1 /***************************************************************************/ 2 /* */ 3 /* sfobjs.c */ 4 /* */ 5 /* SFNT object management (base). */ 6 /* */ 7 /* Copyright 1996-2008, 2010-2011 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 = 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 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 = NULL; 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 ), /* this is ULong in the specs */ 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 if ( face->ttc_header.count == 0 ) 394 return SFNT_Err_Invalid_Table; 395 396 /* a rough size estimate: let's conservatively assume that there */ 397 /* is just a single table info in each subfont header (12 + 16*1 = */ 398 /* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */ 399 /* size of the TTC header plus `28*count' bytes for all subfont */ 400 /* headers */ 401 if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) ) 402 return SFNT_Err_Array_Too_Large; 403 404 /* now read the offsets of each font in the file */ 405 if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) ) 406 return error; 407 408 if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) ) 409 return error; 410 411 for ( n = 0; n < face->ttc_header.count; n++ ) 412 face->ttc_header.offsets[n] = FT_GET_ULONG(); 413 414 FT_FRAME_EXIT(); 415 } 416 else 417 { 418 FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" )); 419 420 face->ttc_header.version = 1 << 16; 421 face->ttc_header.count = 1; 422 423 if ( FT_NEW( face->ttc_header.offsets ) ) 424 return error; 425 426 face->ttc_header.offsets[0] = offset; 427 } 428 429 return error; 430 } 431 432 433 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)434 sfnt_init_face( FT_Stream stream, 435 TT_Face face, 436 FT_Int face_index, 437 FT_Int num_params, 438 FT_Parameter* params ) 439 { 440 FT_Error error; 441 FT_Library library = face->root.driver->root.library; 442 SFNT_Service sfnt; 443 444 445 /* for now, parameters are unused */ 446 FT_UNUSED( num_params ); 447 FT_UNUSED( params ); 448 449 450 sfnt = (SFNT_Service)face->sfnt; 451 if ( !sfnt ) 452 { 453 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); 454 if ( !sfnt ) 455 return SFNT_Err_Invalid_File_Format; 456 457 face->sfnt = sfnt; 458 face->goto_table = sfnt->goto_table; 459 } 460 461 FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS ); 462 463 error = sfnt_open_font( stream, face ); 464 if ( error ) 465 return error; 466 467 FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index )); 468 469 if ( face_index < 0 ) 470 face_index = 0; 471 472 if ( face_index >= face->ttc_header.count ) 473 return SFNT_Err_Invalid_Argument; 474 475 if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) ) 476 return error; 477 478 /* check that we have a valid TrueType file */ 479 error = sfnt->load_font_dir( face, stream ); 480 if ( error ) 481 return error; 482 483 face->root.num_faces = face->ttc_header.count; 484 face->root.face_index = face_index; 485 486 return error; 487 } 488 489 490 #define LOAD_( x ) \ 491 do { \ 492 FT_TRACE2(( "`" #x "' " )); \ 493 FT_TRACE3(( "-->\n" )); \ 494 \ 495 error = sfnt->load_##x( face, stream ); \ 496 \ 497 FT_TRACE2(( "%s\n", ( !error ) \ 498 ? "loaded" \ 499 : ( error == SFNT_Err_Table_Missing ) \ 500 ? "missing" \ 501 : "failed to load" )); \ 502 FT_TRACE3(( "\n" )); \ 503 } while ( 0 ) 504 505 #define LOADM_( x, vertical ) \ 506 do { \ 507 FT_TRACE2(( "`%s" #x "' ", \ 508 vertical ? "vertical " : "" )); \ 509 FT_TRACE3(( "-->\n" )); \ 510 \ 511 error = sfnt->load_##x( face, stream, vertical ); \ 512 \ 513 FT_TRACE2(( "%s\n", ( !error ) \ 