From 4b8daa32342e426270aca945853934e8e25f0af1 Mon Sep 17 00:00:00 2001
From: giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8>
Date: Sun, 20 Jan 2019 19:23:11 +0000
Subject: Fix handling of floating point imprecision in unnormalizing samples

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@3514 9d0c8265-081b-0410-96cb-a4ca84ce46f8
---
 lib/pgm.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/pgm.h')

diff --git a/lib/pgm.h b/lib/pgm.h
index 81e86cfb..d4655239 100644
--- a/lib/pgm.h
+++ b/lib/pgm.h
@@ -42,6 +42,8 @@ typedef unsigned int gray;
 #define PGM_OVERALLMAXVAL 65535
 #define PGM_MAXMAXVAL 255
 
+#define pgm_unnormalize(value, maxval) \
+  ((gray)((value + 1e-6) * (maxval) + 0.5))
 
 /* Magic constants. */
 
-- 
cgit 1.4.1