162 hb_shape (hb_font_t *font, 163 hb_buffer_t *buffer, 164 const hb_feature_t *features, 165 unsigned int num_features) 166 { 167 hb_shape_full (font, buffer, features, num_features, nullptr); 168 } 169
