question: protected void writeGraphicCtrlExt ( ) throws IOException { out . write ( 0x21 ) ; out . write ( 0xf9 ) ; out . write ( 4 ) ; int transp , disp ; if ( transparent == null ) { transp = 0 ; disp = 0 ; } else { transp = 1 ; disp = 2 ; } if ( dispose >= 0 ) { disp = dispose & 7 ; } disp <<= 2 ; out . write ( 0 | disp | 0 | transp ) ; writeShort ( delay ) ; out . write ( transIndex ) ; out . write ( 0 ) ; }
target:  Writes Graphic Control Extension