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hb-unicode.hh (16921B)


      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 
     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 #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
    106  modified_combining_class (hb_codepoint_t u)
    107  {
    108    /* Reorder SAKOT to ensure it comes after any tone marks. */
    109    if (unlikely (u == 0x1A60u)) return 254;
    110    /* Reorder PADMA to ensure it comes after any vowel marks. */
    111    if (unlikely (u == 0x0FC6u)) return 254;
    112    /* Reorder TSA -PHRU to reorder before U+0F74 */
    113    if (unlikely (u == 0x0F39u)) return 127;
    114 
    115    return _hb_modified_combining_class[combining_class (u)];
    116  }
    117 
    118  static hb_bool_t
    119  is_variation_selector (hb_codepoint_t unicode)
    120  {
    121    /* U+180B..180D, U+180F MONGOLIAN FREE VARIATION SELECTORs are handled in the
    122     * Arabic shaper.  No need to match them here. */
    123    return unlikely (hb_in_ranges<hb_codepoint_t> (unicode,
    124 					   0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */
    125 					   0xE0100u, 0xE01EFu));  /* VARIATION SELECTOR-17..256 */
    126  }
    127 
    128  /* Default_Ignorable codepoints:
    129   *
    130   * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable,
    131   * we do NOT want to hide them, as the way Uniscribe has implemented them
    132   * is with regular spacing glyphs, and that's the way fonts are made to work.
    133   * As such, we make exceptions for those four.
    134   * Also ignoring U+1BCA0..1BCA3. https://github.com/harfbuzz/harfbuzz/issues/503
    135   *
    136   * Unicode 14.0:
    137   * $ grep '; Default_Ignorable_Code_Point ' DerivedCoreProperties.txt | sed 's/;.*#/#/'
    138   * 00AD          # Cf       SOFT HYPHEN
    139   * 034F          # Mn       COMBINING GRAPHEME JOINER
    140   * 061C          # Cf       ARABIC LETTER MARK
    141   * 115F..1160    # Lo   [2] HANGUL CHOSEONG FILLER..HANGUL JUNGSEONG FILLER
    142   * 17B4..17B5    # Mn   [2] KHMER VOWEL INHERENT AQ..KHMER VOWEL INHERENT AA
    143   * 180B..180D    # Mn   [3] MONGOLIAN FREE VARIATION SELECTOR ONE..MONGOLIAN FREE VARIATION SELECTOR THREE
    144   * 180E          # Cf       MONGOLIAN VOWEL SEPARATOR
    145   * 180F          # Mn       MONGOLIAN FREE VARIATION SELECTOR FOUR
    146   * 200B..200F    # Cf   [5] ZERO WIDTH SPACE..RIGHT-TO-LEFT MARK
    147   * 202A..202E    # Cf   [5] LEFT-TO-RIGHT EMBEDDING..RIGHT-TO-LEFT OVERRIDE
    148   * 2060..2064    # Cf   [5] WORD JOINER..INVISIBLE PLUS
    149   * 2065          # Cn       <reserved-2065>
    150   * 2066..206F    # Cf  [10] LEFT-TO-RIGHT ISOLATE..NOMINAL DIGIT SHAPES
    151   * 3164          # Lo       HANGUL FILLER
    152   * FE00..FE0F    # Mn  [16] VARIATION SELECTOR-1..VARIATION SELECTOR-16
    153   * FEFF          # Cf       ZERO WIDTH NO-BREAK SPACE
    154   * FFA0          # Lo       HALFWIDTH HANGUL FILLER
    155   * FFF0..FFF8    # Cn   [9] <reserved-FFF0>..<reserved-FFF8>
    156   * 1BCA0..1BCA3  # Cf   [4] SHORTHAND FORMAT LETTER OVERLAP..SHORTHAND FORMAT UP STEP
    157   * 1D173..1D17A  # Cf   [8] MUSICAL SYMBOL BEGIN BEAM..MUSICAL SYMBOL END PHRASE
    158   * E0000         # Cn       <reserved-E0000>
    159   * E0001         # Cf       LANGUAGE TAG
    160   * E0002..E001F  # Cn  [30] <reserved-E0002>..<reserved-E001F>
    161   * E0020..E007F  # Cf  [96] TAG SPACE..CANCEL TAG
    162   * E0080..E00FF  # Cn [128] <reserved-E0080>..<reserved-E00FF>
    163   * E0100..E01EF  # Mn [240] VARIATION SELECTOR-17..VARIATION SELECTOR-256
    164   * E01F0..E0FFF  # Cn [3600] <reserved-E01F0>..<reserved-E0FFF>
    165   */
    166  static hb_bool_t
    167  is_default_ignorable (hb_codepoint_t ch)
    168  {
    169    hb_codepoint_t plane = ch >> 16;
    170    if (likely (plane == 0))
    171    {
    172      /* BMP */
    173      hb_codepoint_t page = ch >> 8;
