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 35 static 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 43 static 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 52 static void 53 collect_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 74 static hb_ot_shape_normalization_mode_t 75 normalization_preference_default (const hb_segment_properties_t *props) 76 { 77 switch ((hb_tag_t) props->script) 78 { 79 /* Unicode-1.1 additions */ 80 case HB_SCRIPT_HANGUL: 81 return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL; 82 } 83 return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS; 84 } 85 86 static bool 87 compose_default (const hb_ot_shape_normalize_context_t *c, 88 hb_codepoint_t a, 89 hb_codepoint_t b, 90 hb_codepoint_t *ab) 91 { 92 /* Hebrew presentation-form shaping. 93 * https://bugzilla.mozilla.org/show_bug.cgi?id=728866 94 * Hebrew presentation forms with dagesh, for characters 0x05D0..0x05EA; 95 * Note that some letters do not have a dagesh presForm encoded. 96 */ 97 static const hb_codepoint_t sDageshForms[0x05EA - 0x05D0 + 1] = { 98 0xFB30, /* ALEF */ 99 0xFB31, /* BET */ 100 0xFB32, /* GIMEL */ 101 0xFB33, /* DALET */ 102 0xFB34, /* HE */ 103 0xFB35, /* VAV */ 104 0xFB36, /* ZAYIN */ 105 0x0000, /* HET */ 106 0xFB38, /* TET */ 107 0xFB39, /* YOD */ 108 0xFB3A, /* FINAL KAF */ 109 0xFB3B, /* KAF */ 110 0xFB3C, /* LAMED */ 111 0x0000, /* FINAL MEM */ 112 0xFB3E, /* MEM */ 113 0x0000, /* FINAL NUN */ 114 0xFB40, /* NUN */ 115 0xFB41, /* SAMEKH */ 116 0x0000, /* AYIN */ 117 0xFB43, /* FINAL PE */ 118 0xFB44, /* PE */ 119 0x0000, /* FINAL TSADI */ 120 0xFB46, /* TSADI */ 121 0xFB47, /* QOF */ 122 0xFB48, /* RESH */ 123 0xFB49, /* SHIN */ 124 0xFB4A /* TAV */ 125 }; 126 127 bool found = c->unicode->compose (a, b, ab); 128 129 if (!found && (b & ~0x7F) == 0x0580) { 130 /* Special-case Hebrew presentation forms that are excluded from 131 * standard normalization, but wanted for old fonts. */ 132 switch (b) { 133 case 0x05B4: /* HIRIQ */ 134 if (a == 0x05D9) { /* YOD */ 135 *ab = 0xFB1D; 136 found = true; 137 } 138 break; 139 case 0x05B7: /* patah */ 140 if (a == 0x05F2) { /* YIDDISH YOD YOD */ 141 *ab = 0xFB1F; 142 found = true; 143 } else if (a == 0x05D0) { /* ALEF */ 144 *ab = 0xFB2E; 145 found = true; 146 } 147 break; 148 case 0x05B8: /* QAMATS */ 149 if (a == 0x05D0) { /* ALEF */ 150 *ab = 0xFB2F; 151 found = true; 152 } 153 break; 154 case 0x05B9: /* HOLAM */ 155 if (a == 0x05D5) { /* VAV */ 156 *ab = 0xFB4B; 157 found = true; 158 } 159 break; 160 case 0x05BC: /* DAGESH */ 161 if (a >= 0x05D0 && a <= 0x05EA) { 162 *ab = sDageshForms[a - 0x05D0]; 163 found = (*ab != 0); 164 } else if (a == 0xFB2A) { /* SHIN WITH SHIN DOT */ 165 *ab = 0xFB2C; 166 found = true; 167 } else if (a == 0xFB2B) { /* SHIN WITH SIN DOT */ 168 *ab = 0xFB2D; 169 found = true; 170 } 171 break; 172 case 0x05BF: /* RAFE */ 173 switch (a) { 174 case 0x05D1: /* BET */ 175 *ab = 0xFB4C; 176 found = true; 177 break; 178 case 0x05DB: /* KAF */ 179 *ab = 0xFB4D; 180 found = true; 181 break; 182 case 0x05E4: /* PE */ 183 *ab = 0xFB4E; 184 found = true; 185 break; 186 } 187 break; 188 case 0x05C1: /* SHIN DOT */ 189 if (a == 0x05E9) { /* SHIN */ 190 *ab = 0xFB2A; 191 found = true; 192 } else if (a == 0xFB49) { /* SHIN WITH DAGESH */ 193 *ab = 0xFB2C; 194 found = true; 195 } 196 break; 197 case 0x05C2: /* SIN DOT */ 198 if (a == 0x05E9) { /* SHIN */ 199 *ab = 0xFB2B; 200 found = true; 201 } else if (a == 0xFB49) { /* SHIN WITH DAGESH */ 202 *ab = 0xFB2D; 203 found = true; 204 } 205 break; 206 } 207 } 208 209 return found; 210 } 211 212 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_default = 213 { 214 "default", 215 collect_features_default, 216 NULL, /* override_features */ 217 NULL, /* data_create */ 218 NULL, /* data_destroy */ 219 NULL, /* preprocess_text */ 220 normalization_preference_default, 221 NULL, /* decompose */ 222 compose_default, 223 NULL, /* setup_masks */ 224 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE, 225 true, /* fallback_position */ 226 }; 227
