code: def _catchCurrentViewContent(self):
          
          viewContent = None
          if self._buffer_color_mode != self._display_color_mode:
              viewContent = self._buffer.crop( self.View.rectToArray() ) .convert( self._display_color_mode )
          else:
              viewContent = self._buffer.crop( self.View.rectToArray() )
  
          # Rotate for display direction
          if self._display_direction == 0:
              return viewContent
          else:
              return viewContent.rotate( angle = self._display_direction, expand=True )
docs: !
          \~english
          Catch the current view content
          @return: a PIL Image
          @note 
              Automatically converts the cache color mode and at the 
              same time rotates the captured image data according to 
              the screen angle
  
          \~chinese
          从缓存中抓取当前视图大小的数据
          @return: PIL Image 对象
          @note 自动转换缓存色彩模式，同时根据屏幕角度设定旋转所抓取的图像数据