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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 
41 FT_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 
352 FT_END_HEADER
353 
354 #endif /* FTGXVAL_H_ */
355 
356 
357 /* END */
FT_Error
int FT_Error
Definition: fttypes.h:300
FT_END_HEADER
#define FT_END_HEADER
Definition: ftheader.h:54
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_BEGIN_HEADER
#define FT_BEGIN_HEADER
Definition: ftheader.h:36
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_Bytes
const FT_Byte * FT_Bytes
Definition: fttypes.h:165
FT_TrueTypeGX_Free
FT_TrueTypeGX_Free(FT_Face face, FT_Bytes table)
Definition: ftgxval.c:75
FT_ClassicKern_Free
FT_ClassicKern_Free(FT_Face face, FT_Bytes table)
Definition: ftgxval.c:126
FT_UInt
unsigned int FT_UInt
Definition: fttypes.h:231
FT_EXPORT
#define FT_EXPORT(x)
Definition: ftconfig.h:461
tables
struct nls_table * tables
Definition: nls_base.c:22
FT_FaceRec_
Definition: freetype.h:1068
face
GLenum GLuint GLint GLenum face
Definition: glext.h:7025