projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| cabec872 RR |
1 | /***************************************************************************/ |
| 2 | /* */ | |
| 3 | /* t2driver.c */ | |
| 4 | /* */ | |
| 5 | /* OpenType font driver implementation (body). */ | |
| 6 | /* */ | |
| 7 | /* Copyright 1996-2000 by */ | |
| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 9 | /* */ | |
| 10 | /* This file is part of the FreeType project, and may only be used, */ | |
| 11 | /* modified, and distributed under the terms of the FreeType project */ | |
| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 13 | /* this file you indicate that you have read the license and */ | |
| 14 | /* understand and accept it fully. */ | |
| 15 | /* */ | |
| 16 | /***************************************************************************/ | |
| 17 | ||
| 18 | ||
| 19 | #include <freetype/freetype.h> | |
| 20 | #include <freetype/internal/ftdebug.h> | |
| 21 | #include <freetype/internal/ftstream.h> | |
| 22 | #include <freetype/internal/sfnt.h> | |
| 23 | #include <freetype/ttnameid.h> | |
| 24 | ||
| 25 | #include <freetype/internal/t2errors.h> | |
| 26 | ||
| 27 | ||
| 28 | #ifdef FT_FLAT_COMPILE | |
| 29 | ||
| 30 | #include "t2driver.h" | |
| 31 | #include "t2gload.h" | |
| 32 | ||
| 33 | #else | |
| 34 | ||
| 35 | #include <cff/t2driver.h> | |
| 36 | #include <cff/t2gload.h> | |
| 37 | ||
| 38 | #endif | |
| 39 | ||
| 40 | ||
| 41 | /*************************************************************************/ | |
| 42 | /* */ | |
| 43 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ | |
| 44 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ | |
| 45 | /* messages during execution. */ | |
| 46 | /* */ | |
| 47 | #undef FT_COMPONENT | |
| 48 | #define FT_COMPONENT trace_t2driver | |
| 49 | ||
| 50 | ||
| 51 | /*************************************************************************/ | |
| 52 | /*************************************************************************/ | |
| 53 | /*************************************************************************/ | |
| 54 | /**** ****/ | |
| 55 | /**** ****/ | |
| 56 | /**** F A C E S ****/ | |
| 57 | /**** ****/ | |
| 58 | /**** ****/ | |
| 59 | /*************************************************************************/ | |
| 60 | /*************************************************************************/ | |
| 61 | /*************************************************************************/ | |
| 62 | ||
| 63 | ||
| 64 | #undef PAIR_TAG | |
| 65 | #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ | |
| 66 | (FT_ULong)right ) | |
| 67 | ||
| 68 | ||
| 69 | /*************************************************************************/ | |
| 70 | /* */ | |
| 71 | /* <Function> */ | |
| 72 | /* Get_Kerning */ | |
| 73 | /* */ | |
| 74 | /* <Description> */ | |
| 75 | /* A driver method used to return the kerning vector between two */ | |
| 76 | /* glyphs of the same face. */ | |
| 77 | /* */ | |
| 78 | /* <Input> */ | |
| 79 | /* face :: A handle to the source face object. */ | |
| 80 | /* */ | |
| 81 | /* left_glyph :: The index of the left glyph in the kern pair. */ | |
| 82 | /* */ | |
| 83 | /* right_glyph :: The index of the right glyph in the kern pair. */ | |
| 84 | /* */ | |
| 85 | /* <Output> */ | |
| 86 | /* kerning :: The kerning vector. This is in font units for */ | |
| 87 | /* scalable formats, and in pixels for fixed-sizes */ | |
