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effbot / pil-2009-raclette http://effbot.org/zone/pil-index.htm

Work repository for PIL 1.1.7 and beyond. The "default" branch should be fairly solid, the other branches less so. For production use, see the pil-117 repository.

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pil-117-20090317
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/*
 * The Python Imaging Library
 * $Id: Offset.c 2134 2004-10-06 08:55:20Z fredrik $
 *
 * offset an image in x and y directions
 *
 * history:
 * 96-07-22 fl: Created
 * 98-11-01 cgw@pgt.com: Fixed negative-array index bug
 *
 * Copyright (c) Fredrik Lundh 1996.
 * Copyright (c) Secret Labs AB 1997.
 *
 * See the README file for information on usage and redistribution.
 */


#include "Imaging.h"


Imaging
ImagingOffset(Imaging im, int xoffset, int yoffset)
{
    int x, y;
    Imaging imOut;

    if (!im)
        return (Imaging) ImagingError_ModeError();

    imOut = ImagingNew(im->mode, im->xsize, im->ysize);
    if (!imOut)
        return NULL;

    ImagingCopyInfo(imOut, im);

    /* make offsets positive to avoid negative coordinates */
    xoffset %= im->xsize;
    xoffset = im->xsize - xoffset;
    if (xoffset < 0)
        xoffset += im->xsize;

    yoffset %= im->ysize;
    yoffset = im->ysize - yoffset;
    if (yoffset < 0)
        yoffset += im->ysize;

#define OFFSET(image)\
    for (y = 0; y < im->ysize; y++)\
        for (x = 0; x < im->xsize; x++) {\
            int yi = (y + yoffset) % im->ysize;\
            int xi = (x + xoffset) % im->xsize;\
            imOut->image[y][x] = im->image[yi][xi];\
        }

    if (im->image8)
        OFFSET(image8)
    else
        OFFSET(image32)

    return imOut;
}