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_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_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_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 74 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 82 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 89 unsigned int decompose_compatibility (hb_codepoint_t u, 90 hb_codepoint_t *decomposed) 91 { 92 unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility); 93 if (ret == 1 && u == decomposed[0]) { 94 decomposed[0] = 0; 95 return 0; 96 } 97 decomposed[ret] = 0; 98 return ret; 99 } 100 101 unsigned int 102 modified_combining_class (hb_codepoint_t u) 103 { 104 /* XXX This hack belongs to the Myanmar shaper. */ 105 if (unlikely (u == 0x1037u)) u = 0x103Au; 106 107 /* XXX This hack belongs to the USE shaper (for Tai Tham): 108 * Reorder SAKOT to ensure it comes after any tone marks. */ 109 if (unlikely (u == 0x1A60u)) return 254; 110 111 /* XXX This hack belongs to the Tibetan shaper: 112 * Reorder PADMA to ensure it comes after any vowel marks. */ 113 if (unlikely (u == 0x0FC6u)) return 254; 114 /* Reorder TSA -PHRU to reorder before U+0F74 */ 115 if (unlikely (u == 0x0F39u)) return 127; 116 117 return _hb_modified_combining_class[combining_class (u)]; 118 } 119 120 static hb_bool_t 121 is_variation_selector (hb_codepoint_t unicode) 122 { 123 /* U+180B..180D MONGOLIAN FREE VARIATION SELECTORs are handled in the 124 * Arabic shaper. No need to match them here. */ 125 return unlikely (hb_in_ranges<hb_codepoint_t> (unicode, 126 0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */ 127 0xE0100u, 0xE01EFu)); /* VARIATION SELECTOR-17..256 */ 128 } 129 130 /* Default_Ignorable codepoints: 131 * 132 * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable, 133 * we do NOT want to hide them, as the way Uniscribe has implemented them 134 * is with regular spacing glyphs, and that's the way fonts are made to work. 135 * As such, we make exceptions for those four. 136 * Also ignoring U+1BCA0..1BCA3. https://github.com/harfbuzz/harfbuzz/issues/503 137 * 138 * Unicode 7.0: 139 * $ grep '; Default_Ignorable_Code_Point ' DerivedCoreProperties.txt | sed 's/;.*#/#/' 140 * 00AD # Cf SOFT HYPHEN 141 * 034F # Mn COMBINING GRAPHEME JOINER 142 * 061C # Cf ARABIC LETTER MARK 143 * 115F..1160 # Lo [2] HANGUL CHOSEONG FILLER..HANGUL JUNGSEONG FILLER 144 * 17B4..17B5 # Mn [2] KHMER VOWEL INHERENT AQ..KHMER VOWEL INHERENT AA 145 * 180B..180D # Mn [3] MONGOLIAN FREE VARIATION SELECTOR ONE..MONGOLIAN FREE VARIATION SELECTOR THREE 146 * 180E # Cf MONGOLIAN VOWEL SEPARATOR 147 * 200B..200F # Cf [5] ZERO WIDTH SPACE..RIGHT-TO-LEFT MARK 148 * 202A..202E # Cf [5] LEFT-TO-RIGHT EMBEDDING..RIGHT-TO-LEFT OVERRIDE 149 * 2060..2064 # Cf [5] WORD JOINER..INVISIBLE PLUS 150 * 2065 # Cn <reserved-2065> 151 * 2066..206F # Cf [10] LEFT-TO-RIGHT ISOLATE..NOMINAL DIGIT SHAPES 152 * 3164 # Lo HANGUL FILLER 153 * FE00..FE0F # Mn [16] VARIATION SELECTOR-1..VARIATION SELECTOR-16 154 * FEFF # Cf ZERO WIDTH NO-BREAK SPACE 155 * FFA0 # Lo HALFWIDTH HANGUL FILLER 156 * FFF0..FFF8 # Cn [9] <reserved-FFF0>..<reserved-FFF8> 157 * 1BCA0..1BCA3 # Cf [4] SHORTHAND FORMAT LETTER OVERLAP..SHORTHAND FORMAT UP STEP 158 * 1D173..1D17A # Cf [8] MUSICAL SYMBOL BEGIN BEAM..MUSICAL SYMBOL END PHRASE 159 * E0000 # Cn <reserved-E0000> 160 * E0001 # Cf LANGUAGE TAG 161 * E0002..E001F # Cn [30] <reserved-E0002>..<reserved-E001F> 162 * E0020..E007F # Cf [96] TAG SPACE..CANCEL TAG 163 * E0080..E00FF # Cn [128] <reserved-E0080>..<reserved-E00FF> 164 * E0100..E01EF # Mn [240] VARIATION SELECTOR-17..VARIATION SELECTOR-256 165 * E01F0..E0FFF # Cn [3600] <reserved-E01F0>..