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ImagingReduceCorners

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This commit is contained in:
Alexander 2019-11-26 02:45:13 +03:00
parent fba833e1f4
commit 7e978ae542
1 changed files with 52 additions and 4 deletions
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56
src/libImaging/Reduce.c
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@ -715,6 +715,8 @@ ImagingReduce5x5(Imaging imOut, Imaging imIn)
void
ImagingReduceCorners(Imaging imOut, Imaging imIn, int xscale, int yscale)
{
/* Fill the last row and the last column for any xscale and yscale.
*/
int x, y, xx, yy;
if (imIn->image8) {
@ -722,9 +724,10 @@ ImagingReduceCorners(Imaging imOut, Imaging imIn, int xscale, int yscale)
} else {
switch(imIn->type) {
case IMAGING_TYPE_UINT8:
if (imOut->xsize > imIn->xsize / xscale) {
UINT32 multiplier = division_UINT32(xscale * yscale, 8);
UINT32 amend = yscale;
if (imIn->xsize % xscale) {
int scale = (imIn->xsize % xscale) * yscale;
UINT32 multiplier = division_UINT32(scale, 8);
UINT32 amend = scale / 2;
for (y = 0; y < imIn->ysize / yscale; y++) {
UINT32 v;
UINT32 ss0 = amend, ss1 = amend, ss2 = amend, ss3 = amend;
@ -732,7 +735,7 @@ ImagingReduceCorners(Imaging imOut, Imaging imIn, int xscale, int yscale)
for (yy = y*yscale; yy < y*yscale + yscale; yy++) {
UINT8 *line = (UINT8 *)imIn->image[yy];
for (xx = x * xscale; xx < imIn->xsize; xx++) {
for (xx = x*xscale; xx < imIn->xsize; xx++) {
ss0 += line[xx*4 + 0];
ss1 += line[xx*4 + 1];
ss2 += line[xx*4 + 2];
@ -745,6 +748,51 @@ ImagingReduceCorners(Imaging imOut, Imaging imIn, int xscale, int yscale)
memcpy(imOut->image[y] + x * sizeof(v), &v, sizeof(v));
}
}
if (imIn->ysize % yscale) {
int scale = xscale * (imIn->ysize % yscale);
UINT32 multiplier = division_UINT32(scale, 8);
UINT32 amend = scale / 2;
y = imIn->ysize / yscale;
for (x = 0; x < imIn->xsize / xscale; x++) {
UINT32 v;
UINT32 ss0 = amend, ss1 = amend, ss2 = amend, ss3 = amend;
for (yy = y*yscale; yy < imIn->ysize; yy++) {
UINT8 *line = (UINT8 *)imIn->image[yy];
for (xx = x*xscale; xx < x*xscale + xscale; xx++) {
ss0 += line[xx*4 + 0];
ss1 += line[xx*4 + 1];
ss2 += line[xx*4 + 2];
ss3 += line[xx*4 + 3];
}
}
v = MAKE_UINT32(
(ss0 * multiplier) >> 24, (ss1 * multiplier) >> 24,
(ss2 * multiplier) >> 24, (ss3 * multiplier) >> 24);
memcpy(imOut->image[y] + x * sizeof(v), &v, sizeof(v));
}
}
if (imIn->xsize % xscale && imIn->ysize % yscale) {
int scale = (imIn->xsize % xscale) * (imIn->ysize % yscale);
UINT32 multiplier = division_UINT32(scale, 8);
UINT32 amend = scale / 2;
UINT32 v;
UINT32 ss0 = amend, ss1 = amend, ss2 = amend, ss3 = amend;
x = imIn->xsize / xscale;
y = imIn->ysize / yscale;
for (yy = y*yscale; yy < imIn->ysize; yy++) {
UINT8 *line = (UINT8 *)imIn->image[yy];
for (xx = x*xscale; xx < imIn->xsize; xx++) {
ss0 += line[xx*4 + 0];
ss1 += line[xx*4 + 1];
ss2 += line[xx*4 + 2];
ss3 += line[xx*4 + 3];
}
}
v = MAKE_UINT32(
(ss0 * multiplier) >> 24, (ss1 * multiplier) >> 24,
(ss2 * multiplier) >> 24, (ss3 * multiplier) >> 24);
memcpy(imOut->image[y] + x * sizeof(v), &v, sizeof(v));
}
break;
case IMAGING_TYPE_INT32: