hb-buffer-private.hh revision 910a33fe8457a8e13f7eb77fc92fa59c31f5e8fd 
1/*
2 * Copyright (C) 1998-2004  David Turner and Werner Lemberg
3 * Copyright (C) 2004,2007,2009,2010  Red Hat, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
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.
12 *
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
17 * DAMAGE.
18 *
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.
24 *
25 * Red Hat Author(s): Owen Taylor, Behdad Esfahbod
26 */
27
28#ifndef HB_BUFFER_PRIVATE_H
29#define HB_BUFFER_PRIVATE_H
30
31#include "hb-private.h"
32#include "hb-buffer.h"
33#include "hb-unicode-private.h"
34
35HB_BEGIN_DECLS
36
37#define HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN 0xFFFF
38
39
40typedef struct _hb_internal_glyph_info_t {
41  hb_codepoint_t codepoint;
42  hb_mask_t      mask;
43  uint32_t       cluster;
44  uint16_t       component;
45  uint16_t       lig_id;
46  uint32_t       gproperty;
47} hb_internal_glyph_info_t;
48
49typedef 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 */
58} hb_internal_glyph_position_t;
59
60ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_internal_glyph_info_t));
61ASSERT_STATIC (sizeof (hb_glyph_position_t) == sizeof (hb_internal_glyph_position_t));
62ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
63
64
65HB_INTERNAL void
66_hb_buffer_swap (hb_buffer_t *buffer);
67
68HB_INTERNAL void
69_hb_buffer_clear_output (hb_buffer_t *buffer);
70
71HB_INTERNAL void
72_hb_buffer_add_output_glyphs (hb_buffer_t *buffer,
73			      unsigned int num_in,
74			      unsigned int num_out,
75			      const hb_codepoint_t *glyph_data,
76			      unsigned short component,
77			      unsigned short ligID);
78
79HB_INTERNAL void
80_hb_buffer_add_output_glyphs_be16 (hb_buffer_t *buffer,
81				   unsigned int num_in,
82				   unsigned int num_out,
83				   const uint16_t *glyph_data_be,
84				   unsigned short component,
85				   unsigned short ligID);
86
87HB_INTERNAL void
88_hb_buffer_add_output_glyph (hb_buffer_t *buffer,
89			     hb_codepoint_t glyph_index,
90			     unsigned short component,
91			     unsigned short ligID);
92
93HB_INTERNAL void
94_hb_buffer_next_glyph (hb_buffer_t *buffer);
95
96
97
98struct _hb_buffer_t {
99  hb_reference_count_t ref_count;
100
101  /* Information about how the text in the buffer should be treated */
102  hb_unicode_funcs_t *unicode;
103  hb_direction_t      direction;
104  hb_script_t         script;
105  hb_language_t       language;
106
107  /* Buffer contents */
108
109  unsigned int allocated; /* Length of allocated arrays */
110
111  hb_bool_t    have_output; /* Whether we have an output buffer going on */
112  hb_bool_t    have_positions; /* Whether we have positions */
113
114  unsigned int i; /* Cursor into ->info and ->pos arrays */
115  unsigned int len; /* Length of ->info and ->pos arrays */
116  unsigned int out_len; /* Length of ->out array */
117
118  hb_internal_glyph_info_t     *info;
119  hb_internal_glyph_info_t     *out_info;
120  hb_internal_glyph_position_t *pos;
121
122  /* Other stuff */
123
124  unsigned int max_lig_id;
125
126
127  /* Methods */
128  inline unsigned int allocate_lig_id (void) { return max_lig_id++; }
129  inline void swap (void) { _hb_buffer_swap (this); }
130  inline void clear_output (void) { _hb_buffer_clear_output (this); }
131  inline void next_glyph (void) { _hb_buffer_next_glyph (this); }
132  inline void add_output_glyphs (unsigned int num_in,
133				 unsigned int num_out,
134				 const hb_codepoint_t *glyph_data,
135				 unsigned short component,
136				 unsigned short ligID)
137  { _hb_buffer_add_output_glyphs (this, num_in, num_out, glyph_data, component, ligID); }
138  inline void add_output_glyphs_be16 (unsigned int num_in,
139				      unsigned int num_out,
140				      const uint16_t *glyph_data_be,
141				      unsigned short component,
142				      unsigned short ligID)
143  { _hb_buffer_add_output_glyphs_be16 (this, num_in, num_out, glyph_data_be, component, ligID); }
144  inline void add_output_glyph (hb_codepoint_t glyph_index,
145				unsigned short component = 0xFFFF,
146				unsigned short ligID = 0xFFFF)
147  { _hb_buffer_add_output_glyph (this, glyph_index, component, ligID); }
148  inline void replace_glyph (hb_codepoint_t glyph_index) { add_output_glyph (glyph_index); }
149};
150
151
152HB_END_DECLS
153
154#endif /* HB_BUFFER_PRIVATE_H */
155