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intermediate not normalized buffer for coefficients

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This commit is contained in:
homm 2016-05-01 17:48:13 +03:00
parent a5b99dd302
commit 0e2a8e4323
1 changed files with 17 additions and 7 deletions
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24
libImaging/Resample.c
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@ -104,7 +104,7 @@ ImagingResampleHorizontal(Imaging imIn, int xsize, int filter)
float center, ww, ss, ss0, ss1, ss2, ss3;
int xx, yy, x, kmax, xmin, xmax;
int *xbounds;
float *k, *kk;
float *k, *kk, *kw;
/* check filter */
switch (filter) {
@ -151,14 +151,21 @@ ImagingResampleHorizontal(Imaging imIn, int xsize, int filter)
if ( ! kk)
return (Imaging) ImagingError_MemoryError();
xbounds = malloc(xsize * 2 * sizeof(int));
if ( ! xbounds) {
/* intermediate not normalized buffer for coefficients */
kw = malloc(kmax * sizeof(float));
if ( ! kw) {
free(kk);
return (Imaging) ImagingError_MemoryError();
}
xbounds = malloc(xsize * 2 * sizeof(int));
if ( ! xbounds) {
free(kk);
free(kw);
return (Imaging) ImagingError_MemoryError();
}
for (xx = 0; xx < xsize; xx++) {
k = &kk[xx * kmax];
center = (xx + 0.5) * scale;
ww = 0.0;
ss = 1.0 / filterscale;
@ -169,18 +176,21 @@ ImagingResampleHorizontal(Imaging imIn, int xsize, int filter)
if (xmax > imIn->xsize)
xmax = imIn->xsize;
for (x = xmin; x < xmax; x++) {
float w = filterp->filter((x - center + 0.5) * ss) * ss;
k[x - xmin] = w;
float w = filterp->filter((x - center + 0.5) * ss);
kw[x - xmin] = w;
ww += w;
}
k = &kk[xx * kmax];
for (x = 0; x < xmax - xmin; x++) {
if (ww != 0.0)
k[x] /= ww;
k[x] = kw[x] / ww;
}
xbounds[xx * 2 + 0] = xmin;
xbounds[xx * 2 + 1] = xmax;
}
free(kw);
imOut = ImagingNew(imIn->mode, xsize, imIn->ysize);
if ( ! imOut) {
free(kk);