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