INT 10 - VIDEO - FILL AREA (Hercules GRAFIX)
        AH = 4Eh
        DI = x coordinate of an interior point
        BP = y coordinate of an interior point
Desc:   fill a convex polygonal area bounded by a contiguous line of the
          opposite color with the border color
Note:   the first fill makes the figure solid, the second erases it
SeeAlso: AH=4Ah

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