path ops work in progress

src/pathops/SkOpSpan.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 SkOpSpan_DEFINED
 #define SkOpSpan_DEFINED
 
 #include "SkPoint.h"
 
 class SkOpSegment;
 
 struct SkOpSpan {
+    enum PointMatch {
+        kPointIsExact,
+        kPointIsNear
+    };
     SkOpSegment* fOther;
     SkPoint fPt;  // computed when the curves are intersected
     double fT;
     double fOtherT;  // value at fOther[fOtherIndex].fT
     int fOtherIndex;  // can't be used during intersection
     int fWindSum;  // accumulated from contours surrounding this one.
     int fOppSum;  // for binary operators: the opposite winding sum
     int fWindValue;  // 0 == canceled; 1 == normal; >1 == coincident
     int fOppValue;  // normally 0 -- when binary coincident edges combine, opp value goes here
     bool fDone;  // if set, this span to next higher T has been processed
     bool fUnsortableStart;  // set when start is part of an unsortable pair
     bool fUnsortableEnd;  // set when end is part of an unsortable pair
+    bool fSmall;   // if set, consecutive points are almost equal
     bool fTiny;  // if set, span may still be considered once for edge following
     bool fLoop;  // set when a cubic loops back to this point
+    bool fNear;  // set if point is near segment end point
+
+#ifdef SK_DEBUG
+    void dump() const;
+#endif
 };
 
 #endif