GdThumb::getCurrentDimensions PHP Method

    public function getCurrentDimensions()
    {
        return $this->currentDimensions;
    }

 public function createWatermark($watermark, $mask_position, $mask_padding, $that)
 {
     // bring stuff from the parent class into this class...
     $this->parentInstance = $that;
     $this->currentDimensions = $this->parentInstance->getCurrentDimensions();
     $this->mask_position = $mask_position;
     $width = $this->currentDimensions['width'];
     $height = $this->currentDimensions['height'];
     $watermarksize = getimagesize($watermark);
     $dest_x = $width - $watermarksize[0] - 55;
     $dest_y = $height - $watermarksize[1] - 55;
     //$watermark = imagecreatefrompng($watermark);
     $pathinfo = pathinfo($watermark);
     $var1 = $pathinfo['extension'];
     $var2 = "png";
     $var3 = "jpeg";
     $var4 = "jpg";
     $var5 = "gif";
     if (strcasecmp($var1, $var2) == 0) {
         $watermark = @imagecreatefrompng($watermark);
     } elseif (strcasecmp($var1, $var3) == 0 || strcasecmp($var1, $var4) == 0) {
         $watermark = @imagecreatefromjpeg($watermark);
     } elseif (strcasecmp($var1, $var5) == 0) {
         $watermark = @imagecreatefromgif($watermark);
     }
     switch ($mask_position) {
         case 'cc':
             // Center
             $dest_x = round(($width - $watermarksize[0]) / 2);
             $dest_y = round(($height - $watermarksize[1]) / 2);
             break;
         case 'lt':
             // Left Top
             $dest_x = $mask_padding;
             $dest_y = $mask_padding;
             break;
         case 'rt':
             // Right Top
             $dest_x = $width - $mask_padding - $watermarksize[0];
             $dest_y = $mask_padding;
             break;
         case 'lb':
             // Left Bottom
             $dest_x = $mask_padding;
             $dest_y = $height - $mask_padding - $watermarksize[1];
             break;
         case 'rb':
             // Right Bottom
             $dest_x = $width - $mask_padding - $watermarksize[0];
             $dest_y = $height - $mask_padding - $watermarksize[1];
             break;
         case 'cb':
             // Center Bottom
             $dest_x = round(($width - $watermarksize[0]) / 2);
             $dest_y = $height - $mask_padding - $watermarksize[1];
             break;
     }
     imagecopy($this->parentInstance->getOldImage(), $watermark, $dest_x, $dest_y, 0, 0, $watermarksize[0], $watermarksize[1]);
     return $that;
 }