514 ? "loaded" \ 515 : ( error == SFNT_Err_Table_Missing ) \ 516 ? "missing" \ 517 : "failed to load" )); \ 518 FT_TRACE3(( "\n" )); \ 519 } while ( 0 ) 520 521 #define GET_NAME( id, field ) \ 522 do { \ 523 error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \ 524 if ( error ) \ 525 goto Exit; \ 526 } while ( 0 ) 527 528 529 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)530 sfnt_load_face( FT_Stream stream, 531 TT_Face face, 532 FT_Int face_index, 533 FT_Int num_params, 534 FT_Parameter* params ) 535 { 536 FT_Error error; 537 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 538 FT_Error psnames_error; 539 #endif 540 FT_Bool has_outline; 541 FT_Bool is_apple_sbit; 542 FT_Bool ignore_preferred_family = FALSE; 543 FT_Bool ignore_preferred_subfamily = FALSE; 544 545 SFNT_Service sfnt = (SFNT_Service)face->sfnt; 546 547 FT_UNUSED( face_index ); 548 549 /* Check parameters */ 550 551 { 552 FT_Int i; 553 554 555 for ( i = 0; i < num_params; i++ ) 556 { 557 if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY ) 558 ignore_preferred_family = TRUE; 559 else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY ) 560 ignore_preferred_subfamily = TRUE; 561 } 562 } 563 564 /* Load tables */ 565 566 /* We now support two SFNT-based bitmapped font formats. They */ 567 /* are recognized easily as they do not include a `glyf' */ 568 /* table. */ 569 /* */ 570 /* The first format comes from Apple, and uses a table named */ 571 /* `bhed' instead of `head' to store the font header (using */ 572 /* the same format). It also doesn't include horizontal and */ 573 /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */ 574 /* missing). */ 575 /* */ 576 /* The other format comes from Microsoft, and is used with */ 577 /* WinCE/PocketPC. It looks like a standard TTF, except that */ 578 /* it doesn't contain outlines. */ 579 /* */ 580 581 FT_TRACE2(( "sfnt_load_face: %08p\n\n", face )); 582 583 /* do we have outlines in there? */ 584 #ifdef FT_CONFIG_OPTION_INCREMENTAL 585 has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 || 586 tt_face_lookup_table( face, TTAG_glyf ) != 0 || 587 tt_face_lookup_table( face, TTAG_CFF ) != 0 ); 588 #else 589 has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 || 590 tt_face_lookup_table( face, TTAG_CFF ) != 0 ); 591 #endif 592 593 is_apple_sbit = 0; 594 595 /* if this font doesn't contain outlines, we try to load */ 596 /* a `bhed' table */ 597 if ( !has_outline && sfnt->load_bhed ) 598 { 599 LOAD_( bhed ); 600 is_apple_sbit = FT_BOOL( !error ); 601 } 602 603 /* load the font header (`head' table) if this isn't an Apple */ 604 /* sbit font file */ 605 if ( !is_apple_sbit ) 606 { 607 LOAD_( head ); 608 if ( error ) 609 goto Exit; 610 } 611 612 if ( face->header.Units_Per_EM == 0 ) 613 { 614 error = SFNT_Err_Invalid_Table; 615 616 goto Exit; 617 } 618 619 /* the following tables are often not present in embedded TrueType */ 620 /* fonts within PDF documents, so don't check for them. */ 621 LOAD_( maxp ); 622 LOAD_( cmap ); 623 624 /* the following tables are optional in PCL fonts -- */ 625 /* don't check for errors */ 626 LOAD_( name ); 627 LOAD_( post ); 628 629 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 630 psnames_error = error; 631 #endif 632 633 /* do not load the metrics headers and tables if this is an Apple */ 634 /* sbit font file */ 635 if ( !is_apple_sbit ) 636 { 637 /* load the `hhea' and `hmtx' tables */ 638 LOADM_( hhea, 0 ); 639 if ( !error ) 640 { 641 LOADM_( hmtx, 0 ); 642 if ( error == SFNT_Err_Table_Missing ) 643 { 644 error = SFNT_Err_Hmtx_Table_Missing; 645 646 #ifdef FT_CONFIG_OPTION_INCREMENTAL 