| 88 | /* formats. */ | |
| 89 | /* */ | |
| 90 | /* <Return> */ | |
| 91 | /* FreeType error code. 0 means success. */ | |
| 92 | /* */ | |
| 93 | /* <Note> */ | |
| 94 | /* Only horizontal layouts (left-to-right & right-to-left) are */ | |
| 95 | /* supported by this function. Other layouts, or more sophisticated */ | |
| 96 | /* kernings, are out of scope of this method (the basic driver */ | |
| 97 | /* interface is meant to be simple). */ | |
| 98 | /* */ | |
| 99 | /* They can be implemented by format-specific interfaces. */ | |
| 100 | /* */ | |
| 101 | static | |
| 102 | FT_Error Get_Kerning( TT_Face face, | |
| 103 | FT_UInt left_glyph, | |
| 104 | FT_UInt right_glyph, | |
| 105 | FT_Vector* kerning ) | |
| 106 | { | |
| 107 | TT_Kern_0_Pair* pair; | |
| 108 | ||
| 109 | ||
| 110 | if ( !face ) | |
| 111 | return T2_Err_Invalid_Face_Handle; | |
| 112 | ||
| 113 | kerning->x = 0; | |
| 114 | kerning->y = 0; | |
| 115 | ||
| 116 | if ( face->kern_pairs ) | |
| 117 | { | |
| 118 | /* there are some kerning pairs in this font file! */ | |
| 119 | FT_ULong search_tag = PAIR_TAG( left_glyph, right_glyph ); | |
| 120 | FT_Long left, right; | |
| 121 | ||
| 122 | ||
| 123 | left = 0; | |
| 124 | right = face->num_kern_pairs - 1; | |
| 125 | ||
| 126 | while ( left <= right ) | |
| 127 | { | |
| 128 | FT_Int middle = left + ( ( right - left ) >> 1 ); | |
| 129 | FT_ULong cur_pair; | |
| 130 | ||
| 131 | ||
| 132 | pair = face->kern_pairs + middle; | |
| 133 | cur_pair = PAIR_TAG( pair->left, pair->right ); | |
| 134 | ||
| 135 | if ( cur_pair == search_tag ) | |
| 136 | goto Found; | |
| 137 | ||
| 138 | if ( cur_pair < search_tag ) | |
| 139 | left = middle + 1; | |
| 140 | else | |
| 141 | right = middle - 1; | |
| 142 | } | |
| 143 | } | |
| 144 | ||
| 145 | Exit: | |
| 146 | return T2_Err_Ok; | |
| 147 | ||
| 148 | Found: | |
| 149 | kerning->x = pair->value; | |
| 150 | goto Exit; | |
| 151 | } | |
| 152 | ||
| 153 | ||
| 154 | #undef PAIR_TAG | |
| 155 | ||
| 156 | ||
| 157 | /*************************************************************************/ | |
| 158 | /* */ | |
| 159 | /* <Function> */ | |
| 160 | /* Load_Glyph */ | |
| 161 | /* */ | |
| 162 | /* <Description> */ | |
| 163 | /* A driver method used to load a glyph within a given glyph slot. */ | |
| 164 | /* */ | |
| 165 | /* <Input> */ | |
| 166 | /* slot :: A handle to the target slot object where the glyph */ | |
| 167 | /* will be loaded. */ | |
| 168 | /* */ | |
| 169 | /* size :: A handle to the source face size at which the glyph */ | |
| 170 | /* must be scaled, loaded, etc. */ | |
| 171 | /* */ | |
| 172 | /* glyph_index :: The index of the glyph in the font file. */ | |
| 173 | /* */ | |
| 174 | /* load_flags :: A flag indicating what to load for this glyph. The */ | |
| 175 | /* FTLOAD_??? constants can be used to control the */ | |
| 176 | /* glyph loading process (e.g., whether the outline */ | |
| 177 | /* should be scaled, whether to load bitmaps or not, */ | |
| 178 | /* whether to hint the outline, etc). */ | |
| 179 | /* */ | |
| 180 | /* <Return> */ | |
| 181 | /* FreeType error code. 0 means success. */ | |
| 182 | /* */ | |
| 183 | static | |
| 184 | FT_Error Load_Glyph( T2_GlyphSlot slot, | |
| 185 | T2_Size size, | |
| 186 | FT_UShort glyph_index, | |
| 187 | FT_UInt load_flags ) | |
| 188 | { | |
| 189 | FT_Error error; | |
| 190 | ||
| 191 | ||
| 192 | if ( !slot ) | |
