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ResampleVertical first implementation

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homm 2016-05-27 06:52:19 +03:00
parent 15586c5b59
commit 8180b0f4c3
1 changed files with 69 additions and 0 deletions
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69
libImaging/Resample.c
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@ -255,6 +255,75 @@ ImagingResampleHorizontal_8bpc(Imaging imIn, int xsize, struct filter *filterp)
} }
Imaging
ImagingResampleVertical_8bpc(Imaging imIn, int ysize, struct filter *filterp)
{
ImagingSectionCookie cookie;
Imaging imOut;
int ss0, ss1, ss2, ss3;
int xx, yy, y, kmax, ymin, ymax;
int *xbounds;
int *k, *kk;
double *prekk;
kmax = ImagingPrecompute(imIn->ysize, ysize, filterp, &xbounds, &prekk);
if ( ! kmax) {
return (Imaging) ImagingError_MemoryError();
}
kk = malloc(ysize * kmax * sizeof(int));
if ( ! kk) {
free(xbounds);
free(prekk);
return (Imaging) ImagingError_MemoryError();
}
for (y = 0; y < ysize * kmax; y++) {
kk[y] = (int) (0.5 + prekk[y] * (1 << PRECISION_BITS));
}
free(prekk);
imOut = ImagingNew(imIn->mode, imIn->xsize, ysize);
if ( ! imOut) {
free(kk);
free(xbounds);
return NULL;
}
ImagingSectionEnter(&cookie);
if (imIn->image8) {
} else if (imIn->type == IMAGING_TYPE_UINT8) {
if (imIn->bands == 2) {
} else if (imIn->bands == 3) {
for (yy = 0; yy < ysize; yy++) {
k = &kk[yy * kmax];
ymin = xbounds[yy * 2 + 0];
ymax = xbounds[yy * 2 + 1];
for (xx = 0; xx < imOut->xsize; xx++) {
ss0 = ss1 = ss2 = 1 << (PRECISION_BITS -1);
for (y = 0; y < ymax; y++) {
ss0 += ((UINT8) imIn->image[y + ymin][xx*4 + 0]) * k[y];
ss1 += ((UINT8) imIn->image[y + ymin][xx*4 + 1]) * k[y];
ss2 += ((UINT8) imIn->image[y + ymin][xx*4 + 2]) * k[y];
}
imOut->image[yy][xx*4 + 0] = clip8(ss0);
imOut->image[yy][xx*4 + 1] = clip8(ss1);
imOut->image[yy][xx*4 + 2] = clip8(ss2);
}
}
} else {
}
}
ImagingSectionLeave(&cookie);
free(kk);
free(xbounds);
return imOut;
}
Imaging Imaging
ImagingResampleHorizontal_32bpc(Imaging imIn, int xsize, struct filter *filterp) ImagingResampleHorizontal_32bpc(Imaging imIn, int xsize, struct filter *filterp)
{ {