812 lines
28 KiB
C++
812 lines
28 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
|
|
*/
|
|
|
|
#if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
|
|
#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).
|
|
* @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 the smallest cluster value 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 information about the
|
|
* glyphs and their relation to input text.
|
|
*/
|
|
typedef struct hb_glyph_info_t {
|
|
hb_codepoint_t codepoint;
|
|
/*< private >*/
|
|
hb_mask_t mask;
|
|
/*< public >*/
|
|
uint32_t cluster;
|
|
|
|
/*< private >*/
|
|
hb_var_int_t var1;
|
|
hb_var_int_t var2;
|
|
} hb_glyph_info_t;
|
|
|
|
/**
|
|
* hb_glyph_flags_t:
|
|
* @HB_GLYPH_FLAG_UNSAFE_TO_BREAK: Indicates that if input text is broken at the
|
|
* beginning of the cluster this glyph is part of,
|
|
* then both sides need to be re-shaped, as the
|
|
* result might be different.
|
|
* On the flip side, it means that when this
|
|
* flag is not present, then it is safe to break
|
|
* the glyph-run at the beginning of this
|
|
* cluster, and the two sides will represent the
|
|
* exact same result one would get if breaking
|
|
* input text at the beginning of this cluster
|
|
* and shaping the two sides separately.
|
|
* This can be used to optimize paragraph
|
|
* layout, by avoiding re-shaping of each line
|
|
* after line-breaking.
|
|
* @HB_GLYPH_FLAG_UNSAFE_TO_CONCAT: Indicates that if input text is changed on one
|
|
* side of the beginning of the cluster this glyph
|
|
* is part of, then the shaping results for the
|
|
* other side might change.
|
|
* Note that the absence of this flag will NOT by
|
|
* itself mean that it IS safe to concat text.
|
|
* Only two pieces of text both of which clear of
|
|
* this flag can be concatenated safely.
|
|
* This can be used to optimize paragraph
|
|
* layout, by avoiding re-shaping of each line
|
|
* after line-breaking, by limiting the
|
|
* reshaping to a small piece around the
|
|
* breaking position only, even if the breaking
|
|
* position carries the
|
|
* #HB_GLYPH_FLAG_UNSAFE_TO_BREAK or when
|
|
* hyphenation or other text transformation
|
|
* happens at line-break position, in the following
|
|
* way:
|
|
* 1. Iterate back from the line-break position
|
|
* until the first cluster start position that is
|
|
* NOT unsafe-to-concat, 2. shape the segment from
|
|
* there till the end of line, 3. check whether the
|
|
* resulting glyph-run also is clear of the
|
|
* unsafe-to-concat at its start-of-text position;
|
|
* if it is, just splice it into place and the line
|
|
* is shaped; If not, move on to a position further
|
|
* back that is clear of unsafe-to-concat and retry
|
|
* from there, and repeat.
|
|
* At the start of next line a similar algorithm can
|
|
* be implemented. That is: 1. Iterate forward from
|
|
* the line-break position until the first cluster
|
|
* start position that is NOT unsafe-to-concat, 2.
|
|
* shape the segment from beginning of the line to
|
|
* that position, 3. check whether the resulting
|
|
* glyph-run also is clear of the unsafe-to-concat
|
|
* at its end-of-text position; if it is, just splice
|
|
* it into place and the beginning is shaped; If not,
|
|
* move on to a position further forward that is clear
|
|
* of unsafe-to-concat and retry up to there, and repeat.
|
|
* A slight complication will arise in the
|
|
* implementation of the algorithm above,
|
|
* because while our buffer API has a way to
|
|
* return flags for position corresponding to
|
|
* start-of-text, there is currently no position
|
|
* corresponding to end-of-text. This limitation
|
|
* can be alleviated by shaping more text than needed
|
|
* and looking for unsafe-to-concat flag within text
|
|
* clusters.
|
|
* The #HB_GLYPH_FLAG_UNSAFE_TO_BREAK flag will
|
|
* always imply this flag.
|
|
* To use this flag, you must enable the buffer flag
|
|
* @HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT during
|
|
* shaping, otherwise the buffer flag will not be
|
|
* reliably produced.
|
|
* Since: 4.0.0
|
|
* @HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL: In scripts that use elongation (Arabic,
|
|
Mongolian, Syriac, etc.), this flag signifies
|
|
that it is safe to insert a U+0640 TATWEEL
|
|
character before this cluster for elongation.