| 193 | return T2_Err_Invalid_Glyph_Handle; | |
| 194 | ||
| 195 | /* check whether we want a scaled outline or bitmap */ | |
| 196 | if ( !size ) | |
| 197 | load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; | |
| 198 | ||
| 199 | if ( load_flags & FT_LOAD_NO_SCALE ) | |
| 200 | size = NULL; | |
| 201 | ||
| 202 | /* reset the size object if necessary */ | |
| 203 | if ( size ) | |
| 204 | { | |
| 205 | /* these two object must have the same parent */ | |
| 206 | if ( size->face != slot->root.face ) | |
| 207 | return T2_Err_Invalid_Face_Handle; | |
| 208 | } | |
| 209 | ||
| 210 | /* now load the glyph outline if necessary */ | |
| 211 | error = T2_Load_Glyph( slot, size, glyph_index, load_flags ); | |
| 212 | ||
| 213 | /* force drop-out mode to 2 - irrelevant now */ | |
| 214 | /* slot->outline.dropout_mode = 2; */ | |
| 215 | ||
| 216 | return error; | |
| 217 | } | |
| 218 | ||
| 219 | ||
| 220 | /*************************************************************************/ | |
| 221 | /*************************************************************************/ | |
| 222 | /*************************************************************************/ | |
| 223 | /**** ****/ | |
| 224 | /**** ****/ | |
| 225 | /**** C H A R A C T E R M A P P I N G S ****/ | |
| 226 | /**** ****/ | |
| 227 | /**** ****/ | |
| 228 | /*************************************************************************/ | |
| 229 | /*************************************************************************/ | |
| 230 | /*************************************************************************/ | |
| 231 | ||
| 232 | /*************************************************************************/ | |
| 233 | /* */ | |
| 234 | /* <Function> */ | |
| 235 | /* Get_Char_Index */ | |
| 236 | /* */ | |
| 237 | /* <Description> */ | |
| 238 | /* Uses a charmap to return a given character code's glyph index. */ | |
| 239 | /* */ | |
| 240 | /* <Input> */ | |
| 241 | /* charmap :: A handle to the source charmap object. */ | |
| 242 | /* charcode :: The character code. */ | |
| 243 | /* */ | |
| 244 | /* <Return> */ | |
| 245 | /* Glyph index. 0 means `undefined character code'. */ | |
| 246 | /* */ | |
| 247 | static | |
| 248 | FT_UInt t2_get_char_index( TT_CharMap charmap, | |
| 249 | FT_Long charcode ) | |
| 250 | { | |
| 251 | FT_Error error; | |
| 252 | T2_Face face; | |
| 253 | TT_CMapTable* cmap; | |
| 254 | ||
| 255 | ||
| 256 | cmap = &charmap->cmap; | |
| 257 | face = (T2_Face)charmap->root.face; | |
| 258 | ||
| 259 | /* Load table if needed */ | |
| 260 | if ( !cmap->loaded ) | |
| 261 | { | |
| 262 | SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt; | |
| 263 | ||
| 264 | ||
| 265 | error = sfnt->load_charmap( face, cmap, face->root.stream ); | |
| 266 | if ( error ) | |
| 267 | return 0; | |
| 268 | ||
| 269 | cmap->loaded = TRUE; | |
| 270 | } | |
| 271 | ||
| 272 | return ( cmap->get_index ? cmap->get_index( cmap, charcode ) : 0 ); | |
| 273 | } | |
| 274 | ||
| 275 | ||
| 276 | /*************************************************************************/ | |
| 277 | /*************************************************************************/ | |
| 278 | /*************************************************************************/ | |
| 279 | /**** ****/ | |
| 280 | /**** ****/ | |
| 281 | /**** D R I V E R I N T E R F A C E ****/ | |
| 282 | /**** ****/ | |
| 283 | /**** ****/ | |
