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/src/freetype/src/sfnt/sfobjs.c

https://bitbucket.org/cabalistic/ogredeps/
C | 1163 lines | 718 code | 228 blank | 217 comment | 179 complexity | d5c958f0d978210a769e9369ad03c97c MD5 | raw file
   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*
  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   ),  /* 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    {
 380      FT_TRACE2(( "  not a font using the SFNT container format\n" ));
 381      return SFNT_Err_Unknown_File_Format;
 382    }
 383
 384    face->ttc_header.tag = TTAG_ttcf;
 385
 386    if ( tag == TTAG_ttcf )
 387    {
 388      FT_Int  n;
 389
 390
 391      FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));
 392
 393      if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
 394        return error;
 395
 396      if ( face->ttc_header.count == 0 )
 397        return SFNT_Err_Invalid_Table;
 398
 399      /* a rough size estimate: let's conservatively assume that there   */
 400      /* is just a single table info in each subfont header (12 + 16*1 = */
 401      /* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */
 402      /* size of the TTC header plus `28*count' bytes for all subfont    */
 403      /* headers                                                         */
 404      if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) )
 405        return SFNT_Err_Array_Too_Large;
 406
 407      /* now read the offsets of each font in the file */
 408      if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
 409        return error;
 410
 411      if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
 412        return error;
 413
 414      for ( n = 0; n < face->ttc_header.count; n++ )
 415        face->ttc_header.offsets[n] = FT_GET_ULONG();
 416
 417      FT_FRAME_EXIT();
 418    }
 419    else
 420    {
 421      FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));
 422
 423      face->ttc_header.version = 1 << 16;
 424      face->ttc_header.count   = 1;
 425
 426      if ( FT_NEW( face->ttc_header.offsets ) )
 427        return error;
 428
 429      face->ttc_header.offsets[0] = offset;
 430    }
 431
 432    return error;
 433  }
 434
 435
 436  FT_LOCAL_DEF( FT_Error )
 437  sfnt_init_face( FT_Stream      stream,
 438                  TT_Face        face,
 439                  FT_Int         face_index,
 440                  FT_Int         num_params,
 441                  FT_Parameter*  params )
 442  {
 443    FT_Error        error;
 444    FT_Library      library = face->root.driver->root.library;
 445    SFNT_Service    sfnt;
 446
 447
 448    /* for now, parameters are unused */
 449    FT_UNUSED( num_params );
 450    FT_UNUSED( params );
 451
 452
 453    sfnt = (SFNT_Service)face->sfnt;
 454    if ( !sfnt )
 455    {
 456      sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
 457      if ( !sfnt )
 458      {
 459        FT_ERROR(( "sfnt_init_face: cannot access `sfnt' module\n" ));
 460        return SFNT_Err_Missing_Module;
 461      }
 462
 463      face->sfnt       = sfnt;
 464      face->goto_table = sfnt->goto_table;
 465    }
 466
 467    FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
 468
 469    FT_TRACE2(( "SFNT driver\n" ));
 470
 471    error = sfnt_open_font( stream, face );
 472    if ( error )
 473      return error;
 474
 475    FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index ));
 476
 477    if ( face_index < 0 )
 478      face_index = 0;
 479
 480    if ( face_index >= face->ttc_header.count )
 481      return SFNT_Err_Invalid_Argument;
 482
 483    if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
 484      return error;
 485
 486    /* check that we have a valid TrueType file */
 487    error = sfnt->load_font_dir( face, stream );
 488    if ( error )
 489      return error;
 490
 491    face->root.num_faces  = face->ttc_header.count;
 492    face->root.face_index = face_index;
 493
 494    return error;
 495  }
 496
 497
 498#define LOAD_( x )                                            \
 499  do {                                                        \
 500    FT_TRACE2(( "`" #x "' " ));                               \
 501    FT_TRACE3(( "-->\n" ));                                   \
