1 /***************************************************************************/ 2 /* */ 3 /* sfobjs.c */ 4 /* */ 5 /* SFNT object management (base). */ 6 /* */ 7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 "sfobjs.h" 21 #include "ttload.h" 22 #include "ttcmap.h" 23 #include "ttkern.h" 24 #include FT_INTERNAL_SFNT_H 25 #include FT_INTERNAL_DEBUG_H 26 #include FT_TRUETYPE_IDS_H 27 #include FT_TRUETYPE_TAGS_H 28 #include FT_SERVICE_POSTSCRIPT_CMAPS_H 29 #include FT_SFNT_NAMES_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* tt_name_entry_ascii_from_utf16(TT_NameEntry entry,FT_Memory memory)50 tt_name_entry_ascii_from_utf16( TT_NameEntry entry, 51 FT_Memory memory ) 52 { 53 FT_String* string; 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 if ( code < 32 || code > 127 ) 68 code = '?'; 69 70 string[n] = (char)code; 71 } 72 73 string[len] = 0; 74 75 return string; 76 } 77 78 79 /* convert an Apple Roman or symbol name entry to ASCII */ 80 static FT_String* tt_name_entry_ascii_from_other(TT_NameEntry entry,FT_Memory memory)81 tt_name_entry_ascii_from_other( TT_NameEntry entry, 82 FT_Memory memory ) 83 { 84 FT_String* string; 85 FT_UInt len, code, n; 86 FT_Byte* read = (FT_Byte*)entry->string; 87 FT_Error error; 88 89 90 len = (FT_UInt)entry->stringLength; 91 92 if ( FT_NEW_ARRAY( string, len + 1 ) ) 93 return NULL; 94 95 for ( n = 0; n < len; n++ ) 96 { 97 code = *read++; 98 if ( code < 32 || code > 127 ) 99 code = '?'; 100 101 string[n] = (char)code; 102 } 103 104 string[len] = 0; 105 106 return string; 107 } 108 109 110 typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry, 111 FT_Memory memory ); 112 113 114 /*************************************************************************/ 115 /* */ 116 /* <Function> */ 117 /* tt_face_get_name */ 118 /* */ 119 /* <Description> */ 120 /* Returns a given ENGLISH name record in ASCII. */ 121 /* */ 122 /* <Input> */ 123 /* face :: A handle to the source face object. */ 124 /* */ 125 /* nameid :: The name id of the name record to return. */ 126 /* */ 127 /* <InOut> */ 128 /* name :: The address of a string pointer. NULL if no name is */ 129 /* present. */ 130 /* */ 131 /* <Return> */ 132 /* FreeType error code. 0 means success. */ 133 /* */ 134 static FT_Error tt_face_get_name(TT_Face face,FT_UShort nameid,FT_String ** name)135 tt_face_get_name( TT_Face face, 136 FT_UShort nameid, 137 FT_String** name ) 138 { 139 FT_Memory memory = face->root.memory; 140 FT_Error error = SFNT_Err_Ok; 141 FT_String* result = NULL; 142 FT_UShort n; 143 TT_NameEntryRec* rec; 144 FT_Int found_apple = -1; 145 FT_Int found_apple_roman = -1; 146 FT_Int found_apple_english = -1; 147 FT_Int found_win = -1; 148 FT_Int found_unicode = -1; 149 150 FT_Bool is_english = 0; 151 152 TT_NameEntry_ConvertFunc convert; 153 154 155 FT_ASSERT( name ); 156 157 rec = face->name_table.names; 158 for ( n = 0; n < face->num_names; n++, rec++ ) 159 { 160 /* According to the OpenType 1.3 specification, only Microsoft or */ 161 /* Apple platform IDs might be used in the `name' table. The */ 162 /* `Unicode' platform is reserved for the `cmap' table, and the */ 163 /* `Iso' one is deprecated. */ 164 /* */ 165 /* However, the Apple TrueType specification doesn't say the same */ 166 /* thing and goes to suggest that all Unicode `name' table entries */ 167 /* should be coded in UTF-16 (in big-endian format I suppose). */ 168 /* */ 169 if ( rec->nameID == nameid && rec->stringLength > 0 ) 170 { 171 switch ( rec->platformID ) 172 { 173 case TT_PLATFORM_APPLE_UNICODE: 174 case TT_PLATFORM_ISO: 175 /* there is `languageID' to check there. We should use this */ 176 /* field only as a last solution when nothing else is */ 177 /* available. */ 178 /* */ 179 found_unicode = n; 180 break; 181 182 case TT_PLATFORM_MACINTOSH: 183 /* This is a bit