third_party/harfbuzz-ng/src/hb-glib.cc

   1 /*
   2  * Copyright © 2009  Red Hat, Inc.
   3  * Copyright © 2011  Google, Inc.
   4  *
   5  *  This is part of HarfBuzz, a text shaping library.
   6  *
   7  * Permission is hereby granted, without written agreement and without
   8  * license or royalty fees, to use, copy, modify, and distribute this
   9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  *
  25  * Red Hat Author(s): Behdad Esfahbod
  26  * Google Author(s): Behdad Esfahbod
  27  */
  28
  29 #include "hb-private.hh"
  30
  31 #include "hb-glib.h"
  32
  33 #include "hb-unicode-private.hh"
  34
  35
  36 #if !GLIB_CHECK_VERSION(2,29,14)
  37 static const hb_script_t
  38 glib_script_to_script[] =
  39 {
  40   HB_SCRIPT_COMMON,
  41   HB_SCRIPT_INHERITED,
  42   HB_SCRIPT_ARABIC,
  43   HB_SCRIPT_ARMENIAN,
  44   HB_SCRIPT_BENGALI,
  45   HB_SCRIPT_BOPOMOFO,
  46   HB_SCRIPT_CHEROKEE,
  47   HB_SCRIPT_COPTIC,
  48   HB_SCRIPT_CYRILLIC,
  49   HB_SCRIPT_DESERET,
  50   HB_SCRIPT_DEVANAGARI,
  51   HB_SCRIPT_ETHIOPIC,
  52   HB_SCRIPT_GEORGIAN,
  53   HB_SCRIPT_GOTHIC,
  54   HB_SCRIPT_GREEK,
  55   HB_SCRIPT_GUJARATI,
  56   HB_SCRIPT_GURMUKHI,
  57   HB_SCRIPT_HAN,
  58   HB_SCRIPT_HANGUL,
  59   HB_SCRIPT_HEBREW,
  60   HB_SCRIPT_HIRAGANA,
  61   HB_SCRIPT_KANNADA,
  62   HB_SCRIPT_KATAKANA,
  63   HB_SCRIPT_KHMER,
  64   HB_SCRIPT_LAO,
  65   HB_SCRIPT_LATIN,
  66   HB_SCRIPT_MALAYALAM,
  67   HB_SCRIPT_MONGOLIAN,
  68   HB_SCRIPT_MYANMAR,
  69   HB_SCRIPT_OGHAM,
  70   HB_SCRIPT_OLD_ITALIC,
  71   HB_SCRIPT_ORIYA,
  72   HB_SCRIPT_RUNIC,
  73   HB_SCRIPT_SINHALA,
  74   HB_SCRIPT_SYRIAC,
  75   HB_SCRIPT_TAMIL,
  76   HB_SCRIPT_TELUGU,
  77   HB_SCRIPT_THAANA,
  78   HB_SCRIPT_THAI,
  79   HB_SCRIPT_TIBETAN,
  80   HB_SCRIPT_CANADIAN_SYLLABICS,
  81   HB_SCRIPT_YI,
  82   HB_SCRIPT_TAGALOG,
  83   HB_SCRIPT_HANUNOO,
  84   HB_SCRIPT_BUHID,
  85   HB_SCRIPT_TAGBANWA,
  86
  87   /* Unicode-4.0 additions */
  88   HB_SCRIPT_BRAILLE,
  89   HB_SCRIPT_CYPRIOT,
  90   HB_SCRIPT_LIMBU,
  91   HB_SCRIPT_OSMANYA,
  92   HB_SCRIPT_SHAVIAN,
  93   HB_SCRIPT_LINEAR_B,
  94   HB_SCRIPT_TAI_LE,
  95   HB_SCRIPT_UGARITIC,
  96
  97   /* Unicode-4.1 additions */
  98   HB_SCRIPT_NEW_TAI_LUE,
  99   HB_SCRIPT_BUGINESE,
 100   HB_SCRIPT_GLAGOLITIC,
 101   HB_SCRIPT_TIFINAGH,
 102   HB_SCRIPT_SYLOTI_NAGRI,
 103   HB_SCRIPT_OLD_PERSIAN,
 104   HB_SCRIPT_KHAROSHTHI,
 105
 106   /* Unicode-5.0 additions */
 107   HB_SCRIPT_UNKNOWN,
 108   HB_SCRIPT_BALINESE,
 109   HB_SCRIPT_CUNEIFORM,
 110   HB_SCRIPT_PHOENICIAN,
 111   HB_SCRIPT_PHAGS_PA,
 112   HB_SCRIPT_NKO,
 113
 114   /* Unicode-5.1 additions */
 115   HB_SCRIPT_KAYAH_LI,
 116   HB_SCRIPT_LEPCHA,
 117   HB_SCRIPT_REJANG,
 118   HB_SCRIPT_SUNDANESE,
 119   HB_SCRIPT_SAURASHTRA,
 120   HB_SCRIPT_CHAM,
 121   HB_SCRIPT_OL_CHIKI,
 122   HB_SCRIPT_VAI,
 123   HB_SCRIPT_CARIAN,
 124   HB_SCRIPT_LYCIAN,
 125   HB_SCRIPT_LYDIAN,
 126
 127   /* Unicode-5.2 additions */
 128   HB_SCRIPT_AVESTAN,
 129   HB_SCRIPT_BAMUM,
 130   HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
 131   HB_SCRIPT_IMPERIAL_ARAMAIC,
 132   HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
 133   HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
 134   HB_SCRIPT_JAVANESE,
 135   HB_SCRIPT_KAITHI,
 136   HB_SCRIPT_TAI_THAM,
 137   HB_SCRIPT_LISU,
 138   HB_SCRIPT_MEETEI_MAYEK,
 139   HB_SCRIPT_OLD_SOUTH_ARABIAN,
 140   HB_SCRIPT_OLD_TURKIC,
 141   HB_SCRIPT_SAMARITAN,
 142   HB_SCRIPT_TAI_VIET,
 143
 144   /* Unicode-6.0 additions */
 145   HB_SCRIPT_BATAK,
 146   HB_SCRIPT_BRAHMI,
 147   HB_SCRIPT_MANDAIC,
 148
 149   /* Unicode-6.1 additions */
 150   HB_SCRIPT_CHAKMA,
 151   HB_SCRIPT_MEROITIC_CURSIVE,
 152   HB_SCRIPT_MEROITIC_HIEROGLYPHS,
 153   HB_SCRIPT_MIAO,
 154   HB_SCRIPT_SHARADA,
 155   HB_SCRIPT_SORA_SOMPENG,
 156   HB_SCRIPT_TAKRI
 157 };
 158 #endif
 159
 160 hb_script_t
 161 hb_glib_script_to_script (GUnicodeScript script)