 502                                                              \
 503    error = sfnt->load_##x( face, stream );                   \
 504                                                              \
 505    FT_TRACE2(( "%s\n", ( !error )                            \
 506                        ? "loaded"                            \
 507                        : ( error == SFNT_Err_Table_Missing ) \
 508                          ? "missing"                         \
 509                          : "failed to load" ));              \
 510    FT_TRACE3(( "\n" ));                                      \
 511  } while ( 0 )
 512
 513#define LOADM_( x, vertical )                                 \
 514  do {                                                        \
 515    FT_TRACE2(( "`%s" #x "' ",                                \
 516                vertical ? "vertical " : "" ));               \
 517    FT_TRACE3(( "-->\n" ));                                   \
 518                                                              \
 519    error = sfnt->load_##x( face, stream, vertical );         \
 520                                                              \
 521    FT_TRACE2(( "%s\n", ( !error )                            \
 522                        ? "loaded"                            \
 523                        : ( error == SFNT_Err_Table_Missing ) \
 524                          ? "missing"                         \
 525                          : "failed to load" ));              \
 526    FT_TRACE3(( "\n" ));                                      \
 527  } while ( 0 )
 528
 529#define GET_NAME( id, field )                                 \
 530  do {                                                        \
 531    error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \
 532    if ( error )                                              \
 533      goto Exit;                                              \
 534  } while ( 0 )
 535
 536
 537  FT_LOCAL_DEF( FT_Error )
 538  sfnt_load_face( FT_Stream      stream,
 539                  TT_Face        face,
 540                  FT_Int         face_index,
 541                  FT_Int         num_params,
 542                  FT_Parameter*  params )
 543  {
 544    FT_Error      error;
 545#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
 546    FT_Error      psnames_error;
 547#endif
 548    FT_Bool       has_outline;
 549    FT_Bool       is_apple_sbit;
 550    FT_Bool       ignore_preferred_family = FALSE;
 551    FT_Bool       ignore_preferred_subfamily = FALSE;
 552
 553    SFNT_Service  sfnt = (SFNT_Service)face->sfnt;
 554
 555    FT_UNUSED( face_index );
 556
 557    /* Check parameters */
 558
 559    {
 560      FT_Int  i;
 561
 562
 563      for ( i = 0; i < num_params; i++ )
 564      {
 565        if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY )
 566          ignore_preferred_family = TRUE;
 567        else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY )
 568          ignore_preferred_subfamily = TRUE;
 569      }
 570    }
 571
 572    /* Load tables */
 573
 574    /* We now support two SFNT-based bitmapped font formats.  They */
 575    /* are recognized easily as they do not include a `glyf'       */
 576    /* table.                                                      */
 577    /*                                                             */
 578    /* The first format comes from Apple, and uses a table named   */
 579    /* `bhed' instead of `head' to store the font header (using    */
 580    /* the same format).  It also doesn't include horizontal and   */
 581    /* vertical metrics tables (i.e. `hhea' and `vhea' tables are  */
 582    /* missing).                                                   */
 583    /*                                                             */
 584    /* The other format comes from Microsoft, and is used with     */
 585    /* WinCE/PocketPC.  It looks like a standard TTF, except that  */
 586    /* it doesn't contain outlines.                                */
 587    /*                                                             */
 588
 589    FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
 590
 591    /* do we have outlines in there? */
