dali-windows-backend/ExInclude/harfbuzz/hb-common.h

   1 /*
   2  * Copyright © 2007,2008,2009  Red Hat, Inc.
   3  * Copyright © 2011,2012  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 #ifndef HB_H_IN
  30 #error "Include <hb.h> instead."
  31 #endif
  32
  33 #ifndef HB_COMMON_H
  34 #define HB_COMMON_H
  35
  36 #ifndef HB_BEGIN_DECLS
  37 # ifdef __cplusplus
  38 #  define HB_BEGIN_DECLS        extern "C" {
  39 #  define HB_END_DECLS          }
  40 # else /* !__cplusplus */
  41 #  define HB_BEGIN_DECLS
  42 #  define HB_END_DECLS
  43 # endif /* !__cplusplus */
  44 #endif
  45
  46 #if !defined (HB_DONT_DEFINE_STDINT)
  47
  48 #if defined (_SVR4) || defined (SVR4) || defined (__OpenBSD__) || \
  49     defined (_sgi) || defined (__sun) || defined (sun) || \
  50     defined (__digital__) || defined (__HP_cc)
  51 #  include <inttypes.h>
  52 #elif defined (_AIX)
  53 #  include <sys/inttypes.h>
  54 /* VS 2010 (_MSC_VER 1600) has stdint.h */
  55 #elif defined (_MSC_VER) && _MSC_VER < 1600
  56 typedef __int8 int8_t;
  57 typedef unsigned __int8 uint8_t;
  58 typedef __int16 int16_t;
  59 typedef unsigned __int16 uint16_t;
  60 typedef __int32 int32_t;
  61 typedef unsigned __int32 uint32_t;
  62 typedef __int64 int64_t;
  63 typedef unsigned __int64 uint64_t;
  64 #else
  65 #  include <stdint.h>
  66 #endif
  67
  68 #endif
  69
  70 HB_BEGIN_DECLS
  71
  72
  73 typedef int hb_bool_t;
  74
  75 typedef uint32_t hb_codepoint_t;
  76 typedef int32_t hb_position_t;
  77 typedef uint32_t hb_mask_t;
  78
  79 typedef union _hb_var_int_t {
  80   uint32_t u32;
  81   int32_t i32;
  82   uint16_t u16[2];
  83   int16_t i16[2];
  84   uint8_t u8[4];
  85   int8_t i8[4];
  86 } hb_var_int_t;
  87
  88
  89 /* hb_tag_t */
  90
  91 typedef uint32_t hb_tag_t;
  92
  93 #define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint8_t)(c1))<<24)|(((uint8_t)(c2))<<16)|(((uint8_t)(c3))<<8)|((uint8_t)(c4))))
  94 #define HB_UNTAG(tag)   ((uint8_t)((tag)>>24)), ((uint8_t)((tag)>>16)), ((uint8_t)((tag)>>8)), ((uint8_t)(tag))
  95
  96 #define HB_TAG_NONE HB_TAG(0,0,0,0)
  97 #define HB_TAG_MAX HB_TAG(0xff,0xff,0xff,0xff)
  98 #define HB_TAG_MAX_SIGNED HB_TAG(0x7f,0xff,0xff,0xff)
  99
 100 /* len=-1 means str is NUL-terminated. */
 101 HB_EXTERN hb_tag_t
 102 hb_tag_from_string (const char *str, int len);
 103
 104 /* buf should have 4 bytes. */
 105 HB_EXTERN void
 106 hb_tag_to_string (hb_tag_t tag, char *buf);
 107
 108
 109 /**
 110  * hb_direction_t:
 111  * @HB_DIRECTION_INVALID: Initial, unset direction.
 112  * @HB_DIRECTION_LTR: Text is set horizontally from left to right.
 113  * @HB_DIRECTION_RTL: Text is set horizontally from right to left.
 114  * @HB_DIRECTION_TTB: Text is set vertically from top to bottom.
 115  * @HB_DIRECTION_BTT: Text is set vertically from bottom to top.
