Quelle hb-common.h
Sprache: C
/*
* 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 (_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 (_MSC_VER) && _MSC_VER < 1800
/* VS 2013 (_MSC_VER 1800) has inttypes.h */
# include <stdint.h>
#else
# include <inttypes.h>
#endif
#include <stddef.h>
#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
/**
* hb_bool_t :
*
* Data type for booleans .
*
**/
typedef int hb_bool_t;
/**
* hb_codepoint_t :
*
* Data type for holding Unicode codepoints . Also
* used to hold glyph IDs .
*
**/
typedef uint32_t hb_codepoint_t;
/**
* HB_CODEPOINT_INVALID :
*
* Unused # hb_codepoint_t value .
*
* Since : 8 . 0 . 0
*/
#define HB_CODEPOINT_INVALID ((hb_codepoint_t) -1 )
/**
* hb_position_t :
*
* Data type for holding a single coordinate value .
* Contour points and other multi - dimensional data are
* stored as tuples of # hb_position_t ' s .
*
**/
typedef int32_t hb_position_t;
/**
* hb_mask_t :
*
* Data type for bitmasks .
*
**/
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 */
/**
* hb_tag_t :
*
* Data type for tag identifiers . Tags are four
* byte integers , each byte representing a character .
*
* Tags are used to identify tables , design - variation axes ,
* scripts , languages , font features , and baselines with
* human - readable names .
*
**/
typedef uint32_t hb_tag_t;
/**
* HB_TAG :
* @ c1 : 1 st character of the tag
* @ c2 : 2 nd character of the tag
* @ c3 : 3 rd character of the tag
* @ c4 : 4 th character of the tag
*
* Constructs an # hb_tag_t from four character literals .
*
**/
#define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint32_t)(c1)&0 xFF)<<24 )|(((uint32_t)(c2)&0 xFF)<<16 )|(((uint32_t)(c3)&style='color: green'>0 xFF)<<8 )|((uint32_t)(c4)&0 xFF)))
/**
* HB_UNTAG :
* @ tag : an # hb_tag_t
*
* Extracts four character literals from an # hb_tag_t .
*
* Since : 0 . 6 . 0
*
**/
#define HB_UNTAG(tag) (uint8_t)(((tag)>>24 )&0 xFF), (uint8_t)(((tag)>>16 )&0 xFF), (uint8_t)(((tag)>>8 )&0 xFF), (uint8_t)((tag)&0 xFF)
/**
* HB_TAG_NONE :
*
* Unset # hb_tag_t .
*/
#define HB_TAG_NONE HB_TAG(0 ,0 ,0 ,0 )
/**
* HB_TAG_MAX :
*
* Maximum possible unsigned # hb_tag_t .
*
* Since : 0 . 9 . 26
*/
#define HB_TAG_MAX HB_TAG(0 xff,0 xff,0 xff,0 xff)
/**
* HB_TAG_MAX_SIGNED :
*
* Maximum possible signed # hb_tag_t .
*
* Since : 0 . 9 . 33
*/
#define HB_TAG_MAX_SIGNED HB_TAG(0 x7f,0 xff,0 xff,0 xff)
/* 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);
/**
* hb_direction_t :
* @ HB_DIRECTION_INVALID : Initial , unset direction .
* @ HB_DIRECTION_LTR : Text is set horizontally from left to right .
* @ HB_DIRECTION_RTL : Text is set horizontally from right to left .
* @ HB_DIRECTION_TTB : Text is set vertically from top to bottom .
* @ HB_DIRECTION_BTT : Text is set vertically from bottom to top .
*
* The direction of a text segment or buffer .
*
* A segment can also be tested for horizontal or vertical
* orientation ( irrespective of specific direction ) with
* HB_DIRECTION_IS_HORIZONTAL ( ) or HB_DIRECTION_IS_VERTICAL ( ) .
*
*/
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);
/**
* HB_DIRECTION_IS_VALID :
* @ dir : # hb_direction_t to test
*
* Tests whether a text direction is valid .
*
**/
#define HB_DIRECTION_IS_VALID(dir) ((((unsigned int ) (dir)) & ~3 U) == 4 )
/* Direction must be valid for the following */
/**
* HB_DIRECTION_IS_HORIZONTAL :
* @ dir : # hb_direction_t to test
*
* Tests whether a text direction is horizontal . Requires
* that the direction be valid .
*
**/
#define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int ) (dir)) & ~1 U) == 4 )
/**
* HB_DIRECTION_IS_VERTICAL :
* @ dir : # hb_direction_t to test
*
* Tests whether a text direction is vertical . Requires
* that the direction be valid .
*
**/
#define HB_DIRECTION_IS_VERTICAL(dir) ((((unsigned int ) (dir)) & ~1 U) == 6 )
/**
* HB_DIRECTION_IS_FORWARD :
* @ dir : # hb_direction_t to test
*
* Tests whether a text direction moves forward ( from left to right , or from
* top to bottom ) . Requires that the direction be valid .
*
**/
#define HB_DIRECTION_IS_FORWARD(dir) ((((unsigned int ) (dir)) & ~2 U) == 4 )
/**
* HB_DIRECTION_IS_BACKWARD :
* @ dir : # hb_direction_t to test
*
* Tests whether a text direction moves backward ( from right to left , or from
* bottom to top ) . Requires that the direction be valid .
