1 /* 2 * Copyright © 2009 Red Hat, Inc. 3 * Copyright © 2011 Codethink Limited 4 * Copyright © 2010,2011,2012 Google, Inc. 5 * 6 * This is part of HarfBuzz, a text shaping library. 7 * 8 * Permission is hereby granted, without written agreement and without 9 * license or royalty fees, to use, copy, modify, and distribute this 10 * software and its documentation for any purpose, provided that the 11 * above copyright notice and the following two paragraphs appear in 12 * all copies of this software. 13 * 14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 18 * DAMAGE. 19 * 20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 25 * 26 * Red Hat Author(s): Behdad Esfahbod 27 * Codethink Author(s): Ryan Lortie 28 * Google Author(s): Behdad Esfahbod 29 */ 30 31 #ifndef HB_UNICODE_HH 32 #define HB_UNICODE_HH 33 34 #include "hb.hh" 35 36 37 extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256]; 38 39 /* 40 * hb_unicode_funcs_t 41 */ 42 43 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \ 44 HB_UNICODE_FUNC_IMPLEMENT (combining_class) \ 45 HB_IF_NOT_DEPRECATED (HB_UNICODE_FUNC_IMPLEMENT (eastasian_width)) \ 46 HB_UNICODE_FUNC_IMPLEMENT (general_category) \ 47 HB_UNICODE_FUNC_IMPLEMENT (mirroring) \ 48 HB_UNICODE_FUNC_IMPLEMENT (script) \ 49 HB_UNICODE_FUNC_IMPLEMENT (compose) \ 50 HB_UNICODE_FUNC_IMPLEMENT (decompose) \ 51 HB_IF_NOT_DEPRECATED (HB_UNICODE_FUNC_IMPLEMENT (decompose_compatibility)) \ 52 /* ^--- Add new callbacks here */ 53 54 /* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */ 55 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \ 56 HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_combining_class_t, combining_class) \ 57 HB_IF_NOT_DEPRECATED (HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width)) \ 58 HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \ 59 HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \ 60 HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \ 61 /* ^--- Add new simple callbacks here */ 62 63 struct hb_unicode_funcs_t 64 { 65 hb_object_header_t header; 66 67 hb_unicode_funcs_t *parent; 68 69 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \ 70 return_type name (hb_codepoint_t unicode) { return func.name (this, unicode, user_data.name); } 71 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE 72 #undef HB_UNICODE_FUNC_IMPLEMENT 73 composehb_unicode_funcs_t74 hb_bool_t compose (hb_codepoint_t a, hb_codepoint_t b, 75 hb_codepoint_t *ab) 76 { 77 *ab = 0; 78 if (unlikely (!a || !b)) return false; 79 return func.compose (this, a, b, ab, user_data.compose); 80 } 81 decomposehb_unicode_funcs_t82 hb_bool_t decompose (hb_codepoint_t ab, 83 hb_codepoint_t *a, hb_codepoint_t *b) 84 { 85 *a = ab; *b = 0; 86 return func.decompose (this, ab, a, b, user_data.decompose); 87 } 88 decompose_compatibilityhb_unicode_funcs_t89 unsigned int decompose_compatibility (hb_codepoint_t u, 90 hb_codepoint_t *decomposed) 91 { 92 #ifdef HB_DISABLE_DEPRECATED 93 unsigned int ret = 0; 94 #else 95 unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility); 96 #endif 97 if (ret == 1 && u == decomposed[0]) { 98 decomposed[0] = 0; 99 return 0; 100 } 101 decomposed[ret] = 0; 102 return ret; 103 } 104 105 unsigned int modified_combining_classhb_unicode_funcs_t106 modified_combining_class (hb_codepoint_t u) 107 { 108 /* XXX This hack belongs to the USE shaper (for Tai Tham): 109 * Reorder SAKOT to ensure it comes after any tone marks. */ 110 if (unlikely (u == 0x1A60u)) return 254; 111 112 /* XXX This hack belongs to the Tibetan shaper: 113 * Reorder PADMA to ensure it comes after