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dither scaling coefficients so they add up to 1.0

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Originally committed as revision 11124 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc
This commit is contained in:
Michael Niedermayer
2003-10-15 12:08:31 +00:00
parent 379a20360c
commit ff49072013
1 changed files with 6 additions and 1 deletions
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7
postproc/swscale.c
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@@ -1084,8 +1084,10 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
for(i=0; i<dstW; i++) for(i=0; i<dstW; i++)
{ {
int j; int j;
double error=0;
double sum=0; double sum=0;
double scale= one; double scale= one;
for(j=0; j<filterSize; j++) for(j=0; j<filterSize; j++)
{ {
sum+= filter[i*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; scale/= sum;
for(j=0; j<*outFilterSize; j++) 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;
} }
} }