|
|
This flag does not determine the
|
|
script-specific elongation places, but only
|
|
when it is safe to do the elongation without
|
|
interrupting text shaping.
|
|
Since: 5.1.0
|
|
* @HB_GLYPH_FLAG_DEFINED: All the currently defined flags.
|
|
*
|
|
* Flags for #hb_glyph_info_t.
|
|
*
|
|
* Since: 1.5.0
|
|
*/
|
|
typedef enum { /*< flags >*/
|
|
HB_GLYPH_FLAG_UNSAFE_TO_BREAK = 0x00000001,
|
|
HB_GLYPH_FLAG_UNSAFE_TO_CONCAT = 0x00000002,
|
|
HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL = 0x00000004,
|
|
|
|
HB_GLYPH_FLAG_DEFINED = 0x00000007 /* OR of all defined flags */
|
|
} hb_glyph_flags_t;
|
|
|
|
HB_EXTERN hb_glyph_flags_t
|
|
hb_glyph_info_get_glyph_flags (const hb_glyph_info_t *info);
|
|
|
|
#define hb_glyph_info_get_glyph_flags(info) \
|
|
((hb_glyph_flags_t) ((unsigned int) (info)->mask & HB_GLYPH_FLAG_DEFINED))
|
|
|
|
|
|
/**
|
|
* 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;
|
|
|
|
/**
|
|
* hb_segment_properties_t:
|
|
* @direction: the #hb_direction_t of the buffer, see hb_buffer_set_direction().
|
|
* @script: the #hb_script_t of the buffer, see hb_buffer_set_script().
|
|
* @language: the #hb_language_t of the buffer, see hb_buffer_set_language().
|
|
*
|
|
* The structure that holds various text properties of an #hb_buffer_t. Can be
|
|
* set and retrieved using hb_buffer_set_segment_properties() and
|
|
* hb_buffer_get_segment_properties(), respectively.
|
|
*/
|
|
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;
|
|
|
|
/**
|
|
* HB_SEGMENT_PROPERTIES_DEFAULT:
|
|
*
|
|
* The default #hb_segment_properties_t of of freshly created #hb_buffer_t.
|
|
*/
|
|
#define HB_SEGMENT_PROPERTIES_DEFAULT {HB_DIRECTION_INVALID, \
|
|
HB_SCRIPT_INVALID, \
|
|
HB_LANGUAGE_INVALID, \
|
|
(void *) 0, \
|
|
(void *) 0}
|
|
|
|
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_EXTERN void
|
|
hb_segment_properties_overlay (hb_segment_properties_t *p,
|
|
const hb_segment_properties_t *src);
|
|
|
|
|
|
/**
|
|
* hb_buffer_t:
|
|
*
|
|
* The main structure holding the input text and its properties before shaping,
|
|
* and output glyphs and their information after shaping.
|
|
*/
|
|
|
|
typedef struct hb_buffer_t hb_buffer_t;
|
|
|
|
HB_EXTERN hb_buffer_t *
|
|
hb_buffer_create (void);
|
|
|
|
HB_EXTERN hb_buffer_t *
|
|
hb_buffer_create_similar (const hb_buffer_t *src);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_reset (hb_buffer_t *buffer);
|
|
|
|
|
|
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 (const 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).
|
|
*
|
|
* The type of #hb_buffer_t contents.
|
|
*/
|
|
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 (const 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 (const 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 (const 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 (const 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 (const 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 (const 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 paragraph 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
|
|
* paragraph can be applied to this buffer, similar to
|
|
* @HB_BUFFER_FLAG_BOT.
|
|
* @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 hiding them (done by
|
|
* replacing them with the space glyph and zeroing the
|
|
* advance width.) This flag takes precedence over
|
|
* @HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES.
|
|
* @HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES:
|
|
* flag indication that character with Default_Ignorable
|
|
* Unicode property should be removed from glyph string
|
|
* instead of hiding them (done by replacing them with the
|
|
* space glyph and zeroing the advance width.)