special because some fonts will use either */ 184 /* an English language id, or a Roman encoding id, to indicate */ 185 /* the English version of its font name. */ 186 /* */ 187 if ( rec->languageID == TT_MAC_LANGID_ENGLISH ) 188 found_apple_english = n; 189 else if ( rec->encodingID == TT_MAC_ID_ROMAN ) 190 found_apple_roman = n; 191 break; 192 193 case TT_PLATFORM_MICROSOFT: 194 /* we only take a non-English name when there is nothing */ 195 /* else available in the font */ 196 /* */ 197 if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 ) 198 { 199 switch ( rec->encodingID ) 200 { 201 case TT_MS_ID_SYMBOL_CS: 202 case TT_MS_ID_UNICODE_CS: 203 case TT_MS_ID_UCS_4: 204 is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 ); 205 found_win = n; 206 break; 207 208 default: 209 ; 210 } 211 } 212 break; 213 214 default: 215 ; 216 } 217 } 218 } 219 220 found_apple = found_apple_roman; 221 if ( found_apple_english >= 0 ) 222 found_apple = found_apple_english; 223 224 /* some fonts contain invalid Unicode or Macintosh formatted entries; */ 225 /* we will thus favor names encoded in Windows formats if available */ 226 /* (provided it is an English name) */ 227 /* */ 228 convert = NULL; 229 if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) ) 230 { 231 rec = face->name_table.names + found_win; 232 switch ( rec->encodingID ) 233 { 234 /* all Unicode strings are encoded using UTF-16BE */ 235 case TT_MS_ID_UNICODE_CS: 236 case TT_MS_ID_SYMBOL_CS: 237 convert = tt_name_entry_ascii_from_utf16; 238 break; 239 240 case TT_MS_ID_UCS_4: 241 /* Apparently, if this value is found in a name table entry, it is */ 242 /* documented as `full Unicode repertoire'. Experience with the */ 243 /* MsGothic font shipped with Windows Vista shows that this really */ 244 /* means UTF-16 encoded names (UCS-4 values are only used within */ 245 /* charmaps). */ 246 convert = tt_name_entry_ascii_from_utf16; 247 break; 248 249 default: 250 ; 251 } 252 } 253 else if ( found_apple >= 0 ) 254 { 255 rec = face->name_table.names + found_apple; 256 convert = tt_name_entry_ascii_from_other; 257 } 258 else if ( found_unicode >= 0 ) 259 { 260 rec = face->name_table.names + found_unicode; 261 convert = tt_name_entry_ascii_from_utf16; 262 } 263 264 if ( rec && convert ) 265 { 266 if ( rec->string == NULL ) 267 { 268 FT_Stream stream = face->name_table.stream; 269 270 271 if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) || 272 FT_STREAM_SEEK( rec->stringOffset ) || 273 FT_STREAM_READ( rec->string, rec->stringLength ) ) 274 { 275 FT_FREE( rec->string ); 276 rec->stringLength = 0; 277 result = NULL; 278 goto Exit; 279 } 280 } 281 282 result = convert( rec, memory ); 283 } 284 285 Exit: 286 *name = result; 287 return error; 288 } 289 290 291 static FT_Encoding sfnt_find_encoding(int platform_id,int encoding_id)292 sfnt_find_encoding( int platform_id, 293 int encoding_id ) 294 { 295 typedef struct TEncoding_ 296 { 297 int platform_id; 298 int encoding_id; 299 FT_Encoding encoding; 300 301 } TEncoding; 302 303 static 304 const TEncoding tt_encodings[] = 305 { 306 { TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE }, 307 308 { TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE }, 309 310 { TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN }, 311 312 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, FT_ENCODING_MS_SYMBOL }, 313 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UCS_4, FT_ENCODING_UNICODE }, 314 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, FT_ENCODING_UNICODE }, 315 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, FT_ENCODING_SJIS }, 316 { TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, FT_ENCODING_GB2312 }, 317 { TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, FT_ENCODING_BIG5 }, 318 { TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, FT_ENCODING_WANSUNG }, 319 { TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, FT_ENCODING_JOHAB } 320 }; 321 322 const TEncoding *cur, *limit; 323 324 325 cur = tt_encodings; 326 limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] ); 327 328 for ( ; cur < limit; cur++ ) 329 { 330 if ( cur->platform_id == platform_id ) 331 { 332 if ( cur->encoding_id == encoding_id || 333 cur->encoding_id == -1 ) 334 return cur->encoding; 335 } 336 } 337 338 return FT_ENCODING_NONE; 339 } 340 341 342 /* Fill in face->ttc_header. If the font is not a TTC, it is */ 343 /* synthesized into a TTC with one offset table. */ 344 static FT_Error sfnt_open_font(FT_Stream stream,TT_Face face)345 sfnt_open_font( FT_Stream stream, 346 TT_Face face ) 347 { 348 FT_Memory memory = stream->memory; 349 FT_Error error; 350 FT_ULong tag, offset; 351 352 static const FT_Frame_Field ttc_header_fields[] = 353 { 354 #undef FT_STRUCTURE 355 #define FT_STRUCTURE TTC_HeaderRec 356 357 FT_FRAME_START( 8 ), 358 FT_FRAME_LONG( version ), 359 FT_FRAME_LONG( count ), 360 FT_FRAME_END 361 }; 362 363 364 face->ttc_header.tag = 0; 365 face->ttc_header.version = 0; 366 face->ttc_header.count = 0; 367 368 offset = FT_STREAM_POS(); 369 370 if ( FT_READ_ULONG( tag ) ) 371 return error; 372 373 if ( tag != 0x00010000UL && 374 tag != TTAG_ttcf && 375 tag != TTAG_OTTO && 376 tag != TTAG_true && 377 tag != TTAG_typ1 && 378 tag != 0x00020000UL ) 379 return SFNT_Err_Unknown_File_Format; 380 381 face->ttc_header.tag = TTAG_ttcf; 382 383 if ( tag == TTAG_ttcf ) 384 { 385 FT_Int n; 386 387 388 FT_TRACE3(( "sfnt_open_font: file is a collection\n" )); 389 390 if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) ) 391 return error; 392 393 /* now read the offsets of each font in the file */ 394 if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) ) 395 return error; 396 397 if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) ) 398 return error; 399 400 for ( n = 0; n < face->ttc_header.count; n++ ) 401 face->ttc_header.offsets[n] = FT_GET_ULONG(); 402 403 FT_FRAME_EXIT(); 404 } 405 else 406 { 407 FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" )); 408 409 face->ttc_header.version = 1 << 16; 410 face->ttc_header.count = 1; 411 412 if ( FT_NEW( face->ttc_header.offsets ) ) 413 return error; 414 415 face->ttc_header.offsets[0] = offset; 416 } 417 418 return error; 419 } 420 421 422 FT_LOCAL_DEF( FT_Error ) sfnt_init_face(FT_Stream stream,TT_Face face,FT_Int face_index,FT_Int num_params,FT_Parameter * params)423 sfnt_init_face( FT_Stream stream, 424 TT_Face face, 425 FT_Int face_index, 426 FT_Int num_params, 427 FT_Parameter* params ) 428 { 429 FT_Error error; 430 FT_Library library = face->root.driver->root.library; 431 SFNT_Service sfnt; 432 433 434 /* for now, parameters are unused */ 435 FT_UNUSED( num_params ); 436 FT_UNUSED( params ); 437 438 439 sfnt = (SFNT_Service)face->sfnt; 440 if ( !sfnt ) 441 { 442 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); 443 if ( !sfnt ) 444 return SFNT_Err_Invalid_File_Format; 445 446 face->sfnt = sfnt; 447 face->goto_table = sfnt->goto_table; 448 } 449 450 FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS ); 451 452 error = sfnt_open_font( stream, face ); 453 if ( error ) 454 return error; 455 456 FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index )); 457 458 if ( face_index < 0 ) 459 face_index = 0; 460 461 if ( face_index >= face->ttc_header.count ) 462 return SFNT_Err_Invalid_Argument; 463 464 if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) ) 465 return error; 466 467 /* check that we have a valid TrueType file */ 468 error = sfnt->load_font_dir( face, stream ); 469 if ( error ) 470 return error; 471 472 face->root.num_faces = face->ttc_header.count; 473 face->root.face_index = face_index; 