Grafika\Grafika::detectAvailableEditor PHP Method

    public static function detectAvailableEditor($editorList = null)
    {
        if (null === $editorList) {
            $editorList = self::$editorList;
        }
        /* Get first supported editor instance. Order of editorList matter. */
        foreach ($editorList as $editorName) {
            if ('Imagick' === $editorName) {
                $editorInstance = new ImagickEditor();
            } else {
                $editorInstance = new GdEditor();
            }
            /** @var EditorInterface $editorInstance */
            if (true === $editorInstance->isAvailable()) {
                return $editorName;
            }
        }
        throw new \Exception('No supported editor.');
    }