<?php
/* (C) 2008 by Julian von Mendel (prog@derjulian.net)
 * License: LGPL3
 * $LastChangedBy: jvm $
 * $LastChangedDate: 2008-03-31 17:46:20 +0000 (Mon, 31 Mar 2008) $
 * $Revision: 1 $
 */

require_once("image.php");

class image_invert extends imagealgorithmmask {
	public function algorithm($x, $y) {
		$color = $this->image->getpixel($x, $y, false);
        foreach ($color as $key => $val) {
            $color[$key] ^= 255;
        }

        return $color;
	}
}