1 /***************************************************************************/ 2 /* */ 3 /* ttdriver.c */ 4 /* */ 5 /* TrueType font driver implementation (body). */ 6 /* */ 7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 */ 8 /* 2010 by */ 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 #include <ft2build.h> 21 #include FT_INTERNAL_DEBUG_H 22 #include FT_INTERNAL_STREAM_H 23 #include FT_INTERNAL_SFNT_H 24 #include FT_SERVICE_XFREE86_NAME_H 25 26 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 27 #include FT_MULTIPLE_MASTERS_H 28 #include FT_SERVICE_MULTIPLE_MASTERS_H 29 #endif 30 31 #include FT_SERVICE_TRUETYPE_ENGINE_H 32 #include FT_SERVICE_TRUETYPE_GLYF_H 33 34 #include "ttdriver.h" 35 #include "ttgload.h" 36 #include "ttpload.h" 37 38 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 39 #include "ttgxvar.h" 40 #endif 41 42 #include "tterrors.h" 43 44 #include "ttpic.h" 45 46 /*************************************************************************/ 47 /* */ 48 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 49 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 50 /* messages during execution. */ 51 /* */ 52 #undef FT_COMPONENT 53 #define FT_COMPONENT trace_ttdriver 54 55 56 /*************************************************************************/ 57 /*************************************************************************/ 58 /*************************************************************************/ 59 /**** ****/ 60 /**** ****/ 61 /**** F A C E S ****/ 62 /**** ****/ 63 /**** ****/ 64 /*************************************************************************/ 65 /*************************************************************************/ 66 /*************************************************************************/ 67 68 69 #undef PAIR_TAG 70 #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ 71 (FT_ULong)right ) 72 73 74 /*************************************************************************/ 75 /* */ 76 /* <Function> */ 77 /* tt_get_kerning */ 78 /* */ 79 /* <Description> */ 80 /* A driver method used to return the kerning vector between two */ 81 /* glyphs of the same face. */ 82 /* */ 83 /* <Input> */ 84 /* face :: A handle to the source face object. */ 85 /* */ 86 /* left_glyph :: The index of the left glyph in the kern pair. */ 87 /* */ 88 /* right_glyph :: The index of the right glyph in the kern pair. */ 89 /* */ 90 /* <Output> */ 91 /* kerning :: The kerning vector. This is in font units for */ 92 /* scalable formats, and in pixels for fixed-sizes */ 93 /* formats. */ 94 /* */ 95 /* <Return> */ 96 /* FreeType error code. 0 means success. */ 97 /* */ 98 /* <Note> */ 99 /* Only horizontal layouts (left-to-right & right-to-left) are */ 100 /* supported by this function. Other layouts, or more sophisticated */ 101 /* kernings, are out of scope of this method (the basic driver */ 102 /* interface is meant to be simple). */ 103 /* */ 104 /* They can be implemented by format-specific interfaces. */ 105 /* */ 106 static FT_Error 107 tt_get_kerning( FT_Face ttface, /* TT_Face */ 108 FT_UInt left_glyph, 109 FT_UInt right_glyph, 110 FT_Vector* kerning ) 111 { 112 TT_Face face = (TT_Face)ttface; 113 SFNT_Service sfnt = (SFNT_Service)face->sfnt; 114 115 116 kerning->x = 0; 117 kerning->y = 0; 118 119 if ( sfnt ) 120 kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph ); 121 122 return 0; 123 } 124 125 126 #undef PAIR_TAG 127 128 129 static FT_Error 130 tt_get_advances( FT_Face ttface, 131 FT_UInt start, 132 FT_UInt count, 133 FT_Int32 flags, 134 FT_Fixed *advances ) 135 { 136 FT_UInt nn; 137 TT_Face face = (TT_Face) ttface; 138 FT_Bool check = FT_BOOL( 139 !( flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) ); 140 141 142 /* XXX: TODO: check for sbits */ 143 144 if ( flags & FT_LOAD_VERTICAL_LAYOUT ) 145 { 146 for ( nn = 0; nn < count; nn++ ) 147 { 148 FT_Short tsb; 149 FT_UShort ah; 150 151 152 TT_Get_VMetrics( face, start + nn, check, &tsb, &ah ); 153 advances[nn] = ah; 154 } 155 } 156 else 157 { 158 for ( nn = 0; nn < count; nn++ ) 159 { 160 FT_Short lsb; 161 FT_UShort aw; 162 163 164 TT_Get_HMetrics( face, start + nn, check, &lsb, &aw ); 165 advances[nn] = aw; 166 } 167 } 168 169 return TT_Err_Ok; 170 } 171 172 /*************************************************************************/ 173 /*************************************************************************/ 