1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* Copyright (C) 1998-2004 David Turner and Werner Lemberg
* Copyright (C) 2004,2007,2009 Red Hat, Inc.
*
* This is part of HarfBuzz, an OpenType Layout engine 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
*/
#ifndef HB_BUFFER_H
#define HB_BUFFER_H
#include "hb-common.h"
HB_BEGIN_DECLS
typedef struct _hb_buffer_t hb_buffer_t;
typedef enum _hb_direction_t {
HB_DIRECTION_LTR,
HB_DIRECTION_RTL,
HB_DIRECTION_TTB,
HB_DIRECTION_BTT
} hb_direction_t;
typedef struct _hb_glyph_info_t {
hb_codepoint_t codepoint;
hb_mask_t mask;
uint32_t cluster;
uint16_t component;
uint16_t lig_id;
uint32_t internal;
} hb_glyph_info_t;
typedef struct _hb_glyph_position_t {
hb_position_t x_pos;
hb_position_t y_pos;
hb_position_t x_advance;
hb_position_t y_advance;
/* XXX these should all be replaced by "uint32_t internal" */
unsigned short new_advance :1; /* if set, the advance width values are
absolute, i.e., they won't be
added to the original glyph's value
but rather replace them */
unsigned short back : 15; /* number of glyphs to go back
for drawing current glyph */
short cursive_chain : 16; /* character to which this connects,
may be positive or negative; used
only internally */
} hb_glyph_position_t;
hb_buffer_t *
hb_buffer_create (unsigned int pre_alloc_size);
hb_buffer_t *
hb_buffer_reference (hb_buffer_t *buffer);
unsigned int
hb_buffer_get_reference_count (hb_buffer_t *buffer);
void
hb_buffer_destroy (hb_buffer_t *buffer);
void
hb_buffer_set_direction (hb_buffer_t *buffer,
hb_direction_t direction);
hb_direction_t
hb_buffer_get_direction (hb_buffer_t *buffer);
void
hb_buffer_clear (hb_buffer_t *buffer);
void
hb_buffer_clear_positions (hb_buffer_t *buffer);
void
hb_buffer_ensure (hb_buffer_t *buffer,
unsigned int size);
void
hb_buffer_reverse (hb_buffer_t *buffer);
/* Filling the buffer in */
void
hb_buffer_add_glyph (hb_buffer_t *buffer,
hb_codepoint_t codepoint,
hb_mask_t mask,
unsigned int cluster);
void
hb_buffer_add_utf8 (hb_buffer_t *buffer,
const char *text,
unsigned int text_length,
unsigned int item_offset,
unsigned int item_length);
void
hb_buffer_add_utf16 (hb_buffer_t *buffer,
const uint16_t *text,
unsigned int text_length,
unsigned int item_offset,
unsigned int item_length);
void
hb_buffer_add_utf32 (hb_buffer_t *buffer,
const uint32_t *text,
unsigned int text_length,
unsigned int item_offset,
unsigned int item_length);
/* Getting glyphs out of the buffer */
/* Return value valid as long as buffer not modified */
unsigned int
hb_buffer_get_len (hb_buffer_t *buffer);
/* Return value valid as long as buffer not modified */
hb_glyph_info_t *
hb_buffer_get_glyph_infos (hb_buffer_t *buffer);
/* Return value valid as long as buffer not modified */
hb_glyph_position_t *
hb_buffer_get_glyph_positions (hb_buffer_t *buffer);
HB_END_DECLS
#endif /* HB_BUFFER_H */
|