| 284 | /*************************************************************************/ | |
| 285 | /*************************************************************************/ | |
| 286 | /*************************************************************************/ | |
| 287 | ||
| 288 | ||
| 289 | static | |
| 290 | FT_Module_Interface t2_get_interface( T2_Driver driver, | |
| 291 | const char* interface ) | |
| 292 | { | |
| 293 | FT_Module sfnt; | |
| 294 | ||
| 295 | ||
| 296 | /* we simply pass our request to the `sfnt' module */ | |
| 297 | sfnt = FT_Get_Module( driver->root.root.library, "sfnt" ); | |
| 298 | ||
| 299 | return sfnt ? sfnt->clazz->get_interface( sfnt, interface ) : 0; | |
| 300 | } | |
| 301 | ||
| 302 | ||
| 303 | /* The FT_DriverInterface structure is defined in ftdriver.h. */ | |
| 304 | ||
| 305 | const FT_Driver_Class cff_driver_class = | |
| 306 | { | |
| 307 | /* begin with the FT_Module_Class fields */ | |
| 308 | { | |
| 309 | ft_module_font_driver | ft_module_driver_scalable, | |
| 310 | sizeof( T2_DriverRec ), | |
| 311 | "cff", | |
| 312 | 0x10000L, | |
| 313 | 0x20000L, | |
| 314 | ||
| 315 | 0, /* module-specific interface */ | |
| 316 | ||
| 317 | (FT_Module_Constructor)T2_Init_Driver, | |
| 318 | (FT_Module_Destructor) T2_Done_Driver, | |
| 319 | (FT_Module_Requester) t2_get_interface, | |
| 320 | }, | |
| 321 | ||
| 322 | /* now the specific driver fields */ | |
| 323 | sizeof( TT_FaceRec ), | |
| 324 | sizeof( FT_SizeRec ), | |
| 325 | sizeof( T2_GlyphSlotRec ), | |
| 326 | ||
| 327 | (FTDriver_initFace) T2_Init_Face, | |
| 328 | (FTDriver_doneFace) T2_Done_Face, | |
| 329 | (FTDriver_initSize) 0, | |
| 330 | (FTDriver_doneSize) 0, | |
| 331 | (FTDriver_initGlyphSlot)0, | |
| 332 | (FTDriver_doneGlyphSlot)0, | |
| 333 | ||
| 334 | (FTDriver_setCharSizes) 0, | |
| 335 | (FTDriver_setPixelSizes)0, | |
| 336 | ||
| 337 | (FTDriver_loadGlyph) Load_Glyph, | |
| 338 | (FTDriver_getCharIndex) t2_get_char_index, | |
| 339 | ||
| 340 | (FTDriver_getKerning) Get_Kerning, | |
| 341 | (FTDriver_attachFile) 0, | |
| 342 | (FTDriver_getAdvances) 0 | |
| 343 | }; | |
| 344 | ||
| 345 | ||
| 346 | #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS | |
| 347 | ||
| 348 | ||
| 349 | /*************************************************************************/ | |
| 350 | /* */ | |
| 351 | /* <Function> */ | |
| 352 | /* getDriverClass */ | |
| 353 | /* */ | |
| 354 | /* <Description> */ | |
| 355 | /* This function is used when compiling the TrueType driver as a */ | |
| 356 | /* shared library (`.DLL' or `.so'). It will be used by the */ | |
| 357 | /* high-level library of FreeType to retrieve the address of the */ | |
| 358 | /* driver's generic interface. */ | |
| 359 | /* */ | |
| 360 | /* It shouldn't be implemented in a static build, as each driver must */ | |
| 361 | /* have the same function as an exported entry point. */ | |
| 362 | /* */ | |
| 363 | /* <Return> */ | |
| 364 | /* The address of the TrueType's driver generic interface. The */ | |
| 365 | /* format-specific interface can then be retrieved through the method */ | |
| 366 | /* interface->get_format_interface. */ | |
| 367 | /* */ | |
| 368 | EXPORT_FUNC( FT_Driver_Class* ) getDriverClass( void ) | |
| 369 | { | |
| 370 | return &cff_driver_class; | |
| 371 | } | |
| 372 | ||
| 373 | ||
| 374 | #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */ | |
| 375 | ||
| 376 | ||
| 377 | /* END */ |