174 /*************************************************************************/ 175 /**** ****/ 176 /**** ****/ 177 /**** S I Z E S ****/ 178 /**** ****/ 179 /**** ****/ 180 /*************************************************************************/ 181 /*************************************************************************/ 182 /*************************************************************************/ 183 184 185 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 186 187 static FT_Error 188 tt_size_select( FT_Size size, 189 FT_ULong strike_index ) 190 { 191 TT_Face ttface = (TT_Face)size->face; 192 TT_Size ttsize = (TT_Size)size; 193 FT_Error error = TT_Err_Ok; 194 195 196 ttsize->strike_index = strike_index; 197 198 if ( FT_IS_SCALABLE( size->face ) ) 199 { 200 /* use the scaled metrics, even when tt_size_reset fails */ 201 FT_Select_Metrics( size->face, strike_index ); 202 203 tt_size_reset( ttsize ); 204 } 205 else 206 { 207 SFNT_Service sfnt = (SFNT_Service) ttface->sfnt; 208 FT_Size_Metrics* metrics = &size->metrics; 209 210 211 error = sfnt->load_strike_metrics( ttface, strike_index, metrics ); 212 if ( error ) 213 ttsize->strike_index = 0xFFFFFFFFUL; 214 } 215 216 return error; 217 } 218 219 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 220 221 222 static FT_Error 223 tt_size_request( FT_Size size, 224 FT_Size_Request req ) 225 { 226 TT_Size ttsize = (TT_Size)size; 227 FT_Error error = TT_Err_Ok; 228 229 230 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 231 232 if ( FT_HAS_FIXED_SIZES( size->face ) ) 233 { 234 TT_Face ttface = (TT_Face)size->face; 235 SFNT_Service sfnt = (SFNT_Service) ttface->sfnt; 236 FT_ULong strike_index; 237 238 239 error = sfnt->set_sbit_strike( ttface, req, &strike_index ); 240 241 if ( error ) 242 ttsize->strike_index = 0xFFFFFFFFUL; 243 else 244 return tt_size_select( size, strike_index ); 245 } 246 247 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 248 249 FT_Request_Metrics( size->face, req ); 250 251 if ( FT_IS_SCALABLE( size->face ) ) 252 error = tt_size_reset( ttsize ); 253 254 return error; 255 } 256 257 258 /*************************************************************************/ 259 /* */ 260 /* <Function> */ 261 /* Load_Glyph */ 262 /* */ 263 /* <Description> */ 264 /* A driver method used to load a glyph within a given glyph slot. */ 265 /* */ 266 /* <Input> */ 267 /* slot :: A handle to the target slot object where the glyph */ 268 /* will be loaded. */ 269 /* */ 270 /* size :: A handle to the source face size at which the glyph */ 271 /* must be scaled, loaded, etc. */ 272 /* */ 273 /* glyph_index :: The index of the glyph in the font file. */ 274 /* */ 275 /* load_flags :: A flag indicating what to load for this glyph. The */ 276 /* FT_LOAD_XXX constants can be used to control the */ 277 /* glyph loading process (e.g., whether the outline */ 278 /* should be scaled, whether to load bitmaps or not, */ 279 /* whether to hint the outline, etc). */ 280 /* */ 281 /* <Return> */ 282 /* FreeType error code. 0 means success. */ 283 /* */ 284 static FT_Error 285 Load_Glyph( FT_GlyphSlot ttslot, /* TT_GlyphSlot */ 286 FT_Size ttsize, /* TT_Size */ 287 FT_UInt glyph_index, 288 FT_Int32 load_flags ) 289 { 290 TT_GlyphSlot slot = (TT_GlyphSlot)ttslot; 291 TT_Size size = (TT_Size)ttsize; 292 FT_Face face = ttslot->face; 293 FT_Error error; 294 295 296 if ( !slot ) 297 return TT_Err_Invalid_Slot_Handle; 298 299 if ( !size ) 300 return TT_Err_Invalid_Size_Handle; 301 302 if ( !face ) 303 return TT_Err_Invalid_Argument; 304 305 #ifdef FT_CONFIG_OPTION_INCREMENTAL 306 if ( glyph_index >= (FT_UInt)face->num_glyphs && 307 !face->internal->incremental_interface ) 308 #else 309 if ( glyph_index >= (FT_UInt)face->num_glyphs ) 310 #endif 311 return TT_Err_Invalid_Argument; 312 313 if ( load_flags & FT_LOAD_NO_HINTING ) 314 { 315 /* both FT_LOAD_NO_HINTING and FT_LOAD_NO_AUTOHINT */ 316 /* are necessary to disable hinting for tricky fonts */ 317 318 if ( FT_IS_TRICKY( face ) ) 319 load_flags &= ~FT_LOAD_NO_HINTING; 320 321 if ( load_flags & FT_LOAD_NO_AUTOHINT ) 322 load_flags |= FT_LOAD_NO_HINTING; 323 } 324 325 if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) ) 326 { 327 load_flags |= FT_LOAD_NO_BITMAP | FT_LOAD_NO_SCALE; 328 329 if ( !FT_IS_TRICKY( face ) ) 330 load_flags |= FT_LOAD_NO_HINTING; 