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/*
* The Python Imaging Library
* $Id: Chops.c 2506 2005-09-10 14:52:13Z Fredrik $
*
* basic channel operations
*
* history:
* 1996-03-28 fl Created
* 1996-08-13 fl Added and/or/xor for "1" images
* 1996-12-14 fl Added add_modulo, sub_modulo
* 2005-09-10 fl Fixed output values from and/or/xor
*
* Copyright (c) 1996 by Fredrik Lundh.
* Copyright (c) 1997 by Secret Labs AB.
*
* See the README file for details on usage and redistribution.
*/
#include "Imaging.h"
#define CHOP(operation, mode)\
int x, y;\
Imaging imOut;\
imOut = create(imIn1, imIn2, mode);\
if (!imOut)\
return NULL;\
for (y = 0; y < imOut->ysize; y++) {\
UINT8* out = (UINT8*) imOut->image[y];\
UINT8* in1 = (UINT8*) imIn1->image[y];\
UINT8* in2 = (UINT8*) imIn2->image[y];\
for (x = 0; x < imOut->linesize; x++) {\
int temp = operation;\
if (temp <= 0)\
out[x] = 0;\
else if (temp >= 255)\
out[x] = 255;\
else\
out[x] = temp;\
}\
}\
return imOut;
#define CHOP2(operation, mode)\
int x, y;\
Imaging imOut;\
imOut = create(imIn1, imIn2, mode);\
if (!imOut)\
return NULL;\
for (y = 0; y < imOut->ysize; y++) {\
UINT8* out = (UINT8*) imOut->image[y];\
UINT8* in1 = (UINT8*) imIn1->image[y];\
UINT8* in2 = (UINT8*) imIn2->image[y];\
for (x = 0; x < imOut->linesize; x++) {\
out[x] = operation;\
}\
}\
return imOut;
static Imaging
create(Imaging im1, Imaging im2, char* mode)
{
int xsize, ysize;
if (!im1 || !im2 || im1->type != IMAGING_TYPE_UINT8 ||
(mode != NULL && (strcmp(im1->mode, "1") || strcmp(im2->mode, "1"))))
return (Imaging) ImagingError_ModeError();
if (im1->type != im2->type ||
im1->bands != im2->bands)
return (Imaging) ImagingError_Mismatch();
xsize = (im1->xsize < im2->xsize) ? im1->xsize : im2->xsize;
ysize = (im1->ysize < im2->ysize) ? im1->ysize : im2->ysize;
return ImagingNew(im1->mode, xsize, ysize);
}
Imaging
ImagingChopLighter(Imaging imIn1, Imaging imIn2)
{
CHOP((in1[x] > in2[x]) ? in1[x] : in2[x], NULL);
}
Imaging
ImagingChopDarker(Imaging imIn1, Imaging imIn2)
{
CHOP((in1[x] < in2[x]) ? in1[x] : in2[x], NULL);
}
Imaging
ImagingChopDifference(Imaging imIn1, Imaging imIn2)
{
CHOP(abs((int) in1[x] - (int) in2[x]), NULL);
}
Imaging
ImagingChopMultiply(Imaging imIn1, Imaging imIn2)
{
CHOP((int) in1[x] * (int) in2[x] / 255, NULL);
}
Imaging
ImagingChopScreen(Imaging imIn1, Imaging imIn2)
{
CHOP(255 - ((int) (255 - in1[x]) * (int) (255 - in2[x])) / 255, NULL);
}
Imaging
ImagingChopAdd(Imaging imIn1, Imaging imIn2, float scale, int offset)
{
CHOP(((int) in1[x] + (int) in2[x]) / scale + offset, NULL);
}
Imaging
ImagingChopSubtract(Imaging imIn1, Imaging imIn2, float scale, int offset)
{
CHOP(((int) in1[x] - (int) in2[x]) / scale + offset, NULL);
}
Imaging
ImagingChopAnd(Imaging imIn1, Imaging imIn2)
{
CHOP2((in1[x] && in2[x]) ? 255 : 0, "1");
}
Imaging
ImagingChopOr(Imaging imIn1, Imaging imIn2)
{
CHOP2((in1[x] || in2[x]) ? 255 : 0, "1");
}
Imaging
ImagingChopXor(Imaging imIn1, Imaging imIn2)
{
CHOP2(((in1[x] != 0) ^ (in2[x] != 0)) ? 255 : 0, "1");
}
Imaging
ImagingChopAddModulo(Imaging imIn1, Imaging imIn2)
{
CHOP2(in1[x] + in2[x], NULL);
}
Imaging
ImagingChopSubtractModulo(Imaging imIn1, Imaging imIn2)
{
CHOP2(in1[x] - in2[x], NULL);
}
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