Function blit_with 

pub fn blit_with<D, S>(
    dest: impl SurfaceMut<D>,
    src: impl Surface<S>,
    transforms: &[Transform],
    func: impl FnMut(&mut D, &S, Point),
)

Blit part of one surface to another (generalized function).

You can use sub_surface or offset_surface functions to limit the copied area. f is called for each pair of values, the last argument is the value’s source position. The transforms are done in order.