+#include "geom.h"
+
+static inline int min(int x, int y)
+{
+ return x < y ? x : y;
+}
+
+static inline int max(int x, int y)
+{
+ return x > y ? x : y;
+}
+
+Rect rect_union(const Rect &a, const Rect &b)
+{
+ Rect uni;
+ uni.x = min(a.x, b.x);
+ uni.y = min(a.y, b.y);
+ uni.width = max(a.x + a.width, b.x + b.width) - uni.x;
+ uni.height = max(a.y + a.height, b.y + b.height) - uni.y;
+
+ return uni;
+}
+
+Rect rect_intersection(const Rect &a, const Rect &b)
+{
+ Rect intersect;
+ intersect.x = max(a.x, b.x);
+ intersect.y = max(a.y, b.y);
+ intersect.width = max(min(a.x + a.width, b.x + b.width) - intersect.x, 0);
+ intersect.height = max(min(a.y + a.height, b.y + b.height) - intersect.y, 0);
+
+ return intersect;
+}