InvertPoly
PolyHandle thePoly ; handle of polygon to invert
InvertPoly inverts all pixels enclosed by the line segments of the specified region. All black pixels are set to white and vice versa.
thePoly is a handle that leads to a variable-length Polygon structure. It is typically a value obtained via OpenPoly.
Notes: For "old model" color, the output result of all Invertxxx functions
depends upon the device being used.
As with all Quickdraw drawing, the output is clipped to the intersection of
the current GrafPort's bitMap boundary rectangle, the port rectangle, clipping region, and visible region.