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  Argument
 
    mask       Array of type _FillMask for specifying fill patterns
 
  Returns
 
    Boolean    False if no mask is defined
 
  Description
 
    Some graphics routines (_Ellipse, _FloodFill, _Pie, and _Rectangle)
    can fill part or all of the screen with the current color. The
    filling can be controlled with 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.
 
  _GrStatus Returns
 
    _GrError, _GrNotInProperMode