 592#ifdef FT_CONFIG_OPTION_INCREMENTAL
 593    has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 ||
 594                           tt_face_lookup_table( face, TTAG_glyf )    != 0 ||
 595                           tt_face_lookup_table( face, TTAG_CFF )     != 0 );
 596#else
 597    has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
 598                           tt_face_lookup_table( face, TTAG_CFF )  != 0 );
 599#endif
 600
 601    is_apple_sbit = 0;
 602
 603    /* if this font doesn't contain outlines, we try to load */
 604    /* a `bhed' table                                        */
 605    if ( !has_outline && sfnt->load_bhed )
 606    {
 607      LOAD_( bhed );
 608      is_apple_sbit = FT_BOOL( !error );
 609    }
 610
 611    /* load the font header (`head' table) if this isn't an Apple */
 612    /* sbit font file                                             */
 613    if ( !is_apple_sbit )
 614    {
 615      LOAD_( head );
 616      if ( error )
 617        goto Exit;
 618    }
 619
 620    if ( face->header.Units_Per_EM == 0 )
 621    {
 622      error = SFNT_Err_Invalid_Table;
 623
 624      goto Exit;
 625    }
 626
 627    /* the following tables are often not present in embedded TrueType */
 628    /* fonts within PDF documents, so don't check for them.            */
 629    LOAD_( maxp );
 630    LOAD_( cmap );
 631
 632    /* the following tables are optional in PCL fonts -- */
 633    /* don't check for errors                            */
 634    LOAD_( name );
 635    LOAD_( post );
 636
 637#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
 638    psnames_error = error;
 639#endif
 640
 641    /* do not load the metrics headers and tables if this is an Apple */
 642    /* sbit font file                                                 */
 643    if ( !is_apple_sbit )
 644    {
 645      /* load the `hhea' and `hmtx' tables */
 646      LOADM_( hhea, 0 );
 647      if ( !error )
 648      {
 649        LOADM_( hmtx, 0 );
 650        if ( error == SFNT_Err_Table_Missing )
 651        {
 652          error = SFNT_Err_Hmtx_Table_Missing;
 653
 654#ifdef FT_CONFIG_OPTION_INCREMENTAL
 655          /* If this is an incrementally loaded font and there are */
 656          /* overriding metrics, tolerate a missing `hmtx' table.  */
 657          if ( face->root.internal->incremental_interface          &&
 658               face->root.internal->incremental_interface->funcs->
 659                 get_glyph_metrics                                 )
 660          {
 661            face->horizontal.number_Of_HMetrics = 0;
 662            error = SFNT_Err_Ok;
 663          }
 664#endif
 665        }
 666      }
 667      else if ( error == SFNT_Err_Table_Missing )
 668      {
 669        /* No `hhea' table necessary for SFNT Mac fonts. */
 670        if ( face->format_tag == TTAG_true )
 671        {
 672          FT_TRACE2(( "This is an SFNT Mac font.\n" ));
 673
 674          has_outline = 0;
 675          error       = SFNT_Err_Ok;
 676        }
 677        else
 678        {
 679          error = SFNT_Err_Horiz_Header_Missing;
 680
 681#ifdef FT_CONFIG_OPTION_INCREMENTAL
 682          /* If this is an incrementally loaded font and there are */
 683          /* overriding metrics, tolerate a missing `hhea' table.  */
 684          if ( face->root.internal->incremental_interface          &&
 685               face->root.internal->incremental_interface->funcs->
 686                 get_glyph_metrics                                 )
 687          {
 688            face->horizontal.number_Of_HMetrics = 0;
 689            error = SFNT_Err_Ok;
 690          }
 691#endif
 692
 693        }
 694      }
 695
 696      if ( error )
 697        goto Exit;
 698
 699      /* try to load the `vhea' and `vmtx' tables */
 700      LOADM_( hhea, 1 );
 701      if ( !error )
 702      {
 703        LOADM_( hmtx, 1 );
 704        if ( !error )
 705          face->vertical_info = 1;
 706      }
 707
 708      if ( error && error != SFNT_Err_Table_Missing )
 709        goto Exit;
 710
 711      LOAD_( os2 );
 712      if ( error )
 713      {
 714        /* we treat the table as missing if there are any errors */
 715        face->os2.version = 0xFFFFU;
 716      }
 717    }
 718
 719    /* the optional tables */
