1/***************************************************************************/ 2/* */ 3/* sfobjs.c */ 4/* */ 5/* SFNT object management (base). */ 6/* */ 7/* Copyright 1996-2008, 2010-2013 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 "../../include/ft2build.h" 20#include "sfobjs.h" 21#include "ttload.h" 22#include "ttcmap.h" 23#include "ttkern.h" 24#include "../../include/freetype/internal/sfnt.h" 25#include "../../include/freetype/internal/ftdebug.h" 26#include "../../include/freetype/ttnameid.h" 27#include "../../include/freetype/tttags.h" 28#include "../../include/freetype/internal/services/svpscmap.h" 29#include "../../include/freetype/ftsnames.h" 30#include "sferrors.h" 31 32#ifdef TT_CONFIG_OPTION_BDF 33#include "ttbdf.h" 34#endif 35 36 37 /*************************************************************************/ 38 /* */ 39 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 40 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 41 /* messages during execution. */ 42 /* */ 43#undef FT_COMPONENT 44#define FT_COMPONENT trace_sfobjs 45 46 47 48 /* convert a UTF-16 name entry to ASCII */ 49 static FT_String* 50 tt_name_entry_ascii_from_utf16( TT_NameEntry entry, 51 FT_Memory memory ) 52 { 53 FT_String* string = NULL; 54 FT_UInt len, code, n; 55 FT_Byte* read = (FT_Byte*)entry->string; 56 FT_Error error; 57 58 59 len = (FT_UInt)entry->stringLength / 2; 60 61 if ( FT_NEW_ARRAY( string, len + 1 ) ) 62 return NULL; 63 64 for ( n = 0; n < len; n++ ) 65 { 66 code = FT_NEXT_USHORT( read ); 67 68 if ( code == 0 ) 69 break; 70 71 if (code > 255) /*Johnson 2010-10-09, #TESTDOC:0000042_QUT20005_5.pdf.*/ 72 code = code>>8&0x00ff; 73 if ( code < 32 || code > 127 ) 74 code = '?'; 75 76 string[n] = (char)code; 77 } 78 79 string[n] = 0; 80 81 return string; 82 } 83 84 85 /* convert an Apple Roman or symbol name entry to ASCII */ 86 static FT_String* 87 tt_name_entry_ascii_from_other( TT_NameEntry entry, 88 FT_Memory memory ) 89 { 90 FT_String* string = NULL; 91 FT_UInt len, code, n; 92 FT_Byte* read = (FT_Byte*)entry->string; 93 FT_Error error; 94 95 96 len = (FT_UInt)entry->stringLength; 97 98 if ( FT_NEW_ARRAY( string, len + 1 ) ) 99 return NULL; 100 101 for ( n = 0; n < len; n++ ) 102 { 103 code = *read++; 104 105 if ( code == 0 ) 106 break; 107 108 if ( code < 32 || code > 127 ) 109 code = '?'; 110 111 string[n] = (char)code; 112 } 113 114 string[n] = 0; 115 116 return string; 117 } 118 119 120 typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry, 121 FT_Memory memory ); 122 123 124 /*************************************************************************/ 125 /* */ 126 /* <Function> */ 127 /* tt_face_get_name */ 128 /* */ 129 /* <Description> */ 130 /* Returns a given ENGLISH name record in ASCII. */ 131 /* */ 132 /* <Input> */ 133 /* face :: A handle to the source face object. */ 134 /* */ 135 /* nameid :: The name id of the name record to return. */ 136 /* */ 137 /* <InOut> */ 138 /* name :: The address of a string pointer. NULL if no name is */ 139 /* present. */ 140 /* */ 141 /* <Return> */ 142 /* FreeType error code. 0 means success. */ 143 /* */ 144 static FT_Error 145 tt_face_get_name( TT_Face face, 146 FT_UShort nameid, 147 FT_String** name ) 148 { 149 FT_Memory memory = face->root.memory; 150 FT_Error error = FT_Err_Ok; 151 FT_String* result = NULL; 152 FT_UShort n; 153 TT_NameEntryRec* rec; 154 FT_Int found_apple = -1; 155 FT_Int found_apple_roman = -1; 156 FT_Int found_apple_english = -1; 157 FT_Int found_win = -1; 158 FT_Int found_unicode = -1; 159 160 FT_Bool is_english = 0; 161 162 TT_NameEntry_ConvertFunc convert; 163 164 165 FT_ASSERT( name ); 166 167 rec = face->name_table.names; 168 for ( n = 0; n < face->num_names; n++, rec++ ) 169 { 170 /* According to the OpenType 1.3 specification, only Microsoft or */ 171 /* Apple platform IDs might be used in the `name' table. The */ 172 /* `Unicode' platform is