 116  */
 117 typedef enum {
 118   HB_DIRECTION_INVALID = 0,
 119   HB_DIRECTION_LTR = 4,
 120   HB_DIRECTION_RTL,
 121   HB_DIRECTION_TTB,
 122   HB_DIRECTION_BTT
 123 } hb_direction_t;
 124
 125 /* len=-1 means str is NUL-terminated */
 126 HB_EXTERN hb_direction_t
 127 hb_direction_from_string (const char *str, int len);
 128
 129 HB_EXTERN const char *
 130 hb_direction_to_string (hb_direction_t direction);
 131
 132 #define HB_DIRECTION_IS_VALID(dir)      ((((unsigned int) (dir)) & ~3U) == 4)
 133 /* Direction must be valid for the following */
 134 #define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 4)
 135 #define HB_DIRECTION_IS_VERTICAL(dir)   ((((unsigned int) (dir)) & ~1U) == 6)
 136 #define HB_DIRECTION_IS_FORWARD(dir)    ((((unsigned int) (dir)) & ~2U) == 4)
 137 #define HB_DIRECTION_IS_BACKWARD(dir)   ((((unsigned int) (dir)) & ~2U) == 5)
 138 #define HB_DIRECTION_REVERSE(dir)       ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
 139
 140
 141 /* hb_language_t */
 142
 143 typedef const struct hb_language_impl_t *hb_language_t;
 144
 145 HB_EXTERN hb_language_t
 146 hb_language_from_string (const char *str, int len);
 147
 148 HB_EXTERN const char *
 149 hb_language_to_string (hb_language_t language);
 150
 151 #define HB_LANGUAGE_INVALID ((hb_language_t) NULL)
 152
 153 HB_EXTERN hb_language_t
 154 hb_language_get_default (void);
 155
 156
 157 /* hb_script_t */
 158
 159 /* http://unicode.org/iso15924/ */
 160 /* http://goo.gl/x9ilM */
 161 /* Unicode Character Database property: Script (sc) */
 162 typedef enum
 163 {
 164   /*1.1*/ HB_SCRIPT_COMMON                      = HB_TAG ('Z','y','y','y'),
 165   /*1.1*/ HB_SCRIPT_INHERITED                   = HB_TAG ('Z','i','n','h'),
 166   /*5.0*/ HB_SCRIPT_UNKNOWN                     = HB_TAG ('Z','z','z','z'),
 167
 168   /*1.1*/ HB_SCRIPT_ARABIC                      = HB_TAG ('A','r','a','b'),
 169   /*1.1*/ HB_SCRIPT_ARMENIAN                    = HB_TAG ('A','r','m','n'),
 170   /*1.1*/ HB_SCRIPT_BENGALI                     = HB_TAG ('B','e','n','g'),
 171   /*1.1*/ HB_SCRIPT_CYRILLIC                    = HB_TAG ('C','y','r','l'),
 172   /*1.1*/ HB_SCRIPT_DEVANAGARI                  = HB_TAG ('D','e','v','a'),
 173   /*1.1*/ HB_SCRIPT_GEORGIAN                    = HB_TAG ('G','e','o','r'),
 174   /*1.1*/ HB_SCRIPT_GREEK                       = HB_TAG ('G','r','e','k'),
 175   /*1.1*/ HB_SCRIPT_GUJARATI                    = HB_TAG ('G','u','j','r'),
 176   /*1.1*/ HB_SCRIPT_GURMUKHI                    = HB_TAG ('G','u','r','u'),
 177   /*1.1*/ HB_SCRIPT_HANGUL                      = HB_TAG ('H','a','n','g'),
 178   /*1.1*/ HB_SCRIPT_HAN                         = HB_TAG ('H','a','n','i'),
 179   /*1.1*/ HB_SCRIPT_HEBREW                      = HB_TAG ('H','e','b','r'),
 180   /*1.1*/ HB_SCRIPT_HIRAGANA                    = HB_TAG ('H','i','r','a'),
 181   /*1.1*/ HB_SCRIPT_KANNADA                     = HB_TAG ('K','n','d','a'),
 182   /*1.1*/ HB_SCRIPT_KATAKANA                    = HB_TAG ('K','a','n','a'),
