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_PRIVATE_HH 32 #define HB_UNICODE_PRIVATE_HH 33 34 #include "hb-private.hh" 35 #include "hb-object-private.hh" 36 37 38 extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256]; 39 40 /* 41 * hb_unicode_funcs_t 42 */ 43 44 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \ 45 HB_UNICODE_FUNC_IMPLEMENT (combining_class) \ 46 HB_UNICODE_FUNC_IMPLEMENT (eastasian_width) \ 47 HB_UNICODE_FUNC_IMPLEMENT (general_category) \ 48 HB_UNICODE_FUNC_IMPLEMENT (mirroring) \ 49 HB_UNICODE_FUNC_IMPLEMENT (script) \ 50 HB_UNICODE_FUNC_IMPLEMENT (compose) \ 51 HB_UNICODE_FUNC_IMPLEMENT (decompose) \ 52 HB_UNICODE_FUNC_IMPLEMENT (decompose_compatibility) \ 53 /* ^--- Add new callbacks here */ 54 55 /* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */ 56 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \ 57 HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_combining_class_t, combining_class) \ 58 HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width) \ 59 HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \ 60 HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \ 61 HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \ 62 /* ^--- Add new simple callbacks here */ 63 64 struct hb_unicode_funcs_t { 65 hb_object_header_t header; 66 ASSERT_POD (); 67 68 hb_unicode_funcs_t *parent; 69 70 bool immutable; 71 72 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \ 73 inline return_type name (hb_codepoint_t unicode) { return func.name (this, unicode, user_data.name); } 74 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE 75 #undef HB_UNICODE_FUNC_IMPLEMENT 76 composehb_unicode_funcs_t77 inline hb_bool_t compose (hb_codepoint_t a, hb_codepoint_t b, 78 hb_codepoint_t *ab) 79 { 80 *ab = 0; 81 if (unlikely (!a || !b)) return false; 82 return func.compose (this, a, b, ab, user_data.compose); 83 } 84 decomposehb_unicode_funcs_t85 inline hb_bool_t decompose (hb_codepoint_t ab, 86 hb_codepoint_t *a, hb_codepoint_t *b) 87 { 88 *a = ab; *b = 0; 89 return func.decompose (this, ab, a, b, user_data.decompose); 90 } 91 decompose_compatibilityhb_unicode_funcs_t92 inline unsigned int decompose_compatibility (hb_codepoint_t u, 93 hb_codepoint_t *decomposed) 94 { 95 unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility); 96 if (ret == 1 && u == decomposed[0]) { 97 decomposed[0] = 0; 98 return 0; 99 } 100 decomposed[ret] = 0; 101 return ret; 102 } 103 104 105 inline unsigned int modified_combining_classhb_unicode_funcs_t106 modified_combining_class (hb_codepoint_t unicode) 107 { 108 /* XXX This hack belongs to the Myanmar shaper. */ 109 if (unlikely (unicode == 0x1037u)) unicode = 0x103Au; 110 111 /* XXX This hack belongs to the SEA shaper (for Tai Tham): 112 * Reorder SAKOT to ensure it comes after any tone marks. */ 113 if (unlikely (unicode == 0x1A60u)) return 254; 114 115 /* XXX This hack belongs to the Tibetan shaper: 116 * Reorder PADMA to ensure it comes after any vowel marks. */ 117 if (unlikely (unicode == 0x0FC6u)) return 254; 118 /* Reorder TSA -PHRU to reorder before U+0F74 */ 119 if (unlikely (unicode == 0x0F39u)) return 127; 120 121 return _hb_modified_combining_class[combining_class (unicode)]; 122 } 123 124 static inline hb_bool_t is_variation_selectorhb_unicode_funcs_t125 is_variation_selector (hb_codepoint_t unicode) 126 { 127 /* U+180B..180D MONGOLIAN FREE VARIATION SELECTORs are handled in the 128 * Arabic shaper. No need to match them here. */ 129 return unlikely (hb_in_ranges (unicode, 130 0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */ 131 0xE0100u, 0xE01EFu)); /* VARIATION SELECTOR-17..256 */ 132 } 133 134 /* Default_Ignorable codepoints: 135 * 136 * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable, 137 * we do NOT want to hide them, as the way Uniscribe has implemented them 138 * is with regular spacing glyphs, and that's the way fonts are made to work. 139 * As such, we make exceptions for those four. 140 * 141 * Unicode 7.0: 142 * $ grep '; Default_Ignorable_Code_Point ' DerivedCoreProperties.txt | sed 's/;.