How do I enable compress (I see the code supports it)

[dhcmega]

Hi!
I see that tcpdi.php has this code, that allows for a compress flag. How do I enable compression?
Thanks!

    /**
     * Private Method that writes the form xobjects
     */
    function _putformxobjects() {
        $filter=($this->compress) ? '/Filter /FlateDecode ' : '';
	    reset($this->tpls);
        foreach($this->tpls AS $tplidx => $tpl) {
            $p=($this->compress) ? gzcompress($tpl['buffer']) : $tpl['buffer'];
    		$this->_newobj();
    		$cN = $this->n; // TCPDF/Protection: rem current "n"