InvertPoly
InvertPoly Invert pixels enclosed by a polygon
#include <Quickdraw.h> Quickdraw
void InvertPoly(thePoly );
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.
Returns: none

Notes: For "old model" color, the output result of all Invertxxx functions
depends upon the device being used.
InvertPoly doesn't change the pen position.
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.