include/freetype/cache/ftccmap.h


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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216

/***************************************************************************/
/*                                                                         */
/*  ftccmap.h                                                              */
/*                                                                         */
/*    FreeType charmap cache (specification).                              */
/*                                                                         */
/*  Copyright 2000-2001 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef __FTCCMAP_H__
#define __FTCCMAP_H__

#include <ft2build.h>
#include FT_CACHE_H


FT_BEGIN_HEADER


  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    cache_subsystem                                                    */
  /*                                                                       */
  /*************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* @type:                                                                */
  /*    FTC_CmapCache                                                      */
  /*                                                                       */
  /* @description:                                                         */
  /*    An opaque handle used to manager a charmap cache.  This cache is   */
  /*    to hold character codes -> glyph indices mappings.                 */
  /*                                                                       */
  typedef struct FTC_CMapCacheRec_*  FTC_CMapCache;


  /*************************************************************************/
  /*                                                                       */
  /* @type:                                                                */
  /*    FTC_CMapDesc                                                       */
  /*                                                                       */
  /* @description:                                                         */
  /*    A handle to an @FTC_CMapDescRec structure used to describe a given */
  /*    charmap in a charmap cache.                                        */
  /*                                                                       */
  /*    Each @FTC_CMapDesc describes which charmap (of which @FTC_Face) we */
  /*    want to use in @FTC_CMapCache_Lookup.                              */
  /*                                                                       */
  typedef struct FTC_CMapDescRec_*  FTC_CMapDesc;


  /*************************************************************************/
  /*                                                                       */
  /* @enum:                                                                */
  /*    FTC_CMapType                                                       */
  /*                                                                       */
  /* @description:                                                         */
  /*    The list of valid @FTC_CMap types.  They indicate how we want to   */
  /*    address a charmap within an @FTC_FaceID.                           */
  /*                                                                       */
  /* @values:                                                              */
  /*    FTC_CMAP_BY_INDEX ::                                               */
  /*      Address a charmap by its index in the corresponding @FT_Face.    */
  /*                                                                       */
  /*    FTC_CMAP_BY_ENCODING ::                                            */
  /*      Use a @FT_Face charmap that corresponds to a given encoding.     */
  /*                                                                       */
  /*    FTC_CMAP_BY_ID ::                                                  */
  /*      Use an @FT_Face charmap that corresponds to a given              */
  /*      (platform,encoding) ID.  See @FTC_CMapIdRec.                     */
  /*                                                                       */
  typedef enum  FTC_CMapType_
  {
    FTC_CMAP_BY_INDEX    = 0,
    FTC_CMAP_BY_ENCODING = 1,
    FTC_CMAP_BY_ID       = 2

  } FTC_CMapType;


  /*************************************************************************/
  /*                                                                       */
  /* @struct:                                                              */
  /*    FTC_CMapIdRec                                                      */
  /*                                                                       */
  /* @description:                                                         */
  /*    A short structure to identify a charmap by a (platform,encoding)   */
  /*    pair of values.                                                    */
  /*                                                                       */
  /* @fields:                                                              */
  /*    platform :: The platform ID.                                       */
  /*                                                                       */
  /*    encoding :: The encoding ID.                                       */
  /*                                                                       */
  typedef struct  FTC_CMapIdRec_
  {
    FT_UInt  platform;
    FT_UInt  encoding;

  } FTC_CMapIdRec;


  /*************************************************************************/
  /*                                                                       */
  /* @struct:                                                              */
  /*    FTC_CMapDescRec                                                    */
  /*                                                                       */
  /* @description:                                                         */
  /*    A structure to describe a given charmap to @FTC_CMapCache.         */
  /*                                                                       */
  /* @fields:                                                              */
  /*    face_id    :: @FTC_FaceID of the face this charmap belongs to.     */
  /*                                                                       */
  /*    type       :: The type of charmap, see @FTC_CMapType.              */
  /*                                                                       */
  /*    u.index    :: For @FTC_CMAP_BY_INDEX types, this is the charmap    */
  /*                  index (within a @FT_Face) we want to use.            */
  /*                                                                       */
  /*    u.encoding :: For @FTC_CMAP_BY_ENCODING types, this is the charmap */
  /*                  encoding we want to use. see @FT_Encoding.           */
  /*                                                                       */
  /*    u.id       :: For @FTC_CMAP_BY_ID types, this is the               */
  /*                  (platform,encoding) pair we want to use. see         */
  /*                  @FTC_CMapIdRec and @FT_CharMapRec.                   */
  /*                                                                       */
  typedef struct  FTC_CMapDescRec_
  {
    FTC_FaceID    face_id;
    FTC_CMapType  type;

    union
    {
      FT_UInt        index;
      FT_Encoding    encoding;
      FTC_CMapIdRec  id;

    } u;

  } FTC_CMapDescRec;


  /*************************************************************************/
  /*                                                                       */
  /* @function:                                                            */
  /*    FTC_CMapCache_New                                                  */
  /*                                                                       */
  /* @description:                                                         */
  /*    Creates a new charmap cache.                                       */
  /*                                                                       */
  /* @input:                                                               */
  /*    manager :: A handle to the cache manager.                          */
  /*                                                                       */
  /* @output:                                                              */
  /*    acache  :: A new cache handle.  NULL in case of error.             */
  /*                                                                       */
  /* @return:                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* @note:                                                                */
  /*    Like all other caches, this one will be destroyed with the cache   */
  /*    manager.                                                           */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FTC_CMapCache_New( FTC_Manager     manager,
                     FTC_CMapCache  *acache );


  /*************************************************************************/
  /*                                                                       */
  /* @function:                                                            */
  /*    FTC_CMapCache_Lookup                                               */
  /*                                                                       */
  /* @description:                                                         */
  /*    Translates a character code into a glyph index, using the charmap  */
  /*    cache.                                                             */
  /*                                                                       */
  /* @input:                                                               */
  /*    cache     :: A charmap cache handle.                               */
  /*                                                                       */
  /*    cmap_desc :: A charmap descriptor handle.                          */
  /*                                                                       */
  /*    char_code :: The character code (in the corresponding charmap).    */
  /*                                                                       */
  /* @return:                                                              */
  /*    Glyph index.  0 means "no glyph".                                  */
  /*                                                                       */
  /* @note:                                                                */
  /*    This function doesn't return @FTC_Node handles, since there is no  */
  /*    real use for them with typical uses of charmaps.                   */
  /*                                                                       */
  FT_EXPORT( FT_UInt )
  FTC_CMapCache_Lookup( FTC_CMapCache  cache,
                        FTC_CMapDesc   cmap_desc,
                        FT_UInt32      char_code );

  /* */


FT_END_HEADER


#endif /* __FTCCMAP_H__ */


/* END */