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ImagingSplit implementation

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Alexander 2017-08-12 10:13:23 +03:00
parent 559836d97d
commit ca75d63f3a
1 changed files with 56 additions and 1 deletions
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57
libImaging/Bands.c
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@ -76,11 +76,66 @@ ImagingGetBand(Imaging imIn, int band)
int
ImagingSplit(Imaging imIn, Imaging bands[4])
{
int i;
int i, x, y;
/* Check arguments */
if (!imIn || imIn->type != IMAGING_TYPE_UINT8) {
(Imaging) ImagingError_ModeError();
return 0;
}
/* Shortcuts */
if (imIn->bands == 1) {
bands[0] = ImagingCopy(imIn);
return imIn->bands;
}
for (i = 0; i < imIn->bands; i++) {
bands[i] = ImagingNew("L", imIn->xsize, imIn->ysize);
}
/* Extract bands from image */
if (imIn->bands == 2) {
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y];
UINT8* out0 = bands[0]->image8[y];
UINT8* out1 = bands[1]->image8[y];
for (x = 0; x < imIn->xsize; x++) {
out0[x] = in[0];
out1[x] = in[3];
in += 4;
}
}
} else if (imIn->bands == 3) {
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y];
UINT8* out0 = bands[0]->image8[y];
UINT8* out1 = bands[1]->image8[y];
UINT8* out2 = bands[2]->image8[y];
for (x = 0; x < imIn->xsize; x++) {
out0[x] = in[0];
out1[x] = in[1];
out2[x] = in[2];
in += 4;
}
}
} else {
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y];
UINT8* out0 = bands[0]->image8[y];
UINT8* out1 = bands[1]->image8[y];
UINT8* out2 = bands[2]->image8[y];
UINT8* out3 = bands[3]->image8[y];
for (x = 0; x < imIn->xsize; x++) {
out0[x] = in[0];
out1[x] = in[1];
out2[x] = in[2];
out3[x] = in[3];
in += 4;
}
}
}
return imIn->bands;
}