protected function getSelectionParams()
    {
        $result = $this->getSession('media_crop_selection_params');

        if ($result) {
            if (!isset($result['mode'])) {
                $result['mode'] = self::SELECTION_MODE_NORMAL;
            }

            if (!isset($result['width'])) {
                $result['width'] = null;
            }

            if (!isset($result['height'])) {
                $result['height'] = null;
            }

            return $result;
        }

        return [
            'mode'   => self::SELECTION_MODE_NORMAL,
            'width'  => null,
            'height' => null
        ];
    }