1 /***************************************************************************/ 2 /* */ 3 /* ttobjs.c */ 4 /* */ 5 /* Objects manager (body). */ 6 /* */ 7 /* Copyright 1996-2017 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_TRUETYPE_TAGS_H 23 #include FT_INTERNAL_SFNT_H 24 #include FT_TRUETYPE_DRIVER_H 25 26 #include "ttgload.h" 27 #include "ttpload.h" 28 29 #include "tterrors.h" 30 31 #ifdef TT_USE_BYTECODE_INTERPRETER 32 #include "ttinterp.h" 33 #endif 34 35 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 36 #include "ttgxvar.h" 37 #endif 38 39 /*************************************************************************/ 40 /* */ 41 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 42 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 43 /* messages during execution. */ 44 /* */ 45 #undef FT_COMPONENT 46 #define FT_COMPONENT trace_ttobjs 47 48 49 #ifdef TT_USE_BYTECODE_INTERPRETER 50 51 /*************************************************************************/ 52 /* */ 53 /* GLYPH ZONE FUNCTIONS */ 54 /* */ 55 /*************************************************************************/ 56 57 58 /*************************************************************************/ 59 /* */ 60 /* <Function> */ 61 /* tt_glyphzone_done */ 62 /* */ 63 /* <Description> */ 64 /* Deallocate a glyph zone. */ 65 /* */ 66 /* <Input> */ 67 /* zone :: A pointer to the target glyph zone. */ 68 /* */ 69 FT_LOCAL_DEF( void ) 70 tt_glyphzone_done( TT_GlyphZone zone ) 71 { 72 FT_Memory memory = zone->memory; 73 74 75 if ( memory ) 76 { 77 FT_FREE( zone->contours ); 78 FT_FREE( zone->tags ); 79 FT_FREE( zone->cur ); 80 FT_FREE( zone->org ); 81 FT_FREE( zone->orus ); 82 83 zone->max_points = zone->n_points = 0; 84 zone->max_contours = zone->n_contours = 0; 85 zone->memory = NULL; 86 } 87 } 88 89 90 /*************************************************************************/ 91 /* */ 92 /* <Function> */ 93 /* tt_glyphzone_new */ 94 /* */ 95 /* <Description> */ 96 /* Allocate a new glyph zone. */ 97 /* */ 98 /* <Input> */ 99 /* memory :: A handle to the current memory object. */ 100 /* */ 101 /* maxPoints :: The capacity of glyph zone in points. */ 102 /* */ 103 /* maxContours :: The capacity of glyph zone in contours. */ 104 /* */ 105 /* <Output> */ 106 /* zone :: A pointer to the target glyph zone record. */ 107 /* */ 108 /* <Return> */ 109 /* FreeType error code. 0 means success. */ 110 /* */ 111 FT_LOCAL_DEF( FT_Error ) 112 tt_glyphzone_new( FT_Memory memory, 113 FT_UShort maxPoints, 114 FT_Short maxContours, 115 TT_GlyphZone zone ) 116 { 117 FT_Error error; 118 119 120 FT_ZERO( zone ); 121 zone->memory = memory; 122 123 if ( FT_NEW_ARRAY( zone->org, maxPoints ) || 124 FT_NEW_ARRAY( zone->cur, maxPoints ) || 125 FT_NEW_ARRAY( zone->orus, maxPoints ) || 126 FT_NEW_ARRAY( zone->tags, maxPoints ) || 127 FT_NEW_ARRAY( zone->contours, maxContours ) ) 128 { 129 tt_glyphzone_done( zone ); 130 } 131 else 132 { 133 zone->max_points = maxPoints; 134 zone->max_contours = maxContours; 135 } 136 137 return error; 138 } 139 #endif /* TT_USE_BYTECODE_INTERPRETER */ 140 141 142 /* Compare the face with a list of well-known `tricky' fonts. */ 143 /* This list shall be expanded as we find more of them. */ 144 145 static FT_Bool 146 tt_check_trickyness_family( FT_String* name ) 147 { 148 149 #define TRICK_NAMES_MAX_CHARACTERS 19 150 #define TRICK_NAMES_COUNT 9 151 152 static const char trick_names[TRICK_NAMES_COUNT] 153 [TRICK_NAMES_MAX_CHARACTERS + 1] = 154 { 155 "DFKaiSho-SB", /* dfkaisb.ttf */ 156 "DFKaiShu", 157 "DFKai-SB", /* kaiu.ttf */ 158 "HuaTianKaiTi?", /* htkt2.ttf */ 159 "HuaTianSongTi?", /* htst3.ttf */ 160 "Ming(for ISO10646)", /* hkscsiic.ttf & iicore.ttf */ 161 "MingLiU", /* mingliu.ttf & mingliu.ttc */ 162 "PMingLiU", /* mingliu.ttc */ 163 "MingLi43", /* mingli.ttf */ 164 }; 165 166 int nn; 167 168 169 for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ ) 170 if ( ft_strstr( name, trick_names[nn] ) ) 171 return TRUE; 172 173 return FALSE; 174 } 175 176 177 /* XXX: This function should be in the `sfnt' module. */ 178 179 /* Some PDF generators clear the checksums in the TrueType header table. */ 180 /* For example, Quartz ContextPDF clears all entries, or Bullzip PDF */ 181 /* Printer clears the entries for subsetted subtables. We thus have to */ 182 /* recalculate the checksums where necessary. */ 183 184 static FT_UInt32 