 183   /*1.1*/ HB_SCRIPT_LAO                         = HB_TAG ('L','a','o','o'),
 184   /*1.1*/ HB_SCRIPT_LATIN                       = HB_TAG ('L','a','t','n'),
 185   /*1.1*/ HB_SCRIPT_MALAYALAM                   = HB_TAG ('M','l','y','m'),
 186   /*1.1*/ HB_SCRIPT_ORIYA                       = HB_TAG ('O','r','y','a'),
 187   /*1.1*/ HB_SCRIPT_TAMIL                       = HB_TAG ('T','a','m','l'),
 188   /*1.1*/ HB_SCRIPT_TELUGU                      = HB_TAG ('T','e','l','u'),
 189   /*1.1*/ HB_SCRIPT_THAI                        = HB_TAG ('T','h','a','i'),
 190
 191   /*2.0*/ HB_SCRIPT_TIBETAN                     = HB_TAG ('T','i','b','t'),
 192
 193   /*3.0*/ HB_SCRIPT_BOPOMOFO                    = HB_TAG ('B','o','p','o'),
 194   /*3.0*/ HB_SCRIPT_BRAILLE                     = HB_TAG ('B','r','a','i'),
 195   /*3.0*/ HB_SCRIPT_CANADIAN_SYLLABICS          = HB_TAG ('C','a','n','s'),
 196   /*3.0*/ HB_SCRIPT_CHEROKEE                    = HB_TAG ('C','h','e','r'),
 197   /*3.0*/ HB_SCRIPT_ETHIOPIC                    = HB_TAG ('E','t','h','i'),
 198   /*3.0*/ HB_SCRIPT_KHMER                       = HB_TAG ('K','h','m','r'),
 199   /*3.0*/ HB_SCRIPT_MONGOLIAN                   = HB_TAG ('M','o','n','g'),
 200   /*3.0*/ HB_SCRIPT_MYANMAR                     = HB_TAG ('M','y','m','r'),
 201   /*3.0*/ HB_SCRIPT_OGHAM                       = HB_TAG ('O','g','a','m'),
 202   /*3.0*/ HB_SCRIPT_RUNIC                       = HB_TAG ('R','u','n','r'),
 203   /*3.0*/ HB_SCRIPT_SINHALA                     = HB_TAG ('S','i','n','h'),
 204   /*3.0*/ HB_SCRIPT_SYRIAC                      = HB_TAG ('S','y','r','c'),
 205   /*3.0*/ HB_SCRIPT_THAANA                      = HB_TAG ('T','h','a','a'),
 206   /*3.0*/ HB_SCRIPT_YI                          = HB_TAG ('Y','i','i','i'),
 207
 208   /*3.1*/ HB_SCRIPT_DESERET                     = HB_TAG ('D','s','r','t'),
 209   /*3.1*/ HB_SCRIPT_GOTHIC                      = HB_TAG ('G','o','t','h'),
 210   /*3.1*/ HB_SCRIPT_OLD_ITALIC                  = HB_TAG ('I','t','a','l'),
 211
 212   /*3.2*/ HB_SCRIPT_BUHID                       = HB_TAG ('B','u','h','d'),
 213   /*3.2*/ HB_SCRIPT_HANUNOO                     = HB_TAG ('H','a','n','o'),
 214   /*3.2*/ HB_SCRIPT_TAGALOG                     = HB_TAG ('T','g','l','g'),
 215   /*3.2*/ HB_SCRIPT_TAGBANWA                    = HB_TAG ('T','a','g','b'),
 216
 217   /*4.0*/ HB_SCRIPT_CYPRIOT                     = HB_TAG ('C','p','r','t'),
 218   /*4.0*/ HB_SCRIPT_LIMBU                       = HB_TAG ('L','i','m','b'),
 219   /*4.0*/ HB_SCRIPT_LINEAR_B                    = HB_TAG ('L','i','n','b'),
 220   /*4.0*/ HB_SCRIPT_OSMANYA                     = HB_TAG ('O','s','m','a'),
 221   /*4.0*/ HB_SCRIPT_SHAVIAN                     = HB_TAG ('S','h','a','w'),
 222   /*4.0*/ HB_SCRIPT_TAI_LE                      = HB_TAG ('T','a','l','e'),
 223   /*4.0*/ HB_SCRIPT_UGARITIC                    = HB_TAG ('U','g','a','r'),
 224
 225   /*4.1*/ HB_SCRIPT_BUGINESE                    = HB_TAG ('B','u','g','i'),
