Flags for paint operators in a PDE path.

Values:

IG_PDE_INVISIBLE	0x00	Path is neither stroked nor filled, so it is invisible.
IG_PDE_STROKE	0x01	Stroke the path, as with the S (stroke) operator.
IG_PDE_FILL	0x02	Fills the path, using the nonzero winding number rule to determine the region to fill, as with the f (fill) operator.
IG_PDE_EO_FILL	0x04	Fills the path, using the even-odd rule to determine the region to fill, as with the f* (eofill) operator.