HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

            MSC: void far _setfillmask( unsigned char far *mask )

       - prototype in graph.h

       - mask =  8 by 8 bit fill mask array
       - sets the fill mask used to fill screen regions
       - any bit set to 1 will have the default color; any bit cleared
         to zero leaves the pixel unchanged
       - when no fill mask is set (NULL), the default color only is used

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