reserved for the `cmap' table, and the */ 173 /* `ISO' one is deprecated. */ 174 /* */ 175 /* However, the Apple TrueType specification doesn't say the same */ 176 /* thing and goes to suggest that all Unicode `name' table entries */ 177 /* should be coded in UTF-16 (in big-endian format I suppose). */ 178 /* */ 179 if ( rec->nameID == nameid && rec->stringLength > 0 ) 180 { 181 switch ( rec->platformID ) 182 { 183 case TT_PLATFORM_APPLE_UNICODE: 184 case TT_PLATFORM_ISO: 185 /* there is `languageID' to check there. We should use this */ 186 /* field only as a last solution when nothing else is */ 187 /* available. */ 188 /* */ 189 found_unicode = n; 190 break; 191 192 case TT_PLATFORM_MACINTOSH: 193 /* This is a bit special because some fonts will use either */ 194 /* an English language id, or a Roman encoding id, to indicate */ 195 /* the English version of its font name. */ 196 /* */ 197 if ( rec->languageID == TT_MAC_LANGID_ENGLISH ) 198 found_apple_english = n; 199 else if ( rec->encodingID == TT_MAC_ID_ROMAN ) 200 found_apple_roman = n; 201 break; 202 203 case TT_PLATFORM_MICROSOFT: 204 /* we only take a non-English name when there is nothing */ 205 /* else available in the font */ 206 /* */ 207 if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 ) 208 { 209 switch ( rec->encodingID ) 210 { 211 case TT_MS_ID_SYMBOL_CS: 212 case TT_MS_ID_UNICODE_CS: 213 case TT_MS_ID_UCS_4: 214 is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 ); 215 found_win = n; 216 break; 217 218 default: 219 ; 220 } 221 } 222 break; 223 224 default: 225 ; 226 } 227 } 228 } 229 230 found_apple = found_apple_roman; 231 if ( found_apple_english >= 0 ) 232 found_apple = found_apple_english; 233 234 /* some fonts contain invalid Unicode or Macintosh formatted entries; */ 235 /* we will thus favor names encoded in Windows formats if available */ 236 /* (provided it is an English name) */ 237 /* */ 238 convert = NULL; 239 if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) ) 240 { 241 rec = face->name_table.names + found_win; 242 switch ( rec->encodingID ) 243 { 244 /* all Unicode strings are encoded using UTF-16BE */ 245 case TT_MS_ID_UNICODE_CS: 246 case TT_MS_ID_SYMBOL_CS: 247 convert = tt_name_entry_ascii_from_utf16; 248 break; 249 250 case TT_MS_ID_UCS_4: 251 /* Apparently, if this value is found in a name table entry, it is */ 252 /* documented as `full Unicode repertoire'. Experience with the */ 253 /* MsGothic font shipped with Windows Vista shows that this really */ 254 /* means UTF-16 encoded names (UCS-4 values are only used within */ 255 /* charmaps). */ 256 convert = tt_name_entry_ascii_from_utf16; 257 break; 258 259 default: 260 ; 261 } 262 } 263 else if ( found_apple >= 0 ) 264 { 265 rec = face->name_table.names + found_apple; 266 convert = tt_name_entry_ascii_from_other; 267 } 268 else if ( found_unicode >= 0 ) 269 { 270 rec = face->name_table.names + found_unicode; 271 convert = tt_name_entry_ascii_from_utf16; 272 } 273 274 if ( rec && convert ) 275 { 276 if ( rec->string == NULL ) 277 { 278 FT_Stream stream = face->name_table.stream; 279 280 281 if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) || 282 FT_STREAM_SEEK( rec->stringOffset ) || 283 FT_STREAM_READ( rec->string, rec->stringLength ) ) 284 { 285 FT_FREE( rec->string ); 286 rec->stringLength = 0; 287 result = NULL; 288 goto Exit; 289 } 290 } 291 292 result = convert( rec, memory ); 293 } 294 295 Exit: 296 *name = result; 297 return error; 298 } 299 300 301 static FT_Encoding 302 sfnt_find_encoding( int platform_id, 303 int encoding_id ) 304 { 305 typedef struct TEncoding_ 306 { 307 int platform_id; 308 int encoding_id; 309 FT_Encoding encoding; 310 311 } TEncoding; 312 313 static 314 const TEncoding tt_encodings[] = 315 { 316 { TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE }, 317 318 { TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE }, 319 320 { TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN }, 321 322 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, FT_ENCODING_MS_SYMBOL }, 323 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UCS_4, FT_ENCODING_UNICODE }, 324 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, FT_ENCODING_UNICODE }, 325 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, FT_ENCODING_SJIS }, 326 { TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, FT_ENCODING_GB2312 }, 327 { TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, FT_ENCODING_BIG5 }, 328 { TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, FT_ENCODING_WANSUNG }, 329 { TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, FT_ENCODING_JOHAB } 330 }; 331 332 const TEncoding *cur, *limit; 333 334 335 cur = tt_encodings; 336 limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] ); 337 338 for ( ; cur < limit; cur++ ) 339 { 340 if ( cur->platform_id == platform_id ) 341 { 342 if ( cur->encoding_id == encoding_id || 343 cur->encoding_id == -1 ) 344 return cur->encoding; 345 } 346 } 347 348 return FT_ENCODING_NONE; 349 } 350 351 352 /* Fill in face->ttc_header. If the font is not a TTC, it is */ 353 /* synthesized into a TTC with one offset table. */ 354 static FT_Error 355 sfnt_open_font( FT_Stream stream, 356 TT_Face face ) 357 { 358 FT_Memory memory = stream->memory; 359 FT_Error error; 360 FT_ULong tag, offset; 361 362 static const FT_Frame_Field ttc_header_fields[] = 363 { 364#undef FT_STRUCTURE 365#define FT_STRUCTURE TTC_HeaderRec 366 367 FT_FRAME_START( 8 ), 368 FT_FRAME_LONG( version ), 369 FT_FRAME_LONG( count ), /* this is ULong in the specs */ 370 FT_FRAME_END 371 }; 372 373 374 face->ttc_header.tag = 0; 375 face->ttc_header.version = 0; 376 face->ttc_header.count = 0; 377 378 offset = FT_STREAM_POS(); 379 380 if ( FT_READ_ULONG( tag ) ) 381 return error; 382 383 if ( tag != 0x00010000UL && 384 tag != TTAG_ttcf && 385 tag != TTAG_OTTO && 386 tag != TTAG_true && 387 tag != TTAG_typ1 && 388 tag != 0x00020000UL ) 389 { 390 FT_TRACE2(( " not a font using the SFNT container format\n" )); 391 return FT_THROW( Unknown_File_Format ); 392 } 393 394 face->ttc_header.tag = TTAG_ttcf; 395 396 if ( tag == TTAG_ttcf ) 397 { 398 FT_Int n; 399 400 401 FT_TRACE3(( "sfnt_open_font: file is a collection\n" )); 402 403 if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) ) 404 return error; 405 406 if ( face->ttc_header.count == 0 ) 407 return FT_THROW( Invalid_Table ); 408 409 /* a rough size estimate: let's conservatively assume that there */ 410 /* is just a single table info in each subfont header (12 + 16*1 = */ 411 /* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */ 412 /* size of the TTC header plus `28*count' bytes for all subfont */ 413 /* headers */ 414 if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) ) 415 return FT_THROW( Array_Too_Large ); 416 417 /* now read the offsets of each font in the file */ 418 if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) ) 419 return error; 420 421 if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) ) 422 return error; 423 424 for ( n = 0; n < face->ttc_header.count; n++ ) 425 face->ttc_header.offsets[n] = FT_GET_ULONG(); 426 427 FT_FRAME_EXIT(); 428 } 429 else 430 { 431 FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" )); 432 433 face->ttc_header.version = 1 << 16; 434 face->ttc_header.count = 1; 435 436 if ( FT_NEW( face->ttc_header.offsets ) ) 437 return error; 438 439 face->ttc_header.offsets[0] = offset; 440 } 441 442 return error; 443 } 444 445 446 FT_LOCAL_DEF( FT_Error ) 447 sfnt_init_face( FT_Stream stream, 448 TT_Face face, 449 FT_Int face_index, 450 FT_Int num_params, 451 FT_Parameter* params ) 452 { 453 FT_Error error; 454 FT_Library library = face->root.driver->root.library; 455 SFNT_Service sfnt; 456 457 458 /* for now, parameters are unused */ 459 FT_UNUSED( num_params ); 460 