'Pixel width and height of full rendered image for a metatile.'

def metaSize(self, coord):

    buffer = (float(self.metatile.buffer) / self.dim)
    width = int((self.dim * ((buffer * 2) + self.metatile.columns)))
    height = int((self.dim * ((buffer * 2) + self.metatile.rows)))
    return (width, height)
