public function watermark(ImageManipulator $image, $watermarkImage, $isLeft, $isTop, $marginX, $marginY)
{
// Load the stamp and the photo to apply the watermark to
$stamp = $this->getGDImage($watermarkImage);
$im = $this->getGDImage($image->getImagePath());
// Set the margins for the stamp and get the height/width of the stamp image
$sx = imagesx($stamp);
$sy = imagesy($stamp);
// center?
if (is_null($marginX) && is_null($marginY)) {
$left = (imagesx($im) - $sx) / 2;
$top = (imagesy($im) - $sy) / 2;
} else {
$left = $isLeft ? $marginX : imagesx($im) - $sx - $marginX;
$top = $isTop ? $marginY : imagesy($im) - $sy - $marginY;
}
// Copy the stamp image onto our photo using the margin offsets and the photo
// width to calculate positioning of the stamp.
imagecopy($im, $stamp, $left, $top, 0, 0, $sx, $sy);
// Output and free memory
$this->save($image->getType(), $im, $image->getImagePath(), $image->getQuality());
imagedestroy($im);
}