src/PhpPresentation/Writer/ODPresentation/ThumbnailsThumbnail.php
<?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\ODPresentation;
use PhpOffice\Common\Adapter\Zip\ZipInterface;
class ThumbnailsThumbnail extends AbstractDecoratorWriter
{
public function render(): ZipInterface
{
$pathThumbnail = $this->getPresentation()->getPresentationProperties()->getThumbnailPath();
if ($pathThumbnail) {
// Size : 128x128 pixel
// PNG : 8bit, non-interlaced with full alpha transparency
$gdImage = imagecreatefromstring(file_get_contents($pathThumbnail));
if ($gdImage) {
[$width, $height] = getimagesize($pathThumbnail);
$gdRender = imagecreatetruecolor(128, 128);
$colorBgAlpha = imagecolorallocatealpha($gdRender, 0, 0, 0, 127);
imagecolortransparent($gdRender, $colorBgAlpha);
imagefill($gdRender, 0, 0, $colorBgAlpha);
imagecopyresampled($gdRender, $gdImage, 0, 0, 0, 0, 128, 128, $width, $height);
imagetruecolortopalette($gdRender, false, 255);
imagesavealpha($gdRender, true);
ob_start();
imagepng($gdRender);
$imageContents = ob_get_contents();
ob_end_clean();
imagedestroy($gdRender);
imagedestroy($gdImage);
$this->getZip()->addFromString('Thumbnails/thumbnail.png', $imageContents);
}
}
return $this->getZip();
}
}