<reserved-E0FFF> 166 */ 167 static hb_bool_t 168 is_default_ignorable (hb_codepoint_t ch) 169 { 170 hb_codepoint_t plane = ch >> 16; 171 if (likely (plane == 0)) 172 { 173 /* BMP */ 174 hb_codepoint_t page = ch >> 8; 175 switch (page) { 176 case 0x00: return unlikely (ch == 0x00ADu); 177 case 0x03: return unlikely (ch == 0x034Fu); 178 case 0x06: return unlikely (ch == 0x061Cu); 179 case 0x17: return hb_in_range<hb_codepoint_t> (ch, 0x17B4u, 0x17B5u); 180 case 0x18: return hb_in_range<hb_codepoint_t> (ch, 0x180Bu, 0x180Eu); 181 case 0x20: return hb_in_ranges<hb_codepoint_t> (ch, 0x200Bu, 0x200Fu, 182 0x202Au, 0x202Eu, 183 0x2060u, 0x206Fu); 184 case 0xFE: return hb_in_range<hb_codepoint_t> (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu; 185 case 0xFF: return hb_in_range<hb_codepoint_t> (ch, 0xFFF0u, 0xFFF8u); 186 default: return false; 187 } 188 } 189 else 190 { 191 /* Other planes */ 192 switch (plane) { 193 case 0x01: return hb_in_range<hb_codepoint_t> (ch, 0x1D173u, 0x1D17Au); 194 case 0x0E: return hb_in_range<hb_codepoint_t> (ch, 0xE0000u, 0xE0FFFu); 195 default: return false; 196 } 197 } 198 } 199 200 /* Space estimates based on: 201 * https://unicode.org/charts/PDF/U2000.pdf 202 * https://docs.microsoft.com/en-us/typography/develop/character-design-standards/whitespace 203 */ 204 enum space_t { 205 NOT_SPACE = 0, 206 SPACE_EM = 1, 207 SPACE_EM_2 = 2, 208 SPACE_EM_3 = 3, 209 SPACE_EM_4 = 4, 210 SPACE_EM_5 = 5, 211 SPACE_EM_6 = 6, 212 SPACE_EM_16 = 16, 213 SPACE_4_EM_18, /* 4/18th of an EM! */ 214 SPACE, 215 SPACE_FIGURE, 216 SPACE_PUNCTUATION, 217 SPACE_NARROW, 218 }; 219 static space_t 220 space_fallback_type (hb_codepoint_t u) 221 { 222 switch (u) 223 { 224 /* All GC=Zs chars that can use a fallback. */ 225 default: return NOT_SPACE; /* U+1680 OGHAM SPACE MARK */ 226 case 0x0020u: return SPACE; /* U+0020 SPACE */ 227 case 0x00A0u: return SPACE; /* U+00A0 NO-BREAK SPACE */ 228 case 0x2000u: return SPACE_EM_2; /* U+2000 EN QUAD */ 229 case 0x2001u: return SPACE_EM; /* U+2001 EM QUAD */ 230 case 0x2002u: return SPACE_EM_2; /* U+2002 EN SPACE */ 231 case 0x2003u: return SPACE_EM; /* U+2003 EM SPACE */ 232 case 0x2004u: return SPACE_EM_3; /* U+2004 THREE-PER-EM SPACE */ 233 case 0x2005u: return SPACE_EM_4; /* U+2005 FOUR-PER-EM SPACE */ 234 case 0x2006u: return SPACE_EM_6; /* U+2006 SIX-PER-EM SPACE */ 235 case 0x2007u: return SPACE_FIGURE; /* U+2007 FIGURE SPACE */ 236 case 0x2008u: return SPACE_PUNCTUATION; /* U+2008 PUNCTUATION SPACE */ 237 case 0x2009u: return SPACE_EM_5; /* U+2009 THIN SPACE */ 238 case 0x200Au: return SPACE_EM_16; /* U+200A HAIR SPACE */ 239 case 0x202Fu: return SPACE_NARROW; /* U+202F NARROW NO-BREAK SPACE */ 240 case 0x205Fu: return SPACE_4_EM_18; /* U+205F MEDIUM MATHEMATICAL SPACE */ 241 case 0x3000u: return SPACE_EM; /* U+3000 IDEOGRAPHIC SPACE */ 242 } 243 } 244 245 struct { 246 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name; 247 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 248 #undef HB_UNICODE_FUNC_IMPLEMENT 249 } func; 250 251 struct { 252 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name; 253 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 254 #undef HB_UNICODE_FUNC_IMPLEMENT 255 } user_data; 256 257 struct { 258 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name; 259 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 260 #undef HB_UNICODE_FUNC_IMPLEMENT 261 } destroy; 262 }; 263 DECLARE_NULL_INSTANCE (hb_unicode_funcs_t); 264 265 266 /* 267 * Modified combining marks 268 */ 269 270 /* Hebrew 271 * 272 * We permute the "fixed-position" classes 10-26 into the order 273 * described in the SBL Hebrew manual: 274 * 275 * https://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf 276 * 277 * (as recommended by: 278 * https://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering/msg22823/) 279 * 280 * More details here: 281 * https://bugzilla.mozilla.org/show_bug.cgi?id=662055 282 */ 283 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */ 284 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */ 