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  Arguments
 
    x1, y1        View coordinates of upper-left corner of bounding
                  rectangle
 
    x2, y2        View coordinates of lower-right corner of bounding
                  rectangle
 
    wx1, wy1      Window coordinates of upper-left corner of bounding
                  rectangle
 
    wx2, wy2      Window coordinates of lower-right corner of bounding
                  rectangle
 
    wxy1, wxy2    Window coordinates of bounding rectangle
 
    image         Buffer to hold screen image
 
  Description
 
    The _GetImage procedures store a screen image defined by a
    specified bounding rectangle in the buffer associated with that
    image. The rectangle must be completely within the current clipping
    region.
 
    The buffer must be large enough to hold the image. You must
    determine the size by calling the appropriate _ImageSize
    function at run time, or by using the formula described in the
    _ImageSize help topic.
 
    Warning:  The size of buffer required may exceed 64K. No
    internal error checking is performed, so any attempt to use
    _GetImage without a sufficiently large buffer may alter the
    contents of memory.
 
  _GrStatus Returns
 
    _GrError, _GrNotInProperMode, _GrParameterAltered