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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 * cut region from image
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 *
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 * history:
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 * 95-11-27 fl Created
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 * 98-07-10 fl Fixed "null result" error
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 * 99-02-05 fl Rewritten to use Paste primitive
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 *
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 * Copyright (c) Secret Labs AB 1997-99.
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 * Copyright (c) Fredrik Lundh 1995.
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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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ImagingCrop(Imaging imIn, int sx0, int sy0, int sx1, int sy1) {
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    Imaging imOut;
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    int xsize, ysize;
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    int dx0, dy0, dx1, dy1;
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    INT32 zero = 0;
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    if (!imIn) {
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        return (Imaging)ImagingError_ModeError();
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    }
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    xsize = sx1 - sx0;
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    if (xsize < 0) {
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        xsize = 0;
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    }
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    ysize = sy1 - sy0;
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    if (ysize < 0) {
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        ysize = 0;
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    }
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    imOut = ImagingNewDirty(imIn->mode, xsize, ysize);
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    if (!imOut) {
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        return NULL;
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    }
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    ImagingCopyPalette(imOut, imIn);
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    if (sx0 < 0 || sy0 < 0 || sx1 > imIn->xsize || sy1 > imIn->ysize) {
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        (void)ImagingFill(imOut, &zero);
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    }
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    dx0 = -sx0;
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    dy0 = -sy0;
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    dx1 = imIn->xsize - sx0;
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    dy1 = imIn->ysize - sy0;
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    /* paste the source image on top of the output image!!! */
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    if (ImagingPaste(imOut, imIn, NULL, dx0, dy0, dx1, dy1) < 0) {
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        ImagingDelete(imOut);
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        return NULL;
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    }
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    return imOut;
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}
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