 226   /*4.1*/ HB_SCRIPT_COPTIC                      = HB_TAG ('C','o','p','t'),
 227   /*4.1*/ HB_SCRIPT_GLAGOLITIC                  = HB_TAG ('G','l','a','g'),
 228   /*4.1*/ HB_SCRIPT_KHAROSHTHI                  = HB_TAG ('K','h','a','r'),
 229   /*4.1*/ HB_SCRIPT_NEW_TAI_LUE                 = HB_TAG ('T','a','l','u'),
 230   /*4.1*/ HB_SCRIPT_OLD_PERSIAN                 = HB_TAG ('X','p','e','o'),
 231   /*4.1*/ HB_SCRIPT_SYLOTI_NAGRI                = HB_TAG ('S','y','l','o'),
 232   /*4.1*/ HB_SCRIPT_TIFINAGH                    = HB_TAG ('T','f','n','g'),
 233
 234   /*5.0*/ HB_SCRIPT_BALINESE                    = HB_TAG ('B','a','l','i'),
 235   /*5.0*/ HB_SCRIPT_CUNEIFORM                   = HB_TAG ('X','s','u','x'),
 236   /*5.0*/ HB_SCRIPT_NKO                         = HB_TAG ('N','k','o','o'),
 237   /*5.0*/ HB_SCRIPT_PHAGS_PA                    = HB_TAG ('P','h','a','g'),
 238   /*5.0*/ HB_SCRIPT_PHOENICIAN                  = HB_TAG ('P','h','n','x'),
 239
 240   /*5.1*/ HB_SCRIPT_CARIAN                      = HB_TAG ('C','a','r','i'),
 241   /*5.1*/ HB_SCRIPT_CHAM                        = HB_TAG ('C','h','a','m'),
 242   /*5.1*/ HB_SCRIPT_KAYAH_LI                    = HB_TAG ('K','a','l','i'),
 243   /*5.1*/ HB_SCRIPT_LEPCHA                      = HB_TAG ('L','e','p','c'),
 244   /*5.1*/ HB_SCRIPT_LYCIAN                      = HB_TAG ('L','y','c','i'),
 245   /*5.1*/ HB_SCRIPT_LYDIAN                      = HB_TAG ('L','y','d','i'),
 246   /*5.1*/ HB_SCRIPT_OL_CHIKI                    = HB_TAG ('O','l','c','k'),
 247   /*5.1*/ HB_SCRIPT_REJANG                      = HB_TAG ('R','j','n','g'),
 248   /*5.1*/ HB_SCRIPT_SAURASHTRA                  = HB_TAG ('S','a','u','r'),
 249   /*5.1*/ HB_SCRIPT_SUNDANESE                   = HB_TAG ('S','u','n','d'),
 250   /*5.1*/ HB_SCRIPT_VAI                         = HB_TAG ('V','a','i','i'),
 251
 252   /*5.2*/ HB_SCRIPT_AVESTAN                     = HB_TAG ('A','v','s','t'),
 253   /*5.2*/ HB_SCRIPT_BAMUM                       = HB_TAG ('B','a','m','u'),
 254   /*5.2*/ HB_SCRIPT_EGYPTIAN_HIEROGLYPHS        = HB_TAG ('E','g','y','p'),
 255   /*5.2*/ HB_SCRIPT_IMPERIAL_ARAMAIC            = HB_TAG ('A','r','m','i'),
 256   /*5.2*/ HB_SCRIPT_INSCRIPTIONAL_PAHLAVI       = HB_TAG ('P','h','l','i'),
 257   /*5.2*/ HB_SCRIPT_INSCRIPTIONAL_PARTHIAN      = HB_TAG ('P','r','t','i'),
 258   /*5.2*/ HB_SCRIPT_JAVANESE                    = HB_TAG ('J','a','v','a'),
 259   /*5.2*/ HB_SCRIPT_KAITHI                      = HB_TAG ('K','t','h','i'),
 260   /*5.2*/ HB_SCRIPT_LISU                        = HB_TAG ('L','i','s','u'),
 261   /*5.2*/ HB_SCRIPT_MEETEI_MAYEK                = HB_TAG ('M','t','e','i'),
 262   /*5.2*/ HB_SCRIPT_OLD_SOUTH_ARABIAN           = HB_TAG ('S','a','r','b'),
 263   /*5.2*/ HB_SCRIPT_OLD_TURKIC                  = HB_TAG ('O','r','k','h'),
 264   /*5.2*/ HB_SCRIPT_SAMARITAN                   = HB_TAG ('S','a','m','r'),
 265   /*5.2*/ HB_SCRIPT_TAI_THAM                    = HB_TAG ('L','a','n','a'),
 266   /*5.2*/ HB_SCRIPT_TAI_VIET                    = HB_TAG ('T','a','v','t'),