|
|
* @HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES takes
|
|
* precedence over this flag. Since: 1.8.0
|
|
* @HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE:
|
|
* flag indicating that a dotted circle should
|
|
* not be inserted in the rendering of incorrect
|
|
* character sequences (such at <0905 093E>). Since: 2.4.0
|
|
* @HB_BUFFER_FLAG_VERIFY:
|
|
* flag indicating that the hb_shape() call and its variants
|
|
* should perform various verification processes on the results
|
|
* of the shaping operation on the buffer. If the verification
|
|
* fails, then either a buffer message is sent, if a message
|
|
* handler is installed on the buffer, or a message is written
|
|
* to standard error. In either case, the shaping result might
|
|
* be modified to show the failed output. Since: 3.4.0
|
|
* @HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT:
|
|
* flag indicating that the @HB_GLYPH_FLAG_UNSAFE_TO_CONCAT
|
|
* glyph-flag should be produced by the shaper. By default
|
|
* it will not be produced since it incurs a cost. Since: 4.0.0
|
|
* @HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL:
|
|
* flag indicating that the @HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL
|
|
* glyph-flag should be produced by the shaper. By default
|
|
* it will not be produced. Since: 5.1.0
|
|
* @HB_BUFFER_FLAG_DEFINED: All currently defined flags: Since: 4.4.0
|
|
*
|
|
* Flags for #hb_buffer_t.
|
|
*
|
|
* 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_FLAG_REMOVE_DEFAULT_IGNORABLES = 0x00000008u,
|
|
HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE = 0x00000010u,
|
|
HB_BUFFER_FLAG_VERIFY = 0x00000020u,
|
|
HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT = 0x00000040u,
|
|
HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL = 0x00000080u,
|
|
|
|
HB_BUFFER_FLAG_DEFINED = 0x000000FFu
|
|
} 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 (const hb_buffer_t *buffer);
|
|
|
|
/**
|
|
* hb_buffer_cluster_level_t:
|
|
* @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES: Return cluster values grouped by graphemes into
|
|
* monotone order.
|
|
* @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS: Return cluster values grouped into monotone order.
|
|
* @HB_BUFFER_CLUSTER_LEVEL_CHARACTERS: Don't group cluster values.
|
|
* @HB_BUFFER_CLUSTER_LEVEL_DEFAULT: Default cluster level,
|
|
* equal to @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES.
|
|
*
|
|
* Data type for holding HarfBuzz's clustering behavior options. The cluster level
|
|
* dictates one aspect of how HarfBuzz will treat non-base characters
|
|
* during shaping.
|
|
*
|
|
* In @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES, non-base
|
|
* characters are merged into the cluster of the base character that precedes them.
|
|
*
|
|
* In @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS, non-base characters are initially
|
|
* assigned their own cluster values, which are not merged into preceding base
|
|
* clusters. This allows HarfBuzz to perform additional operations like reorder
|
|
* sequences of adjacent marks.
|
|
*
|
|
* @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES is the default, because it maintains
|
|
* backward compatibility with older versions of HarfBuzz. New client programs that
|
|
* do not need to maintain such backward compatibility are recommended to use
|
|
* @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS instead of the default.
|
|
*
|
|
* 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 (const hb_buffer_t *buffer);
|
|
|
|
/**
|
|
* HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT:
|
|
*
|
|
* The default code point for replacing invalid characters in a given encoding.
|
|
* Set to U+FFFD REPLACEMENT CHARACTER.
|
|
*
|
|
* Since: 0.9.31
|
|
*/
|
|
#define HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT 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 (const hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_invisible_glyph (hb_buffer_t *buffer,
|
|
hb_codepoint_t invisible);
|
|
|
|
HB_EXTERN hb_codepoint_t
|
|
hb_buffer_get_invisible_glyph (const hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_not_found_glyph (hb_buffer_t *buffer,
|
|
hb_codepoint_t not_found);
|
|
|
|
HB_EXTERN hb_codepoint_t
|
|
hb_buffer_get_not_found_glyph (const hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_not_found_variation_selector_glyph (hb_buffer_t *buffer,
|
|
hb_codepoint_t not_found_variation_selector);
|
|
|
|
HB_EXTERN hb_codepoint_t
|
|
hb_buffer_get_not_found_variation_selector_glyph (const hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_set_random_state (hb_buffer_t *buffer,
|
|
unsigned state);
|
|
|
|
HB_EXTERN unsigned
|
|
hb_buffer_get_random_state (const hb_buffer_t *buffer);
|
|
|
|
/*
|
|
* Content API.
