hb-common.h

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/*
 * Copyright © 2007,2008,2009  Red Hat, Inc.
 * Copyright © 2011,2012  Google, Inc.
 *
 *  This is part of HarfBuzz, a text shaping library.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 *
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Red Hat Author(s): Behdad Esfahbod
 * Google Author(s): Behdad Esfahbod
 */
 
#if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
#error "Include <hb.h> instead."
#endif
 
#ifndef HB_COMMON_H
#define HB_COMMON_H
 
#ifndef HB_EXTERN
#define HB_EXTERN extern
#endif
 
#ifndef HB_BEGIN_DECLS
# ifdef __cplusplus
#  define HB_BEGIN_DECLS    extern "C" {
#  define HB_END_DECLS      }
# else /* !__cplusplus */
#  define HB_BEGIN_DECLS
#  define HB_END_DECLS
# endif /* !__cplusplus */
#endif
 
#if defined (_SVR4) || defined (SVR4) || defined (__OpenBSD__) || \
    defined (_sgi) || defined (__sun) || defined (sun) || \
    defined (__digital__) || defined (__HP_cc)
#  include <inttypes.h>
#elif defined (_AIX)
#  include <sys/inttypes.h>
#elif defined (_MSC_VER) && _MSC_VER < 1600
/* VS 2010 (_MSC_VER 1600) has stdint.h */
typedef __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#elif defined (__KERNEL__)
#  include <linux/types.h>
#else
#  include <stdint.h>
#endif
 
#if defined(__GNUC__) && ((__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
#define HB_DEPRECATED __attribute__((__deprecated__))
#elif defined(_MSC_VER) && (_MSC_VER >= 1300)
#define HB_DEPRECATED __declspec(deprecated)
#else
#define HB_DEPRECATED
#endif
 
#if defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
#define HB_DEPRECATED_FOR(f) __attribute__((__deprecated__("Use '" #f "' instead")))
#elif defined(_MSC_FULL_VER) && (_MSC_FULL_VER > 140050320)
#define HB_DEPRECATED_FOR(f) __declspec(deprecated("is deprecated. Use '" #f "' instead"))
#else
#define HB_DEPRECATED_FOR(f) HB_DEPRECATED
#endif
 
 
HB_BEGIN_DECLS
 
typedef int hb_bool_t;
 
typedef uint32_t hb_codepoint_t;
typedef int32_t hb_position_t;
typedef uint32_t hb_mask_t;
 
typedef union _hb_var_int_t {
  uint32_t u32;
  int32_t i32;
  uint16_t u16[2];
  int16_t i16[2];
  uint8_t u8[4];
  int8_t i8[4];
} hb_var_int_t;
 
typedef union _hb_var_num_t {
  float f;
  uint32_t u32;
  int32_t i32;
  uint16_t u16[2];
  int16_t i16[2];
  uint8_t u8[4];
  int8_t i8[4];
} hb_var_num_t;
 
 
/* hb_tag_t */
 
typedef uint32_t hb_tag_t;
 
#define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint32_t)(c1)&0xFF)<<24)|(((uint32_t)(c2)&0xFF)<<16)|(((uint32_t)(c3)&0xFF)<<8)|((uint32_t)(c4)&0xFF)))
 
#define HB_UNTAG(tag)   (uint8_t)(((tag)>>24)&0xFF), (uint8_t)(((tag)>>16)&0xFF), (uint8_t)(((tag)>>8)&0xFF), (uint8_t)((tag)&0xFF)
 
#define HB_TAG_NONE HB_TAG(0,0,0,0)
#define HB_TAG_MAX HB_TAG(0xff,0xff,0xff,0xff)
#define HB_TAG_MAX_SIGNED HB_TAG(0x7f,0xff,0xff,0xff)
 
/* len=-1 means str is NUL-terminated. */
HB_EXTERN hb_tag_t
hb_tag_from_string (const char *str, int len);
 
