--- ray/src/common/tonemap.c	2006/08/09 16:26:54	3.28
+++ ray/src/common/tonemap.c	2009/02/09 20:23:51	3.33
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: tonemap.c,v 3.28 2006/08/09 16:26:54 greg Exp $";
+static const char	RCSid[] = "$Id: tonemap.c,v 3.33 2009/02/09 20:23:51 greg Exp $";
 #endif
 /*
  * Tone mapping functions.
@@ -363,8 +363,8 @@ int	wt
 		tms->hbrmin = tms->hbrmax = ls[i];
 		oldlen = 0;
 	} else {
-		oldorig = (tms->hbrmin-MINBRT)/HISTEP;
-		oldlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - oldorig;
+		oldorig = HISTI(tms->hbrmin);
+		oldlen = HISTI(tms->hbrmax) + 1 - oldorig;
 	}
 	for (i = len; i--; ) {
 		if ((j = ls[i]) < MINBRT)
@@ -374,8 +374,8 @@ int	wt
 		else if (j > tms->hbrmax)
 			tms->hbrmax = j;
 	}
-	horig = (tms->hbrmin-MINBRT)/HISTEP;
-	hlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - horig;
+	horig = HISTI(tms->hbrmin);
+	hlen = HISTI(tms->hbrmax) + 1 - horig;
 	if (hlen > oldlen) {			/* (re)allocate histogram */
 		int	*newhist = (int *)calloc(hlen, sizeof(int));
 		if (newhist == NULL)
@@ -391,7 +391,7 @@ int	wt
 		returnOK;
 	for (i = len; i--; )			/* add in new counts */
 		if (ls[i] >= MINBRT)
-			tms->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt;
+			tms->histo[ HISTI(ls[i]) - horig ] += wt;
 	returnOK;
 }
 
@@ -419,27 +419,6 @@ double	La
 }
 
 
-static int
-tmNewMap(			/* allocate new tone-mapping array */
-TMstruct	*tms
-)
-{
-	if (tms->lumap != NULL && (tms->mbrmax - tms->mbrmin) !=
-					(tms->hbrmax - tms->hbrmin)) {
-		free((MEM_PTR)tms->lumap);
-		tms->lumap = NULL;
-	}
-	tms->mbrmin = tms->hbrmin;
-	tms->mbrmax = tms->hbrmax;
-	if (tms->mbrmin > tms->mbrmax)
-		return 0;
-	if (tms->lumap == NULL)
-		tms->lumap = (unsigned short *)malloc(sizeof(unsigned short)*
-					(tms->mbrmax-tms->mbrmin+1));
-	return(tms->lumap != NULL);
-}
-
-
 int
 tmFixedMapping(			/* compute fixed, linear tone-mapping */
 TMstruct	*tms,
@@ -496,25 +475,23 @@ double	Ldmax
 	Ldmin = Ldmax/Lddyn;
 	logLddyn = log(Lddyn);
 	Ldavg = sqrt(Ldmax*Ldmin);
-	i = (tms->hbrmin-MINBRT)/HISTEP;
-	brt0 = MINBRT + HISTEP/2 + i*HISTEP;
-	histlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - i;
+	i = HISTI(tms->hbrmin);
+	brt0 = HISTV(i);
+	histlen = HISTI(tms->hbrmax) + 1 - i;
 					/* histogram total and mean */
 	histot = 0; sum = 0;
 	j = brt0 + histlen*HISTEP;
 	for (i = histlen; i--; ) {
 		histot += tms->histo[i];
-		sum += (j -= HISTEP) * tms->histo[i];
+		sum += (double)(j -= HISTEP) * tms->histo[i];
 	}
 	threshold = histot*0.005 + .5;
-	if (threshold < 4)
+	if (!histot)
 		returnErr(TM_E_TMFAIL);
 	Lwavg = tmLuminance( (double)sum / histot );
-					/* allocate space for mapping */
-	if (!tmNewMap(tms))
-		returnErr(TM_E_NOMEM);
 					/* use linear tone mapping? */
-	if (tms->flags & TM_F_LINEAR)
+	if (tms->flags & TM_F_LINEAR || threshold < 4 ||
+			tms->hbrmax - tms->hbrmin < TM_BRTSCALE*logLddyn)
 		goto linearmap;
 					/* clamp histogram */
 	histo = (int *)malloc(histlen*sizeof(int));
@@ -555,6 +532,9 @@ double	Ldmax
 			goto linearmap;
 		}
 	} while (trimmings > threshold);
+					/* allocate space for mapping */
+	if (!tmNewMap(tms))
+		returnErr(TM_E_NOMEM);
 					/* assign tone-mapping */
 	for (i = tms->mbrmax-tms->mbrmin+1; i--; ) {
 		j = d = (double)i/(tms->mbrmax-tms->mbrmin)*histlen;
@@ -614,8 +594,6 @@ int	len
 }
 
 
-
-
 TMstruct *
 tmDup(				/* duplicate top tone mapping */
 TMstruct	*tms
@@ -632,8 +610,7 @@ TMstruct	*tms
 		return(NULL);
 	*tmnew = *tms;		/* copy everything */
 	if (tmnew->histo != NULL) {	/* duplicate histogram */
-		len = (tmnew->hbrmax-MINBRT)/HISTEP + 1 -
-				(tmnew->hbrmin-MINBRT)/HISTEP;
+		len = HISTI(tmnew->hbrmax) + 1 - HISTI(tmnew->hbrmin);
 		tmnew->histo = (int *)malloc(len*sizeof(int));
 		if (tmnew->histo != NULL)
 			for (i = len; i--; )
@@ -691,6 +668,27 @@ tmMkMesofact()				/* build mesopic lookup factor table
 		tmMesofact[i-BMESLOWER] = 256. *
 				(tmLuminance(i) - LMESLOWER) /
 				(LMESUPPER - LMESLOWER);
+}
+
+
+int
+tmNewMap(			/* allocate new tone-mapping array */
+TMstruct	*tms
+)
+{
+	if (tms->lumap != NULL && (tms->mbrmax - tms->mbrmin) !=
+					(tms->hbrmax - tms->hbrmin)) {
+		free((MEM_PTR)tms->lumap);
+		tms->lumap = NULL;
+	}
+	tms->mbrmin = tms->hbrmin;
+	tms->mbrmax = tms->hbrmax;
+	if (tms->mbrmin > tms->mbrmax)
+		return 0;
+	if (tms->lumap == NULL)
+		tms->lumap = (unsigned short *)malloc(sizeof(unsigned short)*
+					(tms->mbrmax-tms->mbrmin+1));
+	return(tms->lumap != NULL);
 }