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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _getfillmask function returns the current fill mask. The mask
     is an 8-by-8 bit array, 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, or if <mask> is NULL, a solid (unpatterned) fill is performed
     using the current color.
 
     Return Value
 
     If no mask is set, the function returns NULL. Otherwise, it
     returns the current fill mask.
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