--- ray/src/px/xshowtrace.c	1992/12/11 18:24:29	2.4
+++ ray/src/px/xshowtrace.c	2003/06/27 06:53:22	2.8
@@ -1,9 +1,6 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: xshowtrace.c,v 2.8 2003/06/27 06:53:22 greg Exp $";
 #endif
-
 /*
  *  Display an image and watch the rays get traced.
  *
@@ -12,7 +9,6 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include "standard.h"
 #include "view.h"
-#include "resolu.h"
 #include <X11/Xlib.h>
 
 #define MAXDEPTH	32		/* ridiculous ray tree depth */
@@ -24,7 +20,7 @@ static char SCCSid[] = "$SunId$ LBL";
 #endif
 
 char	rtcom[] = "rtrace -h- -otp -fa -x 1";
-char	xicom[] = "ximage";
+char	xicom[] = "ximage -c 256";
 
 VIEW	ourview = STDVIEW;		/* view for picture */
 RESOLU	ourres;				/* picture resolution */
@@ -140,11 +136,13 @@ mainloop()				/* get and process input */
 freetree(tp)				/* free a trace tree */
 struct node	*tp;
 {
-	register struct node	*kid;
+	register struct node	*kid, *k2;
 
-	for (kid = tp->daughter; kid != NULL; kid = kid->sister)
+	for (kid = tp->daughter; kid != NULL; kid = k2) {
+		k2 = kid->sister;
 		freetree(kid);
-	free((char *)tp);
+	}
+	free((void *)tp);
 }
 
 
@@ -197,10 +195,15 @@ int	ipt[2];
 	Window	rw, cw;
 	unsigned int	pm;
 					/* compute pointer location */
-	if (gwind == 0 &&
-		(gwind = xfindwind(theDisplay, rwind, picture, 4)) == 0) {
-		fprintf(stderr, "%s: cannot find display window!\n", progname);
-		exit(1);
+	if (gwind == 0) {
+		register char	*wn;
+		for (wn = picture; *wn; wn++);
+		while (wn > picture && wn[-1] != '/') wn--;
+		if ((gwind = xfindwind(theDisplay, rwind, wn, 4)) == 0) {
+			fprintf(stderr, "%s: cannot find display window!\n",
+					progname);
+			exit(1);
+		}
 	}
 	XQueryPointer(theDisplay, gwind, &rw, &cw, &rx, &ry, &wx, &wy, &pm);
 	xoff = wx - ipt[0];