647 /* If this is an incrementally loaded font and there are */ 648 /* overriding metrics, tolerate a missing `hmtx' table. */ 649 if ( face->root.internal->incremental_interface && 650 face->root.internal->incremental_interface->funcs-> 651 get_glyph_metrics ) 652 { 653 face->horizontal.number_Of_HMetrics = 0; 654 error = SFNT_Err_Ok; 655 } 656 #endif 657 } 658 } 659 else if ( error == SFNT_Err_Table_Missing ) 660 { 661 /* No `hhea' table necessary for SFNT Mac fonts. */ 662 if ( face->format_tag == TTAG_true ) 663 { 664 FT_TRACE2(( "This is an SFNT Mac font.\n" )); 665 666 has_outline = 0; 667 error = SFNT_Err_Ok; 668 } 669 else 670 { 671 error = SFNT_Err_Horiz_Header_Missing; 672 673 #ifdef FT_CONFIG_OPTION_INCREMENTAL 674 /* If this is an incrementally loaded font and there are */ 675 /* overriding metrics, tolerate a missing `hhea' table. */ 676 if ( face->root.internal->incremental_interface && 677 face->root.internal->incremental_interface->funcs-> 678 get_glyph_metrics ) 679 { 680 face->horizontal.number_Of_HMetrics = 0; 681 error = SFNT_Err_Ok; 682 } 683 #endif 684 685 } 686 } 687 688 if ( error ) 689 goto Exit; 690 691 /* try to load the `vhea' and `vmtx' tables */ 692 LOADM_( hhea, 1 ); 693 if ( !error ) 694 { 695 LOADM_( hmtx, 1 ); 696 if ( !error ) 697 face->vertical_info = 1; 698 } 699 700 if ( error && error != SFNT_Err_Table_Missing ) 701 goto Exit; 702 703 LOAD_( os2 ); 704 if ( error ) 705 { 706 /* we treat the table as missing if there are any errors */ 707 face->os2.version = 0xFFFFU; 708 } 709 } 710 711 /* the optional tables */ 712 713 /* embedded bitmap support */ 714 if ( sfnt->load_eblc ) 715 { 716 LOAD_( eblc ); 717 if ( error ) 718 { 719 /* a font which contains neither bitmaps nor outlines is */ 720 /* still valid (although rather useless in most cases); */ 721 /* however, you can find such stripped fonts in PDFs */ 722 if ( error == SFNT_Err_Table_Missing ) 723 error = SFNT_Err_Ok; 724 else 725 goto Exit; 726 } 727 } 728 729 LOAD_( pclt ); 730 if ( error ) 731 { 732 if ( error != SFNT_Err_Table_Missing ) 733 goto Exit; 734 735 face->pclt.Version = 0; 736 } 737 738 /* consider the kerning and gasp tables as optional */ 739 LOAD_( gasp ); 740 LOAD_( kern ); 741 742 face->root.num_glyphs = face->max_profile.numGlyphs; 743 744 /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */ 745 /* a WWS-only font face. `WWS' stands for `weight', width', and */ 746 /* `slope', a term used by Microsoft's Windows Presentation */ 747 /* Foundation (WPF). This flag has been introduced in version */ 748 /* 1.5 of the OpenType specification (May 2008). */ 749 750 face->root.family_name = NULL; 751 face->root.style_name = NULL; 752 if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 ) 753 { 754 if ( !ignore_preferred_family ) 755 GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); 756 if ( !face->root.family_name ) 757 GET_NAME( FONT_FAMILY, &face->root.family_name ); 758 759 if ( !ignore_preferred_subfamily ) 760 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); 761 if ( !face->root.style_name ) 762 GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); 763 } 764 else 765 { 766 GET_NAME( WWS_FAMILY, &face->root.family_name ); 767 if ( !face->root.family_name && !ignore_preferred_family ) 768 GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); 769 if ( !face->root.family_name ) 770 GET_NAME( FONT_FAMILY, &face->root.family_name ); 771 772 GET_NAME( WWS_SUBFAMILY, &face->root.style_name ); 773 if ( !face->root.style_name && !ignore_preferred_subfamily ) 774 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); 775 if ( !face->root.style_name ) 776 GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); 777 } 778 779 /* now set up root fields */ 780 { 781 FT_Face root = &face->root; 782 FT_Long flags = root->face_flags; 783 784 785 /*********************************************************************/ 786 /* */ 787 /* Compute face flags. */ 788 /* */ 789 if ( has_outline == TRUE ) 790 flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */ 791 792 /* The sfnt driver only supports bitmap fonts natively, thus we */ 793 /* don't set FT_FACE_FLAG_HINTER. */ 794 flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */ 795 FT_FACE_FLAG_HORIZONTAL; /* horizontal data */ 796 797 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES 798 if ( psnames_error == SFNT_Err_Ok && 799 face->postscript.FormatType != 0x00030000L ) 800 flags |= FT_FACE_FLAG_GLYPH_NAMES; 801 #endif 802 803 /* fixed width font? */ 804 if ( face->postscript.isFixedPitch ) 805 flags |= FT_FACE_FLAG_FIXED_WIDTH; 806 807 /* vertical information? */ 808 if ( face->vertical_info ) 809 flags |= FT_FACE_FLAG_VERTICAL; 810 811 /* kerning available ? */ 812 if ( TT_FACE_HAS_KERNING( face ) ) 813 flags |= FT_FACE_FLAG_KERNING; 814 815 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 816 /* Don't bother to load the tables unless somebody asks for them. */ 817 /* No need to do work which will (probably) not be used. */ 818 if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 && 819 tt_face_lookup_table( face, TTAG_fvar ) != 0 && 820 tt_face_lookup_table( face, TTAG_gvar ) != 0 ) 821 flags |= FT_FACE_FLAG_MULTIPLE_MASTERS; 822 #endif 823 824 root->face_flags = flags; 825 826 /*********************************************************************/ 827 /* */ 828 /* Compute style flags. */ 829 /* */ 830 831 flags = 0; 832 if ( has_outline == TRUE && face->os2.version != 0xFFFFU ) 833 { 834 /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */ 835 /* indicates an oblique font face. This flag has been */ 836 /* introduced in version 1.5 of the OpenType specification. */ 837 838 if ( face->os2.fsSelection & 512 ) /* bit 9 */ 839 flags |= FT_STYLE_FLAG_ITALIC; 840 else if ( face->os2.fsSelection & 1 ) /* bit 0 */ 841 flags |= FT_STYLE_FLAG_ITALIC; 842 843 if ( face->os2.fsSelection & 32 ) /* bit 5 */ 844 flags |= FT_STYLE_FLAG_BOLD; 845 } 846 else 847 { 848 /* this is an old Mac font, use the header field */ 849 850 if ( face->header.Mac_Style & 1 ) 851 flags |= FT_STYLE_FLAG_BOLD; 852 853 if ( face->header.Mac_Style & 2 ) 854 flags |= FT_STYLE_FLAG_ITALIC; 855 } 856 857 root->style_flags = flags; 858 859 /*********************************************************************/ 860 /* */ 861 /* Polish the charmaps. */ 862 /* */ 863 /* Try to set the charmap encoding according to the platform & */ 864 /* encoding ID of each charmap. */ 865 /* */ 866 867 tt_face_build_cmaps( face ); /* ignore errors */ 868 869 870 /* set the encoding fields */ 871 { 872 FT_Int m; 873 874 875 for ( m = 0; m < root->num_charmaps; m++ ) 876 { 877 FT_CharMap charmap = root->charmaps[m]; 878 879 880 charmap->encoding = sfnt_find_encoding( charmap->platform_id, 881 charmap->encoding_id ); 882 883 #if 0 884 if ( root->charmap == NULL && 885 charmap->encoding == FT_ENCODING_UNICODE ) 886 { 887 /* set 'root->charmap' to the first Unicode encoding we find */ 888 root->charmap = charmap; 889 } 890 #endif 891 } 892 } 893 894 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 895 896 /* 897 * Now allocate the root array of FT_Bitmap_Size records and 898 * populate them. Unfortunately, it isn't possible to indicate bit 899 * depths in the FT_Bitmap_Size record. This is a design error. 