|
|
*/
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_clear_contents (hb_buffer_t *buffer);
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_pre_allocate (hb_buffer_t *buffer,
|
|
unsigned int size);
|
|
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_append (hb_buffer_t *buffer,
|
|
const hb_buffer_t *source,
|
|
unsigned int start,
|
|
unsigned int end);
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_set_length (hb_buffer_t *buffer,
|
|
unsigned int length);
|
|
|
|
HB_EXTERN unsigned int
|
|
hb_buffer_get_length (const hb_buffer_t *buffer);
|
|
|
|
/* Getting glyphs out of the buffer */
|
|
|
|
HB_EXTERN hb_glyph_info_t *
|
|
hb_buffer_get_glyph_infos (hb_buffer_t *buffer,
|
|
unsigned int *length);
|
|
|
|
HB_EXTERN hb_glyph_position_t *
|
|
hb_buffer_get_glyph_positions (hb_buffer_t *buffer,
|
|
unsigned int *length);
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_has_positions (hb_buffer_t *buffer);
|
|
|
|
|
|
HB_EXTERN void
|
|
hb_buffer_normalize_glyphs (hb_buffer_t *buffer);
|
|
|
|
|
|
/*
|
|
* Serialize
|
|
*/
|
|
|
|
/**
|
|
* hb_buffer_serialize_flags_t:
|
|
* @HB_BUFFER_SERIALIZE_FLAG_DEFAULT: serialize glyph names, clusters and positions.
|
|
* @HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS: do not serialize glyph cluster.
|
|
* @HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS: do not serialize glyph position information.
|
|
* @HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES: do no serialize glyph name.
|
|
* @HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS: serialize glyph extents.
|
|
* @HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS: serialize glyph flags. Since: 1.5.0
|
|
* @HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES: do not serialize glyph advances,
|
|
* glyph offsets will reflect absolute glyph positions. Since: 1.8.0
|
|
* @HB_BUFFER_SERIALIZE_FLAG_DEFINED: All currently defined flags. Since: 4.4.0
|
|
*
|
|
* Flags that control what glyph information are serialized in hb_buffer_serialize_glyphs().
|
|
*
|
|
* 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_FLAG_GLYPH_FLAGS = 0x00000010u,
|
|
HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES = 0x00000020u,
|
|
|
|
HB_BUFFER_SERIALIZE_FLAG_DEFINED = 0x0000003Fu
|
|
} hb_buffer_serialize_flags_t;
|
|
|
|
/**
|
|
* hb_buffer_serialize_format_t:
|
|
* @HB_BUFFER_SERIALIZE_FORMAT_TEXT: a human-readable, plain text format.
|
|
* @HB_BUFFER_SERIALIZE_FORMAT_JSON: a machine-readable JSON format.
|
|
* @HB_BUFFER_SERIALIZE_FORMAT_INVALID: invalid format.
|
|
*
|
|
* The buffer serialization and de-serialization format used in
|
|
* hb_buffer_serialize_glyphs() and hb_buffer_deserialize_glyphs().
|
|
*
|
|
* Since: 0.9.2
|
|
*/
|
|
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;
|
|
|
|
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);
|
|
|
|
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,
|
|
hb_font_t *font,
|
|
hb_buffer_serialize_format_t format,
|
|
hb_buffer_serialize_flags_t flags);
|
|
|
|
HB_EXTERN unsigned int
|
|
hb_buffer_serialize_unicode (hb_buffer_t *buffer,
|
|
unsigned int start,
|
|
unsigned int end,
|
|
char *buf,
|
|
unsigned int buf_size,
|
|
unsigned int *buf_consumed,
|
|
hb_buffer_serialize_format_t format,
|
|
hb_buffer_serialize_flags_t flags);
|
|
|
|
HB_EXTERN unsigned int
|
|
hb_buffer_serialize (hb_buffer_t *buffer,
|
|
unsigned int start,
|
|
unsigned int end,
|
|
char *buf,
|
|
unsigned int buf_size,
|
|
unsigned int *buf_consumed,
|
|
hb_font_t *font,
|
|
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,
|
|
const char **end_ptr,
|
|
hb_font_t *font,
|
|
hb_buffer_serialize_format_t format);
|
|
|
|
HB_EXTERN hb_bool_t
|
|
hb_buffer_deserialize_unicode (hb_buffer_t *buffer,
|
|
const char *buf,
|
|
int buf_len,
|
|
const char **end_ptr,
|
|
hb_buffer_serialize_format_t format);
|
|
|
|
|
|
|
|
/*
|
|
* Compare buffers
|
|
*/
|
|
|
|
/**
|
|
* hb_buffer_diff_flags_t:
|
|
* @HB_BUFFER_DIFF_FLAG_EQUAL: equal buffers.
