crop_grey8
Tcl_Obj* imageObj
int ww
int hn
int we
int hs

/*
 * Border cropping.
 */

crimp_image* image;
crimp_image* result;
int          xo, yo, xi, yi;

crimp_input (imageObj, image, grey8);

if ((ww < 0) || (hn < 0) || (we < 0) || (hs < 0)) {
    Tcl_SetResult(interp, "bad image border size, expected non-negative values", TCL_STATIC);
    return TCL_ERROR;
} else if (((ww + we) > image->w) || ((hn + hs) > image->h)) {
    Tcl_SetResult(interp, "bad image border size, larger than image dimensions", TCL_STATIC);
    return TCL_ERROR;
}

result = crimp_new (image->itype, image->w - ww - we, image->h - hn - hs);

/*
 * Copy the un-cropped part of the input image.
 */

for (yo = 0, yi = hn; yo < result->h; yo++, yi++) {
    for (xo = 0, xi = ww; xo < result->w; xo++, xi++) {
	GREY8 (result, xo, yo) = GREY8 (image, xi, yi);
    }
}

Tcl_SetObjResult(interp, crimp_new_image_obj (result));
return TCL_OK;

/* vim: set sts=4 sw=4 tw=80 et ft=c: */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */