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     The floodfill functions fill an area of the display, using the
     current color and fill mask.
 
     The floodfill function begins filling at the view-coordinate point
     (<x>,<y>).
 
     The floodfill_w function begins filling at the window-coordinate
     point (<wx>, <wy>).
 
     If this point lies inside the figure, the interior is filled; if it
     lies outside the figure, the background is filled. The point must
     be inside or outside the figure to be filled, not on the figure
     boundary itself. Filling occurs in all directions, stopping at the
     <boundary> color.
 
     Return Value
 
     The floodfill functions return a nonzero value if the fill is
     successful. They return 0 if the fill could not be completed, the
     starting point lies on the <boundary> color, or the starting
     point lies outside the clipping region.
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