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, an OpenType Layout engine 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 {
52 hb_position_t x_advance;
53 hb_position_t y_advance;
54 uint32_t new_advance :1; /* if set, the advance width values are
55 absolute, i.e., they won't be
56 added to the original glyph's value
57 but rather replace them */
58 uint32_t back : 15; /* number of glyphs to go back
59 for drawing current glyph */
60 int32_t cursive_chain : 16; /* character to which this connects,
61 may be positive or negative; used
63 } hb_internal_glyph_position_t;
65 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_internal_glyph_info_t));
66 ASSERT_STATIC (sizeof (hb_glyph_position_t) == sizeof (hb_internal_glyph_position_t));
67 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
71 hb_reference_count_t ref_count;
73 /* Information about how the text in the buffer should be treated */
75 hb_unicode_funcs_t *unicode;
76 hb_direction_t direction;
81 unsigned int allocated;
83 hb_bool_t have_output; /* weather we have an output buffer going on */
84 unsigned int in_length;
85 unsigned int out_length;
87 unsigned int out_pos; /* out_length and out_pos are actually always the same */
89 hb_internal_glyph_info_t *in_string;
90 hb_internal_glyph_info_t *out_string;
91 hb_internal_glyph_position_t *positions;
95 unsigned int max_lig_id;
100 _hb_buffer_swap (hb_buffer_t *buffer);
103 _hb_buffer_clear_output (hb_buffer_t *buffer);
106 _hb_buffer_add_output_glyphs (hb_buffer_t *buffer,
108 unsigned int num_out,
109 const uint16_t *glyph_data_be,
110 unsigned short component,
111 unsigned short ligID);
114 _hb_buffer_add_output_glyph (hb_buffer_t *buffer,
115 hb_codepoint_t glyph_index,
116 unsigned short component,
117 unsigned short ligID);
120 _hb_buffer_next_glyph (hb_buffer_t *buffer);
123 _hb_buffer_replace_glyph (hb_buffer_t *buffer,
124 hb_codepoint_t glyph_index);
126 HB_INTERNAL unsigned short
127 _hb_buffer_allocate_lig_id (hb_buffer_t *buffer);
130 /* convenience macros */
131 #define IN_GLYPH(pos) (buffer->in_string[(pos)].codepoint)
132 #define IN_INFO(pos) (&buffer->in_string[(pos)])
133 #define IN_CURGLYPH() (buffer->in_string[buffer->in_pos].codepoint)
134 #define IN_CURINFO() (&buffer->in_string[buffer->in_pos])
135 #define IN_MASK(pos) (buffer->in_string[(pos)].mask)
136 #define IN_LIGID(pos) (buffer->in_string[(pos)].lig_id)
137 #define IN_COMPONENT(pos) (buffer->in_string[(pos)].component)
138 #define POSITION(pos) (&buffer->positions[(pos)])
139 #define CURPOSITION() (&buffer->positions[buffer->in_pos])
140 #define OUT_GLYPH(pos) (buffer->out_string[(pos)].codepoint)
141 #define OUT_INFO(pos) (&buffer->out_string[(pos)])
145 #endif /* HB_BUFFER_PRIVATE_H */