Function IntRect.Exclude

IntRect Exclude (

IntRect	a
IntRect	b

)

Returns a new rect that contains all of a except for the parts covered by b.

┌───────────┐
│ B │
│ ┌─────┐ │
│ │ │ │ ─►
└──┼─────┼──┘ ┌─────┐
│ A │ │ A │
└─────┘ └─────┘