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annotate libs/ft2static/freetype/ftgxval.h @ 1:e7ca128b8713

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 00:35:22 +0200
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nuclear@0 1 /***************************************************************************/
nuclear@0 2 /* */
nuclear@0 3 /* ftgxval.h */
nuclear@0 4 /* */
nuclear@0 5 /* FreeType API for validating TrueTypeGX/AAT tables (specification). */
nuclear@0 6 /* */
nuclear@0 7 /* Copyright 2004, 2005, 2006 by */
nuclear@0 8 /* Masatake YAMATO, Redhat K.K, */
nuclear@0 9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
nuclear@0 10 /* */
nuclear@0 11 /* This file is part of the FreeType project, and may only be used, */
nuclear@0 12 /* modified, and distributed under the terms of the FreeType project */
nuclear@0 13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
nuclear@0 14 /* this file you indicate that you have read the license and */
nuclear@0 15 /* understand and accept it fully. */
nuclear@0 16 /* */
nuclear@0 17 /***************************************************************************/
nuclear@0 18
nuclear@0 19 /***************************************************************************/
nuclear@0 20 /* */
nuclear@0 21 /* gxvalid is derived from both gxlayout module and otvalid module. */
nuclear@0 22 /* Development of gxlayout is supported by the Information-technology */
nuclear@0 23 /* Promotion Agency(IPA), Japan. */
nuclear@0 24 /* */
nuclear@0 25 /***************************************************************************/
nuclear@0 26
nuclear@0 27
nuclear@0 28 #ifndef __FTGXVAL_H__
nuclear@0 29 #define __FTGXVAL_H__
nuclear@0 30
nuclear@0 31 #include <ft2build.h>
nuclear@0 32 #include FT_FREETYPE_H
nuclear@0 33
nuclear@0 34 #ifdef FREETYPE_H
nuclear@0 35 #error "freetype.h of FreeType 1 has been loaded!"
nuclear@0 36 #error "Please fix the directory search order for header files"
nuclear@0 37 #error "so that freetype.h of FreeType 2 is found first."
nuclear@0 38 #endif
nuclear@0 39
nuclear@0 40
nuclear@0 41 FT_BEGIN_HEADER
nuclear@0 42
nuclear@0 43
nuclear@0 44 /*************************************************************************/
nuclear@0 45 /* */
nuclear@0 46 /* <Section> */
nuclear@0 47 /* gx_validation */
nuclear@0 48 /* */
nuclear@0 49 /* <Title> */
nuclear@0 50 /* TrueTypeGX/AAT Validation */
nuclear@0 51 /* */
nuclear@0 52 /* <Abstract> */
nuclear@0 53 /* An API to validate TrueTypeGX/AAT tables. */
nuclear@0 54 /* */
nuclear@0 55 /* <Description> */
nuclear@0 56 /* This section contains the declaration of functions to validate */
nuclear@0 57 /* some TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, */
nuclear@0 58 /* trak, prop, lcar). */
nuclear@0 59 /* */
nuclear@0 60 /*************************************************************************/
nuclear@0 61
nuclear@0 62
nuclear@0 63 /*************************************************************************/
nuclear@0 64 /* */
nuclear@0 65 /* */
nuclear@0 66 /* Warning: Use FT_VALIDATE_XXX to validate a table. */
nuclear@0 67 /* Following definitions are for gxvalid developers. */
nuclear@0 68 /* */
nuclear@0 69 /* */
nuclear@0 70 /*************************************************************************/
nuclear@0 71
nuclear@0 72 #define FT_VALIDATE_feat_INDEX 0
nuclear@0 73 #define FT_VALIDATE_mort_INDEX 1
nuclear@0 74 #define FT_VALIDATE_morx_INDEX 2
nuclear@0 75 #define FT_VALIDATE_bsln_INDEX 3
nuclear@0 76 #define FT_VALIDATE_just_INDEX 4
nuclear@0 77 #define FT_VALIDATE_kern_INDEX 5
nuclear@0 78 #define FT_VALIDATE_opbd_INDEX 6
nuclear@0 79 #define FT_VALIDATE_trak_INDEX 7
nuclear@0 80 #define FT_VALIDATE_prop_INDEX 8
nuclear@0 81 #define FT_VALIDATE_lcar_INDEX 9
nuclear@0 82 #define FT_VALIDATE_GX_LAST_INDEX FT_VALIDATE_lcar_INDEX
nuclear@0 83
nuclear@0 84
nuclear@0 85 /*************************************************************************
nuclear@0 86 *
nuclear@0 87 * @macro:
nuclear@0 88 * FT_VALIDATE_GX_LENGTH
nuclear@0 89 *
nuclear@0 90 * @description:
nuclear@0 91 * The number of tables checked in this module. Use it as a parameter
nuclear@0 92 * for the `table-length' argument of function @FT_TrueTypeGX_Validate.