900 */ 901 { 902 FT_UInt i, count; 903 904 905 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS 906 count = face->sbit_num_strikes; 907 #else 908 count = (FT_UInt)face->num_sbit_strikes; 909 #endif 910 911 if ( count > 0 ) 912 { 913 FT_Memory memory = face->root.stream->memory; 914 FT_UShort em_size = face->header.Units_Per_EM; 915 FT_Short avgwidth = face->os2.xAvgCharWidth; 916 FT_Size_Metrics metrics; 917 918 919 if ( em_size == 0 || face->os2.version == 0xFFFFU ) 920 { 921 avgwidth = 0; 922 em_size = 1; 923 } 924 925 if ( FT_NEW_ARRAY( root->available_sizes, count ) ) 926 goto Exit; 927 928 for ( i = 0; i < count; i++ ) 929 { 930 FT_Bitmap_Size* bsize = root->available_sizes + i; 931 932 933 error = sfnt->load_strike_metrics( face, i, &metrics ); 934 if ( error ) 935 goto Exit; 936 937 bsize->height = (FT_Short)( metrics.height >> 6 ); 938 bsize->width = (FT_Short)( 939 ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size ); 940 941 bsize->x_ppem = metrics.x_ppem << 6; 942 bsize->y_ppem = metrics.y_ppem << 6; 943 944 /* assume 72dpi */ 945 bsize->size = metrics.y_ppem << 6; 946 } 947 948 root->face_flags |= FT_FACE_FLAG_FIXED_SIZES; 949 root->num_fixed_sizes = (FT_Int)count; 950 } 951 } 952 953 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 954 955 /* a font with no bitmaps and no outlines is scalable; */ 956 /* it has only empty glyphs then */ 957 if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) ) 958 root->face_flags |= FT_FACE_FLAG_SCALABLE; 959 960 961 /*********************************************************************/ 962 /* */ 963 /* Set up metrics. */ 964 /* */ 965 if ( FT_IS_SCALABLE( root ) ) 966 { 967 /* XXX What about if outline header is missing */ 968 /* (e.g. sfnt wrapped bitmap)? */ 969 root->bbox.xMin = face->header.xMin; 970 root->bbox.yMin = face->header.yMin; 971 root->bbox.xMax = face->header.xMax; 972 root->bbox.yMax = face->header.yMax; 973 root->units_per_EM = face->header.Units_Per_EM; 974 975 976 /* XXX: Computing the ascender/descender/height is very different */ 977 /* from what the specification tells you. Apparently, we */ 978 /* must be careful because */ 979 /* */ 980 /* - not all fonts have an OS/2 table; in this case, we take */ 981 /* the values in the horizontal header. However, these */ 982 /* values very often are not reliable. */ 983 /* */ 984 /* - otherwise, the correct typographic values are in the */ 985 /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */ 986 /* */ 987 /* However, certain fonts have these fields set to 0. */ 988 /* Rather, they have usWinAscent & usWinDescent correctly */ 989 /* set (but with different values). */ 990 /* */ 991 /* As an example, Arial Narrow is implemented through four */ 992 /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */ 993 /* */ 994 /* Strangely, all fonts have the same values in their */ 995 /* sTypoXXX fields, except ARIALNB which sets them to 0. */ 996 /* */ 997 /* On the other hand, they all have different */ 998 /* usWinAscent/Descent values -- as a conclusion, the OS/2 */ 999 /* table cannot be used to compute the text height reliably! */ 1000 /* */ 1001 1002 /* The ascender and descender are taken from the `hhea' table. */ 1003 /* If zero, they are taken from the `OS/2' table. */ 1004 1005 root->ascender = face->horizontal.Ascender; 1006 root->descender = face->horizontal.Descender; 1007 1008 root->height = (FT_Short)( root->ascender - root->descender + 1009 face->horizontal.Line_Gap ); 1010 1011 if ( !