void addStartSpan(int endIndex);
int addT(SkOpSegment* other, const SkPoint& pt, double newT);
void addTCancel(const SkPoint& startPt, const SkPoint& endPt, SkOpSegment* other);
void addStartSpan(int endIndex);
int addT(SkOpSegment* other, const SkPoint& pt, double newT);
void addTCancel(const SkPoint& startPt, const SkPoint& endPt, SkOpSegment* other);