填充用的闭合区域的类型

enum HatchLoopType {
  kDefault = 0,
  kExternal = 1,
  kPolyline = 2,
  kDerived = 4,
  kTextbox = 8,
  kOutermost = 0x10,
  kNotClosed = 0x20,
  kSelfIntersecting = 0x40,
  kTextIsland = 0x80
};