--- ray/src/px/pic.h	1989/02/02 10:49:00	1.1
+++ ray/src/px/pic.h	2004/03/28 20:33:14	2.4
@@ -1,7 +1,13 @@
+/* RCSid: $Id: pic.h,v 2.4 2004/03/28 20:33:14 schorsch Exp $ */
 /* the following three structures are used by ciq */
 
-/* SCCSid "$SunId$ LBL" */
+#ifndef _RAD_PIC_H_
+#define _RAD_PIC_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef int colormap[3][256];
 
 typedef unsigned char pixel;
@@ -14,3 +20,29 @@ typedef struct {
 
 /* image resolution */
 extern int	xmax,ymax;
+
+	/* defined in closest.c */
+extern void initializeclosest(void);
+extern int closest(int r, int g, int b);
+
+	/* defined in cut.c */
+extern int makecm(int nw, int *na);
+
+	/* defined in ciq.c */
+extern void ciq(int dith, int nw, int synth, colormap cm);
+
+	/* defined in biq.c */
+extern void biq(int dith, int nw, int synth, colormap cm);
+
+	/* defined in in the calling program */
+extern void picreadcm(colormap  map);
+extern void picwritecm(colormap  cm);
+extern void picwriteline(int  y, pixel  *l);
+extern void picreadline3(int  y, rgbpixel  *l3);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_PIC_H_ */
+