474 475 return error; 476 } 477 478 479 #define LOAD_( x ) \ 480 do { \ 481 FT_TRACE2(( "`" #x "' " )); \ 482 FT_TRACE3(( "-->\n" )); \ 483 \ 484 error = sfnt->load_##x( face, stream ); \ 485 \ 486 FT_TRACE2(( "%s\n", ( !error ) \ 487 ? "loaded" \ 488 : ( error == SFNT_Err_Table_Missing ) \ 489 ? "missing" \ 490 : "failed to load" )); \ 491 FT_TRACE3(( "\n" )); \ 492 } while ( 0 ) 493 494 #define LOADM_( x, vertical ) \ 495 do { \ 496 FT_TRACE2(( "`%s" #x "' ", \ 497 vertical ? "vertical " : "" )); \ 498 FT_TRACE3(( "-->\n" )); \ 499 \ 500 error = sfnt->load_##x( face, stream, vertical ); \ 501 \ 502 FT_TRACE2(( "%s\n", ( !error ) \ 503 ? "loaded" \ 504 : ( error == SFNT_Err_Table_Missing ) \ 505 ? "missing" \ 506 : "failed to load" )); \ 507 FT_TRACE3(( "\n" )); \ 508 } while ( 0 ) 509 510 #define GET_NAME( id, field ) \ 511 do { \ 512 error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \ 513 if ( error ) \ 514 goto Exit; \ 515 } while ( 0 ) 516 517 518 FT_LOCAL_DEF( FT_Error ) sfnt_load_face(FT_Stream stream,TT_Face face,FT_Int face_index,FT_Int num_params,FT_Parameter * params)519 sfnt_load_face( FT_Stream stream, 520 TT_Face face, 521 FT_Int face_index, 522 FT_Int num_params, 523 FT_Parameter* params ) 524 { 525 FT_Error error; 526 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 527 FT_Error psnames_error; 528 #endif 529 FT_Bool has_outline; 530 FT_Bool is_apple_sbit; 531 FT_Bool ignore_preferred_family = FALSE; 532 FT_Bool ignore_preferred_subfamily = FALSE; 533 534 SFNT_Service sfnt = (SFNT_Service)face->sfnt; 535 536 FT_UNUSED( face_index ); 537 538 /* Check parameters */ 539 540 { 541 FT_Int i; 542 543 544 for ( i = 0; i < num_params; i++ ) 545 { 546 if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY ) 547 ignore_preferred_family = TRUE; 548 else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY ) 549 ignore_preferred_subfamily = TRUE; 550 } 551 } 552 553 /* Load tables */ 554 555 /* We now support two SFNT-based bitmapped font formats. They */ 556 /* are recognized easily as they do not include a `glyf' */ 557 /* table. */ 558 /* */ 559 /* The first format comes from Apple, and uses a table named */ 560 /* `bhed' instead of `head' to store the font header (using */ 561 /* the same format). It also doesn't include horizontal and */ 562 /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */ 563 /* missing). */ 564 /* */ 565 /* The other format comes from Microsoft, and is used with */ 566 /* WinCE/PocketPC. It looks like a standard TTF, except that */ 567 /* it doesn't contain outlines. */ 568 /* */ 569 570 FT_TRACE2(( "sfnt_load_face: %08p\n\n", face )); 571 572 /* do we have outlines in there? */ 573 #ifdef FT_CONFIG_OPTION_INCREMENTAL 574 has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 || 575 tt_face_lookup_table( face, TTAG_glyf ) != 0 || 576 tt_face_lookup_table( face, TTAG_CFF ) != 0 ); 577 #else 578 has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 || 579 tt_face_lookup_table( face, TTAG_CFF ) != 0 ); 580 #endif 581 582 is_apple_sbit = 0; 583 584 /* if this font doesn't contain outlines, we try to load */ 585 /* a `bhed' table */ 586 if ( !has_outline && sfnt->load_bhed ) 587 { 588 LOAD_( bhed ); 589 is_apple_sbit = FT_BOOL( !error ); 590 } 591 592 /* load the font header (`head' table) if this isn't an Apple */ 593 /* sbit font file */ 594 if ( !is_apple_sbit ) 595 { 596 LOAD_( head ); 597 if ( error ) 598 goto Exit; 599 } 600 601 if ( face->header.Units_Per_EM == 0 ) 602 { 603 error = SFNT_Err_Invalid_Table; 604 605 goto Exit; 606 } 607 608 /* the following tables are often not present in embedded TrueType */ 609 /* fonts within PDF documents, so don't check for them. */ 610 LOAD_( maxp ); 611 LOAD_( cmap ); 612 613 /* the following tables are optional in PCL fonts -- */ 614 /* don't check for errors */ 615 LOAD_( name ); 616 LOAD_( post ); 617 618 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 619 psnames_error = error; 620 #endif 621 622 /* do not load the metrics headers and tables if this is an Apple */ 623 /* sbit font file */ 624 if ( !is_apple_sbit ) 625 { 626 /* load the `hhea' and `hmtx' tables */ 627 LOADM_( hhea, 0 ); 628 if ( !error ) 629 { 630 LOADM_( hmtx, 0 ); 631 if ( error == SFNT_Err_Table_Missing ) 632 { 633 error = SFNT_Err_Hmtx_Table_Missing; 634 635 #ifdef FT_CONFIG_OPTION_INCREMENTAL 636 /* If this is an incrementally loaded font and there are */ 637 /* overriding metrics, tolerate a missing `hmtx' table. */ 638 if ( face->root.internal->incremental_interface && 639 face->root.internal->incremental_interface->funcs-> 640 get_glyph_metrics ) 641 { 642 face->horizontal.number_Of_HMetrics = 0; 643 error = SFNT_Err_Ok; 644 } 645 #endif 646 } 647 } 648 else if ( error == SFNT_Err_Table_Missing ) 649 { 650 /* No `hhea' table necessary for SFNT Mac fonts. */ 651 if ( face->format_tag == TTAG_true ) 652 { 653 FT_TRACE2(( "This is an SFNT Mac font.\n" )); 654 has_outline = 0; 655 error = SFNT_Err_Ok; 656 } 657 else 658 { 659 error = SFNT_Err_Horiz_Header_Missing; 660 661 #ifdef FT_CONFIG_OPTION_INCREMENTAL 662 /* If this is an incrementally loaded font and there are */ 663 /* overriding metrics, tolerate a missing `hhea' table. */ 664 if ( face->root.internal->incremental_interface && 665 face->root.internal->incremental_interface->funcs-> 666 get_glyph_metrics ) 667 { 668 face->horizontal.number_Of_HMetrics = 0; 669 error = SFNT_Err_Ok; 670 } 671 #endif 672 673 } 674 } 675 676 if ( error ) 677 goto Exit; 678 679 /* try to load the `vhea' and `vmtx' tables */ 680 LOADM_( hhea, 1 ); 681 if ( !error ) 682 { 683 LOADM_( hmtx, 1 ); 684 if ( !error ) 685 face->vertical_info = 1; 686 } 687 688 if ( error && error != SFNT_Err_Table_Missing ) 689 goto Exit; 690 691 LOAD_( os2 ); 692 if ( error ) 693 { 694 if ( error != SFNT_Err_Table_Missing ) 695 goto Exit; 696 697 face->os2.version = 0xFFFFU; 698 } 699 } 700 701 /* the optional tables */ 702 703 /* embedded bitmap support */ 704 if ( sfnt->load_eblc ) 705 { 706 LOAD_( eblc ); 707 if ( error ) 708 { 709 /* a font which contains neither bitmaps nor outlines is */ 710 /* still valid (although rather useless in most cases); */ 711 /* however, you can find such stripped fonts in PDFs */ 712 if ( error == SFNT_Err_Table_Missing ) 713 error = SFNT_Err_Ok; 714 else 715 goto Exit; 716 } 717 } 718 719 LOAD_( pclt ); 720 if ( error ) 721 { 722 if ( error != SFNT_Err_Table_Missing ) 723 goto Exit; 724 725 face->pclt.Version = 0; 726 } 727 728 /* consider the kerning and gasp tables as optional */ 729 LOAD_( gasp ); 730 LOAD_( kern ); 731 732 face->root.num_glyphs = face->max_profile.numGlyphs; 733 734 /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */ 735 /* a WWS-only font face. `WWS' stands for `weight', width', and */ 736 /* `slope', a term used by Microsoft's Windows Presentation */ 737 /* Foundation (WPF). This flag has been introduced in version */ 738 /* 1.5 of the OpenType specification (May 2008). */ 739 740 face->root.family_name = NULL; 741 face->root.style_name = NULL; 742 if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 ) 743 { 744 if ( !ignore_preferred_family ) 745 GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); 746 if ( !face->root.family_name ) 747 GET_NAME( FONT_FAMILY, &face->root.family_name ); 748 749 if ( !ignore_preferred_subfamily ) 750 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); 751 if ( !face->root.style_name ) 752 GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); 753 } 754 else 755 { 756 GET_NAME( WWS_FAMILY, &face->root.family_name ); 757 if ( !face->root.family_name && !ignore_preferred_family ) 758 GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); 759 if ( !face->root.family_name ) 760 GET_NAME( FONT_FAMILY, &face->root.family_name ); 761 762 GET_NAME( WWS_SUBFAMILY, &face->root.style_name ); 763 if ( !face->root.style_name && !ignore_preferred_subfamily ) 764 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); 765 if ( !face->root.style_name ) 766 GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); 767 } 768 769 /* now set up root fields */ 770 { 771 FT_Face root = &face->root; 772 FT_Long flags = root->face_flags; 773 774 775 /*********************************************************************/ 776 /* */ 777 /* Compute face flags. */ 778 /* */ 779 if ( has_outline == TRUE ) 780 flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */ 781 782 /* The sfnt driver only supports bitmap fonts natively, thus we */ 783 /* don't set FT_FACE_FLAG_HINTER. */ 784 flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */ 785 FT_FACE_FLAG_HORIZONTAL; /* horizontal data */ 786 787 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 788 if ( psnames_error == SFNT_Err_Ok && 789 face->postscript.FormatType != 0x00030000L ) 790 flags |= FT_FACE_FLAG_GLYPH_NAMES; 791 #endif 792 793 /* fixed width font? */ 794 if ( face->postscript.isFixedPitch ) 795 flags |= FT_FACE_FLAG_FIXED_WIDTH; 796 797 /* vertical information? */ 798 if ( face->vertical_info ) 799 flags |= FT_FACE_FLAG_VERTICAL; 800 801 /* kerning available ? */ 802 if ( TT_FACE_HAS_KERNING( face ) ) 803 flags |= FT_FACE_FLAG_KERNING; 804 805 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 806 /* Don't bother to load the tables unless somebody asks for them. */ 807 /* No need to do work which will (probably) not be used. */ 808 if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 && 809 tt_face_lookup_table( face, TTAG_fvar ) != 0 && 810 tt_face_lookup_table( face, TTAG_gvar ) != 0 ) 811 flags |= FT_FACE_FLAG_MULTIPLE_MASTERS; 812 #endif 813 814 root->face_flags = flags; 815 816 /*********************************************************************/ 817 /* */ 818 /* Compute style flags. */ 819 /* */ 820 821 flags = 0; 822 if ( has_outline == TRUE && face->os2.version != 0xFFFFU ) 823 { 824 /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */ 825 /* indicates an oblique font face. This flag has been */ 826 /* introduced in version 1.5 of the OpenType specification. */ 827 828 if ( face->os2.fsSelection & 512 ) /* bit 9 */ 829 flags |= FT_STYLE_FLAG_ITALIC; 830 else if ( face->os2.fsSelection & 1 ) /* bit 0 */ 831 flags |= FT_STYLE_FLAG_ITALIC; 832 833 if ( face->os2.fsSelection & 32 ) /* bit 5 */ 834 flags |= FT_STYLE_FLAG_BOLD; 835 } 836 else 837 { 838 /* this is an old Mac font, use the header field */ 839 840 if ( face->header.Mac_Style & 1 ) 841 flags |= FT_STYLE_FLAG_BOLD; 842 843 if ( face->header.Mac_Style & 2 ) 844 flags |= FT_STYLE_FLAG_ITALIC; 845 } 846 847 root->style_flags = flags; 848 849 /*********************************************************************/ 850 /* */ 851 /* Polish the charmaps. */ 852 /* */ 853 /* Try to set the charmap encoding according to the platform & */ 854 /* encoding ID of each charmap. */ 855 /* */ 856 857 tt_face_build_cmaps( face ); /* ignore errors */ 858 859 860 /* set the encoding fields */ 861 { 862 FT_Int m; 863 864 865 for ( m = 0; m < root->num_charmaps; m++ ) 866 { 867 FT_CharMap charmap = root->charmaps[m]; 868 869 870 charmap->encoding = sfnt_find_encoding( charmap->platform_id, 871 charmap->encoding_id ); 872 873 #if 0 874 if ( root->charmap == NULL && 875 charmap->encoding == FT_ENCODING_UNICODE ) 876 { 877 /* set 'root->charmap' to the first Unicode encoding we find */ 878 root->charmap = charmap; 879 } 880 #endif 881 } 882 } 883 884 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 885 886 /* 887 * Now allocate the root array of FT_Bitmap_Size records and 888 * populate them. Unfortunately, it isn't possible to indicate bit 889 * depths in the FT_Bitmap_Size record. This is a design error. 