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naive implementation

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This commit is contained in:
Alexander 2017-08-12 19:17:21 +03:00
parent 91b08b7daa
commit a2681a0690
1 changed files with 46 additions and 2 deletions
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48
libImaging/Bands.c
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@ -131,14 +131,14 @@ ImagingFillBand(Imaging imOut, int band, int color)
Imaging Imaging
ImagingMerge(const char* mode, Imaging bands[4]) ImagingMerge(const char* mode, Imaging bands[4])
{ {
int i; int i, x, y;
int bandsCount = 0; int bandsCount = 0;
Imaging imOut; Imaging imOut;
Imaging firstBand; Imaging firstBand;
firstBand = bands[0]; firstBand = bands[0];
if ( ! firstBand) { if ( ! firstBand) {
return (Imaging) ImagingError_ValueError("At least one band required"); return (Imaging) ImagingError_ValueError("wrong number of bands");
} }
for (i = 0; i < 4; ++i) { for (i = 0; i < 4; ++i) {
@ -164,5 +164,49 @@ ImagingMerge(const char* mode, Imaging bands[4])
return (Imaging) ImagingError_ValueError("wrong number of bands"); return (Imaging) ImagingError_ValueError("wrong number of bands");
} }
if (imOut->bands == 1)
return ImagingCopy2(imOut, firstBand);
if (imOut->bands == 2) {
for (y = 0; y < imOut->ysize; y++) {
UINT8* in0 = bands[0]->image8[y];
UINT8* in1 = bands[1]->image8[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < imOut->xsize; x++) {
out[0] = *in0;
out[3] = *in1;
out += 4;
}
}
} else if (imOut->bands == 3) {
for (y = 0; y < imOut->ysize; y++) {
UINT8* in0 = bands[0]->image8[y];
UINT8* in1 = bands[1]->image8[y];
UINT8* in2 = bands[2]->image8[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < imOut->xsize; x++) {
out[0] = *in0;
out[1] = *in1;
out[2] = *in2;
out += 4;
}
}
} else if (imOut->bands == 4) {
for (y = 0; y < imOut->ysize; y++) {
UINT8* in0 = bands[0]->image8[y];
UINT8* in1 = bands[1]->image8[y];
UINT8* in2 = bands[2]->image8[y];
UINT8* in3 = bands[3]->image8[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < imOut->xsize; x++) {
out[0] = *in0;
out[1] = *in1;
out[2] = *in2;
out[3] = *in3;
out += 4;
}
}
}
return imOut; return imOut;
} }