docs: public static BitMatrix encode(String content, BarcodeFormat format, QrConfig config) {
  		final MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
  		if (null == config) {
  			// 默认配置
  			config = new QrConfig();
  		}
  		BitMatrix bitMatrix;
  		try {
  			bitMatrix = multiFormatWriter.encode(content, format, config.width, config.height, config.toHints());
  		} catch (WriterException e) {
  			throw new QrCodeException(e);
  		}
  
  		return bitMatrix;
  	}