a

libdraw/rectclip.c

@@ -0,0 +1,25 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+
+int
+rectclip(Rectangle *rp, Rectangle b)		/* first by reference, second by value */
+{
+	Rectangle *bp = &b;
+	/*
+	 * Expand rectXrect() in line for speed
+	 */
+	if((rp->min.x<bp->max.x && bp->min.x<rp->max.x &&
+	    rp->min.y<bp->max.y && bp->min.y<rp->max.y)==0)
+		return 0;
+	/* They must overlap */
+	if(rp->min.x < bp->min.x)
+		rp->min.x = bp->min.x;
+	if(rp->min.y < bp->min.y)
+		rp->min.y = bp->min.y;
+	if(rp->max.x > bp->max.x)
+		rp->max.x = bp->max.x;
+	if(rp->max.y > bp->max.y)
+		rp->max.y = bp->max.y;
+	return 1;
+}