def prepare_schemes(self, req):

        # fix test bug when in python3 scheme, more details in commint msg
        ret = sorted(self.__schemes__ & set(req.schemes), reverse=True)

        if len(ret) == 0:
            raise ValueError('No schemes available: {0}'.format(req.schemes))
        return ret
Render the image represented by (rgbobj) at dst_x, dst_y
dataset/ETHPy150Open mission-liao/pyswagger/pyswagger/core.py/BaseClient.prepare_schemes--crossover with--dataset/ETHPy150Open ejeschke/ginga/ginga/cairow/ImageViewCairo.py/ImageViewCairo.render_image