nuclear@0 93 */
nuclear@0 94 #define FT_VALIDATE_GX_LENGTH (FT_VALIDATE_GX_LAST_INDEX + 1)
nuclear@0 95
nuclear@0 96 /* */
nuclear@0 97
nuclear@0 98 /* Up to 0x1000 is used by otvalid.
nuclear@0 99 Ox2xxx is reserved for feature OT extension. */
nuclear@0 100 #define FT_VALIDATE_GX_START 0x4000
nuclear@0 101 #define FT_VALIDATE_GX_BITFIELD( tag ) \
nuclear@0 102 ( FT_VALIDATE_GX_START << FT_VALIDATE_##tag##_INDEX )
nuclear@0 103
nuclear@0 104
nuclear@0 105 /**********************************************************************
nuclear@0 106 *
nuclear@0 107 * @enum:
nuclear@0 108 * FT_VALIDATE_GXXXX
nuclear@0 109 *
nuclear@0 110 * @description:
nuclear@0 111 * A list of bit-field constants used with @FT_TrueTypeGX_Validate to
nuclear@0 112 * indicate which TrueTypeGX/AAT Type tables should be validated.
nuclear@0 113 *
nuclear@0 114 * @values:
nuclear@0 115 * FT_VALIDATE_feat ::
nuclear@0 116 * Validate `feat' table.
nuclear@0 117 *
nuclear@0 118 * FT_VALIDATE_mort ::
nuclear@0 119 * Validate `mort' table.
nuclear@0 120 *
nuclear@0 121 * FT_VALIDATE_morx ::
nuclear@0 122 * Validate `morx' table.
nuclear@0 123 *
nuclear@0 124 * FT_VALIDATE_bsln ::
nuclear@0 125 * Validate `bsln' table.
nuclear@0 126 *
nuclear@0 127 * FT_VALIDATE_just ::
nuclear@0 128 * Validate `just' table.
nuclear@0 129 *
nuclear@0 130 * FT_VALIDATE_kern ::
nuclear@0 131 * Validate `kern' table.
nuclear@0 132 *
nuclear@0 133 * FT_VALIDATE_opbd ::
nuclear@0 134 * Validate `opbd' table.
nuclear@0 135 *
nuclear@0 136 * FT_VALIDATE_trak ::
nuclear@0 137 * Validate `trak' table.
nuclear@0 138 *
nuclear@0 139 * FT_VALIDATE_prop ::
nuclear@0 140 * Validate `prop' table.
nuclear@0 141 *
nuclear@0 142 * FT_VALIDATE_lcar ::
nuclear@0 143 * Validate `lcar' table.
nuclear@0 144 *
nuclear@0 145 * FT_VALIDATE_GX ::
nuclear@0 146 * Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern,
nuclear@0 147 * opbd, trak, prop and lcar).
nuclear@0 148 *
nuclear@0 149 */
nuclear@0 150
nuclear@0 151 #define FT_VALIDATE_feat FT_VALIDATE_GX_BITFIELD( feat )
nuclear@0 152 #define FT_VALIDATE_mort FT_VALIDATE_GX_BITFIELD( mort )
nuclear@0 153 #define FT_VALIDATE_morx FT_VALIDATE_GX_BITFIELD( morx )
nuclear@0 154 #define FT_VALIDATE_bsln FT_VALIDATE_GX_BITFIELD( bsln )
nuclear@0 155 #define FT_VALIDATE_just FT_VALIDATE_GX_BITFIELD( just )
nuclear@0 156 #define FT_VALIDATE_kern FT_VALIDATE_GX_BITFIELD( kern )
nuclear@0 157 #define FT_VALIDATE_opbd FT_VALIDATE_GX_BITFIELD( opbd )
nuclear@0 158 #define FT_VALIDATE_trak FT_VALIDATE_GX_BITFIELD( trak )
nuclear@0 159 #define FT_VALIDATE_prop FT_VALIDATE_GX_BITFIELD( prop )
nuclear@0 160 #define FT_VALIDATE_lcar FT_VALIDATE_GX_BITFIELD( lcar )
nuclear@0 161
nuclear@0 162 #define FT_VALIDATE_GX ( FT_VALIDATE_feat | \
nuclear@0 163 FT_VALIDATE_mort | \
nuclear@0 164 FT_VALIDATE_morx | \
nuclear@0 165 FT_VALIDATE_bsln | \
nuclear@0 166 FT_VALIDATE_just | \
nuclear@0 167 FT_VALIDATE_kern | \
nuclear@0 168 FT_VALIDATE_opbd | \
nuclear@0 169 FT_VALIDATE_trak | \
nuclear@0 170 FT_VALIDATE_prop | \
nuclear@0 171 FT_VALIDATE_lcar )
nuclear@0 172
nuclear@0 173
nuclear@0 174 /* */
nuclear@0 175
nuclear@0 176 /**********************************************************************
nuclear@0 177 *
nuclear@0 178 * @function:
nuclear@0 179 * FT_TrueTypeGX_Validate
nuclear@0 180 *
nuclear@0 181 * @description:
nuclear@0 182 * Validate various TrueTypeGX tables to assure that all offsets and
nuclear@0 183 * indices are valid. The idea is that a higher-level library which
nuclear@0 184 * actually does the text layout can access those tables without
nuclear@0 185 * error checking (which can be quite time consuming).
