AbstractGraphicalTask.php

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

use \TYPO3\CMS\Core\Resource, \TYPO3\CMS\Core\Utility;

abstract class AbstractGraphicalTask extends AbstractTask {

    protected $targetFileExtension;

    public function getTargetFilename() {
        return $this->getSourceFile()->getNameWithoutExtension()
            . '_' . $this->getConfigurationChecksum()
            . '.' . $this->getTargetFileExtension();
    }

    public function getTargetFileExtension() {
        if (!isset($this->targetFileExtension)) {
            $this->targetFileExtension = $this->determineTargetFileExtension();
        }

        return $this->targetFileExtension;
    }

    protected function determineTargetFileExtension() {
        if (!empty($this->configuration['fileExtension'])) {
            $targetFileExtension = $this->configuration['fileExtension'];
        } else {
            // explanation for "thumbnails_png"
            // Bit0: If set, thumbnails from non-jpegs will be 'png', otherwise 'gif' (0=gif/1=png).
            // Bit1: Even JPG's will be converted to png or gif (2=gif/3=png)

            $targetFileExtensionConfiguration = $GLOBALS['TYPO3_CONF_VARS']['GFX']['thumbnails_png'];
            if ($this->getSourceFile()->getExtension() === 'jpg' || $this->getSourceFile()->getExtension() === 'jpeg') {
                if ($targetFileExtensionConfiguration == 2) {
                    $targetFileExtension = 'gif';
                } elseif ($targetFileExtensionConfiguration == 3) {
                    $targetFileExtension = 'png';
                } else {
                    $targetFileExtension = 'jpg';
                }
            } else {
                // check if a png or a gif should be created
                if ($targetFileExtensionConfiguration == 1 || $this->getSourceFile()->getExtension() === 'png') {
                    $targetFileExtension = 'png';
                } else {
                    // thumbnails_png is "0"
                    $targetFileExtension = 'gif';
                }
            }
        }

        return $targetFileExtension;
    }

}