185 tt_synth_sfnt_checksum( FT_Stream stream, 186 FT_ULong length ) 187 { 188 FT_Error error; 189 FT_UInt32 checksum = 0; 190 FT_UInt i; 191 192 193 if ( FT_FRAME_ENTER( length ) ) 194 return 0; 195 196 for ( ; length > 3; length -= 4 ) 197 checksum += (FT_UInt32)FT_GET_ULONG(); 198 199 for ( i = 3; length > 0; length--, i-- ) 200 checksum += (FT_UInt32)FT_GET_BYTE() << ( i * 8 ); 201 202 FT_FRAME_EXIT(); 203 204 return checksum; 205 } 206 207 208 /* XXX: This function should be in the `sfnt' module. */ 209 210 static FT_ULong 211 tt_get_sfnt_checksum( TT_Face face, 212 FT_UShort i ) 213 { 214 #if 0 /* if we believe the written value, use following part. */ 215 if ( face->dir_tables[i].CheckSum ) 216 return face->dir_tables[i].CheckSum; 217 #endif 218 219 if ( !face->goto_table ) 220 return 0; 221 222 if ( face->goto_table( face, 223 face->dir_tables[i].Tag, 224 face->root.stream, 225 NULL ) ) 226 return 0; 227 228 return (FT_ULong)tt_synth_sfnt_checksum( face->root.stream, 229 face->dir_tables[i].Length ); 230 } 231 232 233 typedef struct tt_sfnt_id_rec_ 234 { 235 FT_ULong CheckSum; 236 FT_ULong Length; 237 238 } tt_sfnt_id_rec; 239 240 241 static FT_Bool 242 tt_check_trickyness_sfnt_ids( TT_Face face ) 243 { 244 #define TRICK_SFNT_IDS_PER_FACE 3 245 #define TRICK_SFNT_IDS_NUM_FACES 18 246 247 static const tt_sfnt_id_rec sfnt_id[TRICK_SFNT_IDS_NUM_FACES] 248 [TRICK_SFNT_IDS_PER_FACE] = { 249 250 #define TRICK_SFNT_ID_cvt 0 251 #define TRICK_SFNT_ID_fpgm 1 252 #define TRICK_SFNT_ID_prep 2 253 254 { /* MingLiU 1995 */ 255 { 0x05BCF058UL, 0x000002E4UL }, /* cvt */ 256 { 0x28233BF1UL, 0x000087C4UL }, /* fpgm */ 257 { 0xA344A1EAUL, 0x000001E1UL } /* prep */ 258 }, 259 { /* MingLiU 1996- */ 260 { 0x05BCF058UL, 0x000002E4UL }, /* cvt */ 261 { 0x28233BF1UL, 0x000087C4UL }, /* fpgm */ 262 { 0xA344A1EBUL, 0x000001E1UL } /* prep */ 263 }, 264 { /* DFKaiShu */ 265 { 0x11E5EAD4UL, 0x00000350UL }, /* cvt */ 266 { 0x5A30CA3BUL, 0x00009063UL }, /* fpgm */ 267 { 0x13A42602UL, 0x0000007EUL } /* prep */ 268 }, 269 { /* DFKaiShu2 */ 270 { 0x11E5EAD4UL, 0x00000350UL }, /* cvt */ 271 { 0xA6E78C01UL, 0x00008998UL }, /* fpgm */ 272 { 0x13A42602UL, 0x0000007EUL } /* prep */ 273 }, 274 { /* HuaTianKaiTi */ 275 { 0xFFFBFFFCUL, 0x00000008UL }, /* cvt */ 276 { 0x9C9E48B8UL, 0x0000BEA2UL }, /* fpgm */ 277 { 0x70020112UL, 0x00000008UL } /* prep */ 278 }, 279 { /* HuaTianSongTi */ 280 { 0xFFFBFFFCUL, 0x00000008UL }, /* cvt */ 281 { 0x0A5A0483UL, 0x00017C39UL }, /* fpgm */ 282 { 0x70020112UL, 0x00000008UL } /* prep */ 283 }, 284 { /* NEC fadpop7.ttf */ 285 { 0x00000000UL, 0x00000000UL }, /* cvt */ 286 { 0x40C92555UL, 0x000000E5UL }, /* fpgm */ 287 { 0xA39B58E3UL, 0x0000117CUL } /* prep */ 288 }, 289 { /* NEC fadrei5.ttf */ 290 { 0x00000000UL, 0x00000000UL }, /* cvt */ 291 { 0x33C41652UL, 0x000000E5UL }, /* fpgm */ 292 { 0x26D6C52AUL, 0x00000F6AUL } /* prep */ 293 }, 294 { /* NEC fangot7.ttf */ 295 { 0x00000000UL, 0x00000000UL }, /* cvt */ 296 { 0x6DB1651DUL, 0x0000019DUL }, /* fpgm */ 297 { 0x6C6E4B03UL, 0x00002492UL } /* prep */ 298 }, 299 { /* NEC fangyo5.ttf */ 300 { 0x00000000UL, 0x00000000UL }, /* cvt */ 301 { 0x40C92555UL, 0x000000E5UL }, /* fpgm */ 302 { 0xDE51FAD0UL, 0x0000117CUL } /* prep */ 303 }, 304 { /* NEC fankyo5.ttf */ 305 { 0x00000000UL, 0x00000000UL }, /* cvt */ 306 { 0x85E47664UL, 0x000000E5UL }, /* fpgm */ 307 { 0xA6C62831UL, 0x00001CAAUL } /* prep */ 308 }, 309 { /* NEC fanrgo5.ttf */ 310 { 0x00000000UL, 0x00000000UL }, /* cvt */ 311 { 0x2D891CFDUL, 0x0000019DUL }, /* fpgm */ 312 { 0xA0604633UL, 0x00001DE8UL } /* prep */ 313 }, 314 { /* NEC fangot5.ttc */ 315 { 0x00000000UL, 0x00000000UL }, /* cvt */ 316 { 0x40AA774CUL, 0x000001CBUL }, /* fpgm */ 317 { 0x9B5CAA96UL, 0x00001F9AUL } /* prep */ 318 }, 319 { /* NEC fanmin3.ttc */ 320 { 0x00000000UL, 0x00000000UL }, /* cvt */ 321 { 0x0D3DE9CBUL, 0x00000141UL }, /* fpgm */ 322 { 0xD4127766UL, 0x00002280UL } /* prep */ 323 }, 324 { /* NEC FA-Gothic, 1996 */ 325 { 0x00000000UL, 0x00000000UL }, /* cvt */ 326 { 0x4A692698UL, 0x000001F0UL }, /* fpgm */ 327 { 0x340D4346UL, 0x00001FCAUL } /* prep */ 328 }, 329 { /* NEC FA-Minchou, 1996 */ 330 { 0x00000000UL, 0x00000000UL }, /* cvt */ 331 { 0xCD34C604UL, 0x00000166UL }, /* fpgm */ 332 { 0x6CF31046UL, 0x000022B0UL } /* prep */ 333 }, 334 { /* NEC FA-RoundGothicB, 1996 */ 335 { 0x00000000UL, 0x00000000UL }, /* cvt */ 336 { 0x5DA75315UL, 