nuclear@0 186 *
nuclear@0 187 * @input:
nuclear@0 188 * face ::
nuclear@0 189 * A handle to the input face.
nuclear@0 190 *
nuclear@0 191 * validation_flags ::
nuclear@0 192 * A bit field which specifies the tables to be validated. See
nuclear@0 193 * @FT_VALIDATE_GXXXX for possible values.
nuclear@0 194 *
nuclear@0 195 * table_length ::
nuclear@0 196 * The size of the `tables' array. Normally, @FT_VALIDATE_GX_LENGTH
nuclear@0 197 * should be passed.
nuclear@0 198 *
nuclear@0 199 * @output:
nuclear@0 200 * tables ::
nuclear@0 201 * The array where all validated sfnt tables are stored.
nuclear@0 202 * The array itself must be allocated by a client.
nuclear@0 203 *
nuclear@0 204 * @return:
nuclear@0 205 * FreeType error code. 0~means success.
nuclear@0 206 *
nuclear@0 207 * @note:
nuclear@0 208 * This function only works with TrueTypeGX fonts, returning an error
nuclear@0 209 * otherwise.
nuclear@0 210 *
nuclear@0 211 * After use, the application should deallocate the buffers pointed to by
nuclear@0 212 * each `tables' element, by calling @FT_TrueTypeGX_Free. A NULL value
nuclear@0 213 * indicates that the table either doesn't exist in the font, the
nuclear@0 214 * application hasn't asked for validation, or the validator doesn't have
nuclear@0 215 * the ability to validate the sfnt table.
nuclear@0 216 */
nuclear@0 217 FT_EXPORT( FT_Error )
nuclear@0 218 FT_TrueTypeGX_Validate( FT_Face face,
nuclear@0 219 FT_UInt validation_flags,
nuclear@0 220 FT_Bytes tables[FT_VALIDATE_GX_LENGTH],
nuclear@0 221 FT_UInt table_length );
nuclear@0 222
nuclear@0 223
nuclear@0 224 /* */
nuclear@0 225
nuclear@0 226 /**********************************************************************
nuclear@0 227 *
nuclear@0 228 * @function:
nuclear@0 229 * FT_TrueTypeGX_Free
nuclear@0 230 *
nuclear@0 231 * @description:
nuclear@0 232 * Free the buffer allocated by TrueTypeGX validator.
nuclear@0 233 *
nuclear@0 234 * @input:
nuclear@0 235 * face ::
nuclear@0 236 * A handle to the input face.
nuclear@0 237 *
nuclear@0 238 * table ::
nuclear@0 239 * The pointer to the buffer allocated by
nuclear@0 240 * @FT_TrueTypeGX_Validate.
nuclear@0 241 *
nuclear@0 242 * @note:
nuclear@0 243 * This function must be used to free the buffer allocated by
nuclear@0 244 * @FT_TrueTypeGX_Validate only.
nuclear@0 245 */
nuclear@0 246 FT_EXPORT( void )
nuclear@0 247 FT_TrueTypeGX_Free( FT_Face face,
nuclear@0 248 FT_Bytes table );
nuclear@0 249
nuclear@0 250
nuclear@0 251 /* */
nuclear@0 252
nuclear@0 253 /**********************************************************************
nuclear@0 254 *
nuclear@0 255 * @enum:
nuclear@0 256 * FT_VALIDATE_CKERNXXX
nuclear@0 257 *
nuclear@0 258 * @description:
nuclear@0 259 * A list of bit-field constants used with @FT_ClassicKern_Validate
nuclear@0 260 * to indicate the classic kern dialect or dialects. If the selected
nuclear@0 261 * type doesn't fit, @FT_ClassicKern_Validate regards the table as
nuclear@0 262 * invalid.
