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/modules/freetype2/src/sfnt/sfobjs.c

http://github.com/zpao/v8monkey
C | 1149 lines | 705 code | 227 blank | 217 comment | 178 complexity | dd212b4a188e5f3e77002516dcd72da2 MD5 | raw file
   1/***************************************************************************/
   2/*                                                                         */
   3/*  sfobjs.c                                                               */
   4/*                                                                         */
   5/*    SFNT object management (base).                                       */
   6/*                                                                         */
   7/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010 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*
  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*
  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
 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
 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
 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 )
 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 )
 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 )
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 */