FT_UNUSED( params ); 461 462 463 sfnt = (SFNT_Service)face->sfnt; 464 if ( !sfnt ) 465 { 466 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); 467 if ( !sfnt ) 468 { 469 FT_ERROR(( "sfnt_init_face: cannot access `sfnt' module\n" )); 470 return FT_THROW( Missing_Module ); 471 } 472 473 face->sfnt = sfnt; 474 face->goto_table = sfnt->goto_table; 475 } 476 477 FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS ); 478 479 FT_TRACE2(( "SFNT driver\n" )); 480 481 error = sfnt_open_font( stream, face ); 482 if ( error ) 483 return error; 484 485 FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index )); 486 487 if ( face_index < 0 ) 488 face_index = 0; 489 490 if ( face_index >= face->ttc_header.count ) 491 return FT_THROW( Invalid_Argument ); 492 493 if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) ) 494 return error; 495 496 /* check that we have a valid TrueType file */ 497 error = sfnt->load_font_dir( face, stream ); 498 if ( error ) 499 return error; 500 501 face->root.num_faces = face->ttc_header.count; 502 face->root.face_index = face_index; 503 504 return error; 505 } 506 507 508#define LOAD_( x ) \ 509 do { \ 510 FT_TRACE2(( "`" #x "' " )); \ 511 FT_TRACE3(( "-->\n" )); \ 512 \ 513 error = sfnt->load_ ## x( face, stream ); \ 514 \ 515 FT_TRACE2(( "%s\n", ( !error ) \ 516 ? "loaded" \ 517 : FT_ERR_EQ( error, Table_Missing ) \ 518 ? "missing" \ 519 : "failed to load" )); \ 520 FT_TRACE3(( "\n" )); \ 521 } while ( 0 ) 522 523#define LOADM_( x, vertical ) \ 524 do { \ 525 FT_TRACE2(( "`%s" #x "' ", \ 526 vertical ? "vertical " : "" )); \ 527 FT_TRACE3(( "-->\n" )); \ 528 \ 529 error = sfnt->load_ ## x( face, stream, vertical ); \ 530 \ 531 FT_TRACE2(( "%s\n", ( !error ) \ 532 ? "loaded" \ 533 : FT_ERR_EQ( error, Table_Missing ) \ 534 ? "missing" \ 535 : "failed to load" )); \ 536 FT_TRACE3(( "\n" )); \ 537 } while ( 0 ) 538 539#define GET_NAME( id, field ) \ 540 do { \ 541 error = tt_face_get_name( face, TT_NAME_ID_ ## id, field ); \ 542 if ( error ) \ 543 goto Exit; \ 544 } while ( 0 ) 545 546 547 FT_LOCAL_DEF( FT_Error ) 548 sfnt_load_face( FT_Stream stream, 549 TT_Face face, 550 FT_Int face_index, 551 FT_Int num_params, 552 FT_Parameter* params ) 553 { 554 FT_Error error; 555#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 556 FT_Error psnames_error; 557#endif 558 FT_Bool has_outline; 559 FT_Bool is_apple_sbit; 560 FT_Bool ignore_preferred_family = FALSE; 561 FT_Bool ignore_preferred_subfamily = FALSE; 562 563 SFNT_Service sfnt = (SFNT_Service)face->sfnt; 564 565 FT_UNUSED( face_index ); 566 567 568 /* Check parameters */ 569 570 { 571 FT_Int i; 572 573 574 for ( i = 0; i < num_params; i++ ) 575 { 576 if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY ) 577 ignore_preferred_family = TRUE; 578 else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY ) 579 ignore_preferred_subfamily = TRUE; 580 } 581 } 582 583 /* Load tables */ 584 585 /* We now support two SFNT-based bitmapped font formats. They */ 586 /* are recognized easily as they do not include a `glyf' */ 587 /* table. */ 588 /* */ 589 /* The first format comes from Apple, and uses a table named */ 590 /* `bhed' instead of `head' to store the font header (using */ 591 /* the same format). It also doesn't include horizontal and */ 592 /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */ 593 /* missing). */ 594 /* */ 595 /* The other format comes from Microsoft, and is used with */ 596 /* WinCE/PocketPC. It looks like a standard TTF, except that */ 597 /* it doesn't contain outlines. */ 598 /* */ 599 600 FT_TRACE2(( "sfnt_load_face: %08p\n\n", face )); 601 602 /* do we have outlines in there? */ 603#ifdef FT_CONFIG_OPTION_INCREMENTAL 604 has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 || 605 tt_face_lookup_table( face, TTAG_glyf ) != 0 || 606 tt_face_lookup_table( face, TTAG_CFF ) != 0 ); 607#else 608 has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 || 609 tt_face_lookup_table( face, TTAG_CFF ) != 0 ); 610#endif 611 612 is_apple_sbit = 0; 613 614 /* if this font doesn't contain outlines, we try to load */ 615 /* a `bhed' table */ 616 if ( !has_outline && sfnt->load_bhed ) 617 { 618 LOAD_( bhed ); 619 is_apple_sbit = FT_BOOL( !error ); 620 } 621 622 /* load the font header (`head' table) if this isn't an Apple */ 623 /* sbit font file */ 624 if ( !is_apple_sbit ) 625 { 626 LOAD_( head ); 627 if ( error ) 628 goto Exit; 629 } 630 631 if ( face->header.Units_Per_EM == 0 ) 632 { 633 error = FT_THROW( Invalid_Table ); 634 635 goto Exit; 636 } 637 638 /* the following tables are often not present in embedded TrueType */ 639 /* fonts within PDF documents, so don't check for them. */ 640 LOAD_( maxp ); 641 LOAD_( cmap ); 642 643 /* the following tables are optional in PCL fonts -- */ 644 /* don't check for errors */ 645 LOAD_( name ); 646 LOAD_( post ); 647 648#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 649 psnames_error = error; 650#endif 651 652 /* do not load the metrics headers and tables if this is an Apple */ 653 /* sbit font file */ 654 if ( !is_apple_sbit ) 655 { 656 /* load the `hhea' and `hmtx' tables */ 657 LOADM_( hhea, 0 ); 658 if ( !error ) 659 { 660 LOADM_( hmtx, 0 ); 661 if ( FT_ERR_EQ( error, Table_Missing ) ) 662 { 663 error = FT_THROW( Hmtx_Table_Missing ); 664 665#ifdef FT_CONFIG_OPTION_INCREMENTAL 666 /* If this is an incrementally loaded font and there are */ 667 /* overriding metrics, tolerate a missing `hmtx' table. */ 668 if ( face->root.internal->incremental_interface && 669 face->root.internal->incremental_interface->funcs-> 670 get_glyph_metrics ) 671 { 672 face->horizontal.number_Of_HMetrics = 0; 673 error = FT_Err_Ok; 674 } 675#endif 676 } 677 } 678 else if ( FT_ERR_EQ( error, Table_Missing ) ) 679 { 680 /* No `hhea' table necessary for SFNT Mac fonts. */ 681 if ( face->format_tag == TTAG_true ) 682 { 683 FT_TRACE2(( "This is an SFNT Mac font.\n" )); 684 685 has_outline = 0; 686 error = FT_Err_Ok; 687 } 688 else 689 { 690 error = FT_THROW( Horiz_Header_Missing ); 691 692#ifdef FT_CONFIG_OPTION_INCREMENTAL 693 /* If this is an incrementally loaded font and there are */ 694 /* overriding metrics, tolerate a missing `hhea' table. */ 695 if ( face->root.internal->incremental_interface && 696 face->root.internal->incremental_interface->funcs-> 697 get_glyph_metrics ) 698 { 699 face->horizontal.number_Of_HMetrics = 0; 700 error = FT_Err_Ok; 701 } 702#endif 703 704 } 705 } 706 707 if ( error ) 708 goto Exit; 709 710 /* try to load the `vhea' and `vmtx' tables */ 711 LOADM_( hhea, 1 ); 712 if ( !error ) 713 { 714 LOADM_( hmtx, 1 ); 715 if ( !error ) 716 face->vertical_info = 1; 717 } 718 719 if ( error && FT_ERR_NEQ( error, Table_Missing ) ) 720 goto Exit; 721 722 LOAD_( os2 ); 723 if ( error ) 724 { 725 /* we treat the table as missing if there are any errors */ 726 face->os2.version = 0xFFFFU; 727 } 728 } 729 730 /* the optional tables */ 731 732 /* embedded bitmap support */ 733 if ( sfnt->load_eblc ) 734 { 735 LOAD_( eblc ); 736 if ( error ) 737 { 738 /* a font which contains neither bitmaps nor outlines is */ 739 /* still valid (although rather useless in most cases); */ 740 /* however, you can find such stripped fonts in PDFs */ 741 if ( FT_ERR_EQ( error, Table_Missing ) ) 742 error = FT_Err_Ok; 743 else 744 goto Exit; 745 } 746 } 747 748 LOAD_( pclt ); 749 if ( error ) 750 { 751 if ( FT_ERR_NEQ( error, Table_Missing ) ) 752 goto Exit; 753 754 face->pclt.Version = 0; 755 } 756 757 /* consider the kerning and gasp tables as optional */ 758 LOAD_( gasp ); 759 LOAD_( kern ); 760 761 face->root.num_glyphs = face->max_profile.numGlyphs; 762 763 /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */ 764 /* a WWS-only font face. `WWS' stands for `weight', width', and */ 765 /* `slope', a term used by Microsoft's Windows Presentation */ 766 /* Foundation (WPF). This flag has been introduced in version */ 767 /* 1.5 of the OpenType specification (May 2008). */ 768 769 face->root.family_name = NULL; 770 face->root.style_name = NULL; 771 if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 ) 772 { 773 if ( !ignore_preferred_family ) 774 GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); 775 if ( !face->root.family_name ) 776 GET_NAME( FONT_FAMILY, &face->root.family_name ); 777 778 if ( !ignore_preferred_subfamily ) 779 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); 780 if ( !face->root.style_name ) 781 GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); 782 } 783 else 784 { 785 GET_NAME( WWS_FAMILY, &face->root.family_name ); 786 if ( !face->root.family_name && !ignore_preferred_family ) 787 GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); 788 if ( !face->root.family_name ) 789 GET_NAME( FONT_FAMILY, &face->root.family_name ); 790 791 GET_NAME( WWS_SUBFAMILY, &face->root.style_name ); 792 if ( !face->root.style_name && !ignore_preferred_subfamily ) 793 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); 794 if ( !face->root.style_name ) 795 GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); 796 } 797 798 /* now set up root fields */ 799 { 800 FT_Face root = &face->root; 801 FT_Long flags = root->face_flags; 802 803 804 /*********************************************************************/ 805 /* */ 806 /* Compute face flags. */ 807 /* */ 808 if ( has_outline == TRUE ) 809 flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */ 810 811 /* The sfnt driver only supports bitmap fonts natively, thus we */ 812 /* don't set FT_FACE_FLAG_HINTER. */ 813 flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */ 814 FT_FACE_FLAG_HORIZONTAL; /* horizontal data */ 815 816#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 817 if ( !psnames_error && 818 face->postscript.FormatType != 0x00030000L ) 819 flags |= FT_FACE_FLAG_GLYPH_NAMES; 820#endif 821 822 /* fixed width font? */ 823 if ( face->postscript.isFixedPitch ) 824 flags |= FT_FACE_FLAG_FIXED_WIDTH; 825 826 /* vertical information? */ 827 if ( face->vertical_info ) 828 flags |= FT_FACE_FLAG_VERTICAL; 829 830 /* kerning available ? */ 831 if ( TT_FACE_HAS_KERNING( face ) ) 832 flags |= FT_FACE_FLAG_KERNING; 833 834#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 835 /* Don't bother to load the tables unless somebody asks for them. */ 836 /* No need to do work which will (probably) not be used. */ 837 if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 && 838 tt_face_lookup_table( face, TTAG_fvar ) != 0 && 839 tt_face_lookup_table( face, TTAG_gvar ) != 0 ) 840 flags |= FT_FACE_FLAG_MULTIPLE_MASTERS; 841#endif 842 843 root->face_flags = flags; 844 845 /*********************************************************************/ 846 /* */ 847 /* Compute style flags. */ 848 /* */ 849 850 flags = 0; 851 if ( has_outline == TRUE && face->os2.version != 0xFFFFU ) 852 { 853 /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */ 854 /* indicates an oblique font face. This flag has been */ 855 /* introduced in version 1.5 of the OpenType specification. */ 856 857 if ( face->os2.fsSelection & 512 ) /* bit 9 */ 858 flags |= FT_STYLE_FLAG_ITALIC; 859 else if ( face->os2.fsSelection & 1 ) /* bit 0 */ 860 flags |= FT_STYLE_FLAG_ITALIC; 861 862 if ( face->os2.fsSelection & 32 ) /* bit 5 */ 863 flags |= FT_STYLE_FLAG_BOLD; 864 } 865 else 866 { 867 /* this is an old Mac font, use the header field */ 868 869 if ( face->header.Mac_Style & 1 ) 870 flags |= FT_STYLE_FLAG_BOLD; 871 872 if ( face->header.Mac_Style & 2 ) 873 flags |= FT_STYLE_FLAG_ITALIC; 874 } 875 876 root->style_flags = flags; 877 878 /*********************************************************************/ 879 /* */ 880 /* Polish the charmaps. */ 881 /* */ 882 /* Try to set the charmap encoding according to the platform & */ 