 162 {
 163 #if GLIB_CHECK_VERSION(2,29,14)
 164   return (hb_script_t) g_unicode_script_to_iso15924 (script);
 165 #else
 166   if (likely ((unsigned int) script < ARRAY_LENGTH (glib_script_to_script)))
 167     return glib_script_to_script[script];
 168
 169   if (unlikely (script == G_UNICODE_SCRIPT_INVALID_CODE))
 170     return HB_SCRIPT_INVALID;
 171
 172   return HB_SCRIPT_UNKNOWN;
 173 #endif
 174 }
 175
 176 GUnicodeScript
 177 hb_glib_script_from_script (hb_script_t script)
 178 {
 179 #if GLIB_CHECK_VERSION(2,29,14)
 180   return g_unicode_script_from_iso15924 (script);
 181 #else
 182   unsigned int count = ARRAY_LENGTH (glib_script_to_script);
 183   for (unsigned int i = 0; i < count; i++)
 184     if (glib_script_to_script[i] == script)
 185       return (GUnicodeScript) i;
 186
 187   if (unlikely (script == HB_SCRIPT_INVALID))
 188     return G_UNICODE_SCRIPT_INVALID_CODE;
 189
 190   return G_UNICODE_SCRIPT_UNKNOWN;
 191 #endif
 192 }
 193
 194
 195 static hb_unicode_combining_class_t
 196 hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 197                                  hb_codepoint_t      unicode,
 198                                  void               *user_data HB_UNUSED)
 199
 200 {
 201   return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
 202 }
 203
 204 static unsigned int
 205 hb_glib_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 206                                  hb_codepoint_t      unicode,
 207                                  void               *user_data HB_UNUSED)
 208 {
 209   return g_unichar_iswide (unicode) ? 2 : 1;
 210 }
 211
 212 static hb_unicode_general_category_t
 213 hb_glib_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 214                                   hb_codepoint_t      unicode,
 215                                   void               *user_data HB_UNUSED)
 216
 217 {
 218   /* hb_unicode_general_category_t and GUnicodeType are identical */
 219   return (hb_unicode_general_category_t) g_unichar_type (unicode);
 220 }
 221
 222 static hb_codepoint_t
 223 hb_glib_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 224                            hb_codepoint_t      unicode,
 225                            void               *user_data HB_UNUSED)
 226 {
 227   g_unichar_get_mirror_char (unicode, &unicode);
 228   return unicode;
 229 }
 230
 231 static hb_script_t
 232 hb_glib_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 233                         hb_codepoint_t      unicode,
 234                         void               *user_data HB_UNUSED)
 235 {
 236   return hb_glib_script_to_script (g_unichar_get_script (unicode));
 237 }
 238
 239 static hb_bool_t
 240 hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 241                          hb_codepoint_t      a,
 242                          hb_codepoint_t      b,
 243                          hb_codepoint_t     *ab,
 244                          void               *user_data HB_UNUSED)
 245 {
 246 #if GLIB_CHECK_VERSION(2,29,12)
 247   return g_unichar_compose (a, b, ab);
 248 #endif
 249
 250   /* We don't ifdef-out the fallback code such that compiler always
 251    * sees it and makes sure it's compilable. */
 252
 253   gchar utf8[12];
 254   gchar *normalized;
 255   int len;
 256   hb_bool_t ret;
 257
 258   len = g_unichar_to_utf8 (a, utf8);
 259   len += g_unichar_to_utf8 (b, utf8 + len);
 260   normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFC);
 261   len = g_utf8_strlen (normalized, -1);
 262   if (unlikely (!len))
 263     return false;
 264
 265   if (len == 1) {
 266     *ab = g_utf8_get_char (normalized);
 267     ret = true;
 268   } else {
 269     ret = false;
 270   }
 271
 272   g_free (normalized);
 273   return ret;
 274 }
 275
 276 static hb_bool_t
 277 hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 278                            hb_codepoint_t      ab,
