| | 1 | /***************************************************************************/ |
| | 2 | /* */ |
| | 3 | /* ttdriver.c */ |
| | 4 | /* */ |
| | 5 | /* TrueType 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/internal/ftdebug.h> |
| | 20 | #include <freetype/internal/ftstream.h> |
| | 21 | #include <freetype/internal/sfnt.h> |
| | 22 | #include <freetype/ttnameid.h> |
| | 23 | |
| | 24 | |
| | 25 | #ifdef FT_FLAT_COMPILE |
| | 26 | |
| | 27 | #include "ttdriver.h" |
| | 28 | #include "ttgload.h" |
| | 29 | |
| | 30 | #else |
| | 31 | |
| | 32 | #include <truetype/ttdriver.h> |
| | 33 | #include <truetype/ttgload.h> |
| | 34 | |
| | 35 | #endif |
| | 36 | |
| | 37 | |
| | 38 | /*************************************************************************/ |
| | 39 | /* */ |
| | 40 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| | 41 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| | 42 | /* messages during execution. */ |
| | 43 | /* */ |
| | 44 | #undef FT_COMPONENT |
| | 45 | #define FT_COMPONENT trace_ttdriver |
| | 46 | |
| | 47 | |
| | 48 | /*************************************************************************/ |
| | 49 | /*************************************************************************/ |
| | 50 | /*************************************************************************/ |
| | 51 | /**** ****/ |
| | 52 | /**** ****/ |
| | 53 | /**** F A C E S ****/ |
| | 54 | /**** ****/ |
| | 55 | /**** ****/ |
| | 56 | /*************************************************************************/ |
| | 57 | /*************************************************************************/ |
| | 58 | /*************************************************************************/ |
| | 59 | |
| | 60 | |
| | 61 | #undef PAIR_TAG |
| | 62 | #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ |
| | 63 | (FT_ULong)right ) |
| | 64 | |
| | 65 | |
| | 66 | /*************************************************************************/ |
| | 67 | /* */ |
| | 68 | /* <Function> */ |
| | 69 | /* Get_Kerning */ |
| | 70 | /* */ |
| | 71 | /* <Description> */ |
| | 72 | /* A driver method used to return the kerning vector between two */ |
| | 73 | /* glyphs of the same face. */ |
| | 74 | /* */ |
| | 75 | /* <Input> */ |
| | 76 | /* face :: A handle to the source face object. */ |
| | 77 | /* */ |
| | 78 | /* left_glyph :: The index of the left glyph in the kern pair. */ |
| | 79 | /* */ |
| | 80 | /* right_glyph :: The index of the right glyph in the kern pair. */ |
| | 81 | /* */ |
| | 82 | /* <Output> */ |
| | 83 | /* kerning :: The kerning vector. This is in font units for */ |
| | 84 | /* scalable formats, and in pixels for fixed-sizes */ |
| | 85 | /* formats. */ |
| | 86 | /* */ |
| | 87 | /* <Return> */ |
| | 88 | /* FreeType error code. 0 means success. */ |
| | 89 | /* */ |
| | 90 | /* <Note> */ |
| | 91 | /* Only horizontal layouts (left-to-right & right-to-left) are */ |
| | 92 | /* supported by this function. Other layouts, or more sophisticated */ |
| | 93 | /* kernings, are out of scope of this method (the basic driver */ |
| | 94 | /* interface is meant to be simple). */ |
| | 95 | /* */ |
| | 96 | /* They can be implemented by format-specific interfaces. */ |
| | 97 | /* */ |
| | 98 | static |
| | 99 | FT_Error Get_Kerning( TT_Face face, |
| | 100 | FT_UInt left_glyph, |
| | 101 | FT_UInt right_glyph, |
| | 102 | FT_Vector* kerning ) |
| | 103 | { |
| | 104 | TT_Kern_0_Pair* pair; |
| | 105 | |
| | 106 | |
| | 107 | if ( !face ) |
| | 108 | return TT_Err_Invalid_Face_Handle; |
| | 109 | |
| | 110 | kerning->x = 0; |
| | 111 | kerning->y = 0; |
| | 112 | |
| | 113 | if ( face->kern_pairs ) |
| | 114 | { |
