451 lines
14 KiB
C
451 lines
14 KiB
C
/*
|
|
* Copyright © 1998-2004 David Turner and Werner Lemberg
|
|
* Copyright © 2004,2007,2009 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): Owen Taylor, Behdad Esfahbod
|
|
* Google Author(s): Behdad Esfahbod
|
|
*/
|
|
|
|
#ifndef HB_H_IN
|
|
#error "Include <hb.h> instead."
|
|
#endif
|
|
|
|
#ifndef HB_BUFFER_H
|
|
#define HB_BUFFER_H
|
|
|
|
#include "hb-common.h"
|
|
#include "hb-unicode.h"
|
|
#include "hb-font.h"
|
|
|
|
HB_BEGIN_DECLS
|
|
|
|
/**
|
|
* hb_glyph_info_t:
|
|
* @codepoint: either a Unicode code point (before shaping) or a glyph index
|
|
* (after shaping).
|
|
* @mask:
|
|
* @cluster: the index of the character in the original text that corresponds
|
|
* to this #hb_glyph_info_t, or whatever the client passes to
|
|
* hb_buffer_add(). More than one #hb_glyph_info_t can have the same
|
|
* @cluster value, if they resulted from the same character (e.g. one
|
|
* to many glyph substitution), and when more than one character gets
|
|
* merged in the same glyph (e.g. many to one glyph substitution) the
|
|
* #hb_glyph_info_t will have cluster value corresponding to the
|
|
* first of them. By default some characters are merged into the same
|
|
* cluster (e.g. combining marks have the same cluster as their
|
|
* bases) even if they are separate glyphs,
|
|
* hb_buffer_set_cluster_level() allow selecting more fine-grained
|
|
* cluster handling.
|
|
*
|
|
* The #hb_glyph_info_t is the structure that holds informations about the
|
|
* glyphs and their relation to input text.
|
|
*
|
|
*/
|
|
typedef struct hb_glyph_info_t {
|
|
hb_codepoint_t codepoint;
|
|
hb_mask_t mask;
|
|
uint32_t cluster;
|
|
|
|
/*< private >*/
|
|
hb_var_int_t var1;
|
|
hb_var_int_t var2;
|
|
} hb_glyph_info_t;
|
|
|
|
/**
|
|
* hb_glyph_position_t:
|
|
* @x_advance: how much the line advances after drawing this glyph when setting
|
|
* text in horizontal direction.
|
|
* @y_advance: how much the line advances after drawing this glyph when setting
|
|
* text in vertical direction.
|
|
* @x_offset: how much the glyph moves on the X-axis before drawing it, this
|
|
* should not affect how much the line advances.
|
|
* @y_offset: how much the glyph moves on the Y-axis before drawing it, this
|
|
* should not affect how much the line advances.
|
|
*
|
|
* The #hb_glyph_position_t is the structure that holds the positions of the
|
|
* glyph in both horizontal and vertical directions. All positions in
|
|
* #hb_glyph_position_t are relative to the current point.
