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account for pixel size in ImagingScaleAffine()

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This commit is contained in:
Yay295 2022-08-23 14:44:25 -05:00
parent a2c95d9141
commit 5b94bf1ce8
1 changed files with 19 additions and 25 deletions
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44
src/libImaging/Geometry.c
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@ -731,11 +731,12 @@ ImagingScaleAffine(
/* scale, nearest neighbour resampling */
ImagingSectionCookie cookie;
int x, y;
int x, y, b;
int xin;
double xo, yo;
int xmin, xmax;
int *xintab;
int pixelsize;
if (!imOut || !imIn || strcmp(imIn->mode, imOut->mode) != 0) {
return (Imaging)ImagingError_ModeError();
@ -782,35 +783,28 @@ ImagingScaleAffine(
xo += a[0];
}
#define AFFINE_SCALE(pixel, image) \
for (y = y0; y < y1; y++) { \
int yi = COORD(yo); \
pixel *in, *out; \
out = imOut->image[y]; \
if (fill && x1 > x0) { \
memset(out + x0, 0, (x1 - x0) * sizeof(pixel)); \
} \
if (yi >= 0 && yi < imIn->ysize) { \
in = imIn->image[yi]; \
for (x = xmin; x < xmax; x++) { \
out[x] = in[xintab[x]]; \
} \
} \
yo += a[4]; \
}
pixelsize = imOut->pixelsize;
ImagingSectionEnter(&cookie);
if (imIn->image8) {
AFFINE_SCALE(UINT8, image8);
} else {
AFFINE_SCALE(INT32, image32);
for (y = y0; y < y1; y++) {
int yi = COORD(yo);
UINT8 *in, *out;
out = (UINT8 *)imOut->image[y];
if (fill && x1 > x0) {
memset(out + x0 * pixelsize, 0, (x1 - x0) * pixelsize);
}
if (yi >= 0 && yi < imIn->ysize) {
in = (UINT8 *)imIn->image[yi];
for (x = xmin; x < xmax; x++) {
for (b = 0; b < pixelsize; b++) {
out[x * pixelsize + b] = in[xintab[x] * pixelsize + b];
}
}
}
yo += a[4];
}
ImagingSectionLeave(&cookie);
#undef AFFINE_SCALE
free(xintab);
return imOut;