camera_1.12_backup.py 文件源码

def _set_annotate_background(self, value):
        self._check_camera_open()
        if value is True:
            warnings.warn(
                PiCameraDeprecated(
                    'Setting PiCamera.annotate_background to True is '
                    'deprecated; use PiCamera.color.Color("black") instead'))
            value = Color('black')
        elif value is False:
            warnings.warn(
                PiCameraDeprecated(
                    'Setting PiCamera.annotate_background to False is '
                    'deprecated; use None instead'))
            value = None
        elif value is None:
            pass
        elif not isinstance(value, Color):
            raise PiCameraValueError(
                'annotate_background must be a Color or None')
        elif self._camera.annotate_rev < 3 and value.rgb_bytes != (0, 0, 0):
            warnings.warn(
                PiCameraFallback(
                    "Firmware does not support setting a custom background "
                    "annotation color; using black instead"))
        mp = self._camera.control.params[mmal.MMAL_PARAMETER_ANNOTATE]
        if self._camera.annotate_rev == 3:
            if value is None:
                mp.enable_text_background = False
            else:
                mp.enable_text_background = True
                mp.custom_background_color = True
                (
                    mp.custom_background_Y,
                    mp.custom_background_U,
                    mp.custom_background_V,
                    ) = value.yuv_bytes
        else:
            if value is None:
                mp.black_text_background = False
            else:
                mp.black_text_background = True
        self._camera.control.params[mmal.MMAL_PARAMETER_ANNOTATE] = mp