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ftgxval.h
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1/***************************************************************************/
2/* */
3/* ftgxval.h */
4/* */
5/* FreeType API for validating TrueTypeGX/AAT tables (specification). */
6/* */
7/* Copyright 2004-2018 by */
8/* Masatake YAMATO, Redhat K.K, */
9/* David Turner, Robert Wilhelm, and Werner Lemberg. */
10/* */
11/* This file is part of the FreeType project, and may only be used, */
12/* modified, and distributed under the terms of the FreeType project */
13/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
14/* this file you indicate that you have read the license and */
15/* understand and accept it fully. */
16/* */
17/***************************************************************************/
18
19/***************************************************************************/
20/* */
21/* gxvalid is derived from both gxlayout module and otvalid module. */
22/* Development of gxlayout is supported by the Information-technology */
23/* Promotion Agency(IPA), Japan. */
24/* */
25/***************************************************************************/
26
27
28#ifndef FTGXVAL_H_
29#define FTGXVAL_H_
30
31#include <ft2build.h>
32#include FT_FREETYPE_H
33
34#ifdef FREETYPE_H
35#error "freetype.h of FreeType 1 has been loaded!"
36#error "Please fix the directory search order for header files"
37#error "so that freetype.h of FreeType 2 is found first."
38#endif
39
40
41FT_BEGIN_HEADER
42
43
44 /*************************************************************************/
45 /* */
46 /* <Section> */
47 /* gx_validation */
48 /* */
49 /* <Title> */
50 /* TrueTypeGX/AAT Validation */
51 /* */
52 /* <Abstract> */
53 /* An API to validate TrueTypeGX/AAT tables. */
54 /* */
55 /* <Description> */
56 /* This section contains the declaration of functions to validate */
57 /* some TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, */
58 /* trak, prop, lcar). */
59 /* */
60 /* <Order> */
61 /* FT_TrueTypeGX_Validate */
62 /* FT_TrueTypeGX_Free */
63 /* */
64 /* FT_ClassicKern_Validate */
65 /* FT_ClassicKern_Free */
66 /* */
67 /* FT_VALIDATE_GX_LENGTH */
68 /* FT_VALIDATE_GXXXX */
69 /* FT_VALIDATE_CKERNXXX */
70 /* */
71 /*************************************************************************/
72
73 /*************************************************************************/
74 /* */
75 /* */
76 /* Warning: Use FT_VALIDATE_XXX to validate a table. */
77 /* Following definitions are for gxvalid developers. */
78 /* */
79 /* */
80 /*************************************************************************/
81
82#define FT_VALIDATE_feat_INDEX 0
83#define FT_VALIDATE_mort_INDEX 1
84#define FT_VALIDATE_morx_INDEX 2
85#define FT_VALIDATE_bsln_INDEX 3
86#define FT_VALIDATE_just_INDEX 4
87#define FT_VALIDATE_kern_INDEX 5
88#define FT_VALIDATE_opbd_INDEX 6
89#define FT_VALIDATE_trak_INDEX 7
90#define FT_VALIDATE_prop_INDEX 8
91#define FT_VALIDATE_lcar_INDEX 9
92#define FT_VALIDATE_GX_LAST_INDEX FT_VALIDATE_lcar_INDEX
93
94
95 /*************************************************************************
96 *
97 * @macro:
98 * FT_VALIDATE_GX_LENGTH
99 *
100 * @description:
101 * The number of tables checked in this module. Use it as a parameter
102 * for the `table-length' argument of function @FT_TrueTypeGX_Validate.
103 */
104#define FT_VALIDATE_GX_LENGTH ( FT_VALIDATE_GX_LAST_INDEX + 1 )
105
106 /* */
107
108 /* Up to 0x1000 is used by otvalid.
109 Ox2xxx is reserved for feature OT extension. */
110#define FT_VALIDATE_GX_START 0x4000
111#define FT_VALIDATE_GX_BITFIELD( tag ) \
112 ( FT_VALIDATE_GX_START << FT_VALIDATE_##tag##_INDEX )
113
114
115 /**********************************************************************
116 *
117 * @enum:
118 * FT_VALIDATE_GXXXX
119 *
120 * @description:
121 * A list of bit-field constants used with @FT_TrueTypeGX_Validate to
122 * indicate which TrueTypeGX/AAT Type tables should be validated.
123 *
124 * @values:
125 * FT_VALIDATE_feat ::
126 * Validate `feat' table.
127 *
128 * FT_VALIDATE_mort ::
129 * Validate `mort' table.
130 *
131 * FT_VALIDATE_morx ::
132 * Validate `morx' table.
133 *
134 * FT_VALIDATE_bsln ::
135 * Validate `bsln' table.