    174      switch (page) {
    175 case 0x00: return unlikely (ch == 0x00ADu);
    176 case 0x03: return unlikely (ch == 0x034Fu);
    177 case 0x06: return unlikely (ch == 0x061Cu);
    178 case 0x17: return hb_in_range<hb_codepoint_t> (ch, 0x17B4u, 0x17B5u);
    179 case 0x18: return hb_in_range<hb_codepoint_t> (ch, 0x180Bu, 0x180Eu);
    180 case 0x20: return hb_in_ranges<hb_codepoint_t> (ch, 0x200Bu, 0x200Fu,
    181 				    0x202Au, 0x202Eu,
    182 				    0x2060u, 0x206Fu);
    183 case 0xFE: return hb_in_range<hb_codepoint_t> (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu;
    184 case 0xFF: return hb_in_range<hb_codepoint_t> (ch, 0xFFF0u, 0xFFF8u);
    185 default: return false;
    186      }
    187    }
    188    else
    189    {
    190      /* Other planes */
    191      switch (plane) {
    192 case 0x01: return hb_in_range<hb_codepoint_t> (ch, 0x1D173u, 0x1D17Au);
    193 case 0x0E: return hb_in_range<hb_codepoint_t> (ch, 0xE0000u, 0xE0FFFu);
    194 default: return false;
    195      }
    196    }
    197  }
    198 
    199  /* Space estimates based on:
    200   * https://unicode.org/charts/PDF/U2000.pdf
    201   * https://docs.microsoft.com/en-us/typography/develop/character-design-standards/whitespace
    202   */
    203  enum space_t {
    204    NOT_SPACE = 0,
    205    SPACE_EM   = 1,
    206    SPACE_EM_2 = 2,
    207    SPACE_EM_3 = 3,
    208    SPACE_EM_4 = 4,
    209    SPACE_EM_5 = 5,
    210    SPACE_EM_6 = 6,
    211    SPACE_EM_16 = 16,
    212    SPACE_4_EM_18,	/* 4/18th of an EM! */
    213    SPACE,
    214    SPACE_FIGURE,
    215    SPACE_PUNCTUATION,
    216    SPACE_NARROW,
    217  };
    218  static space_t
    219  space_fallback_type (hb_codepoint_t u)
    220  {
    221    switch (u)
    222    {
    223      /* All GC=Zs chars that can use a fallback. */
    224      default:	    return NOT_SPACE;	/* U+1680 OGHAM SPACE MARK */
    225      case 0x0020u: return SPACE;	/* U+0020 SPACE */
    226      case 0x00A0u: return SPACE;	/* U+00A0 NO-BREAK SPACE */
    227      case 0x2000u: return SPACE_EM_2;	/* U+2000 EN QUAD */
    228      case 0x2001u: return SPACE_EM;	/* U+2001 EM QUAD */
    229      case 0x2002u: return SPACE_EM_2;	/* U+2002 EN SPACE */
    230      case 0x2003u: return SPACE_EM;	/* U+2003 EM SPACE */
    231      case 0x2004u: return SPACE_EM_3;	/* U+2004 THREE-PER-EM SPACE */
    232      case 0x2005u: return SPACE_EM_4;	/* U+2005 FOUR-PER-EM SPACE */
    233      case 0x2006u: return SPACE_EM_6;	/* U+2006 SIX-PER-EM SPACE */
    234      case 0x2007u: return SPACE_FIGURE;	/* U+2007 FIGURE SPACE */
    235      case 0x2008u: return SPACE_PUNCTUATION;	/* U+2008 PUNCTUATION SPACE */
    236      case 0x2009u: return SPACE_EM_5;		/* U+2009 THIN SPACE */
    237      case 0x200Au: return SPACE_EM_16;		/* U+200A HAIR SPACE */
    238      case 0x202Fu: return SPACE_NARROW;	/* U+202F NARROW NO-BREAK SPACE */
    239      case 0x205Fu: return SPACE_4_EM_18;	/* U+205F MEDIUM MATHEMATICAL SPACE */
    240      case 0x3000u: return SPACE_EM;		/* U+3000 IDEOGRAPHIC SPACE */
    241    }
    242  }
    243 
    244  static hb_codepoint_t
    245  vertical_char_for (hb_codepoint_t u)
    246  {
    247    switch (u >> 8)
    248    {
    249      case 0x20: switch (u) {
    250 case 0x2013u: return 0xfe32u; // EN DASH
    251 case 0x2014u: return 0xfe31u; // EM DASH
    252 case 0x2025u: return 0xfe30u; // TWO DOT LEADER
    253 case 0x2026u: return 0xfe19u; // HORIZONTAL ELLIPSIS
    254      } break;
    255      case 0x30: switch (u) {
    256 case 0x3001u: return 0xfe11u; // IDEOGRAPHIC COMMA
    257 case 0x3002u: return 0xfe12u; // IDEOGRAPHIC FULL STOP
    258 case 0x3008u: return 0xfe3fu; // LEFT ANGLE BRACKET
    259 case 0x3009u: return 0xfe40u; // RIGHT ANGLE BRACKET
    260 case 0x300au: return 0xfe3du; // LEFT DOUBLE ANGLE BRACKET
    261 case 0x300bu: return 0xfe3eu; // RIGHT DOUBLE ANGLE BRACKET
    262 case 0x300cu: return 0xfe41u; // LEFT CORNER BRACKET
