>># 
>># Copyright 1990, 1991 by the Massachusetts Institute of Technology and
>># UniSoft Group Limited.
>># 
>># Permission to use, copy, modify, distribute, and sell this software and
>># its documentation for any purpose is hereby granted without fee,
>># provided that the above copyright notice appear in all copies and that
>># both that copyright notice and this permission notice appear in
>># supporting documentation, and that the names of MIT and UniSoft not be
>># used in advertising or publicity pertaining to distribution of the
>># software without specific, written prior permission.  MIT and UniSoft
>># make no representations about the suitability of this software for any
>># purpose.  It is provided "as is" without express or implied warranty.
>># 
>># $XConsortium: gtpxl.m,v 1.5 92/06/11 17:35:46 rws Exp $
>># 
>>#
>>TITLE XGetPixel CH10
>>ASSERTION A XGetPixel-1
When the image ximage contains coordinates x,y, then a
call to XGetPixel returns the normalised value of the pixel
located at x,y in the image.
>>STRATEGY
For all supported drawables:
   Create a drawable.
   For a range of pixel values over the drawable's depth:
      Set a pixel in the drawable using XDrawPoint.
      For XYPixmap and ZPixmap:
         Obtain an XImage using XGetImage.
         Obtain the pixel value using XGetPixel.
         Verify that the values are the same.