 720
 721    /* embedded bitmap support */
 722    if ( sfnt->load_eblc )
 723    {
 724      LOAD_( eblc );
 725      if ( error )
 726      {
 727        /* a font which contains neither bitmaps nor outlines is */
 728        /* still valid (although rather useless in most cases);  */
 729        /* however, you can find such stripped fonts in PDFs     */
 730        if ( error == SFNT_Err_Table_Missing )
 731          error = SFNT_Err_Ok;
 732        else
 733          goto Exit;
 734      }
 735    }
 736
 737    LOAD_( pclt );
 738    if ( error )
 739    {
 740      if ( error != SFNT_Err_Table_Missing )
 741        goto Exit;
 742
 743      face->pclt.Version = 0;
 744    }
 745
 746    /* consider the kerning and gasp tables as optional */
 747    LOAD_( gasp );
 748    LOAD_( kern );
 749
 750    face->root.num_glyphs = face->max_profile.numGlyphs;
 751
 752    /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes  */
 753    /* a WWS-only font face.  `WWS' stands for `weight', width', and */
 754    /* `slope', a term used by Microsoft's Windows Presentation      */
 755    /* Foundation (WPF).  This flag has been introduced in version   */
 756    /* 1.5 of the OpenType specification (May 2008).                 */
 757
 758    face->root.family_name = NULL;
 759    face->root.style_name  = NULL;
 760    if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
 761    {
 762      if ( !ignore_preferred_family )
 763        GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
 764      if ( !face->root.family_name )
 765        GET_NAME( FONT_FAMILY, &face->root.family_name );
 766
 767      if ( !ignore_preferred_subfamily )
 768        GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
 769      if ( !face->root.style_name )
 770        GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
 771    }
 772    else
 773    {
 774      GET_NAME( WWS_FAMILY, &face->root.family_name );
 775      if ( !face->root.family_name && !ignore_preferred_family )
 776        GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
 777      if ( !face->root.family_name )
 778        GET_NAME( FONT_FAMILY, &face->root.family_name );
 779
 780      GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
 781      if ( !face->root.style_name && !ignore_preferred_subfamily )
 782        GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
 783      if ( !face->root.style_name )
 784        GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
 785    }
 786
 787    /* now set up root fields */
 788    {
 789      FT_Face  root  = &face->root;
 790      FT_Long  flags = root->face_flags;
 791
 792
 793      /*********************************************************************/
 794      /*                                                                   */
 795      /* Compute face flags.                                               */
 796      /*                                                                   */
 797      if ( has_outline == TRUE )
 798        flags |= FT_FACE_FLAG_SCALABLE;   /* scalable outlines */
 799
 800      /* The sfnt driver only supports bitmap fonts natively, thus we */
 801      /* don't set FT_FACE_FLAG_HINTER.                               */
 802      flags |= FT_FACE_FLAG_SFNT       |  /* SFNT file format  */
 803               FT_FACE_FLAG_HORIZONTAL;   /* horizontal data   */
 804
 805#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
 806      if ( psnames_error == SFNT_Err_Ok               &&
 807           face->postscript.FormatType != 0x00030000L )
 808        flags |= FT_FACE_FLAG_GLYPH_NAMES;
 809#endif
 810
 811      /* fixed width font? */
 812      if ( face->postscript.isFixedPitch )
 813        flags |= FT_FACE_FLAG_FIXED_WIDTH;
 814
 815      /* vertical information? */
 816      if ( face->vertical_info )
 817        flags |= FT_FACE_FLAG_VERTICAL;
 818
 819      /* kerning available ? */
 820      if ( TT_FACE_HAS_KERNING( face ) )
 821        flags |= FT_FACE_FLAG_KERNING;
 822
 823#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
 824      /* Don't bother to load the tables unless somebody asks for them. */
 825      /* No need to do work which will (probably) not be used.          */
 826      if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
