2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg
3 * Copyright (C) 2004,2007,2009 Red Hat, Inc.
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Red Hat Author(s): Owen Taylor, Behdad Esfahbod
28 #ifndef HB_BUFFER_PRIVATE_H
29 #define HB_BUFFER_PRIVATE_H
31 #include "hb-private.h"
32 #include "hb-buffer.h"
33 #include "hb-unicode-private.h"
37 #define HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN 0xFFFF
40 typedef struct _hb_internal_glyph_info_t {
41 hb_codepoint_t codepoint;
47 } hb_internal_glyph_info_t;
49 typedef struct _hb_internal_glyph_position_t {
50 hb_position_t x_advance;
51 hb_position_t y_advance;
52 hb_position_t x_offset;
53 hb_position_t y_offset;
54 uint32_t back : 16; /* number of glyphs to go back
55 for drawing current glyph */
56 int32_t cursive_chain : 16; /* character to which this connects,
57 may be positive or negative; used
59 } hb_internal_glyph_position_t;
61 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_internal_glyph_info_t));
62 ASSERT_STATIC (sizeof (hb_glyph_position_t) == sizeof (hb_internal_glyph_position_t));
63 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
67 hb_reference_count_t ref_count;
69 /* Information about how the text in the buffer should be treated */
70 hb_unicode_funcs_t *unicode;
71 hb_direction_t direction;
73 hb_language_t language;
77 unsigned int allocated;
79 hb_bool_t have_output; /* whether we have an output buffer going on */
80 hb_bool_t have_positions; /* whether we have positions */
81 unsigned int in_length;
82 unsigned int out_length;
84 unsigned int out_pos; /* out_length and out_pos are actually always the same */
86 hb_internal_glyph_info_t *in_string;
87 hb_internal_glyph_info_t *out_string;
88 hb_internal_glyph_position_t *positions;
92 unsigned int max_lig_id;
97 _hb_buffer_swap (hb_buffer_t *buffer);
100 _hb_buffer_clear_output (hb_buffer_t *buffer);
103 _hb_buffer_add_output_glyphs (hb_buffer_t *buffer,
105 unsigned int num_out,
106 const hb_codepoint_t *glyph_data,
107 unsigned short component,
108 unsigned short ligID);
111 _hb_buffer_add_output_glyphs_be16 (hb_buffer_t *buffer,
113 unsigned int num_out,
114 const uint16_t *glyph_data_be,
115 unsigned short component,
116 unsigned short ligID);
119 _hb_buffer_add_output_glyph (hb_buffer_t *buffer,
120 hb_codepoint_t glyph_index,
121 unsigned short component,
122 unsigned short ligID);
125 _hb_buffer_next_glyph (hb_buffer_t *buffer);
128 _hb_buffer_replace_glyph (hb_buffer_t *buffer,
129 hb_codepoint_t glyph_index);
131 HB_INTERNAL unsigned short
132 _hb_buffer_allocate_lig_id (hb_buffer_t *buffer);
136 #define BUFFER buffer
139 /* convenience macros */
140 #define IN_GLYPH(pos) (BUFFER->in_string[(pos)].codepoint)
141 #define IN_INFO(pos) (&BUFFER->in_string[(pos)])
142 #define IN_CURGLYPH() (BUFFER->in_string[BUFFER->in_pos].codepoint)
143 #define IN_NEXTGLYPH() (BUFFER->in_string[BUFFER->in_pos + 1].codepoint)
144 #define IN_CURINFO() (&BUFFER->in_string[BUFFER->in_pos])
145 #define IN_MASK(pos) (BUFFER->in_string[(pos)].mask)
146 #define IN_CLUSTER(pos) (BUFFER->in_string[(pos)].cluster)
147 #define IN_LIGID(pos) (BUFFER->in_string[(pos)].lig_id)
148 #define IN_COMPONENT(pos) (BUFFER->in_string[(pos)].component)
149 #define POSITION(pos) (&BUFFER->positions[(pos)])
150 #define CURPOSITION() (&BUFFER->positions[BUFFER->in_pos])
151 #define OUT_GLYPH(pos) (BUFFER->out_string[(pos)].codepoint)
152 #define OUT_INFO(pos) (&BUFFER->out_string[(pos)])
156 #endif /* HB_BUFFER_PRIVATE_H */