/* buf should have 4 bytes. */
HB_EXTERN void
hb_tag_to_string (hb_tag_t tag, char *buf);
 
 
typedef enum {
  HB_DIRECTION_INVALID = 0,
  HB_DIRECTION_LTR = 4,
  HB_DIRECTION_RTL,
  HB_DIRECTION_TTB,
  HB_DIRECTION_BTT
} hb_direction_t;
 
/* len=-1 means str is NUL-terminated */
HB_EXTERN hb_direction_t
hb_direction_from_string (const char *str, int len);
 
HB_EXTERN const char *
hb_direction_to_string (hb_direction_t direction);
 
#define HB_DIRECTION_IS_VALID(dir)  ((((unsigned int) (dir)) & ~3U) == 4)
/* Direction must be valid for the following */
#define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 4)
#define HB_DIRECTION_IS_VERTICAL(dir)   ((((unsigned int) (dir)) & ~1U) == 6)
#define HB_DIRECTION_IS_FORWARD(dir)    ((((unsigned int) (dir)) & ~2U) == 4)
#define HB_DIRECTION_IS_BACKWARD(dir)   ((((unsigned int) (dir)) & ~2U) == 5)
#define HB_DIRECTION_REVERSE(dir)   ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
 
 
/* hb_language_t */
 
typedef const struct hb_language_impl_t *hb_language_t;
 
HB_EXTERN hb_language_t
hb_language_from_string (const char *str, int len);
 
HB_EXTERN const char *
hb_language_to_string (hb_language_t language);
 
#define HB_LANGUAGE_INVALID ((hb_language_t) 0)
 
HB_EXTERN hb_language_t
hb_language_get_default (void);
 
 
/* https://docs.google.com/spreadsheets/d/1Y90M0Ie3MUJ6UVCRDOypOtijlMDLNNyyLk36T6iMu0o */
typedef enum
{
  HB_SCRIPT_COMMON          = HB_TAG ('Z','y','y','y'), /*1.1*/
  HB_SCRIPT_INHERITED           = HB_TAG ('Z','i','n','h'), /*1.1*/
  HB_SCRIPT_UNKNOWN         = HB_TAG ('Z','z','z','z'), /*5.0*/
 
  HB_SCRIPT_ARABIC          = HB_TAG ('A','r','a','b'), /*1.1*/
  HB_SCRIPT_ARMENIAN            = HB_TAG ('A','r','m','n'), /*1.1*/
  HB_SCRIPT_BENGALI         = HB_TAG ('B','e','n','g'), /*1.1*/
  HB_SCRIPT_CYRILLIC            = HB_TAG ('C','y','r','l'), /*1.1*/
  HB_SCRIPT_DEVANAGARI          = HB_TAG ('D','e','v','a'), /*1.1*/
  HB_SCRIPT_GEORGIAN            = HB_TAG ('G','e','o','r'), /*1.1*/
  HB_SCRIPT_GREEK           = HB_TAG ('G','r','e','k'), /*1.1*/
  HB_SCRIPT_GUJARATI            = HB_TAG ('G','u','j','r'), /*1.1*/
  HB_SCRIPT_GURMUKHI            = HB_TAG ('G','u','r','u'), /*1.1*/
  HB_SCRIPT_HANGUL          = HB_TAG ('H','a','n','g'), /*1.1*/
  HB_SCRIPT_HAN             = HB_TAG ('H','a','n','i'), /*1.1*/
  HB_SCRIPT_HEBREW          = HB_TAG ('H','e','b','r'), /*1.1*/
  HB_SCRIPT_HIRAGANA            = HB_TAG ('H','i','r','a'), /*1.1*/
  HB_SCRIPT_KANNADA         = HB_TAG ('K','n','d','a'), /*1.1*/
  HB_SCRIPT_KATAKANA            = HB_TAG ('K','a','n','a'), /*1.1*/
  HB_SCRIPT_LAO             = HB_TAG ('L','a','o','o'), /*1.1*/
  HB_SCRIPT_LATIN           = HB_TAG ('L','a','t','n'), /*1.1*/
  HB_SCRIPT_MALAYALAM           = HB_TAG ('M','l','y','m'), /*1.1*/
  HB_SCRIPT_ORIYA           = HB_TAG ('O','r','y','a'), /*1.1*/
  HB_SCRIPT_TAMIL           = HB_TAG ('T','a','m','l'), /*1.1*/
  HB_SCRIPT_TELUGU          = HB_TAG ('T','e','l','u'), /*1.1*/
  HB_SCRIPT_THAI            = HB_TAG ('T','h','a','i'), /*1.1*/
 