 827           tt_face_lookup_table( face, TTAG_fvar ) != 0 &&
 828           tt_face_lookup_table( face, TTAG_gvar ) != 0 )
 829        flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
 830#endif
 831
 832      root->face_flags = flags;
 833
 834      /*********************************************************************/
 835      /*                                                                   */
 836      /* Compute style flags.                                              */
 837      /*                                                                   */
 838
 839      flags = 0;
 840      if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
 841      {
 842        /* We have an OS/2 table; use the `fsSelection' field.  Bit 9 */
 843        /* indicates an oblique font face.  This flag has been        */
 844        /* introduced in version 1.5 of the OpenType specification.   */
 845
 846        if ( face->os2.fsSelection & 512 )       /* bit 9 */
 847          flags |= FT_STYLE_FLAG_ITALIC;
 848        else if ( face->os2.fsSelection & 1 )    /* bit 0 */
 849          flags |= FT_STYLE_FLAG_ITALIC;
 850
 851        if ( face->os2.fsSelection & 32 )        /* bit 5 */
 852          flags |= FT_STYLE_FLAG_BOLD;
 853      }
 854      else
 855      {
 856        /* this is an old Mac font, use the header field */
 857
 858        if ( face->header.Mac_Style & 1 )
 859          flags |= FT_STYLE_FLAG_BOLD;
 860
 861        if ( face->header.Mac_Style & 2 )
 862          flags |= FT_STYLE_FLAG_ITALIC;
 863      }
 864
 865      root->style_flags = flags;
 866
 867      /*********************************************************************/
 868      /*                                                                   */
 869      /* Polish the charmaps.                                              */
 870      /*                                                                   */
 871      /*   Try to set the charmap encoding according to the platform &     */
 872      /*   encoding ID of each charmap.                                    */
 873      /*                                                                   */
 874
 875      tt_face_build_cmaps( face );  /* ignore errors */
 876
 877
 878      /* set the encoding fields */
 879      {
 880        FT_Int  m;
 881
 882
 883        for ( m = 0; m < root->num_charmaps; m++ )
 884        {
 885          FT_CharMap  charmap = root->charmaps[m];
 886
 887
 888          charmap->encoding = sfnt_find_encoding( charmap->platform_id,
 889                                                  charmap->encoding_id );
 890
 891#if 0
 892          if ( root->charmap     == NULL &&
 893               charmap->encoding == FT_ENCODING_UNICODE )
 894          {
 895            /* set 'root->charmap' to the first Unicode encoding we find */
 896            root->charmap = charmap;
 897          }
 898#endif
 899        }
 900      }
 901
 902#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
 903
 904      /*
 905       *  Now allocate the root array of FT_Bitmap_Size records and
 906       *  populate them.  Unfortunately, it isn't possible to indicate bit
 907       *  depths in the FT_Bitmap_Size record.  This is a design error.
 908       */
 909      {
 910        FT_UInt  i, count;
 911
 912
 913#ifndef FT_CONFIG_OPTION_OLD_INTERNALS
 914        count = face->sbit_num_strikes;
 915#else
 916        count = (FT_UInt)face->num_sbit_strikes;
 917#endif
 918
 919        if ( count > 0 )
 920        {
 921          FT_Memory        memory   = face->root.stream->memory;
 922          FT_UShort        em_size  = face->header.Units_Per_EM;
 923          FT_Short         avgwidth = face->os2.xAvgCharWidth;
 924          FT_Size_Metrics  metrics;
 925
 926
 927          if ( em_size == 0 || face->os2.version == 0xFFFFU )
 928          {
 929            avgwidth = 0;
 930            em_size = 1;
 931          }
 932
 933          if ( FT_NEW_ARRAY( root->available_sizes, count ) )
 934            goto Exit;
 935
 936          for ( i = 0; i < count; i++ )
 937          {
 938            FT_Bitmap_Size*  bsize = root->available_sizes + i;
 939
 940
 941            error = sfnt->load_strike_metrics( face, i, &metrics );
