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      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 */
    404