#ifndef __geom_h
#define __geom_h
+#include <glib.h>
+
+typedef struct _GravityCoord {
+ gint pos;
+ gint denom;
+ gboolean center;
+ gboolean opposite;
+} GravityCoord;
+
+typedef struct _GravityPoint {
+ GravityCoord x;
+ GravityCoord y;
+} GravityPoint;
+
+#define GRAVITY_COORD_SET(c, p, cen, opp) \
+ (c).pos = (p), (c).center = (cen), (c).opposite = (opp)
+
+
typedef struct _Point {
int x;
int y;
#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) \
#define RECT_EQUAL(r1, r2) ((r1).x == (r2).x && (r1).y == (r2).y && \
(r1).width == (r2).width && \
(r1).height == (r2).height)
+#define RECT_EQUAL_DIMS(r, x, y, w, h) \
+ ((r).x == (x) && (r).y == (y) && (r).width == (w) && (r).height == (h))
+
+#define RECT_TO_DIMS(r, x, y, w, h) \
+ (x) = (r).x, (y) = (r).y, (w) = (r).width, (h) = (r).height
#define RECT_CONTAINS(r, px, py) \
((px) >= (r).x && (px) < (r).x + (r).width && \
(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;
(s1).bottom_start == (s2).bottom_start && \
(s1).bottom_end == (s2).bottom_end)
+#define RANGES_INTERSECT(r1x, r1w, r2x, r2w) \
+ (r1w && r2w && r1x < r2x + r2w && r1x + r1w > r2x)
+
#endif