ttload.c

source code: Covert TXT to PDF

        FT_FRAME_USHORT( fsSelection ),
        FT_FRAME_USHORT( usFirstCharIndex ),
        FT_FRAME_USHORT( usLastCharIndex ),
        FT_FRAME_SHORT ( sTypoAscender ),
        FT_FRAME_SHORT ( sTypoDescender ),
        FT_FRAME_SHORT ( sTypoLineGap ),
        FT_FRAME_USHORT( usWinAscent ),
        FT_FRAME_USHORT( usWinDescent ),
      FT_FRAME_END
    };

    const FT_Frame_Field  os2_fields_extra[] =
    {
      FT_FRAME_START( 8 ),
        FT_FRAME_ULONG( ulCodePageRange1 ),
        FT_FRAME_ULONG( ulCodePageRange2 ),
      FT_FRAME_END
    };

    const FT_Frame_Field  os2_fields_extra2[] =
    {
      FT_FRAME_START( 10 ),
        FT_FRAME_SHORT ( sxHeight ),
        FT_FRAME_SHORT ( sCapHeight ),
        FT_FRAME_USHORT( usDefaultChar ),
        FT_FRAME_USHORT( usBreakChar ),
        FT_FRAME_USHORT( usMaxContext ),
      FT_FRAME_END
    };


    FT_TRACE2(( "OS/2 Table " ));

    /* We now support old Mac fonts where the OS/2 table doesn't  */
    /* exist.  Simply put, we set the `version' field to 0xFFFF   */
    /* and test this value each time we need to access the table. */
    error = face->goto_table( face, TTAG_OS2, stream, 0 );
    if ( error )
    {
      FT_TRACE2(( "is missing!\n" ));
      face->os2.version = 0xFFFF;
      error = SFNT_Err_Ok;
      goto Exit;
    }

    os2 = &face->os2;

    if ( READ_Fields( os2_fields, os2 ) )
      goto Exit;

    os2->ulCodePageRange1 = 0;
    os2->ulCodePageRange2 = 0;
    os2->sxHeight         = 0;
    os2->sCapHeight       = 0;
    os2->usDefaultChar    = 0;
    os2->usBreakChar      = 0;
    os2->usMaxContext     = 0;

    if ( os2->version >= 0x0001 )
    {
      /* only version 1 tables */
      if ( READ_Fields( os2_fields_extra, os2 ) )
        goto Exit;

      if ( os2->version >= 0x0002 )
      {
        /* only version 2 tables */
        if ( READ_Fields( os2_fields_extra2, os2 ) )
          goto Exit;
      }
    }

    FT_TRACE2(( "loaded\n" ));

  Exit:
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_Postscript                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the Postscript table.                                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the target face object.                      */
  /*    stream :: A handle to the input stream.                            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF FT_Error
  TT_Load_PostScript( TT_Face    face,
                      FT_Stream  stream )
  {
    FT_Error        error;
    TT_Postscript*  post = &face->postscript;

    static const FT_Frame_Field  post_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_Postscript

      FT_FRAME_START( 32 ),
        FT_FRAME_ULONG( FormatType ),
        FT_FRAME_ULONG( italicAngle ),
        FT_FRAME_SHORT( underlinePosition ),
        FT_FRAME_SHORT( underlineThickness ),
        FT_FRAME_ULONG( isFixedPitch ),
        FT_FRAME_ULONG( minMemType42 ),
        FT_FRAME_ULONG( maxMemType42 ),
        FT_FRAME_ULONG( minMemType1 ),
        FT_FRAME_ULONG( maxMemType1 ),
      FT_FRAME_END
    };


    FT_TRACE2(( "PostScript " ));

    error = face->goto_table( face, TTAG_post, stream, 0 );
    if ( error )
      return SFNT_Err_Post_Table_Missing;

    if ( READ_Fields( post_fields, post ) )
      return error;

    /* we don't load the glyph names, we do that in another */
    /* module (ttpost).                                     */
    FT_TRACE2(( "loaded\n" ));

    return SFNT_Err_Ok;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_PCLT                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the PCL 5 Table.                                             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the target face object.                      */
  /*    stream :: A handle to the input stream.                            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF FT_Error
  TT_Load_PCLT( TT_Face    face,
                FT_Stream  stream )
  {
    static const FT_Frame_Field  pclt_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_PCLT