( root->ascender || root->descender ) ) 1012 { 1013 if ( face->os2.version != 0xFFFFU ) 1014 { 1015 if ( face->os2.sTypoAscender || face->os2.sTypoDescender ) 1016 { 1017 root->ascender = face->os2.sTypoAscender; 1018 root->descender = face->os2.sTypoDescender; 1019 1020 root->height = (FT_Short)( root->ascender - root->descender + 1021 face->os2.sTypoLineGap ); 1022 } 1023 else 1024 { 1025 root->ascender = (FT_Short)face->os2.usWinAscent; 1026 root->descender = -(FT_Short)face->os2.usWinDescent; 1027 1028 root->height = (FT_UShort)( root->ascender - root->descender ); 1029 } 1030 } 1031 } 1032 1033 root->max_advance_width = face->horizontal.advance_Width_Max; 1034 root->max_advance_height = (FT_Short)( face->vertical_info 1035 ? face->vertical.advance_Height_Max 1036 : root->height ); 1037 1038 /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */ 1039 /* Adjust underline position from top edge to centre of */ 1040 /* stroke to convert TrueType meaning to FreeType meaning. */ 1041 root->underline_position = face->postscript.underlinePosition - 1042 face->postscript.underlineThickness / 2; 1043 root->underline_thickness = face->postscript.underlineThickness; 1044 } 1045 1046 } 1047 1048 Exit: 1049 FT_TRACE2(( "sfnt_load_face: done\n" )); 1050 1051 return error; 1052 } 1053 1054 1055 #undef LOAD_ 1056 #undef LOADM_ 1057 #undef GET_NAME 1058 1059 1060 FT_LOCAL_DEF( void ) sfnt_done_face(TT_Face face)1061 sfnt_done_face( TT_Face face ) 1062 { 1063 FT_Memory memory; 1064 SFNT_Service sfnt; 1065 1066 1067 if ( !face ) 1068 return; 1069 1070 memory = face->root.memory; 1071 sfnt = (SFNT_Service)face->sfnt; 1072 1073 if ( sfnt ) 1074 { 1075 /* destroy the postscript names table if it is loaded */ 1076 if ( sfnt->free_psnames ) 1077 sfnt->free_psnames( face ); 1078 1079 /* destroy the embedded bitmaps table if it is loaded */ 1080 if ( sfnt->free_eblc ) 1081 sfnt->free_eblc( face ); 1082 } 1083 1084 #ifdef TT_CONFIG_OPTION_BDF 1085 /* freeing the embedded BDF properties */ 1086 tt_face_free_bdf_props( face ); 1087 #endif 1088 1089 /* freeing the kerning table */ 1090 tt_face_done_kern( face ); 1091 1092 /* freeing the collection table */ 1093 FT_FREE( face->ttc_header.offsets ); 1094 face->ttc_header.count = 0; 1095 1096 /* freeing table directory */ 1097 FT_FREE( face->dir_tables ); 1098 face->num_tables = 0; 1099 1100 { 1101 FT_Stream stream = FT_FACE_STREAM( face ); 1102 1103 1104 /* simply release the 'cmap' table frame */ 1105 FT_FRAME_RELEASE( face->cmap_table ); 1106 face->cmap_size = 0; 1107 } 1108 1109 /* freeing the horizontal metrics */ 1110 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS 1111 { 1112 FT_Stream stream = FT_FACE_STREAM( face ); 1113 1114 1115 FT_FRAME_RELEASE( face->horz_metrics ); 1116 FT_FRAME_RELEASE( face->vert_metrics ); 1117 face->horz_metrics_size = 0; 1118 face->vert_metrics_size = 0; 1119 } 1120 #else 1121 FT_FREE( face->horizontal.long_metrics ); 1122 FT_FREE( face->horizontal.short_metrics ); 1123 #endif 1124 1125 /* freeing the vertical ones, if any */ 1126 if ( face->vertical_info ) 1127 { 1128 FT_FREE( face->vertical.long_metrics ); 1129 FT_FREE( face->vertical.short_metrics ); 1130 face->vertical_info = 0; 1131 } 1132 1133 /* freeing the gasp table */ 1134 FT_FREE( face->gasp.gaspRanges ); 1135 face->gasp.numRanges = 0; 1136 1137 /* freeing the name table */ 1138 if ( sfnt ) 1139 sfnt->free_name( face ); 1140 1141 /* freeing family and style name */ 1142 FT_FREE( face->root.family_name ); 1143 FT_FREE( face->root.style_name ); 1144 1145 /* freeing sbit size table */ 1146 FT_FREE( face->root.available_sizes ); 1147 face->root.num_fixed_sizes = 0; 1148 1149 FT_FREE( face->postscript_name ); 1150 1151 face->sfnt = 0; 1152 } 1153 1154 1155 /* END */ 1156