  HB_SCRIPT_TIBETAN         = HB_TAG ('T','i','b','t'), /*2.0*/
 
  HB_SCRIPT_BOPOMOFO            = HB_TAG ('B','o','p','o'), /*3.0*/
  HB_SCRIPT_BRAILLE         = HB_TAG ('B','r','a','i'), /*3.0*/
  HB_SCRIPT_CANADIAN_SYLLABICS      = HB_TAG ('C','a','n','s'), /*3.0*/
  HB_SCRIPT_CHEROKEE            = HB_TAG ('C','h','e','r'), /*3.0*/
  HB_SCRIPT_ETHIOPIC            = HB_TAG ('E','t','h','i'), /*3.0*/
  HB_SCRIPT_KHMER           = HB_TAG ('K','h','m','r'), /*3.0*/
  HB_SCRIPT_MONGOLIAN           = HB_TAG ('M','o','n','g'), /*3.0*/
  HB_SCRIPT_MYANMAR         = HB_TAG ('M','y','m','r'), /*3.0*/
  HB_SCRIPT_OGHAM           = HB_TAG ('O','g','a','m'), /*3.0*/
  HB_SCRIPT_RUNIC           = HB_TAG ('R','u','n','r'), /*3.0*/
  HB_SCRIPT_SINHALA         = HB_TAG ('S','i','n','h'), /*3.0*/
  HB_SCRIPT_SYRIAC          = HB_TAG ('S','y','r','c'), /*3.0*/
  HB_SCRIPT_THAANA          = HB_TAG ('T','h','a','a'), /*3.0*/
  HB_SCRIPT_YI              = HB_TAG ('Y','i','i','i'), /*3.0*/
 
  HB_SCRIPT_DESERET         = HB_TAG ('D','s','r','t'), /*3.1*/
  HB_SCRIPT_GOTHIC          = HB_TAG ('G','o','t','h'), /*3.1*/
  HB_SCRIPT_OLD_ITALIC          = HB_TAG ('I','t','a','l'), /*3.1*/
 
  HB_SCRIPT_BUHID           = HB_TAG ('B','u','h','d'), /*3.2*/
  HB_SCRIPT_HANUNOO         = HB_TAG ('H','a','n','o'), /*3.2*/
  HB_SCRIPT_TAGALOG         = HB_TAG ('T','g','l','g'), /*3.2*/
  HB_SCRIPT_TAGBANWA            = HB_TAG ('T','a','g','b'), /*3.2*/
 
  HB_SCRIPT_CYPRIOT         = HB_TAG ('C','p','r','t'), /*4.0*/
  HB_SCRIPT_LIMBU           = HB_TAG ('L','i','m','b'), /*4.0*/
  HB_SCRIPT_LINEAR_B            = HB_TAG ('L','i','n','b'), /*4.0*/
  HB_SCRIPT_OSMANYA         = HB_TAG ('O','s','m','a'), /*4.0*/
  HB_SCRIPT_SHAVIAN         = HB_TAG ('S','h','a','w'), /*4.0*/
  HB_SCRIPT_TAI_LE          = HB_TAG ('T','a','l','e'), /*4.0*/
  HB_SCRIPT_UGARITIC            = HB_TAG ('U','g','a','r'), /*4.0*/
 