|
|
*
|
|
*/
|
|
typedef struct hb_glyph_position_t {
|
|
hb_position_t x_advance;
|
|
hb_position_t y_advance;
|
|
hb_position_t x_offset;
|
|
hb_position_t y_offset;
|
|
|
|
/*< private >*/
|
|
hb_var_int_t var;
|
|
} hb_glyph_position_t;
|
|
|
|
|
|
typedef struct hb_segment_properties_t {
|
|
hb_direction_t direction;
|
|
hb_script_t script;
|
|
hb_language_t language;
|
|
/*< private >*/
|
|
void *reserved1;
|
|
void *reserved2;
|
|
} hb_segment_properties_t;
|
|
|
|
#define HB_SEGMENT_PROPERTIES_DEFAULT {HB_DIRECTION_INVALID, \
|
|
HB_SCRIPT_INVALID, \
|
|
HB_LANGUAGE_INVALID, \
|
|
NULL, \
|
|
NULL}
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_segment_properties_equal (const hb_segment_properties_t *a,
|
|
const hb_segment_properties_t *b);
|
|
|
|
HB_EXTERN unsigned int
|
|
hb_segment_properties_hash (const hb_segment_properties_t *p);
|
|
|
|
|
|
|
|
/*
|
|
* hb_buffer_t
|
|
*/
|
|
|
|
typedef struct hb_buffer_t hb_buffer_t;
|
|
|
|
HB_EXTERN hb_buffer_t *
|
|
hb_buffer_create (void);
|
|
|
|
HB_EXTERN hb_buffer_t *
|
|
hb_buffer_get_empty (void);
|
|
|
|
HB_EXTERN hb_buffer_t *
|
|
hb_buffer_reference (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_destroy (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_set_user_data (hb_buffer_t *buffer,
|
|
hb_user_data_key_t *key,
|
|
void * data,
|
|
hb_destroy_func_t destroy,
|
|
hb_bool_t replace);
|
|
|
|
HB_EXTERN void *
|
|
hb_buffer_get_user_data (hb_buffer_t *buffer,
|
|
hb_user_data_key_t *key);
|
|
|
|
/**
|
|
* hb_buffer_content_type_t:
|
|
* @HB_BUFFER_CONTENT_TYPE_INVALID: Initial value for new buffer.
|
|
* @HB_BUFFER_CONTENT_TYPE_UNICODE: The buffer contains input characters (before shaping).
|
|
* @HB_BUFFER_CONTENT_TYPE_GLYPHS: The buffer contains output glyphs (after shaping).
|
|
*/
|
|
typedef enum {
|
|
HB_BUFFER_CONTENT_TYPE_INVALID = 0,
|
|
HB_BUFFER_CONTENT_TYPE_UNICODE,
|
|
HB_BUFFER_CONTENT_TYPE_GLYPHS
|
|
} hb_buffer_content_type_t;
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_content_type (hb_buffer_t *buffer,
|
|
hb_buffer_content_type_t content_type);
|
|
|
|
HB_EXTERN hb_buffer_content_type_t
|
|
hb_buffer_get_content_type (hb_buffer_t *buffer);
|
|
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
|
|
hb_unicode_funcs_t *unicode_funcs);
|
|
|
|
HB_EXTERN hb_unicode_funcs_t *
|
|
hb_buffer_get_unicode_funcs (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_direction (hb_buffer_t *buffer,
|
|
hb_direction_t direction);
|
|
|
|
HB_EXTERN hb_direction_t
|
|
hb_buffer_get_direction (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_script (hb_buffer_t *buffer,
|
|
hb_script_t script);
|
|
|
|
HB_EXTERN hb_script_t
|
|
hb_buffer_get_script (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_language (hb_buffer_t *buffer,
|
|
hb_language_t language);
|
|
|
|
|
|
HB_EXTERN hb_language_t
|
|
hb_buffer_get_language (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_segment_properties (hb_buffer_t *buffer,
|
|
const hb_segment_properties_t *props);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_get_segment_properties (hb_buffer_t *buffer,
|
|
hb_segment_properties_t *props);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_guess_segment_properties (hb_buffer_t *buffer);
|
|
|
|
|
|
/**
|
|
* hb_buffer_flags_t:
|
|
* @HB_BUFFER_FLAG_DEFAULT: the default buffer flag.
|
|
* @HB_BUFFER_FLAG_BOT: flag indicating that special handling of the beginning
|
|
* of text can be applied to this buffer. Should usually
|
|
* be set unless you are passing to the buffer only part
|
|
* of the text without the full context.
|
|
* @HB_BUFFER_FLAG_EOT: flag indicating that special handling of the end of text
|
|
* can be applied to this buffer, similar to
|
|
* @HB_BUFFER_FLAG_EOT.
|
|
* @HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES:
|
|
* flag indication that character with Default Ignorable
|
|
* Unicode property should use the corresponding glyph
|
|
* from the font, instead of replacing them with the space
|
|
* glyph and zeroing the advance width.
