ttload.c

qt-embedded-2.3.8.tar.gz源码

  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Free_Names                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Frees the name records.                                            */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A handle to the target face object.                        */
  /*                                                                       */
  FT_LOCAL_DEF
  void  TT_Free_Names( TT_Face  face )
  {
    FT_Memory      memory = face->root.driver->root.memory;
    TT_NameTable*  names  = &face->name_table;


    /* free strings table */
    FREE( names->names );

    /* free strings storage */
    FREE( names->storage );

    names->numNameRecords = 0;
    names->format         = 0;
    names->storageOffset  = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_CMap                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the cmap directory in a face object.  The cmaps itselves are */
  /*    loaded on demand in the `ttcmap.c' module.                         */
  /*                                                                       */
  /* <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_CMap( TT_Face    face,
                          FT_Stream  stream )
  {
    FT_Error    error;
    FT_Memory   memory = stream->memory;
    FT_Long     table_start;
    TT_CMapDir  cmap_dir;

    const FT_Frame_Field  cmap_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_CMapDir

      FT_FRAME_START( 4 ),
        FT_FRAME_USHORT( tableVersionNumber ),
        FT_FRAME_USHORT( numCMaps ),
      FT_FRAME_END
    };

    const FT_Frame_Field  cmap_rec_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_CMapTable

      FT_FRAME_START( 6 ),
        FT_FRAME_USHORT( format ),
        FT_FRAME_USHORT( length ),
        FT_FRAME_USHORT( version ),
      FT_FRAME_END
    };


    FT_TRACE2(( "CMaps " ));

    error = face->goto_table( face, TTAG_cmap, stream, 0 );
    if ( error )
    {
      error = TT_Err_CMap_Table_Missing;
      goto Exit;
    }

    table_start = FILE_Pos();

    if ( READ_Fields( cmap_fields, &cmap_dir ) )
      goto Exit;

    /* reserve space in face table for cmap tables */
    if ( ALLOC_ARRAY( face->charmaps,
                      cmap_dir.numCMaps,
                      TT_CharMapRec ) )
      goto Exit;

    face->num_charmaps = cmap_dir.numCMaps;
    {
      TT_CharMap  charmap = face->charmaps;
      TT_CharMap  limit   = charmap + face->num_charmaps;


      /* read the header of each charmap first */
      if ( ACCESS_Frame( face->num_charmaps * 8L ) )
        goto Exit;

      for ( ; charmap < limit; charmap++ )
      {
        TT_CMapTable*  cmap;


        charmap->root.face = (FT_Face)face;
        cmap               = &charmap->cmap;

        cmap->loaded             = FALSE;
        cmap->platformID         = GET_UShort();
        cmap->platformEncodingID = GET_UShort();
        cmap->offset             = (FT_ULong)GET_Long();
      }

      FORGET_Frame();

      /* now read the rest of each table */
      for ( charmap = face->charmaps; charmap < limit; charmap++ )
      {
        TT_CMapTable* cmap = &charmap->cmap;


        if ( FILE_Seek( table_start + (FT_Long)cmap->offset ) ||
             READ_Fields( cmap_rec_fields, cmap )             )
          goto Exit;

        cmap->offset = FILE_Pos();
      }
    }

    FT_TRACE2(( "loaded\n" ));

  Exit:
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_OS2                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the OS2 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_OS2( TT_Face    face,
                         FT_Stream  stream )
  {
    FT_Error  error;
    TT_OS2*   os2;

#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_OS2

    const FT_Frame_Field  os2_fields[] =
    {
      FT_FRAME_START( 78 ),
        FT_FRAME_USHORT( version ),
        FT_FRAME_SHORT ( xAvgCharWidth ),
        FT_FRAME_USHORT( usWeightClass ),
        FT_FRAME_USHORT( usWidthClass ),
        FT_FRAME_SHORT ( fsType ),
        FT_FRAME_SHORT ( ySubscriptXSize ),
        FT_FRAME_SHORT ( ySubscriptYSize ),
        FT_FRAME_SHORT ( ySubscriptXOffset ),
        FT_FRAME_SHORT ( ySubscriptYOffset ),
        FT_FRAME_SHORT ( ySuperscriptXSize ),
        FT_FRAME_SHORT ( ySuperscriptYSize ),
        FT_FRAME_SHORT ( ySuperscriptXOffset ),
        FT_FRAME_SHORT ( ySuperscriptYOffset ),
        FT_FRAME_SHORT ( yStrikeoutSize ),
        FT_FRAME_SHORT ( yStrikeoutPosition ),
        FT_FRAME_SHORT ( sFamilyClass ),
        FT_FRAME_BYTE  ( panose[0] ),
        FT_FRAME_BYTE  ( panose[1] ),
        FT_FRAME_BYTE  ( panose[2] ),
        FT_FRAME_BYTE  ( panose[3] ),
        FT_FRAME_BYTE  ( panose[4] ),
        FT_FRAME_BYTE  ( panose[5] ),
        FT_FRAME_BYTE  ( panose[6] ),
        FT_FRAME_BYTE  ( panose[7] ),
        FT_FRAME_BYTE  ( panose[8] ),
        FT_FRAME_BYTE  ( panose[9] ),
        FT_FRAME_ULONG ( ulUnicodeRange1 ),
        FT_FRAME_ULONG ( ulUnicodeRange2 ),
        FT_FRAME_ULONG ( ulUnicodeRange3 ),
        FT_FRAME_ULONG ( ulUnicodeRange4 ),
        FT_FRAME_BYTE  ( achVendID[0] ),
        FT_FRAME_BYTE  ( achVendID[1] ),
        FT_FRAME_BYTE  ( achVendID[2] ),
        FT_FRAME_BYTE  ( achVendID[3] ),

        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 = TT_Err_Ok;
      goto Exit;
    }

    os2 = &face->os2;

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

    os2->ulCodePageRange1 = 0;
    os2->ulCodePageRange2 = 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 TT_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 TT_Err_Ok;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Load_PCLT                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads the PCL 5 Table.                                             */
  /*                                                                       */