890 */ 891 { 892 FT_UInt i, count; 893 894 895 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS 896 count = face->sbit_num_strikes; 897 #else 898 count = (FT_UInt)face->num_sbit_strikes; 899 #endif 900 901 if ( count > 0 ) 902 { 903 FT_Memory memory = face->root.stream->memory; 904 FT_UShort em_size = face->header.Units_Per_EM; 905 FT_Short avgwidth = face->os2.xAvgCharWidth; 906 FT_Size_Metrics metrics; 907 908 909 if ( em_size == 0 || face->os2.version == 0xFFFFU ) 910 { 911 avgwidth = 0; 912 em_size = 1; 913 } 914 915 if ( FT_NEW_ARRAY( root->available_sizes, count ) ) 916 goto Exit; 917 918 for ( i = 0; i < count; i++ ) 919 { 920 FT_Bitmap_Size* bsize = root->available_sizes + i; 921 922 923 error = sfnt->load_strike_metrics( face, i, &metrics ); 924 if ( error ) 925 goto Exit; 926 927 bsize->height = (FT_Short)( metrics.height >> 6 ); 928 bsize->width = (FT_Short)( 929 ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size ); 930 931 bsize->x_ppem = metrics.x_ppem << 6; 932 bsize->y_ppem = metrics.y_ppem << 6; 933 934 /* assume 72dpi */ 935 bsize->size = metrics.y_ppem << 6; 936 } 937 938 root->face_flags |= FT_FACE_FLAG_FIXED_SIZES; 939 root->num_fixed_sizes = (FT_Int)count; 940 } 941 } 942 943 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 944 945 /* a font with no bitmaps and no outlines is scalable; */ 946 /* it has only empty glyphs then */ 947 if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) ) 948 root->face_flags |= FT_FACE_FLAG_SCALABLE; 949 950 951 /*********************************************************************/ 952 /* */ 953 /* Set up metrics. */ 954 /* */ 955 if ( FT_IS_SCALABLE( root ) ) 956 { 957 /* XXX What about if outline header is missing */ 958 /* (e.g. sfnt wrapped bitmap)? */ 959 root->bbox.xMin = face->header.xMin; 960 root->bbox.yMin = face->header.yMin; 961 root->bbox.xMax = face->header.xMax; 962 root->bbox.yMax = face->header.yMax; 963 root->units_per_EM = face->header.Units_Per_EM; 964 965 966 /* XXX: Computing the ascender/descender/height is very different */ 967 /* from what the specification tells you. Apparently, we */ 968 /* must be careful because */ 969 /* */ 970 /* - not all fonts have an OS/2 table; in this case, we take */ 971 /* the values in the horizontal header. However, these */ 972 /* values very often are not reliable. */ 973 /* */ 974 /* - otherwise, the correct typographic values are in the */ 975 /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */ 976 /* */ 977 /* However, certain fonts have these fields set to 0. */ 978 /* Rather, they have usWinAscent & usWinDescent correctly */ 979 /* set (but with different values). */ 980 /* */ 981 /* As an example, Arial Narrow is implemented through four */ 982 /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */ 983 /* */ 984 /* Strangely, all fonts have the same values in their */ 985 /* sTypoXXX fields, except ARIALNB which sets them to 0. */ 986 /* */ 987 /* On the other hand, they all have different */ 988 /* usWinAscent/Descent values -- as a conclusion, the OS/2 */ 989 /* table cannot be used to compute the text height reliably! */ 990 /* */ 991 992 /* The ascender/descender/height are computed from the OS/2 table */ 993 /* when found. Otherwise, they're taken from the horizontal */ 994 /* header. */ 995 /* */ 996 997 root->ascender = face->horizontal.Ascender; 998 root->descender = face->horizontal.Descender; 999 1000 root->height = (FT_Short)( root->ascender - root->descender + 1001 face->horizontal.Line_Gap ); 1002 1003 #if 0 1004 /* if the line_gap is 0, we add an extra 15% to the text height -- */ 1005 /* this computation is based on various versions