From ff490720135b7b3d2e7e33cce8f6bc843e4333ab Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Wed, 15 Oct 2003 12:08:31 +0000
Subject: [PATCH] dither scaling coefficients so they add up to 1.0
Originally committed as revision 11124 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc
---
postproc/swscale.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/postproc/swscale.c b/postproc/swscale.c
index e911a6467db..d46e6167dcb 100644
--- a/postproc/swscale.c
+++ b/postproc/swscale.c
@@ -1084,8 +1084,10 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
for(i=0; i<dstW; i++)
{
int j;
+ double error=0;
double sum=0;
double scale= one;
+
for(j=0; j<filterSize; j++)
{
sum+= filter[i*filterSize + j];
@@ -1093,7 +1095,10 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
scale/= sum;
for(j=0; j<*outFilterSize; j++)
{
- (*outFilter)[i*(*outFilterSize) + j]= (int)(filter[i*filterSize + j]*scale + 0.5);
+ double v= filter[i*filterSize + j]*scale + error;
+ int intV= floor(v + 0.5);
+ (*outFilter)[i*(*outFilterSize) + j]= intV;
+ error = v - intV;
}
}
--
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