883 /* encoding ID of each charmap. */ 884 /* */ 885 886 tt_face_build_cmaps( face ); /* ignore errors */ 887 888 889 /* set the encoding fields */ 890 { 891 FT_Int m; 892 893 894 for ( m = 0; m < root->num_charmaps; m++ ) 895 { 896 FT_CharMap charmap = root->charmaps[m]; 897 898 899 charmap->encoding = sfnt_find_encoding( charmap->platform_id, 900 charmap->encoding_id ); 901 902#if 0 903 if ( root->charmap == NULL && 904 charmap->encoding == FT_ENCODING_UNICODE ) 905 { 906 /* set 'root->charmap' to the first Unicode encoding we find */ 907 root->charmap = charmap; 908 } 909#endif 910 } 911 } 912 913#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 914 915 /* 916 * Now allocate the root array of FT_Bitmap_Size records and 917 * populate them. Unfortunately, it isn't possible to indicate bit 918 * depths in the FT_Bitmap_Size record. This is a design error. 919 */ 920 { 921 FT_UInt i, count; 922 923 924 count = face->sbit_num_strikes; 925 926 if ( count > 0 ) 927 { 928 FT_Memory memory = face->root.stream->memory; 929 FT_UShort em_size = face->header.Units_Per_EM; 930 FT_Short avgwidth = face->os2.xAvgCharWidth; 931 FT_Size_Metrics metrics; 932 933 934 if ( em_size == 0 || face->os2.version == 0xFFFFU ) 935 { 936 avgwidth = 0; 937 em_size = 1; 938 } 939 940 if ( FT_NEW_ARRAY( root->available_sizes, count ) ) 941 goto Exit; 942 943 for ( i = 0; i < count; i++ ) 944 { 945 FT_Bitmap_Size* bsize = root->available_sizes + i; 946 947 948 error = sfnt->load_strike_metrics( face, i, &metrics ); 949 if ( error ) 950 goto Exit; 951 952 bsize->height = (FT_Short)( metrics.height >> 6 ); 953 bsize->width = (FT_Short)( 954 ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size ); 955 956 bsize->x_ppem = metrics.x_ppem << 6; 957 bsize->y_ppem = metrics.y_ppem << 6; 958 959 /* assume 72dpi */ 960 bsize->size = metrics.y_ppem << 6; 961 } 962 963 root->face_flags |= FT_FACE_FLAG_FIXED_SIZES; 964 root->num_fixed_sizes = (FT_Int)count; 965 } 966 } 967 968#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 969 970 /* a font with no bitmaps and no outlines is scalable; */ 971 /* it has only empty glyphs then */ 972 if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) ) 973 root->face_flags |= FT_FACE_FLAG_SCALABLE; 974 975 976 /*********************************************************************/ 977 /* */ 978 /* Set up metrics. */ 979 /* */ 980 if ( FT_IS_SCALABLE( root ) ) 981 { 982 /* XXX What about if outline header is missing */ 983 /* (e.g. sfnt wrapped bitmap)? */ 984 root->bbox.xMin = face->header.xMin; 985 root->bbox.yMin = face->header.yMin; 986 root->bbox.xMax = face->header.xMax; 987 root->bbox.yMax = face->header.yMax; 988 root->units_per_EM = face->header.Units_Per_EM; 989 990 991 /* XXX: Computing the ascender/descender/height is very different */ 992 /* from what the specification tells you. Apparently, we */ 993 /* must be careful because */ 994 /* */ 995 /* - not all fonts have an OS/2 table; in this case, we take */ 996 /* the values in the horizontal header. However, these */ 997 /* values very often are not reliable. */ 998 /* */ 999 /* - otherwise, the correct typographic values are in the */ 1000 /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */ 1001 /* */ 1002 /* However, certain fonts have these fields set to 0. */ 1003 /* Rather, they have usWinAscent & usWinDescent correctly */ 1004 /* set (but with different values). */ 1005 /* */ 1006 /* As an example, Arial Narrow is implemented through four */ 1007 /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */ 1008 /* */ 1009 /* Strangely, all fonts have the same values in their */ 1010 /* sTypoXXX fields, except ARIALNB which sets them to 0. */ 1011 /* */ 1012 /* On the other hand, they all have different */ 1013 /* usWinAscent/Descent values -- as a conclusion, the OS/2 */ 1014 /* table cannot be used to compute the text height reliably! */ 1015 /* */ 1016 1017 /* The ascender and descender are taken from the `hhea' table. */ 1018 /* If zero, they are taken from the `OS/2' table. */ 1019 1020 root->ascender = face->horizontal.Ascender; 1021 root->descender = face->horizontal.Descender; 1022 1023 root->height = (FT_Short)( root->ascender - root->descender + 1024 face->horizontal.Line_Gap ); 1025 1026 if ( !