Многократное watermark по картинке

Хак простенький - заменить в файле:
/engine/classes/thumb.class.php

Строку:
imagecopy( $this->img['src'], $watermark, $watermark_x, $watermark_y, 0, 0, $watermark_width, $watermark_height );

На код:
        $num_x = floor($image_width / $watermark_width);
        $num_y = floor($image_height / $watermark_height);
        
        for($i = 0; $i <= $num_x;$i++) {
            $watermark_x = $watermark_width * $i;
            if($i != 0) imagecopy( $this->img['src'], $watermark, $watermark_x, $watermark_y, 0, 0, $watermark_width, $watermark_height );
            
            for($x = 0; $x <= $num_y;$x++) {
            $watermark_y = $watermark_height * $x;
            imagecopy( $this->img['src'], $watermark, $watermark_x, $watermark_y, 0, 0, $watermark_width, $watermark_height );
            }
        }