 942            if ( error )
 943              goto Exit;
 944
 945            bsize->height = (FT_Short)( metrics.height >> 6 );
 946            bsize->width = (FT_Short)(
 947                ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
 948
 949            bsize->x_ppem = metrics.x_ppem << 6;
 950            bsize->y_ppem = metrics.y_ppem << 6;
 951
 952            /* assume 72dpi */
 953            bsize->size   = metrics.y_ppem << 6;
 954          }
 955
 956          root->face_flags     |= FT_FACE_FLAG_FIXED_SIZES;
 957          root->num_fixed_sizes = (FT_Int)count;
 958        }
 959      }
 960
 961#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
 962
 963      /* a font with no bitmaps and no outlines is scalable; */
 964      /* it has only empty glyphs then                       */
 965      if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
 966        root->face_flags |= FT_FACE_FLAG_SCALABLE;
 967
 968
 969      /*********************************************************************/
 970      /*                                                                   */
 971      /*  Set up metrics.                                                  */
 972      /*                                                                   */
 973      if ( FT_IS_SCALABLE( root ) )
 974      {
 975        /* XXX What about if outline header is missing */
 976        /*     (e.g. sfnt wrapped bitmap)?             */
 977        root->bbox.xMin    = face->header.xMin;
 978        root->bbox.yMin    = face->header.yMin;
 979        root->bbox.xMax    = face->header.xMax;
 980        root->bbox.yMax    = face->header.yMax;
 981        root->units_per_EM = face->header.Units_Per_EM;
 982
 983
 984        /* XXX: Computing the ascender/descender/height is very different */
 985        /*      from what the specification tells you.  Apparently, we    */
 986        /*      must be careful because                                   */
 987        /*                                                                */
 988        /*      - not all fonts have an OS/2 table; in this case, we take */
 989        /*        the values in the horizontal header.  However, these    */
 990        /*        values very often are not reliable.                     */
 991        /*                                                                */
 992        /*      - otherwise, the correct typographic values are in the    */
 993        /*        sTypoAscender, sTypoDescender & sTypoLineGap fields.    */
 994        /*                                                                */
 995        /*        However, certain fonts have these fields set to 0.      */
 996        /*        Rather, they have usWinAscent & usWinDescent correctly  */
 997        /*        set (but with different values).                        */
 998        /*                                                                */
 999        /*      As an example, Arial Narrow is implemented through four   */
1000        /*      files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
1001        /*                                                                */
1002        /*      Strangely, all fonts have the same values in their        */
1003        /*      sTypoXXX fields, except ARIALNB which sets them to 0.     */
1004        /*                                                                */
1005        /*      On the other hand, they all have different                */
1006        /*      usWinAscent/Descent values -- as a conclusion, the OS/2   */
1007        /*      table cannot be used to compute the text height reliably! */
1008        /*                                                                */
1009
1010        /* The ascender and descender are taken from the `hhea' table. */
1011        /* If zero, they are taken from the `OS/2' table.              */
1012
1013        root->ascender  = face->horizontal.Ascender;
1014        root->descender = face->horizontal.Descender;
1015
1016        root->height = (FT_Short)( root->ascender - root->descender +
1017                                   face->horizontal.Line_Gap );
1018
1019        if ( !( root->ascender || root->descender ) )
1020        {