*#/#/' 143 * 00AD # Cf SOFT HYPHEN 144 * 034F # Mn COMBINING GRAPHEME JOINER 145 * 061C # Cf ARABIC LETTER MARK 146 * 115F..1160 # Lo [2] HANGUL CHOSEONG FILLER..HANGUL JUNGSEONG FILLER 147 * 17B4..17B5 # Mn [2] KHMER VOWEL INHERENT AQ..KHMER VOWEL INHERENT AA 148 * 180B..180D # Mn [3] MONGOLIAN FREE VARIATION SELECTOR ONE..MONGOLIAN FREE VARIATION SELECTOR THREE 149 * 180E # Cf MONGOLIAN VOWEL SEPARATOR 150 * 200B..200F # Cf [5] ZERO WIDTH SPACE..RIGHT-TO-LEFT MARK 151 * 202A..202E # Cf [5] LEFT-TO-RIGHT EMBEDDING..RIGHT-TO-LEFT OVERRIDE 152 * 2060..2064 # Cf [5] WORD JOINER..INVISIBLE PLUS 153 * 2065 # Cn <reserved-2065> 154 * 2066..206F # Cf [10] LEFT-TO-RIGHT ISOLATE..NOMINAL DIGIT SHAPES 155 * 3164 # Lo HANGUL FILLER 156 * FE00..FE0F # Mn [16] VARIATION SELECTOR-1..VARIATION SELECTOR-16 157 * FEFF # Cf ZERO WIDTH NO-BREAK SPACE 158 * FFA0 # Lo HALFWIDTH HANGUL FILLER 159 * FFF0..FFF8 # Cn [9] <reserved-FFF0>..<reserved-FFF8> 160 * 1BCA0..1BCA3 # Cf [4] SHORTHAND FORMAT LETTER OVERLAP..SHORTHAND FORMAT UP STEP 161 * 1D173..1D17A # Cf [8] MUSICAL SYMBOL BEGIN BEAM..MUSICAL SYMBOL END PHRASE 162 * E0000 # Cn <reserved-E0000> 163 * E0001 # Cf LANGUAGE TAG 164 * E0002..E001F # Cn [30] <reserved-E0002>..<reserved-E001F> 165 * E0020..E007F # Cf [96] TAG SPACE..CANCEL TAG 166 * E0080..E00FF # Cn [128] <reserved-E0080>..<reserved-E00FF> 167 * E0100..E01EF # Mn [240] VARIATION SELECTOR-17..VARIATION SELECTOR-256 168 * E01F0..E0FFF # Cn [3600] <reserved-E01F0>..<reserved-E0FFF> 169 */ 170 static inline hb_bool_t is_default_ignorablehb_unicode_funcs_t171 is_default_ignorable (hb_codepoint_t ch) 172 { 173 hb_codepoint_t plane = ch >> 16; 174 if (likely (plane == 0)) 175 { 176 /* BMP */ 177 hb_codepoint_t page = ch >> 8; 178 switch (page) { 179 case 0x00: return unlikely (ch == 0x00ADu); 180 case 0x03: return unlikely (ch == 0x034Fu); 181 case 0x06: return unlikely (ch == 0x061Cu); 182 case 0x17: return hb_in_range (ch, 0x17B4u, 0x17B5u); 183 case 0x18: return hb_in_range (ch, 0x180Bu, 0x180Eu); 184 case 0x20: return hb_in_ranges (ch, 0x200Bu, 0x200Fu, 185 0x202Au, 0x202Eu, 186 0x2060u, 0x206Fu); 187 case 0xFE: return hb_in_range (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu; 188 case 0xFF: return hb_in_range (ch, 0xFFF0u, 0xFFF8u); 189 default: return false; 190 } 191 } 192 else 193 { 194 /* Other planes */ 195 switch (plane) { 196 case 0x01: return hb_in_ranges (ch, 0x1BCA0u, 0x1BCA3u, 197 0x1D173u, 0x1D17Au); 198 case 0x0E: return hb_in_range (ch, 0xE0000u, 0xE0FFFu); 199 default: return false; 200 } 201 } 202 } 203 204 /* Space estimates based on: 205 * http://www.unicode.org/charts/PDF/U2000.pdf 206 * https://www.microsoft.com/typography/developers/fdsspec/spaces.aspx 207 */ 208 enum space_t { 209 NOT_SPACE = 0, 210 SPACE_EM = 1, 211 SPACE_EM_2 = 2, 212 SPACE_EM_3 = 3, 213 SPACE_EM_4 = 4, 214 SPACE_EM_5 = 5, 215 SPACE_EM_6 = 6, 216 SPACE_EM_16 = 16, 217 SPACE_4_EM_18, /* 4/18th of an EM! */ 218 SPACE, 219 SPACE_FIGURE, 220 SPACE_PUNCTUATION, 221 SPACE_NARROW, 222 }; 223 static inline space_t space_fallback_typehb_unicode_funcs_t224 space_fallback_type (hb_codepoint_t u) 225 { 226 switch (u) 227 { 228 /* All GC=Zs chars that can use a fallback. */ 229 default: return NOT_SPACE; /* U+1680 OGHAM SPACE MARK */ 230 case 0x0020u: return SPACE; /* U+0020 SPACE */ 231 case 0x00A0u: return SPACE; /* U+00A0 NO-BREAK SPACE */ 232 case 0x2000u: return SPACE_EM_2; /* U+2000 EN QUAD */ 233 case 0x2001u: return SPACE_EM; /* U+2001 EM QUAD */ 234 case 0x2002u: return SPACE_EM_2; /* U+2002 EN SPACE */ 235 case 0x2003u: return SPACE_EM; /* U+2003 EM SPACE */ 236 case 0x2004u: return SPACE_EM_3; /* U+2004 THREE-PER-EM SPACE */ 237 case 0x2005u: return SPACE_EM_4; /* U+2005 FOUR-PER-EM SPACE */ 238 case 0x2006u: return SPACE_EM_6; /* U+2006 SIX-PER-EM SPACE */ 239 case 0x2007u: return SPACE_FIGURE; /* U+2007 FIGURE SPACE */ 240 case 0x2008u: return SPACE_PUNCTUATION; /* U+2008 PUNCTUATION SPACE */ 241 case 0x2009u: return SPACE_EM_5; /* U+2009 THIN SPACE */ 242 case 0x200Au: return SPACE_EM_16; /* U+200A HAIR SPACE */ 243 case 0x202Fu: return SPACE_NARROW; /* U+202F NARROW NO-BREAK SPACE */ 244 case 0x205Fu: return SPACE_4_EM_18; /* U+205F MEDIUM MATHEMATICAL SPACE */ 245 case 0x3000u: return SPACE_EM; /* U+3000 IDEOGRAPHIC SPACE */ 246 } 247 } 248 249 struct { 250 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name; 251 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 252 #undef HB_UNICODE_FUNC_IMPLEMENT 253 } func; 254 255 struct { 256 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name; 257 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 258 #undef HB_UNICODE_FUNC_IMPLEMENT 