Pillow

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/*
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 * The Python Imaging Library
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 * $Id$
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 *
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 * negate image
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 *
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 * to do:
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 *      FIXME: Maybe this should be implemented using ImagingPoint()
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 *
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 * history:
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 * 95-11-27 fl: Created
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 *
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 * Copyright (c) Fredrik Lundh 1995.
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 * Copyright (c) Secret Labs AB 1997.
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 *
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 * See the README file for information on usage and redistribution.
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 */
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#include "Imaging.h"
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Imaging
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ImagingNegative(Imaging im) {
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    Imaging imOut;
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    int x, y;
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    if (!im) {
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        return (Imaging)ImagingError_ModeError();
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    }
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    imOut = ImagingNewDirty(im->mode, im->xsize, im->ysize);
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    if (!imOut) {
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        return NULL;
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    }
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    for (y = 0; y < im->ysize; y++) {
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        for (x = 0; x < im->linesize; x++) {
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            imOut->image[y][x] = ~im->image[y][x];
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        }
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    }
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    return imOut;
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}
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