  HB_SCRIPT_BUGINESE            = HB_TAG ('B','u','g','i'), /*4.1*/
  HB_SCRIPT_COPTIC          = HB_TAG ('C','o','p','t'), /*4.1*/
  HB_SCRIPT_GLAGOLITIC          = HB_TAG ('G','l','a','g'), /*4.1*/
  HB_SCRIPT_KHAROSHTHI          = HB_TAG ('K','h','a','r'), /*4.1*/
  HB_SCRIPT_NEW_TAI_LUE         = HB_TAG ('T','a','l','u'), /*4.1*/
  HB_SCRIPT_OLD_PERSIAN         = HB_TAG ('X','p','e','o'), /*4.1*/
  HB_SCRIPT_SYLOTI_NAGRI        = HB_TAG ('S','y','l','o'), /*4.1*/
  HB_SCRIPT_TIFINAGH            = HB_TAG ('T','f','n','g'), /*4.1*/
 
  HB_SCRIPT_BALINESE            = HB_TAG ('B','a','l','i'), /*5.0*/
  HB_SCRIPT_CUNEIFORM           = HB_TAG ('X','s','u','x'), /*5.0*/
  HB_SCRIPT_NKO             = HB_TAG ('N','k','o','o'), /*5.0*/
  HB_SCRIPT_PHAGS_PA            = HB_TAG ('P','h','a','g'), /*5.0*/
  HB_SCRIPT_PHOENICIAN          = HB_TAG ('P','h','n','x'), /*5.0*/
 
  HB_SCRIPT_CARIAN          = HB_TAG ('C','a','r','i'), /*5.1*/
  HB_SCRIPT_CHAM            = HB_TAG ('C','h','a','m'), /*5.1*/
  HB_SCRIPT_KAYAH_LI            = HB_TAG ('K','a','l','i'), /*5.1*/
  HB_SCRIPT_LEPCHA          = HB_TAG ('L','e','p','c'), /*5.1*/
  HB_SCRIPT_LYCIAN          = HB_TAG ('L','y','c','i'), /*5.1*/
  HB_SCRIPT_LYDIAN          = HB_TAG ('L','y','d','i'), /*5.1*/
  HB_SCRIPT_OL_CHIKI            = HB_TAG ('O','l','c','k'), /*5.1*/
  HB_SCRIPT_REJANG          = HB_TAG ('R','j','n','g'), /*5.1*/
  HB_SCRIPT_SAURASHTRA          = HB_TAG ('S','a','u','r'), /*5.1*/
  HB_SCRIPT_SUNDANESE           = HB_TAG ('S','u','n','d'), /*5.1*/
  HB_SCRIPT_VAI             = HB_TAG ('V','a','i','i'), /*5.1*/
 
  HB_SCRIPT_AVESTAN         = HB_TAG ('A','v','s','t'), /*5.2*/
  HB_SCRIPT_BAMUM           = HB_TAG ('B','a','m','u'), /*5.2*/
  HB_SCRIPT_EGYPTIAN_HIEROGLYPHS    = HB_TAG ('E','g','y','p'), /*5.2*/
  HB_SCRIPT_IMPERIAL_ARAMAIC        = HB_TAG ('A','r','m','i'), /*5.2*/
  HB_SCRIPT_INSCRIPTIONAL_PAHLAVI   = HB_TAG ('P','h','l','i'), /*5.2*/
  HB_SCRIPT_INSCRIPTIONAL_PARTHIAN  = HB_TAG ('P','r','t','i'), /*5.2*/
  HB_SCRIPT_JAVANESE            = HB_TAG ('J','a','v','a'), /*5.2*/
  HB_SCRIPT_KAITHI          = HB_TAG ('K','t','h','i'), /*5.2*/
  HB_SCRIPT_LISU            = HB_TAG ('L','i','s','u'), /*5.2*/
  HB_SCRIPT_MEETEI_MAYEK        = HB_TAG ('M','t','e','i'), /*5.2*/
  HB_SCRIPT_OLD_SOUTH_ARABIAN       = HB_TAG ('S','a','r','b'), /*5.2*/
  HB_SCRIPT_OLD_TURKIC          = HB_TAG ('O','r','k','h'), /*5.2*/
  HB_SCRIPT_SAMARITAN           = HB_TAG ('S','a','m','r'), /*5.2*/
  HB_SCRIPT_TAI_THAM            = HB_TAG ('L','a','n','a'), /*5.2*/
  HB_SCRIPT_TAI_VIET            = HB_TAG ('T','a','v','t'), /*5.2*/
 