136 *
137 * FT_VALIDATE_just ::
138 * Validate `just' table.
139 *
140 * FT_VALIDATE_kern ::
141 * Validate `kern' table.
142 *
143 * FT_VALIDATE_opbd ::
144 * Validate `opbd' table.
145 *
146 * FT_VALIDATE_trak ::
147 * Validate `trak' table.
148 *
149 * FT_VALIDATE_prop ::
150 * Validate `prop' table.
151 *
152 * FT_VALIDATE_lcar ::
153 * Validate `lcar' table.
154 *
155 * FT_VALIDATE_GX ::
156 * Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern,
157 * opbd, trak, prop and lcar).
158 *
159 */
160
161#define FT_VALIDATE_feat FT_VALIDATE_GX_BITFIELD( feat )
162#define FT_VALIDATE_mort FT_VALIDATE_GX_BITFIELD( mort )
163#define FT_VALIDATE_morx FT_VALIDATE_GX_BITFIELD( morx )
164#define FT_VALIDATE_bsln FT_VALIDATE_GX_BITFIELD( bsln )
165#define FT_VALIDATE_just FT_VALIDATE_GX_BITFIELD( just )
166#define FT_VALIDATE_kern FT_VALIDATE_GX_BITFIELD( kern )
167#define FT_VALIDATE_opbd FT_VALIDATE_GX_BITFIELD( opbd )
168#define FT_VALIDATE_trak FT_VALIDATE_GX_BITFIELD( trak )
169#define FT_VALIDATE_prop FT_VALIDATE_GX_BITFIELD( prop )
170#define FT_VALIDATE_lcar FT_VALIDATE_GX_BITFIELD( lcar )
171
172#define FT_VALIDATE_GX ( FT_VALIDATE_feat | \
173 FT_VALIDATE_mort | \
174 FT_VALIDATE_morx | \
175 FT_VALIDATE_bsln | \
176 FT_VALIDATE_just | \
177 FT_VALIDATE_kern | \
178 FT_VALIDATE_opbd | \
179 FT_VALIDATE_trak | \
180 FT_VALIDATE_prop | \
181 FT_VALIDATE_lcar )
182
183
184 /**********************************************************************
185 *
186 * @function:
187 * FT_TrueTypeGX_Validate
188 *
189 * @description:
190 * Validate various TrueTypeGX tables to assure that all offsets and
191 * indices are valid. The idea is that a higher-level library that
192 * actually does the text layout can access those tables without
193 * error checking (which can be quite time consuming).
194 *
195 * @input:
196 * face ::
197 * A handle to the input face.
198 *
199 * validation_flags ::
200 * A bit field that specifies the tables to be validated. See
201 * @FT_VALIDATE_GXXXX for possible values.
202 *
203 * table_length ::
204 * The size of the `tables' array. Normally, @FT_VALIDATE_GX_LENGTH
205 * should be passed.
206 *
207 * @output:
208 * tables ::
209 * The array where all validated sfnt tables are stored.
210 * The array itself must be allocated by a client.
211 *
212 * @return:
213 * FreeType error code. 0~means success.
214 *
215 * @note:
216 * This function only works with TrueTypeGX fonts, returning an error
217 * otherwise.
218 *
219 * After use, the application should deallocate the buffers pointed to by
220 * each `tables' element, by calling @FT_TrueTypeGX_Free. A NULL value
221 * indicates that the table either doesn't exist in the font, the
222 * application hasn't asked for validation, or the validator doesn't have
223 * the ability to validate the sfnt table.
224 */
225 FT_EXPORT( FT_Error )
226 FT_TrueTypeGX_Validate( FT_Face face,
227 FT_UInt validation_flags,
228 FT_Bytes tables[FT_VALIDATE_GX_LENGTH],
229 FT_UInt table_length );
230
231
232 /**********************************************************************
233 *
234 * @function:
235 * FT_TrueTypeGX_Free
236 *
237 * @description:
238 * Free the buffer allocated by TrueTypeGX validator.
239 *
240 * @input:
241 * face ::
242 * A handle to the input face.
243 *
244 * table ::
245 * The pointer to the buffer allocated by
246 * @FT_TrueTypeGX_Validate.
247 *
248 * @note:
249 * This function must be used to free the buffer allocated by
250 * @FT_TrueTypeGX_Validate only.
251 */
252 FT_EXPORT( void )
253 FT_TrueTypeGX_Free( FT_Face face,
254 FT_Bytes table );
255
256
257 /**********************************************************************
258 *
259 * @enum:
260 * FT_VALIDATE_CKERNXXX
261 *
262 * @description:
263 * A list of bit-field constants used with @FT_ClassicKern_Validate
264 * to indicate the classic kern dialect or dialects. If the selected
265 * type doesn't fit, @FT_ClassicKern_Validate regards the table as
266 * invalid.
