tingapp.py 文件源码

def background_color(self):
        try:
            hex_color = self.info['background_color']
        except KeyError:
            return TingApp.default_background_color

        try:
            color = _hex_color_to_tuple(hex_color)
        except:
            logging.exception('Failed to parse hex color, using default')
            return TingApp.default_background_color

        # colorsys works with colors between 0 and 1
        fractional_color = _color_multiply(color, 1/255.0)
        y, i, q = colorsys.rgb_to_yiq(*fractional_color)

        if y > 0.6:
            y = 0.6
            fractional_color = colorsys.yiq_to_rgb(y, i, q)
            color = _color_multiply(fractional_color, 255)
            logging.warning(
                'Background color was too bright (white text must be visible on top of this '
                'color), color "%s" was darkened to "%s"' % (hex_color, _tuple_to_hex_color(color)))

        return color