  HB_SCRIPT_BATAK           = HB_TAG ('B','a','t','k'), /*6.0*/
  HB_SCRIPT_BRAHMI          = HB_TAG ('B','r','a','h'), /*6.0*/
  HB_SCRIPT_MANDAIC         = HB_TAG ('M','a','n','d'), /*6.0*/
 
  HB_SCRIPT_CHAKMA          = HB_TAG ('C','a','k','m'), /*6.1*/
  HB_SCRIPT_MEROITIC_CURSIVE        = HB_TAG ('M','e','r','c'), /*6.1*/
  HB_SCRIPT_MEROITIC_HIEROGLYPHS    = HB_TAG ('M','e','r','o'), /*6.1*/
  HB_SCRIPT_MIAO            = HB_TAG ('P','l','r','d'), /*6.1*/
  HB_SCRIPT_SHARADA         = HB_TAG ('S','h','r','d'), /*6.1*/
  HB_SCRIPT_SORA_SOMPENG        = HB_TAG ('S','o','r','a'), /*6.1*/
  HB_SCRIPT_TAKRI           = HB_TAG ('T','a','k','r'), /*6.1*/
 
  /*
   * Since: 0.9.30
   */
  HB_SCRIPT_BASSA_VAH           = HB_TAG ('B','a','s','s'), /*7.0*/
  HB_SCRIPT_CAUCASIAN_ALBANIAN      = HB_TAG ('A','g','h','b'), /*7.0*/
  HB_SCRIPT_DUPLOYAN            = HB_TAG ('D','u','p','l'), /*7.0*/
  HB_SCRIPT_ELBASAN         = HB_TAG ('E','l','b','a'), /*7.0*/
  HB_SCRIPT_GRANTHA         = HB_TAG ('G','r','a','n'), /*7.0*/
  HB_SCRIPT_KHOJKI          = HB_TAG ('K','h','o','j'), /*7.0*/
  HB_SCRIPT_KHUDAWADI           = HB_TAG ('S','i','n','d'), /*7.0*/
  HB_SCRIPT_LINEAR_A            = HB_TAG ('L','i','n','a'), /*7.0*/
  HB_SCRIPT_MAHAJANI            = HB_TAG ('M','a','h','j'), /*7.0*/
  HB_SCRIPT_MANICHAEAN          = HB_TAG ('M','a','n','i'), /*7.0*/
  HB_SCRIPT_MENDE_KIKAKUI       = HB_TAG ('M','e','n','d'), /*7.0*/
  HB_SCRIPT_MODI            = HB_TAG ('M','o','d','i'), /*7.0*/
  HB_SCRIPT_MRO             = HB_TAG ('M','r','o','o'), /*7.0*/
  HB_SCRIPT_NABATAEAN           = HB_TAG ('N','b','a','t'), /*7.0*/
  HB_SCRIPT_OLD_NORTH_ARABIAN       = HB_TAG ('N','a','r','b'), /*7.0*/
  HB_SCRIPT_OLD_PERMIC          = HB_TAG ('P','e','r','m'), /*7.0*/
  HB_SCRIPT_PAHAWH_HMONG        = HB_TAG ('H','m','n','g'), /*7.0*/
  HB_SCRIPT_PALMYRENE           = HB_TAG ('P','a','l','m'), /*7.0*/
  HB_SCRIPT_PAU_CIN_HAU         = HB_TAG ('P','a','u','c'), /*7.0*/
  HB_SCRIPT_PSALTER_PAHLAVI     = HB_TAG ('P','h','l','p'), /*7.0*/
  HB_SCRIPT_SIDDHAM         = HB_TAG ('S','i','d','d'), /*7.0*/
  HB_SCRIPT_TIRHUTA         = HB_TAG ('T','i','r','h'), /*7.0*/
  HB_SCRIPT_WARANG_CITI         = HB_TAG ('W','a','r','a'), /*7.0*/
 