| | 115 | /* there are some kerning pairs in this font file! */ |
| | 116 | FT_ULong search_tag = PAIR_TAG( left_glyph, right_glyph ); |
| | 117 | FT_Long left, right; |
| | 118 | |
| | 119 | |
| | 120 | left = 0; |
| | 121 | right = face->num_kern_pairs - 1; |
| | 122 | |
| | 123 | while ( left <= right ) |
| | 124 | { |
| | 125 | FT_Int middle = left + ( ( right - left ) >> 1 ); |
| | 126 | FT_ULong cur_pair; |
| | 127 | |
| | 128 | |
| | 129 | pair = face->kern_pairs + middle; |
| | 130 | cur_pair = PAIR_TAG( pair->left, pair->right ); |
| | 131 | |
| | 132 | if ( cur_pair == search_tag ) |
| | 133 | goto Found; |
| | 134 | |
| | 135 | if ( cur_pair < search_tag ) |
| | 136 | left = middle + 1; |
| | 137 | else |
| | 138 | right = middle - 1; |
| | 139 | } |
| | 140 | } |
| | 141 | |
| | 142 | Exit: |
| | 143 | return TT_Err_Ok; |
| | 144 | |
| | 145 | Found: |
| | 146 | kerning->x = pair->value; |
| | 147 | goto Exit; |
| | 148 | } |
| | 149 | |
| | 150 | |
| | 151 | #undef PAIR_TAG |
| | 152 | |
| | 153 | |
| | 154 | /*************************************************************************/ |
| | 155 | /*************************************************************************/ |
| | 156 | /*************************************************************************/ |
| | 157 | /**** ****/ |
| | 158 | /**** ****/ |
| | 159 | /**** S I Z E S ****/ |
| | 160 | /**** ****/ |
| | 161 | /**** ****/ |
| | 162 | /*************************************************************************/ |
| | 163 | /*************************************************************************/ |
| | 164 | /*************************************************************************/ |
| | 165 | |
| | 166 | |
| | 167 | /*************************************************************************/ |
| | 168 | /* */ |
| | 169 | /* <Function> */ |
| | 170 | /* Set_Char_Sizes */ |
| | 171 | /* */ |
| | 172 | /* <Description> */ |
| | 173 | /* A driver method used to reset a size's character sizes (horizontal */ |
| | 174 | /* and vertical) expressed in fractional points. */ |
| | 175 | /* */ |
| | 176 | /* <Input> */ |
| | 177 | /* char_width :: The character width expressed in 26.6 */ |
| | 178 | /* fractional points. */ |
| | 179 | /* */ |
| | 180 | /* char_height :: The character height expressed in 26.6 */ |
| | 181 | /* fractional points. */ |
| | 182 | /* */ |
| | 183 | /* horz_resolution :: The horizontal resolution of the output device. */ |
| | 184 | /* */ |
| | 185 | /* vert_resolution :: The vertical resolution of the output device. */ |
| | 186 | /* */ |
| | 187 | /* <InOut> */ |
| | 188 | /* size :: A handle to the target size object. */ |
| | 189 | /* */ |
| | 190 | /* <Return> */ |
| | 191 | /* FreeType error code. 0 means success. */ |
| | 192 | /* */ |
| | 193 | static |
| | 194 | FT_Error Set_Char_Sizes( TT_Size size, |
| | 195 | FT_F26Dot6 char_width, |
| | 196 | FT_F26Dot6 char_height, |
| | 197 | FT_UInt horz_resolution, |
| | 198 | FT_UInt vert_resolution ) |
| | 199 | { |
| | 200 | FT_Size_Metrics* metrics = &size->root.metrics; |
| | 201 | TT_Face face = (TT_Face)size->root.face; |
| | 202 | FT_Long dim_x, dim_y; |
| | 203 | |
| | 204 | |
| | 205 | /* This bit flag, when set, indicates that the pixel size must be */ |
| | 206 | /* truncated to an integer. Nearly all TrueType fonts have this */ |
| | 207 | /* bit set, as hinting won't work really well otherwise. */ |
| | 208 | /* */ |
| | 209 | /* However, for those rare fonts who do not set it, we override */ |
| | 210 | /* the default computations performed by the base layer. I */ |
| | 211 | /* really don't know whether this is useful, but hey, that's the */ |
