--- ray/src/hd/rhd_qtree2r.c	2003/02/22 02:07:24	3.4
+++ ray/src/hd/rhd_qtree2r.c	2018/10/05 19:19:16	3.8
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rhd_qtree2r.c,v 3.4 2003/02/22 02:07:24 greg Exp $";
+static const char	RCSid[] = "$Id: rhd_qtree2r.c,v 3.8 2018/10/05 19:19:16 greg Exp $";
 #endif
 /*
  * Quadtree display support routines for rectangle output.
@@ -9,15 +9,23 @@ static const char	RCSid[] = "$Id: rhd_qtree2r.c,v 3.4 
 #include "rhd_qtree.h"
 
 
-static
-redraw(tp, x0, y0, x1, y1, l)	/* mark portion of a tree for redraw */
-register RTREE	*tp;
-int	x0, y0, x1, y1;
-int	l[2][2];
+static void redraw(RTREE *tp, int x0, int y0, int x1, int y1, int l[2][2]);
+static void update( uby8 ca[3], RTREE *tp, int x0, int y0, int x1, int y1);
+
+
+static void
+redraw(	/* mark portion of a tree for redraw */
+	RTREE	*tp,
+	int	x0,
+	int	y0,
+	int	x1,
+	int	y1,
+	int	l[2][2]
+)
 {
 	int	quads = CH_ANY;
 	int	mx, my;
-	register int	i;
+	int	i;
 					/* compute midpoint */
 	mx = (x0 + x1) >> 1;
 	my = (y0 + y1) >> 1;
@@ -39,25 +47,29 @@ int	l[2][2];
 }
 
 
-static
-update(ca, tp, x0, y0, x1, y1)	/* update tree display as needed */
-BYTE	ca[3];		/* returned average color */
-register RTREE	*tp;
-int	x0, y0, x1, y1;
+static void
+update(	/* update tree display as needed */
+	uby8	ca[3],		/* returned average color */
+	RTREE	*tp,
+	int	x0,
+	int	y0,
+	int	x1,
+	int	y1
+)
 {
 	int	csm[3], nc;
-	register BYTE	*cp;
-	BYTE	rgb[3];
+	uby8	*cp;
+	uby8	rgb[3];
 	double	dpth2[4], d2;
 	int	gaps = 0;
 	int	mx, my;
-	register int	i;
+	int	i;
 					/* compute leaf depths */
 	d2 = FHUGE*FHUGE;
 	for (i = 0; i < 4; i++)
 		if (tp->flgs & LFF(i)) {
 			FVECT	dv;
-			register float	*wp = qtL.wp[tp->k[i].li];
+			float	*wp = qtL.wp[tp->k[i].li];
 
 			dv[0] = wp[0] - odev.v.vp[0];
 			dv[1] = wp[1] - odev.v.vp[1];
@@ -105,23 +117,29 @@ int	x0, y0, x1, y1;
 }
 
 
-qtRedraw(x0, y0, x1, y1)	/* redraw part or all of our screen */
-int	x0, y0, x1, y1;
+void
+qtRedraw(	/* redraw part or all of our screen */
+	int	x0,
+	int	y0,
+	int	x1,
+	int	y1
+)
 {
 	int	lim[2][2];
 
 	if (is_stump(&qtrunk))
 		return;
-	if (!qtMapLeaves((lim[0][0]=x0) <= 0 & (lim[1][0]=y0) <= 0 &
-		(lim[0][1]=x1) >= odev.hres-1 & (lim[1][1]=y1) >= odev.vres-1))
+	if (!qtMapLeaves(((lim[0][0]=x0) <= 0) & ((lim[1][0]=y0) <= 0) &
+		((lim[0][1]=x1) >= odev.hres-1) & ((lim[1][1]=y1) >= odev.vres-1)))
 		return;
 	redraw(&qtrunk, 0, 0, odev.hres, odev.vres, lim);
 }
 
 
-qtUpdate()			/* update our tree display */
+void
+qtUpdate(void)			/* update our tree display */
 {
-	BYTE	ca[3];
+	uby8	ca[3];
 
 	if (is_stump(&qtrunk))
 		return;