graphene:rect-intersection (a b result)

a -- a graphene:rect-t instance
b -- a graphene:rect-t instance
result -- a graphene:rect-t instance

The graphene:rect-t instance with the result, or nil if the rectangles do not intersect.

Computes the intersection of the two given rectangles. If the two rectangles do not intersect, result will contain a degenerate rectangle with origin in (0, 0) and a size of 0.