  HB_SCRIPT_AHOM            = HB_TAG ('A','h','o','m'), /*8.0*/
  HB_SCRIPT_ANATOLIAN_HIEROGLYPHS   = HB_TAG ('H','l','u','w'), /*8.0*/
  HB_SCRIPT_HATRAN          = HB_TAG ('H','a','t','r'), /*8.0*/
  HB_SCRIPT_MULTANI         = HB_TAG ('M','u','l','t'), /*8.0*/
  HB_SCRIPT_OLD_HUNGARIAN       = HB_TAG ('H','u','n','g'), /*8.0*/
  HB_SCRIPT_SIGNWRITING         = HB_TAG ('S','g','n','w'), /*8.0*/
 
  /*
   * Since 1.3.0
   */
  HB_SCRIPT_ADLAM           = HB_TAG ('A','d','l','m'), /*9.0*/
  HB_SCRIPT_BHAIKSUKI           = HB_TAG ('B','h','k','s'), /*9.0*/
  HB_SCRIPT_MARCHEN         = HB_TAG ('M','a','r','c'), /*9.0*/
  HB_SCRIPT_OSAGE           = HB_TAG ('O','s','g','e'), /*9.0*/
  HB_SCRIPT_TANGUT          = HB_TAG ('T','a','n','g'), /*9.0*/
  HB_SCRIPT_NEWA            = HB_TAG ('N','e','w','a'), /*9.0*/
 
  /*
   * Since 1.6.0
   */
  HB_SCRIPT_MASARAM_GONDI       = HB_TAG ('G','o','n','m'), /*10.0*/
  HB_SCRIPT_NUSHU           = HB_TAG ('N','s','h','u'), /*10.0*/
  HB_SCRIPT_SOYOMBO         = HB_TAG ('S','o','y','o'), /*10.0*/
  HB_SCRIPT_ZANABAZAR_SQUARE        = HB_TAG ('Z','a','n','b'), /*10.0*/
 
  /*
   * Since 1.8.0
   */
  HB_SCRIPT_DOGRA           = HB_TAG ('D','o','g','r'), /*11.0*/
  HB_SCRIPT_GUNJALA_GONDI       = HB_TAG ('G','o','n','g'), /*11.0*/
  HB_SCRIPT_HANIFI_ROHINGYA     = HB_TAG ('R','o','h','g'), /*11.0*/
  HB_SCRIPT_MAKASAR         = HB_TAG ('M','a','k','a'), /*11.0*/
  HB_SCRIPT_MEDEFAIDRIN         = HB_TAG ('M','e','d','f'), /*11.0*/
  HB_SCRIPT_OLD_SOGDIAN         = HB_TAG ('S','o','g','o'), /*11.0*/
  HB_SCRIPT_SOGDIAN         = HB_TAG ('S','o','g','d'), /*11.0*/
 
  /*
   * Since 2.4.0
   */
  HB_SCRIPT_ELYMAIC         = HB_TAG ('E','l','y','m'), /*12.0*/
  HB_SCRIPT_NANDINAGARI         = HB_TAG ('N','a','n','d'), /*12.0*/
  HB_SCRIPT_NYIAKENG_PUACHUE_HMONG  = HB_TAG ('H','m','n','p'), /*12.0*/
  HB_SCRIPT_WANCHO          = HB_TAG ('W','c','h','o'), /*12.0*/
 
  /*
   * Since 2.6.7
   */
  HB_SCRIPT_CHORASMIAN          = HB_TAG ('C','h','r','s'), /*13.0*/
  HB_SCRIPT_DIVES_AKURU         = HB_TAG ('D','i','a','k'), /*13.0*/
  HB_SCRIPT_KHITAN_SMALL_SCRIPT     = HB_TAG ('K','i','t','s'), /*13.0*/
  HB_SCRIPT_YEZIDI          = HB_TAG ('Y','e','z','i'), /*13.0*/
 