|
|
*
|
|
* Since: 0.9.20
|
|
*/
|
|
typedef enum { /*< flags >*/
|
|
HB_BUFFER_FLAG_DEFAULT = 0x00000000u,
|
|
HB_BUFFER_FLAG_BOT = 0x00000001u, /* Beginning-of-text */
|
|
HB_BUFFER_FLAG_EOT = 0x00000002u, /* End-of-text */
|
|
HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES = 0x00000004u
|
|
} hb_buffer_flags_t;
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_flags (hb_buffer_t *buffer,
|
|
hb_buffer_flags_t flags);
|
|
|
|
HB_EXTERN hb_buffer_flags_t
|
|
hb_buffer_get_flags (hb_buffer_t *buffer);
|
|
|
|
/*
|
|
* Since: 0.9.42
|
|
*/
|
|
typedef enum {
|
|
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES = 0,
|
|
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS = 1,
|
|
HB_BUFFER_CLUSTER_LEVEL_CHARACTERS = 2,
|
|
HB_BUFFER_CLUSTER_LEVEL_DEFAULT = HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES
|
|
} hb_buffer_cluster_level_t;
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_cluster_level (hb_buffer_t *buffer,
|
|
hb_buffer_cluster_level_t cluster_level);
|
|
|
|
HB_EXTERN hb_buffer_cluster_level_t
|
|
hb_buffer_get_cluster_level (hb_buffer_t *buffer);
|
|
|
|
#define HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT 0xFFFDu
|
|
|
|
/* Sets codepoint used to replace invalid UTF-8/16/32 entries.
|
|
* Default is 0xFFFDu. */
|
|
HB_EXTERN void
|
|
hb_buffer_set_replacement_codepoint (hb_buffer_t *buffer,
|
|
hb_codepoint_t replacement);
|
|
|
|
HB_EXTERN hb_codepoint_t
|
|
hb_buffer_get_replacement_codepoint (hb_buffer_t *buffer);
|
|
|
|
|
|
/* Resets the buffer. Afterwards it's as if it was just created,
|
|
* except that it has a larger buffer allocated perhaps... */
|
|
HB_EXTERN void
|
|
hb_buffer_reset (hb_buffer_t *buffer);
|
|
|
|
/* Like reset, but does NOT clear unicode_funcs and replacement_codepoint. */
|
|
HB_EXTERN void
|
|
hb_buffer_clear_contents (hb_buffer_t *buffer);
|
|
|
|
/* Returns false if allocation failed */
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_pre_allocate (hb_buffer_t *buffer,
|
|
unsigned int size);
|
|
|
|
|
|
/* Returns false if allocation has failed before */
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_allocation_successful (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_reverse (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_reverse_range (hb_buffer_t *buffer,
|
|
unsigned int start, unsigned int end);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_reverse_clusters (hb_buffer_t *buffer);
|
|
|
|
|
|
/* Filling the buffer in */
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_add (hb_buffer_t *buffer,
|
|
hb_codepoint_t codepoint,
|
|
unsigned int cluster);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_add_utf8 (hb_buffer_t *buffer,
|
|
const char *text,
|
|
int text_length,
|
|
unsigned int item_offset,
|
|
int item_length);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_add_utf16 (hb_buffer_t *buffer,
|
|
const uint16_t *text,
|
|
int text_length,
|
|
unsigned int item_offset,
|
|
int item_length);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_add_utf32 (hb_buffer_t *buffer,
|
|
const uint32_t *text,
|
|
int text_length,
|
|
unsigned int item_offset,
|
|
int item_length);
|
|
|
|
/* Allows only access to first 256 Unicode codepoints. */
|
|
HB_EXTERN void
|
|
hb_buffer_add_latin1 (hb_buffer_t *buffer,
|
|
const uint8_t *text,
|
|
int text_length,
|
|
unsigned int item_offset,
|
|
int item_length);
|
|
|
|
/* Like add_utf32 but does NOT check for invalid Unicode codepoints. */
|
|
HB_EXTERN void
|
|
hb_buffer_add_codepoints (hb_buffer_t *buffer,
|
|
const hb_codepoint_t *text,
|
|
int text_length,
|
|
unsigned int item_offset,
|
|
int item_length);
|
|
|
|
|
|
/* Clears any new items added at the end */
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_set_length (hb_buffer_t *buffer,
|
|
unsigned int length);
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
HB_EXTERN unsigned int
|
|
hb_buffer_get_length (hb_buffer_t *buffer);
|
|
|
|
/* Getting glyphs out of the buffer */
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
HB_EXTERN hb_glyph_info_t *
|
|
hb_buffer_get_glyph_infos (hb_buffer_t *buffer,
|
|
unsigned int *length);
|
|
|
|
/* Return value valid as long as buffer not modified */
|
|
HB_EXTERN hb_glyph_position_t *
|
|
hb_buffer_get_glyph_positions (hb_buffer_t *buffer,
|
|
unsigned int *length);
|
|
|
|
|
|
/* Reorders a glyph buffer to have canonical in-cluster glyph order / position.