267 *
268 * @values:
269 * FT_VALIDATE_MS ::
270 * Handle the `kern' table as a classic Microsoft kern table.
271 *
272 * FT_VALIDATE_APPLE ::
273 * Handle the `kern' table as a classic Apple kern table.
274 *
275 * FT_VALIDATE_CKERN ::
276 * Handle the `kern' as either classic Apple or Microsoft kern table.
277 */
278#define FT_VALIDATE_MS ( FT_VALIDATE_GX_START << 0 )
279#define FT_VALIDATE_APPLE ( FT_VALIDATE_GX_START << 1 )
280
281#define FT_VALIDATE_CKERN ( FT_VALIDATE_MS | FT_VALIDATE_APPLE )
282
283
284 /**********************************************************************
285 *
286 * @function:
287 * FT_ClassicKern_Validate
288 *
289 * @description:
290 * Validate classic (16-bit format) kern table to assure that the offsets
291 * and indices are valid. The idea is that a higher-level library that
292 * actually does the text layout can access those tables without error
293 * checking (which can be quite time consuming).
294 *
295 * The `kern' table validator in @FT_TrueTypeGX_Validate deals with both
296 * the new 32-bit format and the classic 16-bit format, while
297 * FT_ClassicKern_Validate only supports the classic 16-bit format.
298 *
299 * @input:
300 * face ::
301 * A handle to the input face.
302 *
303 * validation_flags ::
304 * A bit field that specifies the dialect to be validated. See
305 * @FT_VALIDATE_CKERNXXX for possible values.
306 *
307 * @output:
308 * ckern_table ::
309 * A pointer to the kern table.
310 *
311 * @return:
312 * FreeType error code. 0~means success.
313 *
314 * @note:
315 * After use, the application should deallocate the buffers pointed to by
316 * `ckern_table', by calling @FT_ClassicKern_Free. A NULL value
317 * indicates that the table doesn't exist in the font.
318 */
319 FT_EXPORT( FT_Error )
320 FT_ClassicKern_Validate( FT_Face face,
321 FT_UInt validation_flags,
322 FT_Bytes *ckern_table );
323
324
325 /**********************************************************************
326 *
327 * @function:
328 * FT_ClassicKern_Free
329 *
330 * @description:
331 * Free the buffer allocated by classic Kern validator.
332 *
333 * @input:
334 * face ::
335 * A handle to the input face.
336 *
337 * table ::
338 * The pointer to the buffer that is allocated by
339 * @FT_ClassicKern_Validate.
340 *
341 * @note:
342 * This function must be used to free the buffer allocated by
343 * @FT_ClassicKern_Validate only.
344 */
345 FT_EXPORT( void )
346 FT_ClassicKern_Free( FT_Face face,
347 FT_Bytes table );
348
349 /* */
350
351
352FT_END_HEADER
353
354#endif /* FTGXVAL_H_ */
355
356
357/* END */
tables
struct nls_table * tables
Definition: nls_base.c:22
FT_EXPORT
#define FT_EXPORT(x)
Definition: ftconfig.h:461
FT_ClassicKern_Validate
FT_ClassicKern_Validate(FT_Face face, FT_UInt validation_flags, FT_Bytes *ckern_table)
Definition: ftgxval.c:91
FT_VALIDATE_GX_LENGTH
#define FT_VALIDATE_GX_LENGTH
Definition: ftgxval.h:104
FT_ClassicKern_Free
FT_ClassicKern_Free(FT_Face face, FT_Bytes table)
Definition: ftgxval.c:126
FT_TrueTypeGX_Free
FT_TrueTypeGX_Free(FT_Face face, FT_Bytes table)
Definition: ftgxval.c:75
FT_TrueTypeGX_Validate
FT_TrueTypeGX_Validate(FT_Face face, FT_UInt validation_flags, FT_Bytes tables[FT_VALIDATE_GX_LENGTH], FT_UInt table_length)
Definition: ftgxval.c:38
FT_END_HEADER
#define FT_END_HEADER
Definition: ftheader.h:54
FT_BEGIN_HEADER
#define FT_BEGIN_HEADER
Definition: ftheader.h:36
FT_Error
int FT_Error
Definition: fttypes.h:300
FT_UInt
unsigned int FT_UInt
Definition: fttypes.h:231
FT_Bytes
const FT_Byte * FT_Bytes
Definition: fttypes.h:165
face
GLenum GLuint GLint GLenum face
Definition: glext.h:7025
FT_FaceRec_
Definition: freetype.h:1069