#define RECT_RIGHT(r) ((r).x + (r).width - 1)
#define RECT_BOTTOM(r) ((r).y + (r).height - 1)
+#define RECT_AREA(r) ((r).width * (r).height)
+
#define RECT_SET_POINT(r, nx, ny) \
(r).x = (nx), (r).y = (ny)
#define RECT_SET_SIZE(r, w, h) \
(r).height = MIN((a).y + (a).height - 1, \
(b).y + (b).height - 1) - (r).y + 1)
+/* Returns the shortest manhatten distance between two rects, or 0 if they
+ intersect. */
+static inline gint rect_manhatten_distance(Rect r, Rect o)
+{
+ if (RECT_INTERSECTS_RECT(r, o))
+ return 0;
+
+ gint min_distance = G_MAXINT;
+ if (RECT_RIGHT(o) < RECT_LEFT(r))
+ min_distance = MIN(min_distance, RECT_LEFT(r) - RECT_RIGHT(o));
+ if (RECT_LEFT(o) > RECT_RIGHT(r))
+ min_distance = MIN(min_distance, RECT_LEFT(o) - RECT_RIGHT(r));
+ if (RECT_BOTTOM(o) < RECT_TOP(r))
+ min_distance = MIN(min_distance, RECT_TOP(r) - RECT_BOTTOM(o));
+ if (RECT_TOP(o) > RECT_BOTTOM(r))
+ min_distance = MIN(min_distance, RECT_TOP(o) - RECT_BOTTOM(r));
+ return min_distance;
+}
+
typedef struct _Strut {
int left;
int top;