Region (region)

Rectangular region for clipping, collision detection, and dirty rectangle tracking.

Struct

struct region_t {
    int x, y;
    int w, h;
};

Function	Description
`region_init(r, x, y, w, h)`	Initialize region
`region_clone(r, o)`	Clone region
`region_isempty(r)`	Check if empty
`region_hit(r, x, y)`	Point containment test
`region_contains(r, o)`	Region containment test
`region_overlap(r, o)`	Overlap test
`region_expand(r, o, n)`	Expand region
`region_intersect(r, a, b)`	Compute intersection, returns whether non-empty
`region_union(r, a, b)`	Compute union