common: add box_init(), box_width() and box_height() helpers

Add a helper to initialise a box from a position + size, and to obtain
the width and height from an existing box.

Signed-off-by: Russell King <rmk@armlinux.org.uk>

1 files changed, 18 insertions, 0 deletions

diff --git a/common/boxutil.h b/common/boxutil.h
index ae8d17b..55f725c 100644
--- a/common/boxutil.h
+++ b/common/boxutil.h
@@ -6,6 +6,24 @@
 #include "miscstruct.h"
 #include "utils.h"
 
+static inline void box_init(BoxPtr out, int x, int y, int w, int h)
+{
+	out->x1 = x;
+	out->x2 = x + w;
+	out->y1 = y;
+	out->y2 = y + h;
+}
+
+static inline int box_width(const BoxRec *b)
+{
+	return b->x2 - b->x1;
+}
+
+static inline int box_height(const BoxRec *b)
+{
+	return b->y2 - b->y1;
+}
+
 static inline Bool __box_intersect(BoxPtr out, const BoxRec *a, const BoxRec *b)
 {
 	out->x1 = maxt(a->x1, b->x1);