/src/freetype/src/truetype/ttdriver.c
C | 502 lines | 273 code | 105 blank | 124 comment | 27 complexity | f4b985b912fe931368ca05c943260dfa MD5 | raw file
1/***************************************************************************/ 2/* */ 3/* ttdriver.c */ 4/* */ 5/* TrueType font driver implementation (body). */ 6/* */ 7/* Copyright 1996-2012 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 <ft2build.h> 20#include FT_INTERNAL_DEBUG_H 21#include FT_INTERNAL_STREAM_H 22#include FT_INTERNAL_SFNT_H 23#include FT_SERVICE_XFREE86_NAME_H 24 25#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 26#include FT_MULTIPLE_MASTERS_H 27#include FT_SERVICE_MULTIPLE_MASTERS_H 28#endif 29 30#include FT_SERVICE_TRUETYPE_ENGINE_H 31#include FT_SERVICE_TRUETYPE_GLYF_H 32 33#include "ttdriver.h" 34#include "ttgload.h" 35#include "ttpload.h" 36 37#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 38#include "ttgxvar.h" 39#endif 40 41#include "tterrors.h" 42 43#include "ttpic.h" 44 45 /*************************************************************************/ 46 /* */ 47 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 48 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 49 /* messages during execution. */ 50 /* */ 51#undef FT_COMPONENT 52#define FT_COMPONENT trace_ttdriver 53 54 55 /*************************************************************************/ 56 /*************************************************************************/ 57 /*************************************************************************/ 58 /**** ****/ 59 /**** ****/ 60 /**** F A C E S ****/ 61 /**** ****/ 62 /**** ****/ 63 /*************************************************************************/ 64 /*************************************************************************/ 65 /*************************************************************************/ 66 67 68#undef PAIR_TAG 69#define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ 70 (FT_ULong)right ) 71 72 73 /*************************************************************************/ 74 /* */ 75 /* <Function> */ 76 /* tt_get_kerning */ 77 /* */ 78 /* <Description> */ 79 /* A driver method used to return the kerning vector between two */ 80 /* glyphs of the same face. */ 81 /* */ 82 /* <Input> */ 83 /* face :: A handle to the source face object. */ 84 /* */ 85 /* left_glyph :: The index of the left glyph in the kern pair. */ 86 /* */ 87 /* right_glyph :: The index of the right glyph in the kern pair. */ 88 /* */ 89 /* <Output> */ 90 /* kerning :: The kerning vector. This is in font units for */ 91 /* scalable formats, and in pixels for fixed-sizes */ 92 /* formats. */ 93 /* */ 94 /* <Return> */ 95 /* FreeType error code. 0 means success. */ 96 /* */ 97 /* <Note> */ 98 /* Only horizontal layouts (left-to-right & right-to-left) are */ 99 /* supported by this function. Other layouts, or more sophisticated */ 100 /* kernings, are out of scope of this method (the basic driver */ 101 /* interface is meant to be simple). */ 102 /* */ 103 /* They can be implemented by format-specific interfaces. */ 104 /* */ 105 static FT_Error 106 tt_get_kerning( FT_Face ttface, /* TT_Face */ 107 FT_UInt left_glyph, 108 FT_UInt right_glyph, 109 FT_Vector* kerning ) 110 { 111 TT_Face face = (TT_Face)ttface; 112 SFNT_Service sfnt = (SFNT_Service)face->sfnt; 113 114 115 kerning->x = 0; 116 kerning->y = 0; 117 118 if ( sfnt ) 119 kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph ); 120 121 return 0; 122 } 123 124 125#undef PAIR_TAG 126 127 128 static FT_Error 129 tt_get_advances( FT_Face ttface, 130 FT_UInt start, 131 FT_UInt count, 132 FT_Int32 flags, 133 FT_Fixed *advances ) 134 { 135 FT_UInt nn; 136 TT_Face face = (TT_Face) ttface; 137 138 139 /* XXX: TODO: check for sbits */ 140 141 if ( flags & FT_LOAD_VERTICAL_LAYOUT ) 142 { 143 for ( nn = 0; nn < count; nn++ ) 144 { 145 FT_Short tsb; 146 FT_UShort ah; 147 148 149 TT_Get_VMetrics( face, start + nn, &tsb, &ah ); 150 advances[nn] = ah; 151 } 152 } 153 else 154 { 155 for ( nn = 0; nn < count; nn++ ) 156 { 157 FT_Short lsb; 158 FT_UShort aw; 159 160 161 TT_Get_HMetrics( face, start + nn, &lsb, &aw ); 162 advances[nn] = aw; 163 } 164 } 165 166 return TT_Err_Ok; 167 } 168 169 /*************************************************************************/ 170 /*************************************************************************/ 171 /*************************************************************************/ 172 /**** ****/ 173 /**** ****/ 174 /**** S I Z E S ****/ 175 /**** ****/ 176 /**** ****/ 177 /*************************************************************************/ 178 /*************************************************************************/ 179 /*************************************************************************/ 180 181 182#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 183 184 static FT_Error 185 tt_size_select( FT_Size size, 186 FT_ULong strike_index ) 187 { 188 TT_Face ttface = (TT_Face)size->face; 189 TT_Size ttsize = (TT_Size)size; 190 FT_Error error = TT_Err_Ok; 191 192 193 ttsize->strike_index = strike_index; 194 195 if ( FT_IS_SCALABLE( size->face ) ) 196 { 197 /* use the scaled metrics, even when tt_size_reset fails */ 198 FT_Select_Metrics( size->face, strike_index ); 199 200 tt_size_reset( ttsize ); 201 } 202 else 203 { 204 SFNT_Service sfnt = (SFNT_Service) ttface->sfnt; 205 FT_Size_Metrics* metrics = &size->metrics; 206 207 208 error = sfnt->load_strike_metrics( ttface, strike_index, metrics ); 209 if ( error ) 210 ttsize->strike_index = 0xFFFFFFFFUL; 211 } 212 213 return error; 214 } 215 216#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 217 218 219 static FT_Error 220 tt_size_request( FT_Size size, 221 FT_Size_Request req ) 222 { 223 TT_Size ttsize = (TT_Size)size; 224 FT_Error error = TT_Err_Ok; 225 226 227#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 228 229 if ( FT_HAS_FIXED_SIZES( size->face ) ) 230 { 231 TT_Face ttface = (TT_Face)size->face; 232 SFNT_Service sfnt = (SFNT_Service) ttface->sfnt; 233 FT_ULong strike_index; 234 235 236 error = sfnt->set_sbit_strike( ttface, req, &strike_index ); 237 238 if ( error ) 239 ttsize->strike_index = 0xFFFFFFFFUL; 240 else 241 return tt_size_select( size, strike_index ); 242 } 243 244#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 245 246 FT_Request_Metrics( size->face, req ); 247 248 if ( FT_IS_SCALABLE( size->face ) ) 249 { 250 error = tt_size_reset( ttsize ); 251 ttsize->root.metrics = ttsize->metrics; 252 } 253 254 return error; 255 } 256 257 258 /*************************************************************************/ 259 /* */ 260 /* <Function> */ 261 /* tt_glyph_load */ 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 tt_glyph_load( 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_Library library; 406 FT_Module_Interface result; 407 FT_Module sfntd; 408 SFNT_Service sfnt; 409 410 411 /* FT_TT_SERVICES_GET derefers `library' in PIC mode */ 412#ifdef FT_CONFIG_OPTION_PIC 413 if ( !driver ) 414 return NULL; 415 library = driver->library; 416 if ( !library ) 417 return NULL; 418#endif 419 420 result = ft_service_list_lookup( FT_TT_SERVICES_GET, tt_interface ); 421 if ( result != NULL ) 422 return result; 423 424#ifndef FT_CONFIG_OPTION_PIC 425 if ( !driver ) 426 return NULL; 427 library = driver->library; 428 if ( !library ) 429 return NULL; 430#endif 431 432 /* only return the default interface from the SFNT module */ 433 sfntd = FT_Get_Module( library, "sfnt" ); 434 if ( sfntd ) 435 { 436 sfnt = (SFNT_Service)( sfntd->clazz->module_interface ); 437 if ( sfnt ) 438 return sfnt->get_interface( driver, tt_interface ); 439 } 440 441 return 0; 442 } 443 444 445 /* The FT_DriverInterface structure is defined in ftdriver.h. */ 446 447#ifdef TT_USE_BYTECODE_INTERPRETER 448#define TT_HINTER_FLAG FT_MODULE_DRIVER_HAS_HINTER 449#else 450#define TT_HINTER_FLAG 0 451#endif 452 453#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 454#define TT_SIZE_SELECT tt_size_select 455#else 456#define TT_SIZE_SELECT 0 457#endif 458 459 FT_DEFINE_DRIVER( tt_driver_class, 460 461 FT_MODULE_FONT_DRIVER | 462 FT_MODULE_DRIVER_SCALABLE | 463 TT_HINTER_FLAG, 464 465 sizeof ( TT_DriverRec ), 466 467 "truetype", /* driver name */ 468 0x10000L, /* driver version == 1.0 */ 469 0x20000L, /* driver requires FreeType 2.0 or above */ 470 471 (void*)0, /* driver specific interface */ 472 473 tt_driver_init, 474 tt_driver_done, 475 tt_get_interface, 476 477 sizeof ( TT_FaceRec ), 478 sizeof ( TT_SizeRec ), 479 sizeof ( FT_GlyphSlotRec ), 480 481 tt_face_init, 482 tt_face_done, 483 tt_size_init, 484 tt_size_done, 485 tt_slot_init, 486 0, /* FT_Slot_DoneFunc */ 487 488 ft_stub_set_char_sizes, /* FT_CONFIG_OPTION_OLD_INTERNALS */ 489 ft_stub_set_pixel_sizes, /* FT_CONFIG_OPTION_OLD_INTERNALS */ 490 491 tt_glyph_load, 492 493 tt_get_kerning, 494 0, /* FT_Face_AttachFunc */ 495 tt_get_advances, 496 497 tt_size_request, 498 TT_SIZE_SELECT 499 ) 500 501 502/* END */