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     The getimage subroutines store the screen image defined by a
     specified bounding rectangle in the buffer pointed to by <image>.
 
     The getimage subroutine defines the bounding rectangle with the
     view-coordinate points (<x1>, <y1>) and (<x2>, <y2>).
 
     The getimage_w routine defines the bounding rectangle with the
     window-coordinate points (<wx1>, <wy1>) and (<wx2>, <wy2>).
 
     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.
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