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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
|
/***************************************************************************/
/* */
/* ftcimage.h */
/* */
/* FreeType Image cache (specification). */
/* */
/* Copyright 2000-2001, 2002, 2003 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* Each image cache really manages FT_Glyph objects. */
/* */
/*************************************************************************/
#ifndef __FTCIMAGE_H__
#define __FTCIMAGE_H__
#include <ft2build.h>
#include FT_CACHE_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* cache_subsystem */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** IMAGE CACHE OBJECT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* FTC_ImageTypeRec
*
* @description:
* A simple structure used to describe the type of glyph image to be
* loaded into the cache.
*
* @fields:
* font :: An @FTC_FontRec used to describe the glyph's face and size.
*
* flags :: The load flags to be applied when loading the glyph; see
* the @FT_LOAD_XXX constants for details.
*
* @note:
* This type completely replaces the @FTC_Image_Desc structure which is
* now obsolete.
*/
typedef struct FTC_ImageTypeRec_
{
FTC_FontRec font;
FT_Int32 flags;
} FTC_ImageTypeRec;
typedef struct FTC_ImageTypeRec_* FTC_ImageType;
/* */
#define FTC_IMAGE_TYPE_COMPARE( d1, d2 ) \
( FTC_FONT_COMPARE( &(d1)->font, &(d2)->font ) && \
(d1)->flags == (d2)->flags )
#define FTC_IMAGE_TYPE_HASH( d ) \
(FT_UFast)( FTC_FONT_HASH( &(d)->font ) ^ \
( (d)->flags << 4 ) )
/*************************************************************************/
/* */
/* <Type> */
/* FTC_ImageCache */
/* */
/* <Description> */
/* A handle to an glyph image cache object. They are designed to */
/* hold many distinct glyph images while not exceeding a certain */
/* memory threshold. */
/* */
typedef struct FTC_ImageCacheRec_* FTC_ImageCache;
/*************************************************************************/
/* */
/* <Function> */
/* FTC_ImageCache_New */
/* */
/* <Description> */
/* Creates a new glyph image cache. */
/* */
/* <Input> */
/* manager :: The parent manager for the image cache. */
/* */
/* <Output> */
/* acache :: A handle to the new glyph image cache object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error )
FTC_ImageCache_New( FTC_Manager manager,
FTC_ImageCache *acache );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_ImageCache_Lookup */
/* */
/* <Description> */
/* Retrieves a given glyph image from a glyph image cache. */
/* */
/* <Input> */
/* cache :: A handle to the source glyph image cache. */
/* */
/* type :: A pointer to a glyph image type descriptor. */
/* */
/* gindex :: The glyph index to retrieve. */
/* */
/* <Output> */
/* aglyph :: The corresponding @FT_Glyph object. 0 in case of */
/* failure. */
/* */
/* anode :: Used to return the address of of the corresponding cache */
/* node after incrementing its reference count (see note */
/* below). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The returned glyph is owned and managed by the glyph image cache. */
/* Never try to transform or discard it manually! You can however */
/* create a copy with @FT_Glyph_Copy and modify the new one. */
/* */
/* If "anode" is _not_ NULL, it receives the address of the cache */
/* node containing the glyph image, after increasing its reference */
/* count. This ensures that the node (as well as the FT_Glyph) will */
/* always be kept in the cache until you call @FTC_Node_Unref to */
/* "release" it. */
/* */
/* If "anode" is NULL, the cache node is left unchanged, which means */
/* that the FT_Glyph could be flushed out of the cache on the next */
/* call to one of the caching sub-system APIs. Don't assume that it */
/* is persistent! */
/* */
FT_EXPORT( FT_Error )
FTC_ImageCache_Lookup( FTC_ImageCache cache,
FTC_ImageType type,
FT_UInt gindex,
FT_Glyph *aglyph,
FTC_Node *anode );
/* */
#define ftc_image_format( x ) ( (x) & 7 )
#define ftc_image_format_bitmap 0x0000
#define ftc_image_format_outline 0x0001
#define ftc_image_format_mask 0x000F
#define ftc_image_flag_monochrome 0x0010
#define ftc_image_flag_unhinted 0x0020
#define ftc_image_flag_autohinted 0x0040
#define ftc_image_flag_unscaled 0x0080
#define ftc_image_flag_no_sbits 0x0100
/* monochrome bitmap */
#define ftc_image_mono ftc_image_format_bitmap | \
ftc_image_flag_monochrome
/* anti-aliased bitmap */
#define ftc_image_grays ftc_image_format_bitmap
/* scaled outline */
#define ftc_image_outline ftc_image_format_outline
/*************************************************************************/
/* */
/* <Struct> */
/* FTC_Image_Desc */
/* */
/* <Description> */
/* THIS TYPE IS DEPRECATED. Use @FTC_ImageTypeRec instead. */
/* */
/* A simple structure used to describe a given glyph image category. */
/* */
/* <Fields> */
/* font :: An @FTC_FontRec used to describe the glyph's face */
/* and size. */
/* */
/* image_type :: The glyph image's type. */
/* */
typedef struct FTC_Image_Desc_
{
FTC_FontRec font;
FT_UInt image_type;
} FTC_Image_Desc;
/*************************************************************************/
/* */
/* <Type> */
/* FTC_Image_Cache */
/* */
/* <Description> */
/* THIS TYPE IS DEPRECATED. Use @FTC_ImageCache instead. */
/* */
typedef FTC_ImageCache FTC_Image_Cache;
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_New */
/* */
/* <Description> */
/* THIS FUNCTION IS DEPRECATED. Use @FTC_ImageCache_New instead. */
/* */
/* Creates a new glyph image cache. */
/* */
/* <Input> */
/* manager :: The parent manager for the image cache. */
/* */
/* <Output> */
/* acache :: A handle to the new glyph image cache object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error )
FTC_Image_Cache_New( FTC_Manager manager,
FTC_Image_Cache *acache );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_Lookup */
/* */
/* <Description> */
/* THIS FUNCTION IS DEPRECATED. Use @FTC_ImageCache_Lookup instead. */
/* */
/* <Input> */
/* cache :: A handle to the source glyph image cache. */
/* */
/* desc :: A pointer to a glyph image descriptor. */
/* */
/* gindex :: The glyph index to retrieve. */
/* */
/* <Output> */
/* aglyph :: The corresponding @FT_Glyph object. 0 in case of */
/* failure. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The returned glyph is owned and managed by the glyph image cache. */
/* Never try to transform or discard it manually! You can however */
/* create a copy with @FT_Glyph_Copy and modify the new one. */
/* */
/* Because the glyph image cache limits the total amount of memory */
/* taken by the glyphs it holds, the returned glyph might disappear */
/* on a later invocation of this function! It is a cache after */
/* all... */
/* */
/* Use this function to "lock" the glyph as long as it is needed. */
/* */
FT_EXPORT( FT_Error )
FTC_Image_Cache_Lookup( FTC_Image_Cache cache,
FTC_Image_Desc* desc,
FT_UInt gindex,
FT_Glyph *aglyph );
/* */
FT_END_HEADER
#endif /* __FTCIMAGE_H__ */
/* END */
|