259 } user_data; 260 261 struct { 262 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name; 263 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS 264 #undef HB_UNICODE_FUNC_IMPLEMENT 265 } destroy; 266 }; 267 268 269 extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil; 270 271 272 /* Modified combining marks */ 273 274 /* Hebrew 275 * 276 * We permute the "fixed-position" classes 10-26 into the order 277 * described in the SBL Hebrew manual: 278 * 279 * http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf 280 * 281 * (as recommended by: 282 * http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html) 283 * 284 * More details here: 285 * https://bugzilla.mozilla.org/show_bug.cgi?id=662055 286 */ 287 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */ 288 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */ 289 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */ 290 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */ 291 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */ 292 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */ 293 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */ 294 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */ 295 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */ 296 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */ 297 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */ 298 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */ 299 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */ 300 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */ 301 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */ 302 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */ 303 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */ 304 305 /* 306 * Arabic 307 * 308 * Modify to move Shadda (ccc=33) before other marks. See: 309 * http://unicode.org/faq/normalization.html#8 310 * http://unicode.org/faq/normalization.html#9 311 */ 312 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */ 313 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */ 314 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */ 315 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */ 316 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */ 317 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */ 318 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */ 319 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */ 320 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */ 321 322 /* Syriac */ 323 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */ 324 325 /* Telugu 326 * 327 * Modify Telugu length marks (ccc=84, ccc=91). 328 * These are the only matras in the main Indic scripts range that have 329 * a non-zero ccc. That makes them reorder with the Halant that is 330 * ccc=9. Just zero them, we don't need them in our Indic shaper. 331 */ 332 #define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */ 333 #define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */ 334 335 /* Thai 336 * 337 * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9). 338 * Assign 3, which is unassigned otherwise. 339 * Uniscribe does this reordering too. 340 */ 341 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */ 342 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */ 343 344 /* Lao */ 345 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */ 346 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */ 347 348 /* Tibetan 349 * Modify U+0F74 (ccc=132) to reorder before ccc=130 marks. 350 */ 351 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */ 352 #define HB_MODIFIED_COMBINING_CLASS_CCC130 130 /* sign i */ 353 #define HB_MODIFIED_COMBINING_CLASS_CCC132 128 /* sign u */ 354 355 356 /* Misc */ 357 358 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \ 359 (FLAG_SAFE (gen_cat) & \ 360 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \ 361 FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \ 362 FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK))) 363 364 #define HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK_OR_MODIFIER_SYMBOL(gen_cat) \ 365 (FLAG_SAFE (gen_cat) & \ 366 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \ 367 FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) | \ 368 FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL))) 369 370 #endif /* HB_UNICODE_PRIVATE_HH */ 371