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  Argument
 
    mask    Array specifying fill pattern
 
  Description
 
    The _SetFillMask procedure sets the current fill mask. The mask is
    like an 8 x 8 array of bits, where 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, the area is filled using a solid
    pattern.
 
    The _FillMask type is actually an array of 8 bytes, where each byte
    defines one horizontal line eight pixels long. Each byte in the
    array represents one of the eight different lines in the fill mask.
 
  _GrStatus Returns
 
    _GrNotInProperMode