--- ray/src/common/tmprivat.h	2005/01/07 20:33:02	3.14
+++ ray/src/common/tmprivat.h	2008/07/03 03:30:21	3.16
@@ -1,4 +1,4 @@
-/* RCSid $Id: tmprivat.h,v 3.14 2005/01/07 20:33:02 greg Exp $ */
+/* RCSid $Id: tmprivat.h,v 3.16 2008/07/03 03:30:21 greg Exp $ */
 /*
  * Private header file for tone mapping routines.
  */
@@ -37,6 +37,8 @@ extern "C" {
 #define MINBRT		(-16*TM_BRTSCALE)	/* minimum usable brightness */
 #define MINLUM		(1.125352e-7)		/* tmLuminance(MINBRT) */
 
+#define HISTI(li)	(((li)-MINBRT)/HISTEP)
+
 #define LMESLOWER	(5.62e-3)		/* lower mesopic limit */
 #define	LMESUPPER	(5.62)			/* upper mesopic limit */
 #if	(TM_BRTSCALE==128)
@@ -59,7 +61,7 @@ extern "C" {
 MEM_PTR		malloc();
 MEM_PTR		calloc();
 #endif
-extern int	tmErrorReturn(char *, TMstruct *, int);
+extern int	tmErrorReturn(const char *, TMstruct *, int);
 
 						/* lookup for mesopic scaling */
 extern BYTE	tmMesofact[BMESUPPER-BMESLOWER];