rgbimage.py 文件源码

def ensurebuf(self, invalidate=True):
        if self.dbuf is None:
            if self.dpil is not None:
                self.dbuf = self.dpil.tostring("raw", "RGBX", 0, 1)
            elif self.darr is not None:
                data = self.scaledpixelarray(0,255.999)
                self.dbuf = np.dstack(( np.flipud(np.rollaxis(data,1)).astype(np.uint8),
                                        np.zeros(self.shape[::-1],np.uint8) )).tostring()
            else:
                raise ValueError("No source data for conversion to buffer")
        if invalidate:
            self.dpil = None
            self.darr = None
            self.rangearr = None

    ## This private function ensures that there is a valid numpy array representation, converting from
    #  one of the other representations if necessary, and invalidating the other representations if requested.