GdImageToStreamTrait.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\ResourceStorage\Flavour\Machine\DefaultMachines;
 
use ILIAS\Filesystem\Stream\FileStream;
use ILIAS\Filesystem\Stream\Streams;
use ILIAS\ResourceStorage\Flavour\Engine\PHPMemoryLimit;
 
trait GdImageToStreamTrait
{
    use PHPMemoryLimit;
    protected function to(\GdImage $image, ?int $quality = null): FileStream
    {
        ob_start();
        imagejpeg($image, null, $quality ?? 75);
        $stringdata = ob_get_contents();
        imagedestroy($image);
        ob_end_clean();
 
        return Streams::ofString($stringdata);
    }
 
    protected function from(FileStream $stream): ?\GdImage
    {
        if ($stream->getSize() > $this->getSizeLimitInBytes()) {
            return null;
        }
 
        try {
            // we try to use the most common formats first
            // this is faster than using imagecreatefromstring
            // and also more memory efficient
            $filename = $stream->getMetadata('uri');
            $mime = mime_content_type($filename);
            return match ($mime) {
                'image/jpeg' => imagecreatefromjpeg($filename),
                'image/png' => imagecreatefrompng($filename),
                'image/gif' => imagecreatefromgif($filename),
                'image/bmp' => imagecreatefrombmp($filename),
                'image/webp' => imagecreatefromwebp($filename),
                default => imagecreatefromstring((string) $stream)
            };
        } catch (\Throwable) {
            return null;
        }
    }
}