PHPOffice/PHPPresentation

<?php
/**
 * This file is part of PHPPresentation - A pure PHP library for reading and writing
 * presentations documents.
 *
 * PHPPresentation is free software distributed under the terms of the GNU Lesser
 * General Public License version 3 as published by the Free Software Foundation.
 *
 * For the full copyright and license information, please read the LICENSE
 * file that was distributed with this source code. For the full list of
 * contributors, visit https://github.com/PHPOffice/PHPPresentation/contributors.
 *
 * @see        https://github.com/PHPOffice/PHPPresentation
 *
 * @license     http://www.gnu.org/licenses/lgpl.txt LGPL version 3
 */

declare(strict_types=1);

namespace PhpOffice\PhpPresentation\Writer\PowerPoint2007;

use PhpOffice\Common\Adapter\Zip\ZipInterface;

class DocPropsThumbnail extends AbstractDecoratorWriter
{
    public function render(): ZipInterface
    {
        $thumnbail = $this->getPresentation()->getPresentationProperties()->getThumbnail();
        if ($thumnbail) {
            $gdImage = imagecreatefromstring($thumnbail);
            if ($gdImage) {
                ob_start();
                imagejpeg($gdImage);
                $imageContents = ob_get_contents();
                ob_end_clean();
                imagedestroy($gdImage);
                $this->getZip()->addFromString('docProps/thumbnail.jpeg', $imageContents);
            }
        }

        // Return
        return $this->getZip();
    }
}