    263 case 0x300du: return 0xfe42u; // RIGHT CORNER BRACKET
    264 case 0x300eu: return 0xfe43u; // LEFT WHITE CORNER BRACKET
    265 case 0x300fu: return 0xfe44u; // RIGHT WHITE CORNER BRACKET
    266 case 0x3010u: return 0xfe3bu; // LEFT BLACK LENTICULAR BRACKET
    267 case 0x3011u: return 0xfe3cu; // RIGHT BLACK LENTICULAR BRACKET
    268 case 0x3014u: return 0xfe39u; // LEFT TORTOISE SHELL BRACKET
    269 case 0x3015u: return 0xfe3au; // RIGHT TORTOISE SHELL BRACKET
    270 case 0x3016u: return 0xfe17u; // LEFT WHITE LENTICULAR BRACKET
    271 case 0x3017u: return 0xfe18u; // RIGHT WHITE LENTICULAR BRACKET
    272      } break;
    273      case 0xfe: switch (u) {
    274 case 0xfe4fu: return 0xfe34u; // WAVY LOW LINE
    275      } break;
    276      case 0xff: switch (u) {
    277 case 0xff01u: return 0xfe15u; // FULLWIDTH EXCLAMATION MARK
    278 case 0xff08u: return 0xfe35u; // FULLWIDTH LEFT PARENTHESIS
    279 case 0xff09u: return 0xfe36u; // FULLWIDTH RIGHT PARENTHESIS
    280 case 0xff0cu: return 0xfe10u; // FULLWIDTH COMMA
    281 case 0xff1au: return 0xfe13u; // FULLWIDTH COLON
    282 case 0xff1bu: return 0xfe14u; // FULLWIDTH SEMICOLON
    283 case 0xff1fu: return 0xfe16u; // FULLWIDTH QUESTION MARK
    284 case 0xff3bu: return 0xfe47u; // FULLWIDTH LEFT SQUARE BRACKET
    285 case 0xff3du: return 0xfe48u; // FULLWIDTH RIGHT SQUARE BRACKET
    286 case 0xff3fu: return 0xfe33u; // FULLWIDTH LOW LINE
    287 case 0xff5bu: return 0xfe37u; // FULLWIDTH LEFT CURLY BRACKET
    288 case 0xff5du: return 0xfe38u; // FULLWIDTH RIGHT CURLY BRACKET
    289      } break;
    290    }
    291 
    292    return u;
    293  }
    294 
    295  struct {
    296 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name;
    297    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
    298 #undef HB_UNICODE_FUNC_IMPLEMENT
    299  } func;
    300 
    301  struct {
    302 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name;
    303    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
    304 #undef HB_UNICODE_FUNC_IMPLEMENT
    305  } user_data;
    306 
    307  struct {
    308 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
    309    HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
    310 #undef HB_UNICODE_FUNC_IMPLEMENT
    311  } destroy;
    312 };
    313 DECLARE_NULL_INSTANCE (hb_unicode_funcs_t);
    314 
    315 
    316 /*
    317 * Modified combining marks
    318 */
    319 
    320 /* Hebrew
    321 *
    322 * We permute the "fixed-position" classes 10-26 into the order
    323 * described in the SBL Hebrew manual:
    324 *
    325 * https://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf
    326 *
    327 * (as recommended by:
    328 *  https://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering/msg22823/)
    329 *
    330 * More details here:
    331 * https://bugzilla.mozilla.org/show_bug.cgi?id=662055
    332 */
    333 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */
    334 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */
    335 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */
    336 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */
    337 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */
    338 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */
    339 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */
    340 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */
    341 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats & qamats qatan */
    342 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam & holam haser for vav*/
    343 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */
    344 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */
    345 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */
    346 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */
    347 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */
    348 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */
    349 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */
    350 
    351 /*
    352 * Arabic
    353 *
    354 * Modify to move Shadda (ccc=33) before other marks.  See:
    355 * https://unicode.org/faq/normalization.html#8
    356 * https://unicode.org/faq/normalization.html#9
    357 */
    358 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */
    359 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */
    360 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */
    361 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */
    362 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */
    363 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */
    364 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */
    365 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */
    366 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */
    367 
    368 /* Syriac */
    369 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */
    370 
    371 /* Telugu
    372 *
    373 * Modify Telugu length marks (ccc=84, ccc=91).
    374 * These are the only matras in the main Indic scripts range that have
    375 * a non-zero ccc.  That makes them reorder with the Halant (ccc=9).
    376 * Assign 4 and 5, which are otherwise unassigned.
    377 */
    378 #define HB_MODIFIED_COMBINING_CLASS_CCC84 4 /* length mark */
    379 #define HB_MODIFIED_COMBINING_CLASS_CCC91 5 /* ai length mark */
    380 
    381 /* Thai
    382 *
    383 * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9).
    384 * Assign 3, which is unassigned otherwise.
    385 * Uniscribe does this reordering too.
    386 */
    387 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */
    388 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */
    389 
    390 /* Lao */
    391 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */
    392 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */
    393 
    394 /* Tibetan
    395 *
    396 * In case of multiple vowel-signs, use u first (but after achung)
    397 * this allows Dzongkha multi-vowel shortcuts to render correctly
    398 */
    399 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */
    400 #define HB_MODIFIED_COMBINING_CLASS_CCC130 132 /* sign i */
    401 #define HB_MODIFIED_COMBINING_CLASS_CCC132 131 /* sign u */
    402 
    403 /* Misc */
    404 
    405 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \
    406 (FLAG_UNSAFE (gen_cat) & \
    407  (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
    408   FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \
    409   FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
    410 
    411 #define HB_UNICODE_GENERAL_CATEGORY_IS_LETTER(gen_cat) \
    412 (FLAG_UNSAFE (gen_cat) & \
    413  (FLAG (HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER) | \
    414   FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER) | \
    415   FLAG (HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER) | \
    416   FLAG (HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER) | \
    417   FLAG (HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER)))
    418 
    419 /*
    420 * Ranges, used for bsearch tables.
    421 */
    422 
    423 struct hb_unicode_range_t
    424 {
    425  static int
    426  cmp (const void *_key, const void *_item)
    427  {
    428    hb_codepoint_t cp = *((hb_codepoint_t *) _key);
    429    const hb_unicode_range_t *range = (hb_unicode_range_t *) _item;
    430 
    431    if (cp < range->start)
    432      return -1;
    433    else if (cp <= range->end)
    434      return 0;
    435    else
    436      return +1;
    437  }
    438 
    439  hb_codepoint_t start;
    440  hb_codepoint_t end;
    441 };
    442 
    443 /*
    444 * Emoji.
    445 */
    446 
    447 HB_INTERNAL bool
    448 _hb_unicode_is_emoji_Extended_Pictographic (hb_codepoint_t cp);
    449 
    450 
    451 extern "C" HB_INTERNAL hb_unicode_funcs_t *hb_ucd_get_unicode_funcs ();
    452 
    453 
    454 #endif /* HB_UNICODE_HH */