 267
 268   /*6.0*/ HB_SCRIPT_BATAK                       = HB_TAG ('B','a','t','k'),
 269   /*6.0*/ HB_SCRIPT_BRAHMI                      = HB_TAG ('B','r','a','h'),
 270   /*6.0*/ HB_SCRIPT_MANDAIC                     = HB_TAG ('M','a','n','d'),
 271
 272   /*6.1*/ HB_SCRIPT_CHAKMA                      = HB_TAG ('C','a','k','m'),
 273   /*6.1*/ HB_SCRIPT_MEROITIC_CURSIVE            = HB_TAG ('M','e','r','c'),
 274   /*6.1*/ HB_SCRIPT_MEROITIC_HIEROGLYPHS        = HB_TAG ('M','e','r','o'),
 275   /*6.1*/ HB_SCRIPT_MIAO                        = HB_TAG ('P','l','r','d'),
 276   /*6.1*/ HB_SCRIPT_SHARADA                     = HB_TAG ('S','h','r','d'),
 277   /*6.1*/ HB_SCRIPT_SORA_SOMPENG                = HB_TAG ('S','o','r','a'),
 278   /*6.1*/ HB_SCRIPT_TAKRI                       = HB_TAG ('T','a','k','r'),
 279
 280   /*
 281    * Since: 0.9.30
 282    */
 283   /*7.0*/ HB_SCRIPT_BASSA_VAH                   = HB_TAG ('B','a','s','s'),
 284   /*7.0*/ HB_SCRIPT_CAUCASIAN_ALBANIAN          = HB_TAG ('A','g','h','b'),
 285   /*7.0*/ HB_SCRIPT_DUPLOYAN                    = HB_TAG ('D','u','p','l'),
 286   /*7.0*/ HB_SCRIPT_ELBASAN                     = HB_TAG ('E','l','b','a'),
 287   /*7.0*/ HB_SCRIPT_GRANTHA                     = HB_TAG ('G','r','a','n'),
 288   /*7.0*/ HB_SCRIPT_KHOJKI                      = HB_TAG ('K','h','o','j'),
 289   /*7.0*/ HB_SCRIPT_KHUDAWADI                   = HB_TAG ('S','i','n','d'),
 290   /*7.0*/ HB_SCRIPT_LINEAR_A                    = HB_TAG ('L','i','n','a'),
 291   /*7.0*/ HB_SCRIPT_MAHAJANI                    = HB_TAG ('M','a','h','j'),
 292   /*7.0*/ HB_SCRIPT_MANICHAEAN                  = HB_TAG ('M','a','n','i'),
 293   /*7.0*/ HB_SCRIPT_MENDE_KIKAKUI               = HB_TAG ('M','e','n','d'),
 294   /*7.0*/ HB_SCRIPT_MODI                        = HB_TAG ('M','o','d','i'),
 295   /*7.0*/ HB_SCRIPT_MRO                         = HB_TAG ('M','r','o','o'),
 296   /*7.0*/ HB_SCRIPT_NABATAEAN                   = HB_TAG ('N','b','a','t'),
 297   /*7.0*/ HB_SCRIPT_OLD_NORTH_ARABIAN           = HB_TAG ('N','a','r','b'),
 298   /*7.0*/ HB_SCRIPT_OLD_PERMIC                  = HB_TAG ('P','e','r','m'),
 299   /*7.0*/ HB_SCRIPT_PAHAWH_HMONG                = HB_TAG ('H','m','n','g'),
 300   /*7.0*/ HB_SCRIPT_PALMYRENE                   = HB_TAG ('P','a','l','m'),
 301   /*7.0*/ HB_SCRIPT_PAU_CIN_HAU                 = HB_TAG ('P','a','u','c'),
 302   /*7.0*/ HB_SCRIPT_PSALTER_PAHLAVI             = HB_TAG ('P','h','l','p'),
 303   /*7.0*/ HB_SCRIPT_SIDDHAM                     = HB_TAG ('S','i','d','d'),
 304   /*7.0*/ HB_SCRIPT_TIRHUTA                     = HB_TAG ('T','i','r','h'),
 305   /*7.0*/ HB_SCRIPT_WARANG_CITI                 = HB_TAG ('W','a','r','a'),
 306
 307   /*8.0*/ HB_SCRIPT_AHOM                        = HB_TAG ('A','h','o','m'),
 308   /*8.0*/ HB_SCRIPT_ANATOLIAN_HIEROGLYPHS       = HB_TAG ('H','l','u','w'),
 309   /*8.0*/ HB_SCRIPT_HATRAN                      = HB_TAG ('H','a','t','r'),
 310   /*8.0*/ HB_SCRIPT_MULTANI                     = HB_TAG ('M','u','l','t'),