nuclear@0 263 *
nuclear@0 264 * @values:
nuclear@0 265 * FT_VALIDATE_MS ::
nuclear@0 266 * Handle the `kern' table as a classic Microsoft kern table.
nuclear@0 267 *
nuclear@0 268 * FT_VALIDATE_APPLE ::
nuclear@0 269 * Handle the `kern' table as a classic Apple kern table.
nuclear@0 270 *
nuclear@0 271 * FT_VALIDATE_CKERN ::
nuclear@0 272 * Handle the `kern' as either classic Apple or Microsoft kern table.
nuclear@0 273 */
nuclear@0 274 #define FT_VALIDATE_MS ( FT_VALIDATE_GX_START << 0 )
nuclear@0 275 #define FT_VALIDATE_APPLE ( FT_VALIDATE_GX_START << 1 )
nuclear@0 276
nuclear@0 277 #define FT_VALIDATE_CKERN ( FT_VALIDATE_MS | FT_VALIDATE_APPLE )
nuclear@0 278
nuclear@0 279
nuclear@0 280 /* */
nuclear@0 281
nuclear@0 282 /**********************************************************************
nuclear@0 283 *
nuclear@0 284 * @function:
nuclear@0 285 * FT_ClassicKern_Validate
nuclear@0 286 *
nuclear@0 287 * @description:
nuclear@0 288 * Validate classic (16-bit format) kern table to assure that the offsets
nuclear@0 289 * and indices are valid. The idea is that a higher-level library which
nuclear@0 290 * actually does the text layout can access those tables without error
nuclear@0 291 * checking (which can be quite time consuming).
nuclear@0 292 *
nuclear@0 293 * The `kern' table validator in @FT_TrueTypeGX_Validate deals with both
nuclear@0 294 * the new 32-bit format and the classic 16-bit format, while
nuclear@0 295 * FT_ClassicKern_Validate only supports the classic 16-bit format.
nuclear@0 296 *
nuclear@0 297 * @input:
nuclear@0 298 * face ::
nuclear@0 299 * A handle to the input face.
nuclear@0 300 *
nuclear@0 301 * validation_flags ::
nuclear@0 302 * A bit field which specifies the dialect to be validated. See
nuclear@0 303 * @FT_VALIDATE_CKERNXXX for possible values.
nuclear@0 304 *
nuclear@0 305 * @output:
nuclear@0 306 * ckern_table ::
nuclear@0 307 * A pointer to the kern table.
nuclear@0 308 *
nuclear@0 309 * @return:
nuclear@0 310 * FreeType error code. 0~means success.
nuclear@0 311 *
nuclear@0 312 * @note:
nuclear@0 313 * After use, the application should deallocate the buffers pointed to by
nuclear@0 314 * `ckern_table', by calling @FT_ClassicKern_Free. A NULL value
nuclear@0 315 * indicates that the table doesn't exist in the font.
nuclear@0 316 */
nuclear@0 317 FT_EXPORT( FT_Error )
nuclear@0 318 FT_ClassicKern_Validate( FT_Face face,
nuclear@0 319 FT_UInt validation_flags,
nuclear@0 320 FT_Bytes *ckern_table );
nuclear@0 321
nuclear@0 322
nuclear@0 323 /* */
nuclear@0 324
nuclear@0 325 /**********************************************************************
nuclear@0 326 *
nuclear@0 327 * @function:
nuclear@0 328 * FT_ClassicKern_Free
nuclear@0 329 *
nuclear@0 330 * @description:
nuclear@0 331 * Free the buffer allocated by classic Kern validator.
nuclear@0 332 *
nuclear@0 333 * @input:
nuclear@0 334 * face ::
nuclear@0 335 * A handle to the input face.
nuclear@0 336 *
nuclear@0 337 * table ::
nuclear@0 338 * The pointer to the buffer that is allocated by
nuclear@0 339 * @FT_ClassicKern_Validate.
nuclear@0 340 *
nuclear@0 341 * @note:
nuclear@0 342 * This function must be used to free the buffer allocated by
nuclear@0 343 * @FT_ClassicKern_Validate only.
nuclear@0 344 */
nuclear@0 345 FT_EXPORT( void )
nuclear@0 346 FT_ClassicKern_Free( FT_Face face,
nuclear@0 347 FT_Bytes table );
nuclear@0 348
nuclear@0 349
nuclear@0 350 /* */
nuclear@0 351
nuclear@0 352
nuclear@0 353 FT_END_HEADER
nuclear@0 354
nuclear@0 355 #endif /* __FTGXVAL_H__ */
nuclear@0 356
nuclear@0 357
nuclear@0 358 /* END */