ttload.c

qt-embedded-2.3.8.tar.gz源码

  /* <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 TT_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 TT_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;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <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, version;


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

    if ( ACCESS_Frame( 4L ) )
      goto Exit;

    version    = GET_UShort();
    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;

      version  = 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 ) ||
             ACCESS_Frame( 6L * num_pairs )                             )
          goto Exit;

        pair  = face->kern_pairs;
        limit = pair + num_pairs;
        for ( ; pair < limit; pair++ )
        {
          pair->left  = GET_UShort();
          pair->right = GET_UShort();
          pair->value = GET_UShort();
        }

        FORGET_Frame();

        face->num_kern_pairs   = num_pairs;
        face->kern_table_index = n;
        goto Exit;
      }

      if ( FILE_Skip( length ) )
        goto Exit;
    }

    /* no kern table found -- doesn't matter */
    face->kern_table_index = -1;
    face->num_kern_pairs   = 0;
    face->kern_pairs       = NULL;

  Exit:
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_Hdmx                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the horizontal device metrics 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_Hdmx( TT_Face    face,
                          FT_Stream  stream )
  {
    FT_Error  error;
    FT_Memory memory = stream->memory;

    TT_Hdmx*  hdmx = &face->hdmx;
    FT_Long   num_glyphs;
    FT_Long   record_size;


    hdmx->version     = 0;
    hdmx->num_records = 0;
    hdmx->records     = 0;

    /* this table is optional */
    error = face->goto_table( face, TTAG_hdmx, stream, 0 );
    if ( error )
      return TT_Err_Ok;

    if ( ACCESS_Frame( 8L ) )
      goto Exit;

    hdmx->version     = GET_UShort();
    hdmx->num_records = GET_Short();
    record_size       = GET_Long();

    FORGET_Frame();

    /* Only recognize format 0 */
    if ( hdmx->version != 0 )
      goto Exit;

    if ( ALLOC_ARRAY( hdmx->records, hdmx->num_records, TT_HdmxRec ) )
      goto Exit;

    num_glyphs   = face->root.num_glyphs;
    record_size -= num_glyphs + 2;

    {
      TT_HdmxRec*  cur   = hdmx->records;
      TT_HdmxRec*  limit = cur + hdmx->num_records;


      for ( ; cur < limit; cur++ )
      {
        /* read record */
        if ( READ_Byte( cur->ppem      ) ||
             READ_Byte( cur->max_width ) )
          goto Exit;

        if ( ALLOC( cur->widths, num_glyphs )     ||
             FILE_Read( cur->widths, num_glyphs ) )
          goto Exit;

        /* skip padding bytes */
        if ( record_size > 0 && FILE_Skip( record_size ) )
            goto Exit;
      }
    }

  Exit:
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Free_Hdmx                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Frees the horizontal device metrics table.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A handle to the target face object.                        */
  /*                                                                       */
  FT_LOCAL_DEF
  void  TT_Free_Hdmx( TT_Face  face )
  {
    if ( face )
    {
      FT_Int     n;
      FT_Memory  memory = face->root.driver->root.memory;


      for ( n = 0; n < face->hdmx.num_records; n++ )
        FREE( face->hdmx.records[n].widths );

      FREE( face->hdmx.records );
      face->hdmx.num_records = 0;
    }
  }


/* END */