 311   /*8.0*/ HB_SCRIPT_OLD_HUNGARIAN               = HB_TAG ('H','u','n','g'),
 312   /*8.0*/ HB_SCRIPT_SIGNWRITING                 = HB_TAG ('S','g','n','w'),
 313
 314   /*
 315    * Since 1.3.0
 316    */
 317   /*9.0*/ HB_SCRIPT_ADLAM                       = HB_TAG ('A','d','l','m'),
 318   /*9.0*/ HB_SCRIPT_BHAIKSUKI                   = HB_TAG ('B','h','k','s'),
 319   /*9.0*/ HB_SCRIPT_MARCHEN                     = HB_TAG ('M','a','r','c'),
 320   /*9.0*/ HB_SCRIPT_OSAGE                       = HB_TAG ('O','s','g','e'),
 321   /*9.0*/ HB_SCRIPT_TANGUT                      = HB_TAG ('T','a','n','g'),
 322   /*9.0*/ HB_SCRIPT_NEWA                        = HB_TAG ('N','e','w','a'),
 323
 324   /* No script set. */
 325   HB_SCRIPT_INVALID                             = HB_TAG_NONE,
 326
 327   /* Dummy values to ensure any hb_tag_t value can be passed/stored as hb_script_t
 328    * without risking undefined behavior.  Include both a signed and unsigned max,
 329    * since technically enums are int, and indeed, hb_script_t ends up being signed.
 330    * See this thread for technicalities:
 331    *
 332    *   http://lists.freedesktop.org/archives/harfbuzz/2014-March/004150.html
 333    */
 334   _HB_SCRIPT_MAX_VALUE                          = HB_TAG_MAX, /*< skip >*/
 335   _HB_SCRIPT_MAX_VALUE_SIGNED                   = HB_TAG_MAX_SIGNED /*< skip >*/
 336
 337 } hb_script_t;
 338
 339
 340 /* Script functions */
 341
 342 HB_EXTERN hb_script_t
 343 hb_script_from_iso15924_tag (hb_tag_t tag);
 344
 345 HB_EXTERN hb_script_t
 346 hb_script_from_string (const char *str, int len);
 347
 348 HB_EXTERN hb_tag_t
 349 hb_script_to_iso15924_tag (hb_script_t script);
 350
 351 HB_EXTERN hb_direction_t
 352 hb_script_get_horizontal_direction (hb_script_t script);
 353
 354
 355 /* User data */
 356
 357 typedef struct hb_user_data_key_t {
 358   /*< private >*/
 359   char unused;
 360 } hb_user_data_key_t;
 361
 362 typedef void (*hb_destroy_func_t) (void *user_data);
 363
 364
 365 /* Font features and variations. */
 366
 367 typedef struct hb_feature_t {
 368   hb_tag_t      tag;
 369   uint32_t      value;
 370   unsigned int  start;
 371   unsigned int  end;
 372 } hb_feature_t;
 373
 374 HB_EXTERN hb_bool_t
 375 hb_feature_from_string (const char *str, int len,
 376                         hb_feature_t *feature);
 377
 378 HB_EXTERN void
 379 hb_feature_to_string (hb_feature_t *feature,
 380                       char *buf, unsigned int size);
 381
 382 /**
 383  * hb_variation_t:
 384  *
 385  * Since: 1.4.2
 386  */
 387 typedef struct hb_variation_t {
 388   hb_tag_t tag;
 389   float    value;
 390 } hb_variation_t;
 391
 392 HB_EXTERN hb_bool_t
 393 hb_variation_from_string (const char *str, int len,
 394                           hb_variation_t *variation);
 395
 396 HB_EXTERN void
 397 hb_variation_to_string (hb_variation_t *variation,
 398                         char *buf, unsigned int size);
 399
 400
 401 HB_END_DECLS
 402
 403 #endif /* HB_COMMON_H */