|
|
* @HB_BUFFER_DIFF_FLAG_CONTENT_TYPE_MISMATCH: buffers with different
|
|
* #hb_buffer_content_type_t.
|
|
* @HB_BUFFER_DIFF_FLAG_LENGTH_MISMATCH: buffers with differing length.
|
|
* @HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT: `.notdef` glyph is present in the
|
|
* reference buffer.
|
|
* @HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT: dotted circle glyph is present
|
|
* in the reference buffer.
|
|
* @HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH: difference in #hb_glyph_info_t.codepoint
|
|
* @HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH: difference in #hb_glyph_info_t.cluster
|
|
* @HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH: difference in #hb_glyph_flags_t.
|
|
* @HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH: difference in #hb_glyph_position_t.
|
|
*
|
|
* Flags from comparing two #hb_buffer_t's.
|
|
*
|
|
* Buffer with different #hb_buffer_content_type_t cannot be meaningfully
|
|
* compared in any further detail.
|
|
*
|
|
* For buffers with differing length, the per-glyph comparison is not
|
|
* attempted, though we do still scan reference buffer for dotted circle and
|
|
* `.notdef` glyphs.
|
|
*
|
|
* If the buffers have the same length, we compare them glyph-by-glyph and
|
|
* report which aspect(s) of the glyph info/position are different.
|
|
*
|
|
* Since: 1.5.0
|
|
*/
|
|
typedef enum { /*< flags >*/
|
|
HB_BUFFER_DIFF_FLAG_EQUAL = 0x0000,
|
|
|
|
/* Buffers with different content_type cannot be meaningfully compared
|
|
* in any further detail. */
|
|
HB_BUFFER_DIFF_FLAG_CONTENT_TYPE_MISMATCH = 0x0001,
|
|
|
|
/* For buffers with differing length, the per-glyph comparison is not
|
|
* attempted, though we do still scan reference for dottedcircle / .notdef
|
|
* glyphs. */
|
|
HB_BUFFER_DIFF_FLAG_LENGTH_MISMATCH = 0x0002,
|
|
|
|
/* We want to know if dottedcircle / .notdef glyphs are present in the
|
|
* reference, as we may not care so much about other differences in this
|
|
* case. */
|
|
HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT = 0x0004,
|
|
HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT = 0x0008,
|
|
|
|
/* If the buffers have the same length, we compare them glyph-by-glyph
|
|
* and report which aspect(s) of the glyph info/position are different. */
|
|
HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH = 0x0010,
|
|
HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH = 0x0020,
|
|
HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH = 0x0040,
|
|
HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH = 0x0080
|
|
|
|
} hb_buffer_diff_flags_t;
|
|
|
|
/* Compare the contents of two buffers, report types of differences. */
|
|
HB_EXTERN hb_buffer_diff_flags_t
|
|
hb_buffer_diff (hb_buffer_t *buffer,
|
|
hb_buffer_t *reference,
|
|
hb_codepoint_t dottedcircle_glyph,
|
|
unsigned int position_fuzz);
|
|
|
|
|
|
/*
|
|
* Tracing.
|
|
*/
|
|
|
|
/**
|
|
* hb_buffer_message_func_t:
|
|
* @buffer: An #hb_buffer_t to work upon
|
|
* @font: The #hb_font_t the @buffer is shaped with
|
|
* @message: `NULL`-terminated message passed to the function
|
|
* @user_data: User data pointer passed by the caller
|
|
*
|
|
* A callback method for #hb_buffer_t. The method gets called with the
|
|
* #hb_buffer_t it was set on, the #hb_font_t the buffer is shaped with and a
|
|
* message describing what step of the shaping process will be performed.
|
|
* Returning `false` from this method will skip this shaping step and move to
|
|
* the next one.
|
|
*
|
|
* Return value: `true` to perform the shaping step, `false` to skip it.
|
|
*
|
|
* Since: 1.1.3
|
|
*/
|
|
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 */
|