any vowel marks. */ 114 if (unlikely (u == 0x0FC6u)) return 254; 115 /* Reorder TSA -PHRU to reorder before U+0F74 */ 116 if (unlikely (u == 0x0F39u)) return 127; 117 118 return _hb_modified_combining_class[combining_class (u)]; 119 } 120 121 static hb_bool_t is_variation_selectorhb_unicode_funcs_t122 is_variation_selector (hb_codepoint_t unicode) 123 { 124 /* U+180B..180D MONGOLIAN FREE VARIATION SELECTORs are handled in the 125 * Arabic shaper. No need to match them here. */ 126 return unlikely (hb_in_ranges<hb_codepoint_t> (unicode, 127 0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */ 128 0xE0100u, 0xE01EFu)); /* VARIATION SELECTOR-17..256 */ 129 } 130 131 /* Default_Ignorable codepoints: 132 * 133 * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable, 134 * we do NOT want to hide them, as the way Uniscribe has implemented them 135 * is with regular spacing glyphs, and that's the way fonts are made to work. 136 * As such, we make exceptions for those four. 137 * Also ignoring U+1BCA0..1BCA3. https://github.com/harfbuzz/harfbuzz/issues/503 138 * 139 * Unicode 7.0: 140 * $ grep '; Default_Ignorable_Code_Point ' DerivedCoreProperties.txt | sed 's/;.*#/#/' 141 * 00AD # Cf SOFT HYPHEN 142 * 034F # Mn COMBINING GRAPHEME JOINER 143 * 061C # Cf ARABIC LETTER MARK 144 * 115F..1160 # Lo [2] HANGUL CHOSEONG FILLER..HANGUL JUNGSEONG FILLER 145 * 17B4..17B5 # Mn [2] KHMER VOWEL INHERENT AQ..KHMER VOWEL INHERENT AA 146 * 180B..180D # Mn [3] MONGOLIAN FREE VARIATION SELECTOR ONE..MONGOLIAN FREE VARIATION SELECTOR THREE 147 * 180E # Cf MONGOLIAN VOWEL SEPARATOR 148 * 200B..200F # Cf [5] ZERO WIDTH SPACE..RIGHT-TO-LEFT MARK 149 * 202A..202E # Cf [5] LEFT-TO-RIGHT EMBEDDING..RIGHT-TO-LEFT OVERRIDE 150 * 2060..2064 # Cf [5] WORD JOINER..INVISIBLE PLUS 151 * 2065 # Cn <reserved-2065> 152 * 2066..206F # Cf [10] LEFT-TO-RIGHT ISOLATE..NOMINAL DIGIT SHAPES 153 * 3164 # Lo HANGUL FILLER 154 * FE00..FE0F # Mn [16] VARIATION SELECTOR-1..VARIATION SELECTOR-16 155 * FEFF # Cf ZERO WIDTH NO-BREAK SPACE 156 * FFA0 # Lo HALFWIDTH HANGUL FILLER 157 * FFF0..FFF8 # Cn [9] <reserved-FFF0>..<reserved-FFF8> 158 * 1BCA0..1BCA3 # Cf [4] SHORTHAND FORMAT LETTER OVERLAP..SHORTHAND FORMAT UP STEP 159 * 1D173..1D17A # Cf [8] MUSICAL SYMBOL BEGIN BEAM..MUSICAL SYMBOL END PHRASE 160 * E0000 # Cn <reserved-E0000> 161 * E0001 # Cf LANGUAGE TAG 162 * E0002..E001F # Cn [30] <reserved-E0002>..<reserved-E001F> 163 * E0020..E007F # Cf [96] TAG SPACE..CANCEL TAG 164 * E0080..E00FF # Cn [128] <reserved-E0080>..<reserved-E00FF> 165 * E0100..E01EF # Mn [240] VARIATION SELECTOR-17..VARIATION SELECTOR-256 166 * E01F0..E0FFF # Cn [3600] <reserved-E01F0>..<reserved-E0FFF> 167 */ 168 static hb_bool_t is_default_ignorablehb_unicode_funcs_t169 is_default_ignorable (hb_codepoint_t ch) 170 { 171 hb_codepoint_t plane = ch >> 16; 172 if (likely (plane == 0)) 173 { 174 /* BMP */ 175 hb_codepoint_t page = ch >> 8; 176 switch (page) { 177 case 0x00: return unlikely (ch == 0x00ADu); 178 case 0x03: return unlikely (ch == 0x034Fu); 179 case 0x06: return unlikely (ch == 0x061Cu); 180 case 0x17: return hb_in_range<hb_codepoint_t> (ch, 0x17B4u, 0x17B5u); 181 case 0x18: return hb_in_range<hb_codepoint_t> (ch, 0x180Bu, 0x180Eu); 182 case 0x20: return hb_in_ranges<hb_codepoint_t> (ch, 0x200Bu, 0x200Fu, 183 0x202Au, 0x202Eu, 184 0x2060u, 0x206Fu); 185 case 0xFE: return hb_in_range<hb_codepoint_t> (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu; 186 case 0xFF: return hb_in_range<hb_codepoint_t> (ch, 0xFFF0u, 0xFFF8u); 187 default: return false; 188 } 189 } 190 else 191 { 192 /* Other planes */ 193 switch (plane) { 194 case 0x01: return hb_in_range<hb_codepoint_t> (ch, 0x1D173u, 0x1D17Au); 195 case 0x0E: return hb_in_range<hb_codepoint_t> (ch, 0xE0000u, 0xE0FFFu); 196 default: return false; 197 } 198 } 199 } 200 201 /* Space estimates based on: 202 * https://unicode.org/charts/PDF/U2000.pdf 203 * https://docs.microsoft.com/en-us/typography/develop/character-design-standards/whitespace 204 */ 205 enum space_t { 206 NOT_SPACE = 0, 207 SPACE_EM = 1, 208 SPACE_EM_2 = 2, 209 SPACE_EM_3 = 3, 210 SPACE_EM_4 = 4, 211 SPACE_EM_5 = 5, 212 SPACE_EM_6 = 6, 213 SPACE_EM_16 = 16, 214 SPACE_4_EM_18, /* 4/18th of an EM! */ 215 SPACE, 216 SPACE_FIGURE, 217 SPACE_PUNCTUATION, 218 SPACE_NARROW, 219 }; 220 static space_t space_fallback_typehb_unicode_funcs_t221 space_fallback_type (hb_codepoint_t u) 222 { 223 switch (u) 224 { 225 /* All GC=Zs chars that can use a fallback. */ 226 default: return NOT_SPACE; /* U+1680 OGHAM SPACE MARK */ 227 case 0x0020u: return SPACE; /* U+0020 SPACE */ 228 case 0x00A0u: return SPACE; /* U+00A0 NO-BREAK SPACE */ 229 case 0x2000u: return SPACE_EM_2; /* U+2000 EN QUAD */ 230 case 0x2001u: return SPACE_EM; /* U+2001 EM QUAD */ 231 case 0x2002u: return SPACE_EM_2; /* U+2002 EN SPACE */ 232 case 0x2003u: return SPACE_EM; /* U+2003 EM SPACE */ 233 case 0x2004u: return SPACE_EM_3; /* U+2004 THREE-PER-EM SPACE */ 234 case 0x2005u: return SPACE_EM_4; /* U+2005 FOUR-PER-EM SPACE */ 235 case 0x2006u: return SPACE_EM_6; /* U+2006 SIX-PER-EM SPACE */ 236 case 0x2007u: return SPACE_FIGURE; /* U+2007 FIGURE SPACE */ 237 case 0x2008u: return SPACE_PUNCTUATION; /* U+2008 PUNCTUATION SPACE */ 238 case 0x2009u: return SPACE_EM_5; /* U+2009 THIN SPACE */ 239 case 0x200Au: return SPACE_EM_16; /* U+200A HAIR SPACE */ 240 case 0x202Fu: return SPACE_NARROW; /* U+202F NARROW NO-BREAK SPACE */ 241 case 0x205Fu: return SPACE_4_EM_18; /* U+205F MEDIUM MATHEMATICAL SPACE */ 242 case 0x3000u: return SPACE_EM; /* U+3000 IDEOGRAPHIC SPACE */ 243 } 244 } 245 246 struct { 247 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name; 248 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 249 #undef HB_UNICODE_FUNC_IMPLEMENT 250 } func; 251 252 struct { 253 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name; 254 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 255 #undef HB_UNICODE_FUNC_IMPLEMENT 256 } user_data; 257 258 struct { 259 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name; 260 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 261 #undef HB_UNICODE_FUNC_IMPLEMENT 262 } destroy; 263 }; 264 DECLARE_NULL_INSTANCE (hb_unicode_funcs_t); 265 266 267 /* 268 * Modified combining marks 269 */ 270 271 /* Hebrew 272 * 273 * We permute the "fixed-position" classes 10-26 into the order 274 * described in the SBL Hebrew manual: 275 * 276 * https://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf 277 * 278 * (as recommended by: 279 * https://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering/msg22823/) 280 * 281 * More details here: 282 * https://bugzilla.mozilla.org/show_bug.cgi?id=662055 283 */ 284 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */ 285 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */ 286 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */ 287 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */ 288 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */ 289 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */ 290 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */ 291 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */ 292 