of Times New Roman */ 1006 if ( face->horizontal.Line_Gap == 0 ) 1007 root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 ); 1008 #endif /* 0 */ 1009 1010 #if 0 1011 /* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */ 1012 /* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */ 1013 if ( face->os2.version != 0xFFFFU && root->ascender ) 1014 { 1015 FT_Int height; 1016 1017 1018 root->ascender = face->os2.sTypoAscender; 1019 root->descender = -face->os2.sTypoDescender; 1020 1021 height = root->ascender + root->descender + face->os2.sTypoLineGap; 1022 if ( height > root->height ) 1023 root->height = height; 1024 } 1025 #endif /* 0 */ 1026 1027 root->max_advance_width = face->horizontal.advance_Width_Max; 1028 root->max_advance_height = (FT_Short)( face->vertical_info 1029 ? face->vertical.advance_Height_Max 1030 : root->height ); 1031 1032 /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */ 1033 /* Adjust underline position from top edge to centre of */ 1034 /* stroke to convert TrueType meaning to FreeType meaning. */ 1035 root->underline_position = face->postscript.underlinePosition - 1036 face->postscript.underlineThickness / 2; 1037 root->underline_thickness = face->postscript.underlineThickness; 1038 } 1039 1040 } 1041 1042 Exit: 1043 FT_TRACE2(( "sfnt_load_face: done\n" )); 1044 1045 return error; 1046 } 1047 1048 1049 #undef LOAD_ 1050 #undef LOADM_ 1051 #undef GET_NAME 1052 1053 1054 FT_LOCAL_DEF( void ) sfnt_done_face(TT_Face face)1055 sfnt_done_face( TT_Face face ) 1056 { 1057 FT_Memory memory; 1058 SFNT_Service sfnt; 1059 1060 1061 if ( !face ) 1062 return; 1063 1064 memory = face->root.memory; 1065 sfnt = (SFNT_Service)face->sfnt; 1066 1067 if ( sfnt ) 1068 { 1069 /* destroy the postscript names table if it is loaded */ 1070 if ( sfnt->free_psnames ) 1071 sfnt->free_psnames( face ); 1072 1073 /* destroy the embedded bitmaps table if it is loaded */ 1074 if ( sfnt->free_eblc ) 1075 sfnt->free_eblc( face ); 1076 } 1077 1078 #ifdef TT_CONFIG_OPTION_BDF 1079 /* freeing the embedded BDF properties */ 1080 tt_face_free_bdf_props( face ); 1081 #endif 1082 1083 /* freeing the kerning table */ 1084 tt_face_done_kern( face ); 1085 1086 /* freeing the collection table */ 1087 FT_FREE( face->ttc_header.offsets ); 1088 face->ttc_header.count = 0; 1089 1090 /* freeing table directory */ 1091 FT_FREE( face->dir_tables ); 1092 face->num_tables = 0; 1093 1094 { 1095 FT_Stream stream = FT_FACE_STREAM( face ); 1096 1097 1098 /* simply release the 'cmap' table frame */ 1099 FT_FRAME_RELEASE( face->cmap_table ); 1100 face->cmap_size = 0; 1101 } 1102 1103 /* freeing the horizontal metrics */ 1104 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS 1105 { 1106 FT_Stream stream = FT_FACE_STREAM( face ); 1107 1108 1109 FT_FRAME_RELEASE( face->horz_metrics ); 1110 FT_FRAME_RELEASE( face->vert_metrics ); 1111 face->horz_metrics_size = 0; 1112 face->vert_metrics_size = 0; 1113 } 1114 #else 1115 FT_FREE( face->horizontal.long_metrics ); 1116 FT_FREE( face->horizontal.short_metrics ); 1117 #endif 1118 1119 /* freeing the vertical ones, if any */ 1120 if ( face->vertical_info ) 1121 { 1122 FT_FREE( face->vertical.long_metrics ); 1123 FT_FREE( face->vertical.short_metrics ); 1124 face->vertical_info = 0; 1125 } 1126 1127 /* freeing the gasp table */ 1128 FT_FREE( face->gasp.gaspRanges ); 1129 face->gasp.numRanges = 0; 1130 1131 /* freeing the name table */ 1132 if ( sfnt ) 1133 sfnt->free_name( face ); 1134 1135 /* freeing family and style name */ 1136 FT_FREE( face->root.family_name ); 1137 FT_FREE( face->root.style_name ); 1138 1139 /* freeing sbit size table */ 1140 FT_FREE( face->root.available_sizes ); 1141 face->root.num_fixed_sizes = 0; 1142 1143 FT_FREE( face->postscript_name ); 1144 1145 face->sfnt = 0; 1146 } 1147 1148 1149 /* END */ 1150