331 } 332 333 /* now load the glyph outline if necessary */ 334 error = TT_Load_Glyph( size, slot, glyph_index, load_flags ); 335 336 /* force drop-out mode to 2 - irrelevant now */ 337 /* slot->outline.dropout_mode = 2; */ 338 339 return error; 340 } 341 342 343 /*************************************************************************/ 344 /*************************************************************************/ 345 /*************************************************************************/ 346 /**** ****/ 347 /**** ****/ 348 /**** D R I V E R I N T E R F A C E ****/ 349 /**** ****/ 350 /**** ****/ 351 /*************************************************************************/ 352 /*************************************************************************/ 353 /*************************************************************************/ 354 355 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 356 FT_DEFINE_SERVICE_MULTIMASTERSREC(tt_service_gx_multi_masters, 357 (FT_Get_MM_Func) NULL, 358 (FT_Set_MM_Design_Func) NULL, 359 (FT_Set_MM_Blend_Func) TT_Set_MM_Blend, 360 (FT_Get_MM_Var_Func) TT_Get_MM_Var, 361 (FT_Set_Var_Design_Func)TT_Set_Var_Design 362 ) 363 #endif 364 365 static const FT_Service_TrueTypeEngineRec tt_service_truetype_engine = 366 { 367 #ifdef TT_USE_BYTECODE_INTERPRETER 368 369 #ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING 370 FT_TRUETYPE_ENGINE_TYPE_UNPATENTED 371 #else 372 FT_TRUETYPE_ENGINE_TYPE_PATENTED 373 #endif 374 375 #else /* !TT_USE_BYTECODE_INTERPRETER */ 376 377 FT_TRUETYPE_ENGINE_TYPE_NONE 378 379 #endif /* TT_USE_BYTECODE_INTERPRETER */ 380 }; 381 382 FT_DEFINE_SERVICE_TTGLYFREC(tt_service_truetype_glyf, 383 (TT_Glyf_GetLocationFunc)tt_face_get_location 384 ) 385 386 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 387 FT_DEFINE_SERVICEDESCREC4(tt_services, 388 FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_TRUETYPE, 389 FT_SERVICE_ID_MULTI_MASTERS, &FT_TT_SERVICE_GX_MULTI_MASTERS_GET, 390 FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine, 391 FT_SERVICE_ID_TT_GLYF, &FT_TT_SERVICE_TRUETYPE_GLYF_GET 392 ) 393 #else 394 FT_DEFINE_SERVICEDESCREC3(tt_services, 395 FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_TRUETYPE, 396 FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine, 397 FT_SERVICE_ID_TT_GLYF, &FT_TT_SERVICE_TRUETYPE_GLYF_GET 398 ) 399 #endif 400 401 FT_CALLBACK_DEF( FT_Module_Interface ) 402 tt_get_interface( FT_Module driver, /* TT_Driver */ 403 const char* tt_interface ) 404 { 405 FT_Module_Interface result; 406 FT_Module sfntd; 407 SFNT_Service sfnt; 408 409 result = ft_service_list_lookup( FT_TT_SERVICES_GET, tt_interface ); 410 if ( result != NULL ) 411 return result; 412 413 if ( !driver ) 414 return NULL; 415 416 /* only return the default interface from the SFNT module */ 417 sfntd = FT_Get_Module( driver->library, "sfnt" ); 418 if ( sfntd ) 419 { 420 sfnt = (SFNT_Service)( sfntd->clazz->module_interface ); 421 if ( sfnt ) 422 return sfnt->get_interface( driver, tt_interface ); 423 } 424 425 return 0; 426 } 427 428 429 /* The FT_DriverInterface structure is defined in ftdriver.h. */ 430 431 #ifdef TT_USE_BYTECODE_INTERPRETER 432 #define TT_HINTER_FLAG FT_MODULE_DRIVER_HAS_HINTER 433 #else 434 #define TT_HINTER_FLAG 0 435 #endif 436 437 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 438 #define TT_SIZE_SELECT tt_size_select 439 #else 440 #define TT_SIZE_SELECT 0 441 #endif 442 443 FT_DEFINE_DRIVER(tt_driver_class, 444 445 446 FT_MODULE_FONT_DRIVER | 447 FT_MODULE_DRIVER_SCALABLE | 448 TT_HINTER_FLAG, 449 450 sizeof ( TT_DriverRec ), 451 452 "truetype", /* driver name */ 453 0x10000L, /* driver version == 1.0 */ 454 0x20000L, /* driver requires FreeType 2.0 or above */ 455 456 (void*)0, /* driver specific interface */ 457 458 tt_driver_init, 459 tt_driver_done, 460 tt_get_interface, 461 462 sizeof ( TT_FaceRec ), 463 sizeof ( TT_SizeRec ), 464 sizeof ( FT_GlyphSlotRec ), 465 466 tt_face_init, 467 tt_face_done, 468 tt_size_init, 469 tt_size_done, 470 tt_slot_init, 471 0, /* FT_Slot_DoneFunc */ 472 473 ft_stub_set_char_sizes, /* FT_CONFIG_OPTION_OLD_INTERNALS */ 474 ft_stub_set_pixel_sizes, /* FT_CONFIG_OPTION_OLD_INTERNALS */ 475 476 Load_Glyph, 477 478 tt_get_kerning, 479 0, /* FT_Face_AttachFunc */ 480 tt_get_advances, 481 482 tt_size_request, 483 TT_SIZE_SELECT 484 ) 485 486 487 /* END */ 488
