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4. Paint the closed region. <Main>
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[Name]
_floodfill
[Syntax]
#include <graph.h>
short _floodfill( short sx, short sy, short boundary ) ;
[Description]
Paints the region, where is enclosed by specified border color, by the
current fill mask pattern.
[Compatibility]
<MS-C Non-Compatible Specification>
(1) The error status is not returned in case that the start point is
specified out of clipping region.
(2) The painting may not be execute correctly in case that the same
color region as the current color exists in the enclosed region.