| | 212 | /* spec :-) */ |
| | 213 | /* */ |
| | 214 | if ( ( face->header.Flags & 8 ) == 0 ) |
| | 215 | { |
| | 216 | /* Compute pixel sizes in 26.6 units */ |
| | 217 | dim_x = ( char_width * horz_resolution ) / 72; |
| | 218 | dim_y = ( char_height * vert_resolution ) / 72; |
| | 219 | |
| | 220 | metrics->x_scale = FT_DivFix( dim_x, face->root.units_per_EM ); |
| | 221 | metrics->y_scale = FT_DivFix( dim_y, face->root.units_per_EM ); |
| | 222 | |
| | 223 | metrics->x_ppem = (FT_UShort)( dim_x >> 6 ); |
| | 224 | metrics->y_ppem = (FT_UShort)( dim_y >> 6 ); |
| | 225 | } |
| | 226 | |
| | 227 | size->ttmetrics.valid = FALSE; |
| | 228 | |
| | 229 | return TT_Reset_Size( size ); |
| | 230 | } |
| | 231 | |
| | 232 | |
| | 233 | /*************************************************************************/ |
| | 234 | /* */ |
| | 235 | /* <Function> */ |
| | 236 | /* Set_Pixel_Sizes */ |
| | 237 | /* */ |
| | 238 | /* <Description> */ |
| | 239 | /* A driver method used to reset a size's character sizes (horizontal */ |
| | 240 | /* and vertical) expressed in integer pixels. */ |
| | 241 | /* */ |
| | 242 | /* <Input> */ |
| | 243 | /* pixel_width :: The character width expressed in integer pixels. */ |
| | 244 | /* */ |
| | 245 | /* pixel_height :: The character height expressed in integer pixels. */ |
| | 246 | /* */ |
| | 247 | /* <InOut> */ |
| | 248 | /* size :: A handle to the target size object. */ |
| | 249 | /* */ |
| | 250 | /* <Return> */ |
| | 251 | /* FreeType error code. 0 means success. */ |
| | 252 | /* */ |
| | 253 | static |
| | 254 | FT_Error Set_Pixel_Sizes( TT_Size size, |
| | 255 | FT_UInt pixel_width, |
| | 256 | FT_UInt pixel_height ) |
| | 257 | { |
| | 258 | FT_UNUSED( pixel_width ); |
| | 259 | FT_UNUSED( pixel_height ); |
| | 260 | |
| | 261 | /* many things have been pre-computed by the base layer */ |
| | 262 | |
| | 263 | size->ttmetrics.valid = FALSE; |
| | 264 | |
| | 265 | return TT_Reset_Size( size ); |
| | 266 | } |
| | 267 | |
| | 268 | |
| | 269 | /*************************************************************************/ |
| | 270 | /* */ |
| | 271 | /* <Function> */ |
| | 272 | /* Load_Glyph */ |
| | 273 | /* */ |
| | 274 | /* <Description> */ |
| | 275 | /* A driver method used to load a glyph within a given glyph slot. */ |
| | 276 | /* */ |
| | 277 | /* <Input> */ |
| | 278 | /* slot :: A handle to the target slot object where the glyph */ |
| | 279 | /* will be loaded. */ |
| | 280 | /* */ |
| | 281 | /* size :: A handle to the source face size at which the glyph */ |
| | 282 | /* must be scaled, loaded, etc. */ |
| | 283 | /* */ |
| | 284 | /* glyph_index :: The index of the glyph in the font file. */ |
| | 285 | /* */ |
| | 286 | /* load_flags :: A flag indicating what to load for this glyph. The */ |
| | 287 | /* FTLOAD_??? constants can be used to control the */ |
| | 288 | /* glyph loading process (e.g., whether the outline */ |
| | 289 | /* should be scaled, whether to load bitmaps or not, */ |
| | 290 | /* whether to hint the outline, etc). */ |
| | 291 | /* */ |
| | 292 | /* <Return> */ |
| | 293 | /* FreeType error code. 0 means success. */ |
| | 294 | /* */ |
| | 295 | static |
| | 296 | FT_Error Load_Glyph( TT_GlyphSlot slot, |
| | 297 | TT_Size size, |
| | 298 | FT_UShort glyph_index, |
| | 299 | FT_UInt load_flags ) |
| | 300 | { |
| | 301 | FT_Error error; |
| | 302 | |
| | 303 | |
| | 304 | if ( !slot ) |
| | 305 | return TT_Err_Invalid_Glyph_Handle; |
| | 306 | |
| | 307 | /* check whether we want a scaled outline or bitmap */ |
| | 308 | if ( !size ) |
| | 309 | load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; |
| | 310 | |
| | 311 | if ( load_flags & FT_LOAD_NO_SCALE ) |
