ImageViewHelper.php

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

/*                                                                        *
 * This script is part of the TYPO3 project - inspiring people to share!  *
 *                                                                        *
 * TYPO3 is free software; you can redistribute it and/or modify it under *
 * the terms of the GNU General Public License version 2 as published by  *
 * the Free Software Foundation.                                          *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General      *
 * Public License for more details.                                       *
 *                                                                        */

use TYPO3\CMS\Core\Resource\Exception\ResourceDoesNotExistException;
use TYPO3\CMS\Core\Resource\FileInterface;
use TYPO3\CMS\Extbase\Domain\Model\AbstractFileFolder;

class ImageViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {
    protected $imageService;

    public function render($src = NULL, $image = NULL, $width = NULL, $height = NULL, $minWidth = NULL, $minHeight = NULL, $maxWidth = NULL, $maxHeight = NULL, $treatIdAsReference = FALSE) {
        if (is_null($src) && is_null($image) || !is_null($src) && !is_null($image)) {
            throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('You must either specify a string src or a File object.', 1382284105);
        }
        try {
            $image = $this->imageService->getImage($src, $image, $treatIdAsReference);
            $processingInstructions = array(
                'width' => $width,
                'height' => $height,
                'minWidth' => $minWidth,
                'minHeight' => $minHeight,
                'maxWidth' => $maxWidth,
                'maxHeight' => $maxHeight,
            );
            $processedImage = $this->imageService->applyProcessingInstructions($image, $processingInstructions);
            return $this->imageService->getImageUri($processedImage);
        } catch (ResourceDoesNotExistException $e) {
            // thrown if file does not exist
        } catch (\UnexpectedValueException $e) {
            // thrown if a file has been replaced with a folder
        } catch (\RuntimeException $e) {
            // RuntimeException thrown if a file is outside of a storage
        } catch (\InvalidArgumentException $e) {
            // thrown if file storage does not exist
        }
        return '';
    }
}