0x0000019DUL }, /* fpgm */ 337 { 0x40745A5FUL, 0x000022E0UL } /* prep */ 338 }, 339 { /* NEC FA-RoundGothicM, 1996 */ 340 { 0x00000000UL, 0x00000000UL }, /* cvt */ 341 { 0xF055FC48UL, 0x000001C2UL }, /* fpgm */ 342 { 0x3900DED3UL, 0x00001E18UL } /* prep */ 343 } 344 }; 345 346 FT_ULong checksum; 347 int num_matched_ids[TRICK_SFNT_IDS_NUM_FACES]; 348 FT_Bool has_cvt, has_fpgm, has_prep; 349 FT_UShort i; 350 int j, k; 351 352 353 FT_MEM_SET( num_matched_ids, 0, 354 sizeof ( int ) * TRICK_SFNT_IDS_NUM_FACES ); 355 has_cvt = FALSE; 356 has_fpgm = FALSE; 357 has_prep = FALSE; 358 359 for ( i = 0; i < face->num_tables; i++ ) 360 { 361 checksum = 0; 362 363 switch( face->dir_tables[i].Tag ) 364 { 365 case TTAG_cvt: 366 k = TRICK_SFNT_ID_cvt; 367 has_cvt = TRUE; 368 break; 369 370 case TTAG_fpgm: 371 k = TRICK_SFNT_ID_fpgm; 372 has_fpgm = TRUE; 373 break; 374 375 case TTAG_prep: 376 k = TRICK_SFNT_ID_prep; 377 has_prep = TRUE; 378 break; 379 380 default: 381 continue; 382 } 383 384 for ( j = 0; j < TRICK_SFNT_IDS_NUM_FACES; j++ ) 385 if ( face->dir_tables[i].Length == sfnt_id[j][k].Length ) 386 { 387 if ( !checksum ) 388 checksum = tt_get_sfnt_checksum( face, i ); 389 390 if ( sfnt_id[j][k].CheckSum == checksum ) 391 num_matched_ids[j]++; 392 393 if ( num_matched_ids[j] == TRICK_SFNT_IDS_PER_FACE ) 394 return TRUE; 395 } 396 } 397 398 for ( j = 0; j < TRICK_SFNT_IDS_NUM_FACES; j++ ) 399 { 400 if ( !has_cvt && !sfnt_id[j][TRICK_SFNT_ID_cvt].Length ) 401 num_matched_ids[j]++; 402 if ( !has_fpgm && !sfnt_id[j][TRICK_SFNT_ID_fpgm].Length ) 403 num_matched_ids[j]++; 404 if ( !has_prep && !sfnt_id[j][TRICK_SFNT_ID_prep].Length ) 405 num_matched_ids[j]++; 406 if ( num_matched_ids[j] == TRICK_SFNT_IDS_PER_FACE ) 407 return TRUE; 408 } 409 410 return FALSE; 411 } 412 413 414 static FT_Bool 415 tt_check_trickyness( FT_Face face ) 416 { 417 if ( !face ) 418 return FALSE; 419 420 /* For first, check the face name for quick check. */ 421 if ( face->family_name && 422 tt_check_trickyness_family( face->family_name ) ) 423 return TRUE; 424 425 /* Type42 fonts may lack `name' tables, we thus try to identify */ 426 /* tricky fonts by checking the checksums of Type42-persistent */ 427 /* sfnt tables (`cvt', `fpgm', and `prep'). */ 428 if ( tt_check_trickyness_sfnt_ids( (TT_Face)face ) ) 429 return TRUE; 430 431 return FALSE; 432 } 433 434 435 /* Check whether `.notdef' is the only glyph in the `loca' table. */ 436 static FT_Bool 437 tt_check_single_notdef( FT_Face ttface ) 438 { 439 FT_Bool result = FALSE; 440 441 TT_Face face = (TT_Face)ttface; 442 FT_UInt asize; 443 FT_ULong i; 444 FT_ULong glyph_index = 0; 445 FT_UInt count = 0; 446 447 448 for( i = 0; i < face->num_locations; i++ ) 449 { 450 tt_face_get_location( face, i, &asize ); 451 if ( asize > 0 ) 452 { 453 count += 1; 454 if ( count > 1 ) 455 break; 456 glyph_index = i; 457 } 458 } 459 460 /* Only have a single outline. */ 461 if ( count == 1 ) 462 { 463 if ( glyph_index == 0 ) 464 result = TRUE; 465 else 466 { 467 /* FIXME: Need to test glyphname == .notdef ? */ 468 FT_Error error; 469 char buf[8]; 470 471 472 error = FT_Get_Glyph_Name( ttface, glyph_index, buf, 8 ); 473 if ( !error && 474 buf[0] == '.' && !ft_strncmp( buf, ".notdef", 8 ) ) 475 result = TRUE; 476 } 477 } 478 479 return result; 480 } 481 482 483 /*************************************************************************/ 484 /* */ 485 /* <Function> */ 486 /* tt_face_init */ 487 /* */ 488 /* <Description> */ 489 /* Initialize a given TrueType face object. */ 490 /* */ 491 /* <Input> */ 492 /* stream :: The source font stream. */ 493 /* */ 494 /* face_index :: The index of the TrueType font, if we are opening a */ 495 /* collection, in bits 0-15. The numbered instance */ 496 /* index~+~1 of a GX (sub)font, if applicable, in bits */ 497 /* 16-30. */ 498 /* */ 499 /* num_params :: Number of additional generic parameters. Ignored. */ 500 /* */ 501 /* params :: Additional generic parameters. Ignored. */ 502 /* */ 503 /* <InOut> */ 504 /* face :: The newly built face object. */ 505 /* */ 506 /* <Return> */ 507 /* FreeType error code. 0 means success. */ 508 /* */ 509 FT_LOCAL_DEF( FT_Error ) 510 tt_face_init( FT_Stream stream, 511 FT_Face ttface, /* TT_Face */ 512 FT_Int face_index, 513 FT_Int num_params, 514 FT_Parameter* params ) 515 { 516 FT_Error error; 517 FT_Library library; 518 SFNT_Service sfnt; 519 TT_Face face = (TT_Face)ttface; 520 521 522 FT_TRACE2(( "TTF driver\n" )); 523 524 library = ttface->driver->root.library; 525 526 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); 527 if ( !sfnt ) 528 { 529 FT_ERROR(( "tt_face_init: cannot access `sfnt' module\n" )); 530 error = FT_THROW( Missing_Module ); 531 goto Exit; 532 } 533 534 /* create input stream from resource */ 535 if ( FT_STREAM_SEEK( 0 ) ) 536 goto Exit; 537 538 /* check that we have a valid TrueType file */ 539 FT_TRACE2(( " " )); 540 error = sfnt->init_face( stream, face, face_index, num_params, params ); 541 542 /* Stream may have changed. */ 543 stream = face->root.stream; 544 545 if ( error ) 546 goto Exit; 547 548 /* We must also be able to accept Mac/GX fonts, as well as OT ones. */ 549 /* The 0x00020000 tag is completely undocumented; some fonts from */ 550 /* Arphic made for Chinese Windows 3.1 have this. */ 551 if ( face->format_tag != 0x00010000L && /* MS fonts */ 552 face->format_tag != 0x00020000L && /* CJK fonts for Win 3.1 */ 553 face->format_tag != TTAG_true ) /* Mac fonts */ 554 { 555 FT_TRACE2(( " not a TTF font\n" )); 556 goto Bad_Format; 557 } 558 559 #ifdef TT_USE_BYTECODE_INTERPRETER 560 ttface->face_flags |= FT_FACE_FLAG_HINTER; 561 #endif 562 563 /* If we are performing a simple font format check, exit immediately. */ 564 if ( face_index < 0 ) 565 return FT_Err_Ok; 566 567 /* Load font directory */ 568 error = sfnt->load_face( stream, face, face_index, num_params, params ); 569 if ( error ) 570 goto Exit; 571 572 if ( tt_check_trickyness( ttface ) ) 573 ttface->face_flags |= FT_FACE_FLAG_TRICKY; 574 575 error = tt_face_load_hdmx( face, stream ); 576 if ( error ) 577 goto Exit; 578 579 if ( FT_IS_SCALABLE( ttface ) ) 580 { 581 #ifdef FT_CONFIG_OPTION_INCREMENTAL 582 if ( !ttface->internal->incremental_interface ) 583 #endif 584 { 585 error = tt_face_load_loca( face, stream ); 586 587 /* having a (non-zero) `glyf' table without */ 588 /* a `loca' table is not valid */ 589 if ( face->glyf_len && FT_ERR_EQ( error, Table_Missing ) ) 590 goto Exit; 591 if ( error ) 592 goto Exit; 593 } 594 595 /* `fpgm', `cvt', and `prep' are optional */ 596 error = tt_face_load_cvt( face, stream ); 597 if ( error && FT_ERR_NEQ( error, Table_Missing ) ) 598 goto Exit; 599 600 error = tt_face_load_fpgm( face, stream ); 601 if ( error && FT_ERR_NEQ( error, Table_Missing ) ) 602 goto Exit; 603 604 error = tt_face_load_prep( face, stream ); 605 if ( error && FT_ERR_NEQ( error, Table_Missing ) ) 606 goto Exit; 607 608 /* Check the scalable flag based on `loca'. */ 609 #ifdef FT_CONFIG_OPTION_INCREMENTAL 610 if ( !ttface->internal->incremental_interface ) 611 #endif 612 { 613 if ( ttface->num_fixed_sizes && 614 face->glyph_locations && 615 tt_check_single_notdef( ttface ) ) 616 { 617 FT_TRACE5(( "tt_face_init:" 618 " Only the `.notdef' glyph has an outline.\n" 619 " " 620 " Resetting scalable flag to FALSE.\n" )); 621 622 ttface->face_flags &= ~FT_FACE_FLAG_SCALABLE; 623 } 624 } 625 } 626 627 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 628 629 { 630 FT_Int instance_index = face_index >> 16; 631 632 633 if ( FT_HAS_MULTIPLE_MASTERS( ttface ) && 634 instance_index > 0 ) 635 { 636 error = TT_Get_MM_Var( face, NULL ); 637 if ( error ) 638 goto Exit; 639 640 if ( face->blend->mmvar->namedstyle ) 641 { 642 FT_Memory memory = ttface->memory; 643 644 FT_Var_Named_Style* named_style; 645 FT_String* style_name; 646 647 648 /* in `face_index', the instance index starts with value 1 */ 649 named_style = face->blend->mmvar->namedstyle + instance_index - 1; 650 error = sfnt->get_name( face, 651 (FT_UShort)named_style->strid, 652 &style_name ); 653 if ( error ) 654 goto Exit; 655 656 /* set style name; if already set, replace it */ 657 if ( face->root.style_name ) 658 FT_FREE( face->root.style_name ); 659 face->root.style_name = style_name; 660 661 /* finally, select the named instance */ 662 error = TT_Set_Var_Design( face, 663 face->blend->mmvar->num_axis, 664 named_style->coords ); 665 if ( error ) 666 goto Exit; 667 668 tt_apply_mvar( face ); 669 } 670 } 671 } 672 673 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 674 675 /* initialize standard glyph loading routines */ 676 TT_Init_Glyph_Loading( face ); 677 678 Exit: 679 return error; 680 681 Bad_Format: 682 error = FT_THROW( Unknown_File_Format ); 683 goto Exit; 684 } 685 686 687 /*************************************************************************/ 688 /* */ 689 /* <Function> */ 690 /* tt_face_done */ 691 /* */ 692 /* <Description> */ 693 /* Finalize a given face object. */ 694 /* */ 695 /* <Input> */ 696 /* face :: A pointer to the face object to destroy. */ 697 /* */ 698 FT_LOCAL_DEF( void ) 699 tt_face_done( FT_Face ttface ) /* TT_Face */ 700 { 701 TT_Face face = (TT_Face)ttface; 702 FT_Memory memory; 703 FT_Stream stream; 704 SFNT_Service sfnt; 705 706 707 if ( !face ) 708 return; 709 710 memory = ttface->memory; 711 stream = ttface->stream; 712 sfnt = (SFNT_Service)face->sfnt; 713 714 /* for `extended TrueType formats' (i.e. compressed versions) */ 715 if ( face->extra.finalizer ) 716 face->extra.finalizer( face->extra.data ); 717 718 if ( sfnt ) 719 sfnt->done_face( face ); 720 721 /* freeing the locations table */ 722 tt_face_done_loca( face ); 723 724 tt_face_free_hdmx( face ); 725 726 /* freeing the CVT */ 727 FT_FREE( face->cvt ); 728 face->cvt_size = 0; 729 730 /* freeing the programs */ 731 FT_FRAME_RELEASE( face->font_program ); 732 FT_FRAME_RELEASE( face->cvt_program ); 733 face->font_program_size = 0; 734 face->cvt_program_size = 0; 735 736 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 737 tt_done_blend( face ); 738 face->blend = NULL; 739 #endif 740 } 741 742 743 /*************************************************************************/ 744 /* */ 745 /* SIZE FUNCTIONS */ 746 /* */ 747 /*************************************************************************/ 748 749 #ifdef TT_USE_BYTECODE_INTERPRETER 750 751 /*************************************************************************/ 752 /* */ 753 /* <Function> */ 754 /* tt_size_run_fpgm */ 755 /* */ 756 /* <Description> */ 757 /* Run the font program. */ 758 /* */ 759 /* <Input> */ 760 /* size :: A handle to the size object. */ 761 /* */ 762 /* pedantic :: Set if bytecode execution should be pedantic. */ 763 /* */ 764 /* <Return> */ 765 /* FreeType error code. 0 means success. */ 766 /* */ 767 FT_LOCAL_DEF( FT_Error ) 768 tt_size_run_fpgm( TT_Size size, 769 FT_Bool pedantic ) 770 { 771 TT_Face face = (TT_Face)size->root.face; 772 TT_ExecContext exec; 773 FT_Error error; 774 775 776 exec = size->context; 777 778 error = TT_Load_Context( exec, face, size ); 779 if ( error ) 780 return error; 781 782 exec->callTop = 0; 783 exec->top = 0; 784 785 exec->period = 64; 786 exec->phase = 0; 787 exec->threshold = 0; 788 789 exec->instruction_trap = FALSE; 790 exec->F_dot_P = 0x4000L; 791 792 exec->pedantic_hinting = pedantic; 793 794 { 795 FT_Size_Metrics* metrics = &exec->metrics; 796 TT_Size_Metrics* tt_metrics = &exec->tt_metrics; 797 798 799 metrics->x_ppem = 0; 800 metrics->y_ppem = 0; 801 metrics->x_scale = 0; 802 metrics->y_scale = 0; 803 804 tt_metrics->ppem = 0; 805 tt_metrics->scale = 0; 806 tt_metrics->ratio = 0x10000L; 807 } 808 809 /* allow font program execution */ 810 TT_Set_CodeRange( exec, 811 tt_coderange_font, 812 face->font_program, 813 (FT_Long)face->font_program_size ); 814 815 /* disable CVT and glyph programs coderange */ 816 TT_Clear_CodeRange( exec, tt_coderange_cvt ); 817 TT_Clear_CodeRange( exec, tt_coderange_glyph ); 818 819 if ( face->font_program_size > 0 ) 820 { 821 TT_Goto_CodeRange( exec, tt_coderange_font, 0 ); 822 823 FT_TRACE4(( "Executing `fpgm' table.\n" )); 824 error = face->interpreter( exec ); 825 #ifdef FT_DEBUG_LEVEL_TRACE 826 if ( error ) 827 FT_TRACE4(( " interpretation failed with error code 0x%x\n", 828 error )); 829 #endif 830 } 831 else 832 error = FT_Err_Ok; 833 834 size->bytecode_ready = error; 835 836 if ( !error ) 837 TT_Save_Context( exec, size ); 838 839 return error; 840 } 841 842 843 /*************************************************************************/ 844 /* */ 845 /* <Function> */ 846 /* tt_size_run_prep */ 847 /* */ 848 /* <Description> */ 849 /* Run the control value program. */ 850 /* */ 851 /* <Input> */ 852 /* size :: A handle to the size object. */ 853 /* */ 854 /* pedantic :: Set if bytecode execution should be pedantic. */ 855 /* */ 856 /* <Return> */ 857 /* FreeType error code. 0 means success. */ 858 /* */ 859 FT_LOCAL_DEF( FT_Error ) 860 tt_size_run_prep( TT_Size size, 861 FT_Bool pedantic ) 862 { 863 TT_Face face = (TT_Face)size->root.face; 864 TT_ExecContext exec; 865 FT_Error error; 866 867 868 exec = size->context; 869 870 error = TT_Load_Context( exec, face, size ); 871 if ( error ) 872 return error; 873 874 exec->callTop = 0; 875 exec->top = 0; 876 877 exec->instruction_trap = FALSE; 878 879 exec->pedantic_hinting = pedantic; 880 881 TT_Set_CodeRange( exec, 882 tt_coderange_cvt, 883 face->cvt_program, 884 (FT_Long)face->cvt_program_size ); 885 886 TT_Clear_CodeRange( exec, tt_coderange_glyph ); 887 888 if ( face->cvt_program_size > 0 ) 889 { 890 TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 ); 891 892 FT_TRACE4(( "Executing `prep' table.