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. |