  /*
   * Since 3.0.0
   */
  HB_SCRIPT_CYPRO_MINOAN        = HB_TAG ('C','p','m','n'), /*14.0*/
  HB_SCRIPT_OLD_UYGHUR          = HB_TAG ('O','u','g','r'), /*14.0*/
  HB_SCRIPT_TANGSA          = HB_TAG ('T','n','s','a'), /*14.0*/
  HB_SCRIPT_TOTO            = HB_TAG ('T','o','t','o'), /*14.0*/
  HB_SCRIPT_VITHKUQI            = HB_TAG ('V','i','t','h'), /*14.0*/
 
  /*
   * Since 3.4.0
   */
  HB_SCRIPT_MATH            = HB_TAG ('Z','m','t','h'),
 
  /* No script set. */
  HB_SCRIPT_INVALID         = HB_TAG_NONE,
 
  /*< private >*/
 
  /* Dummy values to ensure any hb_tag_t value can be passed/stored as hb_script_t
   * without risking undefined behavior.  We have two, for historical reasons.
   * HB_TAG_MAX used to be unsigned, but that was invalid Ansi C, so was changed
   * to _HB_SCRIPT_MAX_VALUE to be equal to HB_TAG_MAX_SIGNED as well.
   *
   * See this thread for technicalities:
   *
   *   https://lists.freedesktop.org/archives/harfbuzz/2014-March/004150.html
   */
  _HB_SCRIPT_MAX_VALUE              = HB_TAG_MAX_SIGNED, /*< skip >*/
  _HB_SCRIPT_MAX_VALUE_SIGNED           = HB_TAG_MAX_SIGNED /*< skip >*/
 
} hb_script_t;
 
 
/* Script functions */
 
HB_EXTERN hb_script_t
hb_script_from_iso15924_tag (hb_tag_t tag);
 
HB_EXTERN hb_script_t
hb_script_from_string (const char *str, int len);
 
HB_EXTERN hb_tag_t
hb_script_to_iso15924_tag (hb_script_t script);
 
HB_EXTERN hb_direction_t
hb_script_get_horizontal_direction (hb_script_t script);
 
 
/* User data */
 
typedef struct hb_user_data_key_t {
  /*< private >*/
  char unused;
} hb_user_data_key_t;
 
typedef void (*hb_destroy_func_t) (void *user_data);
 
 
/* Font features and variations. */
 
#define HB_FEATURE_GLOBAL_START 0
 
#define HB_FEATURE_GLOBAL_END   ((unsigned int) -1)
 
typedef struct hb_feature_t {
  hb_tag_t      tag;
  uint32_t      value;
  unsigned int  start;
  unsigned int  end;
} hb_feature_t;
 
HB_EXTERN hb_bool_t
hb_feature_from_string (const char *str, int len,
            hb_feature_t *feature);
 
HB_EXTERN void
hb_feature_to_string (hb_feature_t *feature,
              char *buf, unsigned int size);
 
typedef struct hb_variation_t {
  hb_tag_t tag;
  float    value;
} hb_variation_t;
 
HB_EXTERN hb_bool_t
hb_variation_from_string (const char *str, int len,
              hb_variation_t *variation);
 
HB_EXTERN void
hb_variation_to_string (hb_variation_t *variation,
            char *buf, unsigned int size);
 
typedef uint32_t hb_color_t;
 
#define HB_COLOR(b,g,r,a) ((hb_color_t) HB_TAG ((b),(g),(r),(a)))
 
HB_EXTERN uint8_t
hb_color_get_alpha (hb_color_t color);
#define hb_color_get_alpha(color)   ((color) & 0xFF)
 
HB_EXTERN uint8_t
hb_color_get_red (hb_color_t color);
#define hb_color_get_red(color)     (((color) >> 8) & 0xFF)
 
HB_EXTERN uint8_t
hb_color_get_green (hb_color_t color);
#define hb_color_get_green(color)   (((color) >> 16) & 0xFF)
 
HB_EXTERN uint8_t
hb_color_get_blue (hb_color_t color);
#define hb_color_get_blue(color)    (((color) >> 24) & 0xFF)
 
HB_END_DECLS
 
#endif /* HB_COMMON_H */