|
|
* The resulting clusters should behave identical to pre-reordering clusters.
|
|
* NOTE: This has nothing to do with Unicode normalization. */
|
|
HB_EXTERN void
|
|
hb_buffer_normalize_glyphs (hb_buffer_t *buffer);
|
|
|
|
|
|
/*
|
|
* Serialize
|
|
*/
|
|
|
|
/*
|
|
* Since: 0.9.20
|
|
*/
|
|
typedef enum { /*< flags >*/
|
|
HB_BUFFER_SERIALIZE_FLAG_DEFAULT = 0x00000000u,
|
|
HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS = 0x00000001u,
|
|
HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS = 0x00000002u,
|
|
HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES = 0x00000004u,
|
|
HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS = 0x00000008u
|
|
} hb_buffer_serialize_flags_t;
|
|
|
|
typedef enum {
|
|
HB_BUFFER_SERIALIZE_FORMAT_TEXT = HB_TAG('T','E','X','T'),
|
|
HB_BUFFER_SERIALIZE_FORMAT_JSON = HB_TAG('J','S','O','N'),
|
|
HB_BUFFER_SERIALIZE_FORMAT_INVALID = HB_TAG_NONE
|
|
} hb_buffer_serialize_format_t;
|
|
|
|
/* len=-1 means str is NUL-terminated. */
|
|
HB_EXTERN hb_buffer_serialize_format_t
|
|
hb_buffer_serialize_format_from_string (const char *str, int len);
|
|
|
|
HB_EXTERN const char *
|
|
hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format);
|
|
|
|
HB_EXTERN const char **
|
|
hb_buffer_serialize_list_formats (void);
|
|
|
|
/* Returns number of items, starting at start, that were serialized. */
|
|
HB_EXTERN unsigned int
|
|
hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
|
|
unsigned int start,
|
|
unsigned int end,
|
|
char *buf,
|
|
unsigned int buf_size,
|
|
unsigned int *buf_consumed, /* May be NULL */
|
|
hb_font_t *font, /* May be NULL */
|
|
hb_buffer_serialize_format_t format,
|
|
hb_buffer_serialize_flags_t flags);
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
|
|
const char *buf,
|
|
int buf_len, /* -1 means nul-terminated */
|
|
const char **end_ptr, /* May be NULL */
|
|
hb_font_t *font, /* May be NULL */
|
|
hb_buffer_serialize_format_t format);
|
|
|
|
|
|
/*
|
|
* Debugging.
|
|
*/
|
|
|
|
typedef hb_bool_t (*hb_buffer_message_func_t) (hb_buffer_t *buffer,
|
|
hb_font_t *font,
|
|
const char *message,
|
|
void *user_data);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_message_func (hb_buffer_t *buffer,
|
|
hb_buffer_message_func_t func,
|
|
void *user_data, hb_destroy_func_t destroy);
|
|
|
|
|
|
HB_END_DECLS
|
|
|
|
#endif /* HB_BUFFER_H */
|