LocalPreviewHelper.php

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<?php
namespace TYPO3\CMS\Core\Resource\Processing;

use TYPO3\CMS\Core\Utility\MathUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Resource\File;
use TYPO3\CMS\Core\Utility\CommandUtility;

class LocalPreviewHelper {
    protected $processor;

    public function __construct(LocalImageProcessor $processor) {
        $this->processor = $processor;
    }

    public function process(TaskInterface $task) {
        $sourceFile = $task->getSourceFile();

        // Merge custom configuration with default configuration
        $configuration = array_merge(array('width' => 64, 'height' => 64), $task->getConfiguration());
        $configuration['width'] = MathUtility::forceIntegerInRange($configuration['width'], 1);
        $configuration['height'] = MathUtility::forceIntegerInRange($configuration['height'], 1);

        // Do not scale up if the source file has a size and the target size is larger
        if (
            $sourceFile->getProperty('width') > 0 && $sourceFile->getProperty('height') > 0
            && $configuration['width'] > $sourceFile->getProperty('width')
            && $configuration['height'] > $sourceFile->getProperty('height')
        ) {
            return NULL;
        }

        return $this->generatePreviewFromFile($sourceFile, $configuration, $this->getTemporaryFilePath($task));
    }

    protected function getTemporaryFilePath(TaskInterface $task) {
        return GeneralUtility::tempnam('preview_', '.' . $task->getTargetFileExtension());
    }

    protected function generatePreviewFromFile(File $file, array $configuration, $targetFilePath) {
        $originalFileName = $file->getForLocalProcessing(FALSE);

        // Check file extension
        if ($file->getType() != File::FILETYPE_IMAGE &&
            !GeneralUtility::inList($GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext'], $file->getExtension())) {
            // Create a default image
            $this->processor->getTemporaryImageWithText($targetFilePath, 'Not imagefile!', 'No ext!', $file->getName());
        } else {
                // Create the temporary file
            if ($GLOBALS['TYPO3_CONF_VARS']['GFX']['im']) {
                $parameters = '-sample ' . $configuration['width'] . 'x' . $configuration['height'] . ' '
                    . $this->processor->wrapFileName($originalFileName) . '[0] ' . $this->processor->wrapFileName($targetFilePath);

                $cmd = GeneralUtility::imageMagickCommand('convert', $parameters) . ' 2>&1';
                CommandUtility::exec($cmd);

                if (!file_exists($targetFilePath)) {
                    // Create a error gif
                    $this->processor->getTemporaryImageWithText($targetFilePath, 'No thumb', 'generated!', $file->getName());
                }
            }
        }

        return array(
            'filePath' => $targetFilePath,
        );
    }
}