| | 312 | size = NULL; |
| | 313 | |
| | 314 | /* reset the size object if necessary */ |
| | 315 | if ( size ) |
| | 316 | { |
| | 317 | /* these two object must have the same parent */ |
| | 318 | if ( size->root.face != slot->face ) |
| | 319 | return TT_Err_Invalid_Face_Handle; |
| | 320 | |
| | 321 | if ( !size->ttmetrics.valid ) |
| | 322 | { |
| | 323 | if ( FT_SET_ERROR( TT_Reset_Size( size ) ) ) |
| | 324 | return error; |
| | 325 | } |
| | 326 | } |
| | 327 | |
| | 328 | /* now load the glyph outline if necessary */ |
| | 329 | error = TT_Load_Glyph( size, slot, glyph_index, load_flags ); |
| | 330 | |
| | 331 | /* force drop-out mode to 2 - irrelevant now */ |
| | 332 | /* slot->outline.dropout_mode = 2; */ |
| | 333 | |
| | 334 | return error; |
| | 335 | } |
| | 336 | |
| | 337 | |
| | 338 | /*************************************************************************/ |
| | 339 | /*************************************************************************/ |
| | 340 | /*************************************************************************/ |
| | 341 | /**** ****/ |
| | 342 | /**** ****/ |
| | 343 | /**** C H A R A C T E R M A P P I N G S ****/ |
| | 344 | /**** ****/ |
| | 345 | /**** ****/ |
| | 346 | /*************************************************************************/ |
| | 347 | /*************************************************************************/ |
| | 348 | /*************************************************************************/ |
| | 349 | |
| | 350 | /*************************************************************************/ |
| | 351 | /* */ |
| | 352 | /* <Function> */ |
| | 353 | /* Get_Char_Index */ |
| | 354 | /* */ |
| | 355 | /* <Description> */ |
| | 356 | /* Uses a charmap to return a given character code's glyph index. */ |
| | 357 | /* */ |
| | 358 | /* <Input> */ |
| | 359 | /* charmap :: A handle to the source charmap object. */ |
| | 360 | /* charcode :: The character code. */ |
| | 361 | /* */ |
| | 362 | /* <Return> */ |
| | 363 | /* Glyph index. 0 means `undefined character code'. */ |
| | 364 | /* */ |
| | 365 | static |
| | 366 | FT_UInt Get_Char_Index( TT_CharMap charmap, |
| | 367 | FT_Long charcode ) |
| | 368 | { |
| | 369 | FT_Error error; |
| | 370 | TT_Face face; |
| | 371 | TT_CMapTable* cmap; |
| | 372 | |
| | 373 | |
| | 374 | cmap = &charmap->cmap; |
| | 375 | face = (TT_Face)charmap->root.face; |
| | 376 | |
| | 377 | /* Load table if needed */ |
| | 378 | if ( !cmap->loaded ) |
| | 379 | { |
| | 380 | SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt; |
| | 381 | |
| | 382 | |
| | 383 | error = sfnt->load_charmap( face, cmap, face->root.stream ); |
| | 384 | if ( error ) |
| | 385 | return 0; |
| | 386 | |
| | 387 | cmap->loaded = TRUE; |
| | 388 | } |
| | 389 | |
| | 390 | if ( cmap->get_index ) |
| | 391 | return cmap->get_index( cmap, charcode ); |
| | 392 | else |
| | 393 | return 0; |
| | 394 | } |
| | 395 | |
| | 396 | |
| | 397 | /*************************************************************************/ |
| | 398 | /*************************************************************************/ |
| | 399 | /*************************************************************************/ |
| | 400 | /**** ****/ |
| | 401 | /**** ****/ |
| | 402 | /**** D R I V E R I N T E R F A C E ****/ |
| | 403 | /**** ****/ |
| | 404 | /**** ****/ |
| | 405 | /*************************************************************************/ |
| | 406 | /*************************************************************************/ |
| | 407 | /*************************************************************************/ |
| | 408 | |
| | 409 | |
