--- /dev/null
+#ifndef GEOM_H_
+#define GEOM_H_
+
+struct Rect {
+ int x, y;
+ int width, height;
+};
+
+// TODO probably need to implement something like this:
+/*
+Rect rect_union(const Rect &a, const Rect &b);
+Rect rect_intersection(const Rect &a, const Rect &b);
+*/
+
+#endif // GEOM_H_