( root->ascender || root->descender ) ) 1027 { 1028 if ( face->os2.version != 0xFFFFU ) 1029 { 1030 if ( face->os2.sTypoAscender || face->os2.sTypoDescender ) 1031 { 1032 root->ascender = face->os2.sTypoAscender; 1033 root->descender = face->os2.sTypoDescender; 1034 1035 root->height = (FT_Short)( root->ascender - root->descender + 1036 face->os2.sTypoLineGap ); 1037 } 1038 else 1039 { 1040 root->ascender = (FT_Short)face->os2.usWinAscent; 1041 root->descender = -(FT_Short)face->os2.usWinDescent; 1042 1043 root->height = (FT_UShort)( root->ascender - root->descender ); 1044 } 1045 } 1046 } 1047 1048 root->max_advance_width = face->horizontal.advance_Width_Max; 1049 root->max_advance_height = (FT_Short)( face->vertical_info 1050 ? face->vertical.advance_Height_Max 1051 : root->height ); 1052 1053 /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */ 1054 /* Adjust underline position from top edge to centre of */ 1055 /* stroke to convert TrueType meaning to FreeType meaning. */ 1056 root->underline_position = face->postscript.underlinePosition - 1057 face->postscript.underlineThickness / 2; 1058 root->underline_thickness = face->postscript.underlineThickness; 1059 } 1060 1061 } 1062 1063 Exit: 1064 FT_TRACE2(( "sfnt_load_face: done\n" )); 1065 1066 return error; 1067 } 1068 1069 1070#undef LOAD_ 1071#undef LOADM_ 1072#undef GET_NAME 1073 1074 1075 FT_LOCAL_DEF( void ) 1076 sfnt_done_face( TT_Face face ) 1077 { 1078 FT_Memory memory; 1079 SFNT_Service sfnt; 1080 1081 1082 if ( !face ) 1083 return; 1084 1085 memory = face->root.memory; 1086 sfnt = (SFNT_Service)face->sfnt; 1087 1088 if ( sfnt ) 1089 { 1090 /* destroy the postscript names table if it is loaded */ 1091 if ( sfnt->free_psnames ) 1092 sfnt->free_psnames( face ); 1093 1094 /* destroy the embedded bitmaps table if it is loaded */ 1095 if ( sfnt->free_eblc ) 1096 sfnt->free_eblc( face ); 1097 } 1098 1099#ifdef TT_CONFIG_OPTION_BDF 1100 /* freeing the embedded BDF properties */ 1101 tt_face_free_bdf_props( face ); 1102#endif 1103 1104 /* freeing the kerning table */ 1105 tt_face_done_kern( face ); 1106 1107 /* freeing the collection table */ 1108 FT_FREE( face->ttc_header.offsets ); 1109 face->ttc_header.count = 0; 1110 1111 /* freeing table directory */ 1112 FT_FREE( face->dir_tables ); 1113 face->num_tables = 0; 1114 1115 { 1116 FT_Stream stream = FT_FACE_STREAM( face ); 1117 1118 1119 /* simply release the 'cmap' table frame */ 1120 FT_FRAME_RELEASE( face->cmap_table ); 1121 face->cmap_size = 0; 1122 } 1123 1124 /* freeing the horizontal metrics */ 1125 { 1126 FT_Stream stream = FT_FACE_STREAM( face ); 1127 1128 1129 FT_FRAME_RELEASE( face->horz_metrics ); 1130 FT_FRAME_RELEASE( face->vert_metrics ); 1131 face->horz_metrics_size = 0; 1132 face->vert_metrics_size = 0; 1133 } 1134 1135 /* freeing the vertical ones, if any */ 1136 if ( face->vertical_info ) 1137 { 1138 FT_FREE( face->vertical.long_metrics ); 1139 FT_FREE( face->vertical.short_metrics ); 1140 face->vertical_info = 0; 1141 } 1142 1143 /* freeing the gasp table */ 1144 FT_FREE( face->gasp.gaspRanges ); 1145 face->gasp.numRanges = 0; 1146 1147 /* freeing the name table */ 1148 if ( sfnt ) 1149 sfnt->free_name( face ); 1150 1151 /* freeing family and style name */ 1152 FT_FREE( face->root.family_name ); 1153 FT_FREE( face->root.style_name ); 1154 1155 /* freeing sbit size table */ 1156 FT_FREE( face->root.available_sizes ); 1157 face->root.num_fixed_sizes = 0; 1158 1159 FT_FREE( face->postscript_name ); 1160 1161 face->sfnt = 0; 1162 } 1163 1164 1165/* END */ 1166