      FT_FRAME_START( 54 ),
        FT_FRAME_ULONG ( Version ),
        FT_FRAME_ULONG ( FontNumber ),
        FT_FRAME_USHORT( Pitch ),
        FT_FRAME_USHORT( xHeight ),
        FT_FRAME_USHORT( Style ),
        FT_FRAME_USHORT( TypeFamily ),
        FT_FRAME_USHORT( CapHeight ),
        FT_FRAME_BYTES ( TypeFace, 16 ),
        FT_FRAME_BYTES ( CharacterComplement, 8 ),
        FT_FRAME_BYTES ( FileName, 6 ),
        FT_FRAME_CHAR  ( StrokeWeight ),
        FT_FRAME_CHAR  ( WidthType ),
        FT_FRAME_BYTE  ( SerifStyle ),
        FT_FRAME_BYTE  ( Reserved ),
      FT_FRAME_END
    };

    FT_Error  error;
    TT_PCLT*  pclt = &face->pclt;


    FT_TRACE2(( "PCLT " ));

    /* optional table */
    error = face->goto_table( face, TTAG_PCLT, stream, 0 );
    if ( error )
    {
      FT_TRACE2(( "missing (optional)\n" ));
      pclt->Version = 0;
      return SFNT_Err_Ok;
    }

    if ( READ_Fields( pclt_fields, pclt ) )
      goto Exit;

    FT_TRACE2(( "loaded\n" ));

  Exit:
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_Gasp                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the `gasp' table into a face object.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the target face object.                      */
  /*    stream :: The input stream.                                        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF FT_Error
  TT_Load_Gasp( TT_Face    face,
                FT_Stream  stream )
  {
    FT_Error   error;
    FT_Memory  memory = stream->memory;

    FT_UInt        j,num_ranges;
    TT_GaspRange*  gaspranges;


    FT_TRACE2(( "TT_Load_Gasp: %08p\n", face ));

    /* the gasp table is optional */
    error = face->goto_table( face, TTAG_gasp, stream, 0 );
    if ( error )
      return SFNT_Err_Ok;

    if ( ACCESS_Frame( 4L ) )
      goto Exit;

    face->gasp.version   = GET_UShort();
    face->gasp.numRanges = GET_UShort();

    FORGET_Frame();

    num_ranges = face->gasp.numRanges;
    FT_TRACE3(( "number of ranges = %d\n", num_ranges ));

    if ( ALLOC_ARRAY( gaspranges, num_ranges, TT_GaspRange ) ||
         ACCESS_Frame( num_ranges * 4L )                     )
      goto Exit;

    face->gasp.gaspRanges = gaspranges;

    for ( j = 0; j < num_ranges; j++ )
    {
      gaspranges[j].maxPPEM  = GET_UShort();
      gaspranges[j].gaspFlag = GET_UShort();

      FT_TRACE3(( " [max:%d flag:%d]",
                    gaspranges[j].maxPPEM,
                    gaspranges[j].gaspFlag ));
    }
    FT_TRACE3(( "\n" ));

    FORGET_Frame();
    FT_TRACE2(( "GASP loaded\n" ));

  Exit:
    return error;
  }


  FT_CALLBACK_DEF( int )
  tt_kern_pair_compare( const void*  a,
                        const void*  b );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_Kern                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the first kerning table with format 0 in the font.  Only     */
  /*    accepts the first horizontal kerning table.  Developers should use */
  /*    the `ftxkern' extension to access other kerning tables in the font */
  /*    file, if they really want to.                                      */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the target face object.                      */
  /*    stream :: The input stream.                                        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF FT_Error
  TT_Load_Kern( TT_Face    face,
                FT_Stream  stream )
  {
    FT_Error   error;
    FT_Memory  memory = stream->memory;

    FT_UInt    n, num_tables;


    /* the kern table is optional; exit silently if it is missing */
    error = face->goto_table( face, TTAG_kern, stream, 0 );
    if ( error )
      return SFNT_Err_Ok;

    if ( ACCESS_Frame( 4L ) )
      goto Exit;

    (void)GET_UShort();         /* version */
    num_tables = GET_UShort();

    FORGET_Frame();

    for ( n = 0; n < num_tables; n++ )
    {
      FT_UInt  coverage;
      FT_UInt  length;


      if ( ACCESS_Frame( 6L ) )
        goto Exit;

      (void)GET_UShort();           /* version                 */
      length   = GET_UShort() - 6;  /* substract header length */
      coverage = GET_UShort();

      FORGET_Frame();

      if ( coverage == 0x0001 )
      {
        FT_UInt          num_pairs;
        TT_Kern_0_Pair*  pair;
        TT_Kern_0_Pair*  limit;


        /* found a horizontal format 0 kerning table! */
        if ( ACCESS_Frame( 8L ) )
          goto Exit;

        num_pairs = GET_UShort();

        /* skip the rest */

        FORGET_Frame();

        /* allocate array of kerning pairs */
        if ( ALLOC_ARRAY( face->kern_pairs, num_pairs, TT_Kern_0_Pair ) ||