python-pillow/Pillow
1
1
Fork 0
mirror of https://github.com/python-pillow/Pillow.git synced 2025-01-13 18:56:17 +03:00
Code Issues Packages Projects Releases Wiki Activity

ImagingResampleVertical_32bpc implementation

Browse Source
This commit is contained in:
homm 2016-05-27 07:20:38 +03:00
parent 5cd8c35c82
commit c051f1d79d
1 changed files with 60 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
libImaging/Resample.c
View File

@ -427,6 +427,66 @@ ImagingResampleHorizontal_32bpc(Imaging imIn, int xsize, struct filter *filterp)
}
Imaging
ImagingResampleVertical_32bpc(Imaging imIn, int ysize, struct filter *filterp)
{
ImagingSectionCookie cookie;
Imaging imOut;
double ss;
int xx, yy, y, kmax, ymin, ymax;
int *xbounds;
double *k, *kk;
kmax = ImagingPrecompute(imIn->ysize, ysize, filterp, &xbounds, &kk);
if ( ! kmax) {
return (Imaging) ImagingError_MemoryError();
}
imOut = ImagingNew(imIn->mode, imIn->xsize, ysize);
if ( ! imOut) {
free(kk);
free(xbounds);
return NULL;
}
ImagingSectionEnter(&cookie);
switch(imIn->type) {
case IMAGING_TYPE_INT32:
for (yy = 0; yy < ysize; yy++) {
ymin = xbounds[yy * 2 + 0];
ymax = xbounds[yy * 2 + 1];
k = &kk[yy * kmax];
for (xx = 0; xx < imOut->xsize; xx++) {
ss = 0.0;
for (y = 0; y < ymax; y++)
ss += IMAGING_PIXEL_I(imIn, xx, y + ymin) * k[y];
IMAGING_PIXEL_I(imOut, xx, yy) = ROUND_UP(ss);
}
}
break;
case IMAGING_TYPE_FLOAT32:
for (yy = 0; yy < ysize; yy++) {
ymin = xbounds[yy * 2 + 0];
ymax = xbounds[yy * 2 + 1];
k = &kk[yy * kmax];
for (xx = 0; xx < imOut->xsize; xx++) {
ss = 0.0;
for (y = 0; y < ymax; y++)
ss += IMAGING_PIXEL_F(imIn, xx, y + ymin) * k[y];
IMAGING_PIXEL_F(imOut, xx, yy) = ss;
}
}
break;
}
ImagingSectionLeave(&cookie);
free(kk);
free(xbounds);
return imOut;
}
Imaging
ImagingResample(Imaging imIn, int xsize, int ysize, int filter)
{