Pimcore\Image\Adapter\GD::addOverlay PHP Method

    public function addOverlay($image, $x = 0, $y = 0, $alpha = 100, $composite = "COMPOSITE_DEFAULT", $origin = 'top-left')
    {
        $this->preModify();
        $image = ltrim($image, "/");
        $image = PIMCORE_DOCUMENT_ROOT . "/" . $image;
        // 100 alpha is default
        if (empty($alpha)) {
            $alpha = 100;
        }
        $alpha = round($alpha / 100, 1);
        if (is_file($image)) {
            list($oWidth, $oHeight) = getimagesize($image);
            if ($origin == 'top-right') {
                $x = $this->getWidth() - $oWidth - $x;
            } elseif ($origin == 'bottom-left') {
                $y = $this->getHeight() - $oHeight - $y;
            } elseif ($origin == 'bottom-right') {
                $x = $this->getWidth() - $oWidth - $x;
                $y = $this->getHeight() - $oHeight - $y;
            } elseif ($origin == 'center') {
                $x = round($this->getWidth() / 2) - round($oWidth / 2) + $x;
                $y = round($this->getHeight() / 2) - round($oHeight / 2) + $y;
            }
            $overlay = imagecreatefromstring(file_get_contents($image));
            imagealphablending($this->resource, true);
            imagecopyresampled($this->resource, $overlay, $x, $y, 0, 0, $oWidth, $oHeight, $oWidth, $oHeight);
        }
        $this->postModify();
        return $this;
    }