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     The _getimage functions store the screen image defined by a
     specified bounding rectangle into the buffer pointed to by
     <image>.
 
     The _getimage function defines the bounding rectangle with the
     view-coordinate points (<x1>, <y1>) and (<x2>, <y2>).
 
     The _getimage_w routine (implemented as a macro) defines the
     bounding rectangle with the window-coordinate points (<wx1>,
     <wy1>) and (<wx2>, <wy2>).
 
     The _getimage_wxy routine (implemented as a macro) defines the
     bounding rectangle with the window-coordinate pairs (<pwxy1>,
     <pwxy2>).
 
     The buffer must be large enough to hold the image. You can
     determine the size by calling the appropriate _imagesize function
     at run time, or by using the formula described for the _imagesize
     function.
 
     Return Value
 
     None. Use _grstatus to check success.
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