1021          if ( face->os2.version != 0xFFFFU )
1022          {
1023            if ( face->os2.sTypoAscender || face->os2.sTypoDescender )
1024            {
1025              root->ascender  = face->os2.sTypoAscender;
1026              root->descender = face->os2.sTypoDescender;
1027
1028              root->height = (FT_Short)( root->ascender - root->descender +
1029                                         face->os2.sTypoLineGap );
1030            }
1031            else
1032            {
1033              root->ascender  =  (FT_Short)face->os2.usWinAscent;
1034              root->descender = -(FT_Short)face->os2.usWinDescent;
1035
1036              root->height = (FT_UShort)( root->ascender - root->descender );
1037            }
1038          }
1039        }
1040
1041        root->max_advance_width  = face->horizontal.advance_Width_Max;
1042        root->max_advance_height = (FT_Short)( face->vertical_info
1043                                     ? face->vertical.advance_Height_Max
1044                                     : root->height );
1045
1046        /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
1047        /* Adjust underline position from top edge to centre of     */
1048        /* stroke to convert TrueType meaning to FreeType meaning.  */
1049        root->underline_position  = face->postscript.underlinePosition -
1050                                    face->postscript.underlineThickness / 2;
1051        root->underline_thickness = face->postscript.underlineThickness;
1052      }
1053
1054    }
1055
1056  Exit:
1057    FT_TRACE2(( "sfnt_load_face: done\n" ));
1058
1059    return error;
1060  }
1061
1062
1063#undef LOAD_
1064#undef LOADM_
1065#undef GET_NAME
1066
1067
1068  FT_LOCAL_DEF( void )
1069  sfnt_done_face( TT_Face  face )
1070  {
1071    FT_Memory     memory;
1072    SFNT_Service  sfnt;
1073
1074
1075    if ( !face )
1076      return;
1077
1078    memory = face->root.memory;
1079    sfnt   = (SFNT_Service)face->sfnt;
1080
1081    if ( sfnt )
1082    {
1083      /* destroy the postscript names table if it is loaded */
1084      if ( sfnt->free_psnames )
1085        sfnt->free_psnames( face );
1086
1087      /* destroy the embedded bitmaps table if it is loaded */
1088      if ( sfnt->free_eblc )
1089        sfnt->free_eblc( face );
1090    }
1091
1092#ifdef TT_CONFIG_OPTION_BDF
1093    /* freeing the embedded BDF properties */
1094    tt_face_free_bdf_props( face );
1095#endif
1096
1097    /* freeing the kerning table */
1098    tt_face_done_kern( face );
1099
1100    /* freeing the collection table */
1101    FT_FREE( face->ttc_header.offsets );
1102    face->ttc_header.count = 0;
1103
1104    /* freeing table directory */
1105    FT_FREE( face->dir_tables );
1106    face->num_tables = 0;
1107
1108    {
1109      FT_Stream  stream = FT_FACE_STREAM( face );
1110
1111
1112      /* simply release the 'cmap' table frame */
1113      FT_FRAME_RELEASE( face->cmap_table );
1114      face->cmap_size = 0;
1115    }
1116
1117    /* freeing the horizontal metrics */
1118#ifndef FT_CONFIG_OPTION_OLD_INTERNALS
1119    {
1120      FT_Stream  stream = FT_FACE_STREAM( face );
1121
1122
1123      FT_FRAME_RELEASE( face->horz_metrics );
1124      FT_FRAME_RELEASE( face->vert_metrics );
1125      face->horz_metrics_size = 0;
1126      face->vert_metrics_size = 0;
1127    }
1128#else
1129    FT_FREE( face->horizontal.long_metrics );
1130    FT_FREE( face->horizontal.short_metrics );
1131#endif
1132
1133    /* freeing the vertical ones, if any */
1134    if ( face->vertical_info )
1135    {
1136      FT_FREE( face->vertical.long_metrics  );
1137      FT_FREE( face->vertical.short_metrics );
1138      face->vertical_info = 0;
1139    }
1140
1141    /* freeing the gasp table */
1142    FT_FREE( face->gasp.gaspRanges );
1143    face->gasp.numRanges = 0;
1144
1145    /* freeing the name table */
1146    if ( sfnt )
1147      sfnt->free_name( face );
1148
1149    /* freeing family and style name */
1150    FT_FREE( face->root.family_name );
1151    FT_FREE( face->root.style_name );
1152
1153    /* freeing sbit size table */
1154    FT_FREE( face->root.available_sizes );
1155    face->root.num_fixed_sizes = 0;
1156
1157    FT_FREE( face->postscript_name );
1158
1159    face->sfnt = 0;
1160  }
1161
1162
1163/* END */