*
**/
#define HB_DIRECTION_IS_BACKWARD(dir) ((((unsigned int ) (dir)) & ~2 U) == 5 )
/**
* HB_DIRECTION_REVERSE :
* @ dir : # hb_direction_t to reverse
*
* Reverses a text direction . Requires that the direction
* be valid .
*
**/
#define HB_DIRECTION_REVERSE(dir) ((hb_direction_t) (((unsigned int ) (dir)) ^ 1 ))
/* hb_language_t */
/**
* hb_language_t :
*
* Data type for languages . Each # hb_language_t corresponds to a BCP 47
* language tag .
*
*/
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);
/**
* HB_LANGUAGE_INVALID :
*
* An unset # hb_language_t .
*
* Since : 0 . 6 . 0
*/
#define HB_LANGUAGE_INVALID ((hb_language_t) 0 )
HB_EXTERN hb_language_t
hb_language_get_default (void );
HB_EXTERN hb_bool_t
hb_language_matches (hb_language_t language,
hb_language_t specific);
#include "hb-script-list.h"
/* 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 */
/**
* hb_user_data_key_t :
*
* Data structure for holding user - data keys .
*
**/
typedef struct hb_user_data_key_t {
/*< private >*/
char unused;
} hb_user_data_key_t;
/**
* hb_destroy_func_t :
* @ user_data : the data to be destroyed
*
* A virtual method for destroy user - data callbacks .
*
*/
typedef void (*hb_destroy_func_t) (void *user_data);
/* Font features and variations. */
/**
* HB_FEATURE_GLOBAL_START :
*
* Special setting for # hb_feature_t . start to apply the feature from the start
* of the buffer .
*
* Since : 2 . 0 . 0
*/
#define HB_FEATURE_GLOBAL_START 0
/**
* HB_FEATURE_GLOBAL_END :
*
* Special setting for # hb_feature_t . end to apply the feature from to the end
* of the buffer .
*
* Since : 2 . 0 . 0
*/
#define HB_FEATURE_GLOBAL_END ((unsigned int ) -1 )
/**
* hb_feature_t :
* @ tag : The # hb_tag_t tag of the feature
* @ value : The value of the feature . 0 disables the feature , non - zero ( usually
* 1 ) enables the feature . For features implemented as lookup type 3 ( like
* ' salt ' ) the @ value is a one based index into the alternates .
* @ start : the cluster to start applying this feature setting ( inclusive ) .
* @ end : the cluster to end applying this feature setting ( exclusive ) .
*
* The # hb_feature_t is the structure that holds information about requested
* feature application . The feature will be applied with the given value to all
* glyphs which are in clusters between @ start ( inclusive ) and @ end ( exclusive ) .
* Setting start to # HB_FEATURE_GLOBAL_START and end to # HB_FEATURE_GLOBAL_END
* specifies that the feature always applies to the entire buffer .
*/
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);
/**
* hb_variation_t :
* @ tag : The # hb_tag_t tag of the variation - axis name
* @ value : The value of the variation axis
*
* Data type for holding variation data . Registered OpenType
* variation - axis tags are listed in
* [ OpenType Axis Tag Registry ] ( https : //docs.microsoft.com/en-us/typography/opentype/spec/dvaraxisreg).
*
* Since : 1 . 4 . 2
*/
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);
/**
* hb_color_t :
*
* Data type for holding color values . Colors are eight bits per
* channel RGB plus alpha transparency .
*
* Since : 2 . 1 . 0
*/
typedef uint32_t hb_color_t;
/**
* HB_COLOR :
* @ b : blue channel value
* @ g : green channel value
* @ r : red channel value
* @ a : alpha channel value
*
* Constructs an # hb_color_t from four integers .
*
* Since : 2 . 1 . 0
*/
#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) & 0 xFF)
HB_EXTERN uint8_t
hb_color_get_red (hb_color_t color);
#define hb_color_get_red(color) (((color) >> 8 ) & 0 xFF)
HB_EXTERN uint8_t
hb_color_get_green (hb_color_t color);
#define hb_color_get_green(color) (((color) >> 16 ) & 0 xFF)
HB_EXTERN uint8_t
hb_color_get_blue (hb_color_t color);
#define hb_color_get_blue(color) (((color) >> 24 ) & 0 xFF)
/**
* hb_glyph_extents_t :
* @ x_bearing : Distance from the x - origin to the left extremum of the glyph .
* @ y_bearing : Distance from the top extremum of the glyph to the y - origin .
* @ width : Distance from the left extremum of the glyph to the right extremum .
* @ height : Distance from the top extremum of the glyph to the bottom extremum .
*
* Glyph extent values , measured in font units .
*
* Note that @ height is negative , in coordinate systems that grow up .
**/
typedef struct hb_glyph_extents_t {
hb_position_t x_bearing;
hb_position_t y_bearing;
hb_position_t width;
hb_position_t height;
} hb_glyph_extents_t;
/**
* hb_font_t :
*
* Data type for holding fonts .
*
*/
typedef struct hb_font_t hb_font_t;
/* Not of much use to clients. */
HB_EXTERN void *
hb_malloc (size_t size);
HB_EXTERN void *
hb_calloc (size_t nmemb, size_t size);
HB_EXTERN void *
hb_realloc (void *ptr, size_t size);
HB_EXTERN void
hb_free (void *ptr);
HB_END_DECLS
#endif /* HB_COMMON_H */
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(vorverarbeitet am 2026-09-28)
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*© Formatika GbR, Deutschland
2026-10-10
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