\n" )); 893 error = face->interpreter( exec ); 894 #ifdef FT_DEBUG_LEVEL_TRACE 895 if ( error ) 896 FT_TRACE4(( " interpretation failed with error code 0x%x\n", 897 error )); 898 #endif 899 } 900 else 901 error = FT_Err_Ok; 902 903 size->cvt_ready = error; 904 905 /* UNDOCUMENTED! The MS rasterizer doesn't allow the following */ 906 /* graphics state variables to be modified by the CVT program. */ 907 908 exec->GS.dualVector.x = 0x4000; 909 exec->GS.dualVector.y = 0; 910 exec->GS.projVector.x = 0x4000; 911 exec->GS.projVector.y = 0x0; 912 exec->GS.freeVector.x = 0x4000; 913 exec->GS.freeVector.y = 0x0; 914 915 exec->GS.rp0 = 0; 916 exec->GS.rp1 = 0; 917 exec->GS.rp2 = 0; 918 919 exec->GS.gep0 = 1; 920 exec->GS.gep1 = 1; 921 exec->GS.gep2 = 1; 922 923 exec->GS.loop = 1; 924 925 /* save as default graphics state */ 926 size->GS = exec->GS; 927 928 TT_Save_Context( exec, size ); 929 930 return error; 931 } 932 933 934 static void 935 tt_size_done_bytecode( FT_Size ftsize ) 936 { 937 TT_Size size = (TT_Size)ftsize; 938 TT_Face face = (TT_Face)ftsize->face; 939 FT_Memory memory = face->root.memory; 940 941 if ( size->context ) 942 { 943 TT_Done_Context( size->context ); 944 size->context = NULL; 945 } 946 947 FT_FREE( size->cvt ); 948 size->cvt_size = 0; 949 950 /* free storage area */ 951 FT_FREE( size->storage ); 952 size->storage_size = 0; 953 954 /* twilight zone */ 955 tt_glyphzone_done( &size->twilight ); 956 957 FT_FREE( size->function_defs ); 958 FT_FREE( size->instruction_defs ); 959 960 size->num_function_defs = 0; 961 size->max_function_defs = 0; 962 size->num_instruction_defs = 0; 963 size->max_instruction_defs = 0; 964 965 size->max_func = 0; 966 size->max_ins = 0; 967 968 size->bytecode_ready = -1; 969 size->cvt_ready = -1; 970 } 971 972 973 /* Initialize bytecode-related fields in the size object. */ 974 /* We do this only if bytecode interpretation is really needed. */ 975 static FT_Error 976 tt_size_init_bytecode( FT_Size ftsize, 977 FT_Bool pedantic ) 978 { 979 FT_Error error; 980 TT_Size size = (TT_Size)ftsize; 981 TT_Face face = (TT_Face)ftsize->face; 982 FT_Memory memory = face->root.memory; 983 984 FT_UShort n_twilight; 985 TT_MaxProfile* maxp = &face->max_profile; 986 987 988 /* clean up bytecode related data */ 989 FT_FREE( size->function_defs ); 990 FT_FREE( size->instruction_defs ); 991 FT_FREE( size->cvt ); 992 FT_FREE( size->storage ); 993 994 if ( size->context ) 995 TT_Done_Context( size->context ); 996 tt_glyphzone_done( &size->twilight ); 997 998 size->bytecode_ready = -1; 999 size->cvt_ready = -1; 1000 1001 size->context = TT_New_Context( (TT_Driver)face->root.driver ); 1002 1003 size->max_function_defs = maxp->maxFunctionDefs; 1004 size->max_instruction_defs = maxp->maxInstructionDefs; 1005 1006 size->num_function_defs = 0; 1007 size->num_instruction_defs = 0; 1008 1009 size->max_func = 0; 1010 size->max_ins = 0; 1011 1012 size->cvt_size = face->cvt_size; 1013 size->storage_size = maxp->maxStorage; 1014 1015 /* Set default metrics */ 1016 { 1017 TT_Size_Metrics* metrics = &size->ttmetrics; 1018 1019 1020 metrics->rotated = FALSE; 1021 metrics->stretched = FALSE; 1022 1023 /* set default engine compensation */ 1024 metrics->compensations[0] = 0; /* gray */ 1025 metrics->compensations[1] = 0; /* black */ 1026 metrics->compensations[2] = 0; /* white */ 1027 metrics->compensations[3] = 0; /* reserved */ 1028 } 1029 1030 /* allocate function defs, instruction defs, cvt, and storage area */ 1031 if ( FT_NEW_ARRAY( size->function_defs, size->max_function_defs ) || 1032 FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) || 1033 FT_NEW_ARRAY( size->cvt, size->cvt_size ) || 1034 FT_NEW_ARRAY( size->storage, size->storage_size ) ) 1035 goto Exit; 1036 1037 /* reserve twilight zone */ 1038 n_twilight = maxp->maxTwilightPoints; 1039 1040 /* there are 4 phantom points (do we need this?) */ 1041 n_twilight += 4; 1042 1043 