docs: def adjust_size(self, dst_x, dst_y, mode=FIT):
          """
          given a x and y of dest, determine the ratio and return
          an (x,y,w,h) for a output image.
          """
          # get image size
          image = Image.open(self.path)
          width, height = image.size
          if mode == FIT:
              return adjust_crop(dst_x, dst_y, width, height)