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/*
* The Python Imaging Library
* $Id: Bands.c 2134 2004-10-06 08:55:20Z fredrik $
*
* stuff to extract and paste back individual bands
*
* history:
* 1996-03-20 fl Created
* 1997-08-27 fl Fixed putband for single band targets.
* 2003-09-26 fl Fixed getband/putband for 2-band images (LA, PA).
*
* Copyright (c) 1997-2003 by Secret Labs AB.
* Copyright (c) 1996-1997 by Fredrik Lundh.
*
* See the README file for details on usage and redistribution.
*/
#include "Imaging.h"
#define CLIP(x) ((x) <= 0 ? 0 : (x) < 256 ? (x) : 255)
Imaging
ImagingGetBand(Imaging imIn, int band)
{
Imaging imOut;
int x, y;
/* Check arguments */
if (!imIn || imIn->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imIn->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
/* Shortcuts */
if (imIn->bands == 1)
return ImagingCopy(imIn);
/* Special case for LXXA etc */
if (imIn->bands == 2 && band == 1)
band = 3;
imOut = ImagingNew("L", imIn->xsize, imIn->ysize);
if (!imOut)
return NULL;
/* Extract band from image */
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y] + band;
UINT8* out = imOut->image8[y];
for (x = 0; x < imIn->xsize; x++) {
out[x] = *in;
in += 4;
}
}
return imOut;
}
Imaging
ImagingPutBand(Imaging imOut, Imaging imIn, int band)
{
int x, y;
/* Check arguments */
if (!imIn || imIn->bands != 1 || !imOut)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imOut->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
if (imIn->type != imOut->type ||
imIn->xsize != imOut->xsize ||
imIn->ysize != imOut->ysize)
return (Imaging) ImagingError_Mismatch();
/* Shortcuts */
if (imOut->bands == 1)
return ImagingCopy2(imOut, imIn);
/* Special case for LXXA etc */
if (imOut->bands == 2 && band == 1)
band = 3;
/* Insert band into image */
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = imIn->image8[y];
UINT8* out = (UINT8*) imOut->image[y] + band;
for (x = 0; x < imIn->xsize; x++) {
*out = in[x];
out += 4;
}
}
return imOut;
}
Imaging
ImagingFillBand(Imaging imOut, int band, int color)
{
int x, y;
/* Check arguments */
if (!imOut || imOut->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imOut->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
/* Special case for LXXA etc */
if (imOut->bands == 2 && band == 1)
band = 3;
color = CLIP(color);
/* Insert color into image */
for (y = 0; y < imOut->ysize; y++) {
UINT8* out = (UINT8*) imOut->image[y] + band;
for (x = 0; x < imOut->xsize; x++) {
*out = (UINT8) color;
out += 4;
}
}
return imOut;
}
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