hb-ot-shape-complex-default.cc revision 71b4c999a511bf018acaf48a45e070470c0daf12
1/* 2 * Copyright © 2010,2012 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#include "hb-ot-shape-complex-private.hh" 28 29 30/* TODO Add kana, and other small shapers here */ 31 32 33/* The default shaper *only* adds additional per-script features.*/ 34 35static const hb_tag_t hangul_features[] = 36{ 37 HB_TAG('l','j','m','o'), 38 HB_TAG('v','j','m','o'), 39 HB_TAG('t','j','m','o'), 40 HB_TAG_NONE 41}; 42 43static const hb_tag_t tibetan_features[] = 44{ 45 HB_TAG('a','b','v','s'), 46 HB_TAG('b','l','w','s'), 47 HB_TAG('a','b','v','m'), 48 HB_TAG('b','l','w','m'), 49 HB_TAG_NONE 50}; 51 52static void 53collect_features_default (hb_ot_shape_planner_t *plan) 54{ 55 const hb_tag_t *script_features = NULL; 56 57 switch ((hb_tag_t) plan->props.script) 58 { 59 /* Unicode-1.1 additions */ 60 case HB_SCRIPT_HANGUL: 61 script_features = hangul_features; 62 break; 63 64 /* Unicode-2.0 additions */ 65 case HB_SCRIPT_TIBETAN: 66 script_features = tibetan_features; 67 break; 68 } 69 70 for (; script_features && *script_features; script_features++) 71 plan->map.add_global_bool_feature (*script_features); 72} 73 74static hb_ot_shape_normalization_mode_t 75normalization_preference_default (const hb_segment_properties_t *props) 76{ 77 return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS; 78} 79 80static bool 81compose_default (const hb_ot_shape_normalize_context_t *c, 82 hb_codepoint_t a, 83 hb_codepoint_t b, 84 hb_codepoint_t *ab) 85{ 86 /* Hebrew presentation-form shaping. 87 * https://bugzilla.mozilla.org/show_bug.cgi?id=728866 88 * Hebrew presentation forms with dagesh, for characters 0x05D0..0x05EA; 89 * Note that some letters do not have a dagesh presForm encoded. 90 */ 91 static const hb_codepoint_t sDageshForms[0x05EA - 0x05D0 + 1] = { 92 0xFB30, /* ALEF */ 93 0xFB31, /* BET */ 94 0xFB32, /* GIMEL */ 95 0xFB33, /* DALET */ 96 0xFB34, /* HE */ 97 0xFB35, /* VAV */ 98 0xFB36, /* ZAYIN */ 99 0x0000, /* HET */ 100 0xFB38, /* TET */ 101 0xFB39, /* YOD */ 102 0xFB3A, /* FINAL KAF */ 103 0xFB3B, /* KAF */ 104 0xFB3C, /* LAMED */ 105 0x0000, /* FINAL MEM */ 106 0xFB3E, /* MEM */ 107 0x0000, /* FINAL NUN */ 108 0xFB40, /* NUN */ 109 0xFB41, /* SAMEKH */ 110 0x0000, /* AYIN */ 111 0xFB43, /* FINAL PE */ 112 0xFB44, /* PE */ 113 0x0000, /* FINAL TSADI */ 114 0xFB46, /* TSADI */ 115 0xFB47, /* QOF */ 116 0xFB48, /* RESH */ 117 0xFB49, /* SHIN */ 118 0xFB4A /* TAV */ 119 }; 120 121 bool found = c->unicode->compose (a, b, ab); 122 123 if (!found && (b & ~0x7F) == 0x0580) { 124 /* Special-case Hebrew presentation forms that are excluded from 125 * standard normalization, but wanted for old fonts. */ 126 switch (b) { 127 case 0x05B4: /* HIRIQ */ 128 if (a == 0x05D9) { /* YOD */ 129 *ab = 0xFB1D; 130 found = true; 131 } 132 break; 133 case 0x05B7: /* patah */ 134 if (a == 0x05F2) { /* YIDDISH YOD YOD */ 135 *ab = 0xFB1F; 136 found = true; 137 } else if (a == 0x05D0) { /* ALEF */ 138 *ab = 0xFB2E; 139 found = true; 140 } 141 break; 142 case 0x05B8: /* QAMATS */ 143 if (a == 0x05D0) { /* ALEF */ 144 *ab = 0xFB2F; 145 found = true; 146 } 147 break; 148 case 0x05B9: /* HOLAM */ 149 if (a == 0x05D5) { /* VAV */ 150 *ab = 0xFB4B; 151 found = true; 152 } 153 break; 154 case 0x05BC: /* DAGESH */ 155 if (a >= 0x05D0 && a <= 0x05EA) { 156 *ab = sDageshForms[a - 0x05D0]; 157 found = (*ab != 0); 158 } else if (a == 0xFB2A) { /* SHIN WITH SHIN DOT */ 159 *ab = 0xFB2C; 160 found = true; 161 } else if (a == 0xFB2B) { /* SHIN WITH SIN DOT */ 162 *ab = 0xFB2D; 163 found = true; 164 } 165 break; 166 case 0x05BF: /* RAFE */ 167 switch (a) { 168 case 0x05D1: /* BET */ 169 *ab = 0xFB4C; 170 found = true; 171 break; 172 case 0x05DB: /* KAF */ 173 *ab = 0xFB4D; 174 found = true; 175 break; 176 case 0x05E4: /* PE */ 177 *ab = 0xFB4E; 178 found = true; 179 break; 180 } 181 break; 182 case 0x05C1: /* SHIN DOT */ 183 if (a == 0x05E9) { /* SHIN */ 184 *ab = 0xFB2A; 185 found = true; 186 } else if (a == 0xFB49) { /* SHIN WITH DAGESH */ 187 *ab = 0xFB2C; 188 found = true; 189 } 190 break; 191 case 0x05C2: /* SIN DOT */ 192 if (a == 0x05E9) { /* SHIN */ 193 *ab = 0xFB2B; 194 found = true; 195 } else if (a == 0xFB49) { /* SHIN WITH DAGESH */ 196 *ab = 0xFB2D; 197 found = true; 198 } 199 break; 200 } 201 } 202 203 return found; 204} 205 206const hb_ot_complex_shaper_t _hb_ot_complex_shaper_default = 207{ 208 "default", 209 collect_features_default, 210 NULL, /* override_features */ 211 NULL, /* data_create */ 212 NULL, /* data_destroy */ 213 NULL, /* preprocess_text */ 214 normalization_preference_default, 215 NULL, /* decompose */ 216 compose_default, 217 NULL, /* setup_masks */ 218 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE, 219 true, /* fallback_position */ 220}; 221