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Diffstat (limited to 'Imaging/libImaging/Chops.c')
| -rw-r--r-- | Imaging/libImaging/Chops.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/Imaging/libImaging/Chops.c b/Imaging/libImaging/Chops.c new file mode 100644 index 0000000..fdd13fd --- /dev/null +++ b/Imaging/libImaging/Chops.c @@ -0,0 +1,148 @@ +/* + * 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); +} |