function PointInPolygon(const pt: TPointD; const polygon: TPathD; fillRule: TFillRule): Boolean;
Warning: This function is only safe to use when fillRule is either frEvenOdd or frNonZero. (When fillRule is frPositive or frNegative the function is unreliable when a 'pt' happens to be on a path. So for these 2 fill rules, the function will always return false.)
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