error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight ); 1044 if ( error ) 1045 goto Exit; 1046 1047 size->twilight.n_points = n_twilight; 1048 1049 size->GS = tt_default_graphics_state; 1050 1051 /* set `face->interpreter' according to the debug hook present */ 1052 { 1053 FT_Library library = face->root.driver->root.library; 1054 1055 1056 face->interpreter = (TT_Interpreter) 1057 library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE]; 1058 if ( !face->interpreter ) 1059 face->interpreter = (TT_Interpreter)TT_RunIns; 1060 } 1061 1062 /* Fine, now run the font program! */ 1063 1064 /* In case of an error while executing `fpgm', we intentionally don't */ 1065 /* clean up immediately bugs in the `fpgm' are so fundamental that */ 1066 /* all following hinting calls should fail. Additionally, `fpgm' is */ 1067 /* to be executed just once; calling it again is completely useless */ 1068 /* and might even lead to extremely slow behaviour if it is malformed */ 1069 /* (containing an infinite loop, for example). */ 1070 error = tt_size_run_fpgm( size, pedantic ); 1071 return error; 1072 1073 Exit: 1074 if ( error ) 1075 tt_size_done_bytecode( ftsize ); 1076 1077 return error; 1078 } 1079 1080 1081 FT_LOCAL_DEF( FT_Error ) 1082 tt_size_ready_bytecode( TT_Size size, 1083 FT_Bool pedantic ) 1084 { 1085 FT_Error error = FT_Err_Ok; 1086 1087 1088 if ( size->bytecode_ready < 0 ) 1089 error = tt_size_init_bytecode( (FT_Size)size, pedantic ); 1090 else 1091 error = size->bytecode_ready; 1092 1093 if ( error ) 1094 goto Exit; 1095 1096 /* rescale CVT when needed */ 1097 if ( size->cvt_ready < 0 ) 1098 { 1099 FT_UInt i; 1100 TT_Face face = (TT_Face)size->root.face; 1101 1102 1103 /* Scale the cvt values to the new ppem. */ 1104 /* We use by default the y ppem to scale the CVT. */ 1105 for ( i = 0; i < size->cvt_size; i++ ) 1106 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 1107 1108 /* all twilight points are originally zero */ 1109 for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ ) 1110 { 1111 size->twilight.org[i].x = 0; 1112 size->twilight.org[i].y = 0; 1113 size->twilight.cur[i].x = 0; 1114 size->twilight.cur[i].y = 0; 1115 } 1116 1117 /* clear storage area */ 1118 for ( i = 0; i < (FT_UInt)size->storage_size; i++ ) 1119 size->storage[i] = 0; 1120 1121 size->GS = tt_default_graphics_state; 1122 1123 error = tt_size_run_prep( size, pedantic ); 1124 } 1125 else 1126 error = size->cvt_ready; 1127 1128 Exit: 1129 return error; 1130 } 1131 1132 #endif /* TT_USE_BYTECODE_INTERPRETER */ 1133 1134 1135 /*************************************************************************/ 1136 /* */ 1137 /* <Function> */ 1138 /* tt_size_init */ 1139 /* */ 1140 /* <Description> */ 1141 /* Initialize a new TrueType size object. */ 1142 /* */ 1143 /* <InOut> */ 1144 /* size :: A handle to the size object. */ 1145 /* */ 1146 /* <Return> */ 1147 /* FreeType error code. 0 means success. */ 1148 /* */ 1149 FT_LOCAL_DEF( FT_Error ) 1150 tt_size_init( FT_Size ttsize ) /* TT_Size */ 1151 { 1152 TT_Size size = (TT_Size)ttsize; 1153 FT_Error error = FT_Err_Ok; 1154 1155 1156 #ifdef TT_USE_BYTECODE_INTERPRETER 1157 size->bytecode_ready = -1; 1158 size->cvt_ready = -1; 1159 #endif 1160 1161 size->ttmetrics.valid = FALSE; 1162 size->strike_index = 0xFFFFFFFFUL; 1163 1164 return error; 1165 } 1166 1167 1168 /*************************************************************************/ 1169 /* */ 1170 /* <Function> */ 1171 /* tt_size_done */ 1172 /* */ 1173 /* <Description> */ 1174 /* The TrueType size object finalizer. */ 1175 /* */ 1176 /* <Input> */ 1177 /* size :: A handle to the target size object. */ 1178 /* */ 1179 FT_LOCAL_DEF( void ) 1180 tt_size_done( FT_Size ttsize ) /* TT_Size */ 1181 { 1182 TT_Size size = (TT_Size)ttsize; 1183 1184 1185 #ifdef TT_USE_BYTECODE_INTERPRETER 1186 tt_size_done_bytecode( ttsize ); 1187 #endif 1188 1189 size->ttmetrics.valid = FALSE; 1190 } 1191 1192 1193 /*************************************************************************/ 1194 /* */ 1195 /* <Function> */ 1196 /* tt_size_reset */ 1197 /* */ 1198 /* <Description> */ 1199 /* Reset a TrueType size when resolutions and character dimensions */ 1200 /* have been changed. */ 1201 /* */ 1202 /* <Input> */ 1203 /* size :: A handle to the target size object. */ 1204 /* */ 1205 /* only_height :: Only recompute ascender, descender, and height. */ 1206 /* */ 1207 FT_LOCAL_DEF( FT_Error ) 1208 tt_size_reset( TT_Size size, 1209 FT_Bool only_height ) 1210 { 1211 TT_Face face; 1212 FT_Size_Metrics* metrics; 1213 1214 1215 face = (TT_Face)size->root.face; 1216 1217 /* nothing to do for CFF2 */ 1218 if ( face->isCFF2 ) 1219 return FT_Err_Ok; 1220 1221 size->ttmetrics.valid = FALSE; 1222 1223 metrics = &size->metrics; 1224 1225 /* copy the result from base layer */ 1226 *metrics = size->root.metrics; 1227 1228 if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 ) 1229 return FT_THROW( Invalid_PPem ); 1230 1231 /* This bit flag, if set, indicates that the ppems must be */ 1232 /* rounded to integers. Nearly all TrueType fonts have this bit */ 1233 /* set, as hinting won't work really well otherwise. */ 1234 /* */ 1235 if ( face->header.Flags & 8 ) 1236 { 1237 metrics->ascender = 1238 FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) ); 1239 metrics->descender = 1240 FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) ); 1241 metrics->height = 1242 FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) ); 1243 } 1244 1245 size->ttmetrics.valid = TRUE; 1246 1247 if ( only_height ) 1248 return FT_Err_Ok; 1249 1250 if ( face->header.Flags & 8 ) 1251 { 1252 metrics->x_scale = FT_DivFix( metrics->x_ppem << 6, 1253 face->root.units_per_EM ); 1254 metrics->y_scale = FT_DivFix( metrics->y_ppem << 6, 1255 face->root.units_per_EM ); 1256 1257 metrics->max_advance = 1258 FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width, 1259 metrics->x_scale ) ); 1260 } 1261 1262 /* compute new transformation */ 1263 if ( metrics->x_ppem >= metrics->y_ppem ) 1264 { 1265 size->ttmetrics.scale = metrics->x_scale; 1266 size->ttmetrics.ppem = metrics->x_ppem; 1267 size->ttmetrics.x_ratio = 0x10000L; 1268 size->ttmetrics.y_ratio = FT_DivFix( metrics->y_ppem, 1269 metrics->x_ppem ); 1270 } 1271 else 1272 { 1273 size->ttmetrics.scale = metrics->y_scale; 1274 size->ttmetrics.ppem = metrics->y_ppem; 1275 size->ttmetrics.x_ratio = FT_DivFix( metrics->x_ppem, 1276 metrics->y_ppem ); 1277 size->ttmetrics.y_ratio = 0x10000L; 1278 } 1279 1280 #ifdef TT_USE_BYTECODE_INTERPRETER 1281 size->cvt_ready = -1; 1282 #endif /* TT_USE_BYTECODE_INTERPRETER */ 1283 1284 return FT_Err_Ok; 1285 } 1286 1287 1288 /*************************************************************************/ 1289 /* */ 1290 /* <Function> */ 1291 /* tt_driver_init */ 1292 /* */ 1293 /* <Description> */ 1294 /* Initialize a given TrueType driver object. */ 1295 /* */ 1296 /* <Input> */ 1297 /* driver :: A handle to the target driver object. */ 1298 /* */ 1299 /* <Return> */ 1300 /* FreeType error code. 0 means success. */ 1301 /* */ 1302 FT_LOCAL_DEF( FT_Error ) 1303 tt_driver_init( FT_Module ttdriver ) /* TT_Driver */ 1304 { 1305 1306 #ifdef TT_USE_BYTECODE_INTERPRETER 1307 1308 TT_Driver driver = (TT_Driver)ttdriver; 1309 1310 driver->interpreter_version = TT_INTERPRETER_VERSION_35; 1311 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 1312 driver->interpreter_version = TT_INTERPRETER_VERSION_38; 1313 #endif 1314 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 1315 driver->interpreter_version = TT_INTERPRETER_VERSION_40; 1316 #endif 1317 1318 #else /* !TT_USE_BYTECODE_INTERPRETER */ 1319 1320 FT_UNUSED( ttdriver ); 1321 1322 #endif /* !TT_USE_BYTECODE_INTERPRETER */ 1323 1324 return FT_Err_Ok; 1325 } 1326 1327 1328 /*************************************************************************/ 1329 /* */ 1330 /* <Function> */ 1331 /* tt_driver_done */ 1332 /* */ 1333 /* <Description> */ 1334 /* Finalize a given TrueType driver. */ 1335 /* */ 1336 /* <Input> */ 1337 /* driver :: A handle to the target TrueType driver. */ 1338 /* */ 1339 FT_LOCAL_DEF( void ) 1340 tt_driver_done( FT_Module ttdriver ) /* TT_Driver */ 1341 { 1342 FT_UNUSED( ttdriver ); 1343 } 1344 1345 1346 /*************************************************************************/ 1347 /* */ 1348 /* <Function> */ 1349 /* tt_slot_init */ 1350 /* */ 1351 /* <Description> */ 1352 /* Initialize a new slot object. */ 1353 /* */ 1354 /* <InOut> */ 1355 /* slot :: A handle to the slot object. */ 1356 /* */ 1357 /* <Return> */ 1358 /* FreeType error code. 0 means success. */ 1359 /* */ 1360 FT_LOCAL_DEF( FT_Error ) 1361 tt_slot_init( FT_GlyphSlot slot ) 1362 { 1363 return FT_GlyphLoader_CreateExtra( slot->internal->loader ); 1364 } 1365 1366 1367 /* END */ 1368
