MEWEL provides several low-level functions which manipulate
 rectangles. Several of these function take entire RECT structures as
 their arguments (an 8-byte data area). Passing entire structure is
 allowed in C, and most modern C compiler should support this.  Several
 of these functions accept pointer to RECTs as their arguments. Please
 note which each function does.

 CopyRect
 EqualRect
 InflateRect
 IntersectRect
 IsRectEmpty
 OffsetRect
 PtInRect
 RectContainsPoint
 RectIntersect
 RectIsEmpty
 RectSize
 RectSort
 RectTile
 RectUnion
 SetRect
 SetRectEmpty
 UnionRect