forlang.hlp (Table of Contents; Topic list)
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setfillmask
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     The setfillmask subroutine sets the current fill mask, which
     determines the fill pattern. The mask is an 8-by-8 array of bits,
     in which each bit represents a pixel. A 1 bit sets the
     corresponding pixel to the current color, while a 0 bit leaves the
     pixel unchanged. The mask is repeated over the entire fill area.
 
     If no fill mask is set (<mask> is all zeros──the default), only the
     current color is used in fill operations.
 
     Return Value
 
     None.
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