even-odd fill rule

To determine if a pixel should be filled using this rule, draw a line from the pixel to infinity (in any direction) then count the number of times contours cross this line. If that number is odd then fill the point, if it is even then do not fill the point. This method is used for fonts by postscript rasterizers after level 2.0 of PostScript. See Also Non-Zero Winding Number Fill.