MediaViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Resource\FileInterface;
use TYPO3\CMS\Core\Resource\FileReference;
use TYPO3\CMS\Core\Resource\Rendering\RendererRegistry;
use TYPO3\CMS\Extbase\Domain\Model\AbstractFileFolder;
use TYPO3\CMS\Extbase\Service\ImageService;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper;

class MediaViewHelper extends AbstractTagBasedViewHelper
{
    protected $tagName = 'img';

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerUniversalTagAttributes();
        $this->registerTagAttribute('alt', 'string', 'Specifies an alternate text for an image', false);
    }

    public function render($file, $additionalConfig = array(), $width = null, $height = null)
    {

        // get Resource Object (non ExtBase version)
        if (is_callable(array($file, 'getOriginalResource'))) {
            // We have a domain model, so we need to fetch the FAL resource object from there
            $file = $file->getOriginalResource();
        }

        $fileRenderer = RendererRegistry::getInstance()->getRenderer($file);

        // Fallback to image when no renderer is found
        if ($fileRenderer === null) {
            return $this->renderImage($file, $width, $height);
        } else {
            $additionalConfig = array_merge_recursive($this->arguments, $additionalConfig);
            return $fileRenderer->render($file, $width, $height, $additionalConfig);
        }
    }

    protected function renderImage(FileInterface $image, $width, $height)
    {
        $crop = $image instanceof FileReference ? $image->getProperty('crop') : null;
        $processingInstructions = array(
            'width' => $width,
            'height' => $height,
            'crop' => $crop,
        );
        $imageService = $this->getImageService();
        $processedImage = $imageService->applyProcessingInstructions($image, $processingInstructions);
        $imageUri = $imageService->getImageUri($processedImage);

        $this->tag->addAttribute('src', $imageUri);
        $this->tag->addAttribute('width', $processedImage->getProperty('width'));
        $this->tag->addAttribute('height', $processedImage->getProperty('height'));

        $alt = $image->getProperty('alternative');
        $title = $image->getProperty('title');

        // The alt-attribute is mandatory to have valid html-code, therefore add it even if it is empty
        if (empty($this->arguments['alt'])) {
            $this->tag->addAttribute('alt', $alt);
        }
        if (empty($this->arguments['title']) && $title) {
            $this->tag->addAttribute('title', $title);
        }

        return $this->tag->render();
    }

    protected function getImageService()
    {
        return $this->objectManager->get(ImageService::class);
    }
}