 279                            hb_codepoint_t     *a,
 280                            hb_codepoint_t     *b,
 281                            void               *user_data HB_UNUSED)
 282 {
 283 #if GLIB_CHECK_VERSION(2,29,12)
 284   return g_unichar_decompose (ab, a, b);
 285 #endif
 286
 287   /* We don't ifdef-out the fallback code such that compiler always
 288    * sees it and makes sure it's compilable. */
 289
 290   gchar utf8[6];
 291   gchar *normalized;
 292   int len;
 293   hb_bool_t ret;
 294
 295   len = g_unichar_to_utf8 (ab, utf8);
 296   normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFD);
 297   len = g_utf8_strlen (normalized, -1);
 298   if (unlikely (!len))
 299     return false;
 300
 301   if (len == 1) {
 302     *a = g_utf8_get_char (normalized);
 303     *b = 0;
 304     ret = *a != ab;
 305   } else if (len == 2) {
 306     *a = g_utf8_get_char (normalized);
 307     *b = g_utf8_get_char (g_utf8_next_char (normalized));
 308     /* Here's the ugly part: if ab decomposes to a single character and
 309      * that character decomposes again, we have to detect that and undo
 310      * the second part :-(. */
 311     gchar *recomposed = g_utf8_normalize (normalized, -1, G_NORMALIZE_NFC);
 312     hb_codepoint_t c = g_utf8_get_char (recomposed);
 313     if (c != ab && c != *a) {
 314       *a = c;
 315       *b = 0;
 316     }
 317     g_free (recomposed);
 318     ret = true;
 319   } else {
 320     /* If decomposed to more than two characters, take the last one,
 321      * and recompose the rest to get the first component. */
 322     gchar *end = g_utf8_offset_to_pointer (normalized, len - 1);
 323     gchar *recomposed;
 324     *b = g_utf8_get_char (end);
 325     recomposed = g_utf8_normalize (normalized, end - normalized, G_NORMALIZE_NFC);
 326     /* We expect that recomposed has exactly one character now. */
 327     *a = g_utf8_get_char (recomposed);
 328     g_free (recomposed);
 329     ret = true;
 330   }
 331
 332   g_free (normalized);
 333   return ret;
 334 }
 335
 336 static unsigned int
 337 hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 338                                          hb_codepoint_t      u,
 339                                          hb_codepoint_t     *decomposed,
 340                                          void               *user_data HB_UNUSED)
 341 {
 342 #if GLIB_CHECK_VERSION(2,29,12)
 343   return g_unichar_fully_decompose (u, TRUE, decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN);
 344 #endif
 345
 346   /* If the user doesn't have GLib >= 2.29.12 we have to perform
 347    * a round trip to UTF-8 and the associated memory management dance. */
 348   gchar utf8[6];
 349   gchar *utf8_decomposed, *c;
 350   gsize utf8_len, utf8_decomposed_len, i;
 351
 352   /* Convert @u to UTF-8 and normalise it in NFKD mode. This performs the compatibility decomposition. */
 353   utf8_len = g_unichar_to_utf8 (u, utf8);
 354   utf8_decomposed = g_utf8_normalize (utf8, utf8_len, G_NORMALIZE_NFKD);
 355   utf8_decomposed_len = g_utf8_strlen (utf8_decomposed, -1);
 356
 357   assert (utf8_decomposed_len <= HB_UNICODE_MAX_DECOMPOSITION_LEN);
 358
 359   for (i = 0, c = utf8_decomposed; i < utf8_decomposed_len; i++, c = g_utf8_next_char (c))
 360     *decomposed++ = g_utf8_get_char (c);
 361
 362   g_free (utf8_decomposed);
 363
 364   return utf8_decomposed_len;
 365 }
 366
 367 hb_unicode_funcs_t *
 368 hb_glib_get_unicode_funcs (void)
 369 {
 370   static const hb_unicode_funcs_t _hb_glib_unicode_funcs = {
 371     HB_OBJECT_HEADER_STATIC,
 372
 373     NULL, /* parent */
 374     true, /* immutable */
 375     {
 376 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_glib_unicode_##name,
 377       HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 378 #undef HB_UNICODE_FUNC_IMPLEMENT
 379     }
 380   };
 381
 382   return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
 383 }
 384