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */ 293 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */ 294 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */ 295 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */ 296 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */ 297 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */ 298 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */ 299 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */ 300 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */ 301 302 /* 303 * Arabic 304 * 305 * Modify to move Shadda (ccc=33) before other marks. See: 306 * https://unicode.org/faq/normalization.html#8 307 * https://unicode.org/faq/normalization.html#9 308 */ 309 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */ 310 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */ 311 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */ 312 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */ 313 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */ 314 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */ 315 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */ 316 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */ 317 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */ 318 319 /* Syriac */ 320 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */ 321 322 /* Telugu 323 * 324 * Modify Telugu length marks (ccc=84, ccc=91). 325 * These are the only matras in the main Indic scripts range that have 326 * a non-zero ccc. That makes them reorder with the Halant (ccc=9). 327 * Assign 5 and 6, which are otherwise unassigned. 328 */ 329 #define HB_MODIFIED_COMBINING_CLASS_CCC84 5 /* length mark */ 330 #define HB_MODIFIED_COMBINING_CLASS_CCC91 6 /* ai length mark */ 331 332 /* Thai 333 * 334 * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9). 335 * Assign 3, which is unassigned otherwise. 336 * Uniscribe does this reordering too. 337 */ 338 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */ 339 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */ 340 341 /* Lao */ 342 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */ 343 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */ 344 345 /* Tibetan 346 * 347 * In case of multiple vowel-signs, use u first (but after achung) 348 * this allows Dzongkha multi-vowel shortcuts to render correctly 349 */ 350 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */ 351 #define HB_MODIFIED_COMBINING_CLASS_CCC130 132 /* sign i */ 352 #define HB_MODIFIED_COMBINING_CLASS_CCC132 131 /* sign u */ 353 354 /* Misc */ 355 356 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \ 357 (FLAG_UNSAFE (gen_cat) & \ 358 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \ 359 FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \ 360 FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK))) 361 362 363 /* 364 * Ranges, used for bsearch tables. 365 */ 366 367 struct hb_unicode_range_t 368 { 369 static int cmphb_unicode_range_t370 cmp (const void *_key, const void *_item) 371 { 372 hb_codepoint_t cp = *((hb_codepoint_t *) _key); 373 const hb_unicode_range_t *range = (hb_unicode_range_t *) _item; 374 375 if (cp < range->start) 376 return -1; 377 else if (cp <= range->end) 378 return 0; 379 else 380 return +1; 381 } 382 383 hb_codepoint_t start; 384 hb_codepoint_t end; 385 }; 386 387 /* 388 * Emoji. 389 */ 390 391 HB_INTERNAL bool 392 _hb_unicode_is_emoji_Extended_Pictographic (hb_codepoint_t cp); 393 394 395 extern "C" HB_INTERNAL hb_unicode_funcs_t *hb_ucd_get_unicode_funcs (); 396 397 398 #endif /* HB_UNICODE_HH */ 399