--- ray/src/px/ciq.h	1991/11/12 16:05:31	2.1
+++ ray/src/px/ciq.h	2003/07/27 22:12:03	2.4
@@ -1,13 +1,19 @@
-/* Copyright 1988 Regents of the University of California */
+/* RCSid: $Id: ciq.h,v 2.4 2003/07/27 22:12:03 schorsch Exp $ */
 
-/* SCCSid "$SunId$ LBL" */
+#ifndef _RAD_CIQ_H_
+#define _RAD_CIQ_H_
 
 #include <stdio.h>
+
 #include "pic.h"
 
-#define red(i) ((i)>>7&0xf8|4)	/* 5 bits red, 5 bits green, 5 bits blue */
-#define gre(i) ((i)>>2&0xf8|4)
-#define blu(i) ((i)<<3&0xf8|4)
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define red(i) (((i)>>7&0xf8)|4)	/* 5 bits red, 5 bits green, 5 bits blue */
+#define gre(i) (((i)>>2&0xf8)|4)
+#define blu(i) (((i)<<3&0xf8)|4)
 #define len 32768
 
 extern int hist[len];	/* list of frequencies or pixelvalues for coded color */
@@ -19,3 +25,10 @@ extern int n;		/* number of colors in it */
 #define line3alloc(xdim)	(rgbpixel *)emalloc(sizeof(rgbpixel)*xdim)
 
 extern char	*emalloc();
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_CIQ_H_ */
+