third_party/harfbuzz-ng/src/hb-unicode-private.hh

   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
  77   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
  85   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
  92   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
 106   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
 119     return _hb_modified_combining_class[combining_class (unicode)];
 120   }
 121
 122   static inline hb_bool_t
 123   is_variation_selector (hb_codepoint_t unicode)
 124   {
 125     /* U+180B..180D MONGOLIAN FREE VARIATION SELECTORs are handled in the
 126      * Arabic shaper.  No need to match them here. */
 127     return unlikely (hb_in_ranges (unicode,
 128                                    0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */
 129                                    0xE0100u, 0xE01EFu));  /* VARIATION SELECTOR-17..256 */
 130   }
 131
 132   /* Default_Ignorable codepoints:
 133    *
 134    * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable,
 135    * we do NOT want to hide them, as the way Uniscribe has implemented them
 136    * is with regular spacing glyphs, and that's the way fonts are made to work.
 137    * As such, we make exceptions for those four.
 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 inline hb_bool_t
 169   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 (ch, 0x17B4u, 0x17B5u);
 181         case 0x18: return hb_in_range (ch, 0x180Bu, 0x180Eu);
 182         case 0x20: return hb_in_ranges (ch, 0x200Bu, 0x200Fu,
 183                                                             0x202Au, 0x202Eu,
 184                                                             0x2060u, 0x206Fu);
 185         case 0xFE: return hb_in_range (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu;
 186         case 0xFF: return hb_in_range (ch, 0xFFF0u, 0xFFF8u);
 187         default: return false;
 188       }
 189     }
 190     else
 191     {
 192       /* Other planes */
 193       switch (plane) {
 194         case 0x01: return hb_in_ranges (ch, 0x1BCA0u, 0x1BCA3u,
 195                                             0x1D173u, 0x1D17Au);
 196         case 0x0E: return hb_in_range (ch, 0xE0000u, 0xE0FFFu);
 197         default: return false;
 198       }
 199     }
 200   }
 201
 202
 203   struct {
 204 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name;
 205     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 206 #undef HB_UNICODE_FUNC_IMPLEMENT
 207   } func;
 208
 209   struct {
 210 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name;
 211     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 212 #undef HB_UNICODE_FUNC_IMPLEMENT
 213   } user_data;
 214
 215   struct {
 216 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
 217     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 218 #undef HB_UNICODE_FUNC_IMPLEMENT
 219   } destroy;
 220 };
 221
 222
 223 extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil;
 224
 225
 226 /* Modified combining marks */
 227
 228 /* Hebrew
 229  *
 230  * We permute the "fixed-position" classes 10-26 into the order
 231  * described in the SBL Hebrew manual:
 232  *
 233  * http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf
 234  *
 235  * (as recommended by:
 236  *  http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html)
 237  *
 238  * More details here:
 239  * https://bugzilla.mozilla.org/show_bug.cgi?id=662055
 240  */
 241 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */
 242 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */
 243 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */
 244 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */
 245 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */
 246 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */
 247 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */
 248 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */
 249 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */
 250 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */
 251 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */
 252 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */
 253 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */
 254 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */
 255 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */
 256 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */
 257 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */
 258
 259 /*
 260  * Arabic
 261  *
 262  * Modify to move Shadda (ccc=33) before other marks.  See:
 263  * http://unicode.org/faq/normalization.html#8
 264  * http://unicode.org/faq/normalization.html#9
 265  */
 266 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */
 267 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */
 268 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */
 269 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */
 270 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */
 271 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */
 272 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */
 273 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */
 274 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */
 275
 276 /* Syriac */
 277 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */
 278
 279 /* Telugu
 280  *
 281  * Modify Telugu length marks (ccc=84, ccc=91).
 282  * These are the only matras in the main Indic scripts range that have
 283  * a non-zero ccc.  That makes them reorder with the Halant that is
 284  * ccc=9.  Just zero them, we don't need them in our Indic shaper.
 285  */
 286 #define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */
 287 #define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */
 288
 289 /* Thai
 290  *
 291  * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9).
 292  * Assign 3, which is unassigned otherwise.
 293  * Uniscribe does this reordering too.
 294  */
 295 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */
 296 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */
 297
 298 /* Lao */
 299 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */
 300 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */
 301
 302 /* Tibetan */
 303 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */
 304 #define HB_MODIFIED_COMBINING_CLASS_CCC130 130 /* sign i */
 305 #define HB_MODIFIED_COMBINING_CLASS_CCC132 132 /* sign u */
 306
 307
 308 /* Misc */
 309
 310 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \
 311         (FLAG_SAFE (gen_cat) & \
 312          (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
 313           FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \
 314           FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
 315
 316
 317 #endif /* HB_UNICODE_PRIVATE_HH */