Rewriting path writer

src/pathops/SkOpSegment.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkOpSegment_DEFINE
 #define SkOpSegment_DEFINE
 
 #include "SkOpAngle.h"
@@ skipping 250 matching lines @@
     bool isVertical() const {
         return fBounds.fLeft == fBounds.fRight;
     }
 
     bool isVertical(SkOpSpanBase* start, SkOpSpanBase* end) const {
         return (*CurveIsVertical[fVerb])(fPts, fWeight, start->t(), end->t());
     }
 
     bool isXor() const;
 
+    void joinEnds(SkOpSegment* start) {
+        fTail.ptT()->addOpp(start->fHead.ptT(), start->fHead.ptT());
+    }
+
     const SkPoint& lastPt() const {
         return fPts[SkPathOpsVerbToPoints(fVerb)];
     }
 
     void markAllDone();
     SkOpSpanBase* markAndChaseDone(SkOpSpanBase* start, SkOpSpanBase* end);
     bool markAndChaseWinding(SkOpSpanBase* start, SkOpSpanBase* end, int winding,
             SkOpSpanBase** lastPtr);
     bool markAndChaseWinding(SkOpSpanBase* start, SkOpSpanBase* end, int winding,
             int oppWinding, SkOpSpanBase** lastPtr);
@@ skipping 170 matching lines @@
     mutable SkScalar fDebugBaseMin;  // if > 0, the 1st t value in this seg vis-a-vis the ref seg
     mutable SkScalar fDebugBaseMax;
     mutable int fDebugLastIndex;
     mutable SkScalar fDebugLastMin;  // if > 0, the last t -- next t val - base has same sign
     mutable SkScalar fDebugLastMax;
 #endif
     SkDEBUGCODE(int fID);
 };
 
 #endif