Aegisub/FexTrackerSource/FexGenericFilter_Contributi...

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// This file is part of FexGenericFilter and (C) 2006 by Hajo Krabbenh<6E>ft (tentacle)
// All rights reserved but the aegisub project is allowed to use it.
{
double width = FilterWidth;
#ifdef CONTRIB_XSCALE
width /= XScale;
double fscale = 1.0 / XScale;
#endif
for(int i=0;i<ImageOutSX;++i)
{
double center = (double) i / XScale;
FexFilterContribution* cc = &Contrib[i];
int left = (int) ceil(center - width);
int right = (int) (floor(center + width) + 0.1);
cc->xMin = left;
cc->xMax = right;
if( cc->xMin < 0 ) cc->xMin = 0;
if( cc->xMax > ImageInSX-1 ) cc->xMax = ImageInSX - 1;
int len = cc->xMax-cc->xMin+1;
cc->Weight = new double[ len ];
memset( cc->Weight, 0x00, sizeof(double)*len );
for(int j=left;j<=right;++j) {
double weight = center - (double) j;
#ifdef CONTRIB_XSCALE
weight = FilterWeight(weight / fscale) / fscale;
#else
weight = FilterWeight(weight);
#endif
int n;
if(j < 0) n=0;
else if(j >= ImageInSX) n = ImageInSX - 1;
else n = j;
cc->Weight[n-cc->xMin] += weight;
}
}
}