| | 410 | static |
| | 411 | FT_Module_Interface tt_get_interface( TT_Driver driver, |
| | 412 | const char* interface ) |
| | 413 | { |
| | 414 | FT_Module sfntd = FT_Get_Module( driver->root.root.library, |
| | 415 | "sfnt" ); |
| | 416 | SFNT_Interface* sfnt; |
| | 417 | |
| | 418 | |
| | 419 | /* only return the default interface from the SFNT module */ |
| | 420 | if ( sfntd ) |
| | 421 | { |
| | 422 | sfnt = (SFNT_Interface*)( sfntd->clazz->module_interface ); |
| | 423 | if ( sfnt ) |
| | 424 | return sfnt->get_interface( FT_MODULE( driver ), interface ); |
| | 425 | } |
| | 426 | |
| | 427 | return 0; |
| | 428 | } |
| | 429 | |
| | 430 | |
| | 431 | /* The FT_DriverInterface structure is defined in ftdriver.h. */ |
| | 432 | |
| | 433 | const FT_Driver_Class tt_driver_class = |
| | 434 | { |
| | 435 | { |
| | 436 | ft_module_font_driver | |
| | 437 | ft_module_driver_scalable | |
| | 438 | #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| | 439 | ft_module_driver_has_hinter, |
| | 440 | #else |
| | 441 | 0, |
| | 442 | #endif |
| | 443 | |
| | 444 | sizeof ( TT_DriverRec ), |
| | 445 | |
| | 446 | "truetype", /* driver name */ |
| | 447 | 0x10000L, /* driver version == 1.0 */ |
| | 448 | 0x20000L, /* driver requires FreeType 2.0 or above */ |
| | 449 | |
| | 450 | (void*)0, /* driver specific interface */ |
| | 451 | |
| | 452 | (FT_Module_Constructor)TT_Init_Driver, |
| | 453 | (FT_Module_Destructor) TT_Done_Driver, |
| | 454 | (FT_Module_Requester) tt_get_interface, |
| | 455 | }, |
| | 456 | |
| | 457 | sizeof ( TT_FaceRec ), |
| | 458 | sizeof ( TT_SizeRec ), |
| | 459 | sizeof ( FT_GlyphSlotRec ), |
| | 460 | |
| | 461 | |
| | 462 | (FTDriver_initFace) TT_Init_Face, |
| | 463 | (FTDriver_doneFace) TT_Done_Face, |
| | 464 | (FTDriver_initSize) TT_Init_Size, |
| | 465 | (FTDriver_doneSize) TT_Done_Size, |
| | 466 | (FTDriver_initGlyphSlot)0, |
| | 467 | (FTDriver_doneGlyphSlot)0, |
| | 468 | |
| | 469 | (FTDriver_setCharSizes) Set_Char_Sizes, |
| | 470 | (FTDriver_setPixelSizes)Set_Pixel_Sizes, |
| | 471 | (FTDriver_loadGlyph) Load_Glyph, |
| | 472 | (FTDriver_getCharIndex) Get_Char_Index, |
| | 473 | |
| | 474 | (FTDriver_getKerning) Get_Kerning, |
| | 475 | (FTDriver_attachFile) 0, |
| | 476 | (FTDriver_getAdvances) 0 |
| | 477 | }; |
| | 478 | |
| | 479 | |
| | 480 | #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS |
| | 481 | |
| | 482 | |
| | 483 | /*************************************************************************/ |
| | 484 | /* */ |
| | 485 | /* <Function> */ |
| | 486 | /* getDriverInterface */ |
| | 487 | /* */ |
| | 488 | /* <Description> */ |
| | 489 | /* This function is used when compiling the TrueType driver as a */ |
| | 490 | /* shared library (`.DLL' or `.so'). It will be used by the */ |
| | 491 | /* high-level library of FreeType to retrieve the address of the */ |
| | 492 | /* driver's generic interface. */ |
| | 493 | /* */ |
| | 494 | /* It shouldn't be implemented in a static build, as each driver must */ |
| | 495 | /* have the same function as an exported entry point. */ |
| | 496 | /* */ |
| | 497 | /* <Return> */ |
| | 498 | /* The address of the TrueType's driver generic interface. The */ |
| | 499 | /* format-specific interface can then be retrieved through the method */ |
| | 500 | /* interface->get_format_interface. */ |
| | 501 | /* */ |
| | 502 | EXPORT_FUNC( const FT_Driver_Class* ) getDriverClass( void ) |
| | 503 | { |
| | 504 | return &tt_driver_class; |
| | 505 | } |
| | 506 | |
| | 507 | |
| | 508 | #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */ |
| | 509 | |
| | 510 | |
| | 511 | /* END */ |
projects / wxWidgets.git / blame_incremental