From bd8032bb42df52c7c2c33b76bf8904db714cf395 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Wed, 16 Dec 2009 10:38:31 -0800
Subject: Clamp negative values to zero when displaying

---
 src/render.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/render.c b/src/render.c
index bf6c0256..ba76b9e6 100644
--- a/src/render.c
+++ b/src/render.c
@@ -34,6 +34,7 @@
 									       \
 	r = 0;	g = 0;	b = 0;						       \
 									       \
+	if ( p < 0.0 ) p = 0.0;                                                \
 	switch ( s ) {							       \
 		case 0 : {	/* Black to blue */			       \
 			r = 0;		g = 0;			b = p*255;     \
@@ -72,6 +73,7 @@
 #define RENDER_MONO							       \
 	float p;							       \
 	p = (float)val / (float)max;					       \
+	if ( p < 0.0 ) p = 0.0;                                                \
 	r = 255.0*p;	g = 255.0*p;	b = 255.0*p;
 
 /* NB This function is shared between render_get_image() and
-- 
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