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These functions are used to transfer screen images.  The  _getimage function
transfers a rectangular image from the screen into memory.  The  _putimage
function transfers an image from memory back onto the screen.  The functions
ending with _w or _wxy use the window coordinate system; the others use the
view coordinate system.

The following functions are defined:

_getimage
    store an image of an area of the screen into memory

_getimage_w
    store an image of an area of the screen in window coordinates into
    memory

_getimage_wxy
    store an image of an area of the screen in window coordinates into
    memory

_imagesize
    get the size of a screen area

_imagesize_w
    get the size of a screen area in window coordinates

_imagesize_wxy
    get the size of a screen area in window coordinates

_putimage
    display an image from memory on the screen

_putimage_w
    display an image from memory on the screen using window coordinates