ImageViewHelper.php

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

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\PathUtility;

class ImageViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\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($src, $width = NULL, $height = NULL, $fallbackImage = '') {
        $content = '';
        $uri = $this->getImageUri($src);

        if (empty($uri) && $fallbackImage !== '') {
            $uri = $this->getImageUri($fallbackImage);
        }

        if (!empty($uri)) {
            if ($width) {
                $this->tag->addAttribute('width', (int)$width);
            }
            if ($height) {
                $this->tag->addAttribute('height', (int)$height);
            }
            $this->tag->addAttribute('src', $uri);
            $content = $this->tag->render();
        }

        return $content;
    }

    protected function getImageUri($src) {
        $uri = GeneralUtility::getFileAbsFileName($src);
        if ($uri !== '' && !file_exists($uri)) {
            $uri = '';
        }
        if ($uri !== '') {
            $uri = '../' . PathUtility::stripPathSitePrefix($uri);
        }
        return $uri;
    }
}