285 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */ 286 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */ 287 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */ 288 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */ 289 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */ 290 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */ 291 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */ 292 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */ 293 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */ 294 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */ 295 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */ 296 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */ 297 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */ 298 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */ 299 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */ 300 301 /* 302 * Arabic 303 * 304 * Modify to move Shadda (ccc=33) before other marks. See: 305 * https://unicode.org/faq/normalization.html#8 306 * https://unicode.org/faq/normalization.html#9 307 */ 308 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */ 309 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */ 310 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */ 311 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */ 312 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */ 313 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */ 314 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */ 315 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */ 316 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */ 317 318 /* Syriac */ 319 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */ 320 321 /* Telugu 322 * 323 * Modify Telugu length marks (ccc=84, ccc=91). 324 * These are the only matras in the main Indic scripts range that have 325 * a non-zero ccc. That makes them reorder with the Halant that is 326 * ccc=9. Just zero them, we don't need them in our Indic shaper. 327 */ 328 #define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */ 329 #define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */ 330 331 /* Thai 332 * 333 * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9). 334 * Assign 3, which is unassigned otherwise. 335 * Uniscribe does this reordering too. 336 */ 337 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */ 338 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */ 339 340 /* Lao */ 341 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */ 342 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */ 343 344 /* Tibetan 345 * 346 * In case of multiple vowel-signs, use u first (but after achung) 347 * this allows Dzongkha multi-vowel shortcuts to render correctly 348 */ 349 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */ 350 #define HB_MODIFIED_COMBINING_CLASS_CCC130 132 /* sign i */ 351 #define HB_MODIFIED_COMBINING_CLASS_CCC132 131 /* sign u */ 352 353 /* Misc */ 354 355 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \ 356 (FLAG_UNSAFE (gen_cat) & \ 357 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \ 358 FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \ 359 FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK))) 360 361 362 /* 363 * Ranges, used for bsearch tables. 364 */ 365 366 struct hb_unicode_range_t 367 { 368 static int 369 cmp (const void *_key, const void *_item) 370 { 371 hb_codepoint_t cp = *((hb_codepoint_t *) _key); 372 const hb_unicode_range_t *range = (hb_unicode_range_t *) _item; 373 374 if (cp < range->start) 375 return -1; 376 else if (cp <= range->end) 377 return 0; 378 else 379 return +1; 380 } 381 382 hb_codepoint_t start; 383 hb_codepoint_t end; 384 }; 385 386 /* 387 * Emoji. 388 */ 389 390 HB_INTERNAL bool 391 _hb_unicode_is_emoji_Extended_Pictographic (hb_codepoint_t cp); 392 393 394 #endif /* HB_UNICODE_HH */ 395
