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 _imagesize_w()          Return an image size (window coords)

 #include   <graph.h>

 long _imagesize_w(wx1, wy1, wx2, wy2);
 double wx1, wy1;          Upper left of image (window coordinates)
 double wx2, wy2;          Lower right of image (window coordinates)

    _imagesize_w() is the window coordinates version of _imagesize();
    it calculates the amount of storage (in bytes) needed to store an
    image bounded by window coordinates (wx1, wy1) and (wx2, wy2). See
    _imagesize() for more information.

    Returns:          The size of the image in bytes.

     Portability:     MS-DOS only, true MDPA, CGA, EGA, MCGA, or VGA video
                      compatibles