add pathops debugging

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 148 matching lines @@
     void debugShowActiveSpans() const;
 #endif
 #if DEBUG_MARK_DONE
     void debugShowNewWinding(const char* fun, const SkOpSpan* span, int winding);
     void debugShowNewWinding(const char* fun, const SkOpSpan* span, int winding, int oppWinding);
 #endif
 
     const SkOpSpanBase* debugSpan(int id) const;
     void debugValidate() const;
 
+#if DEBUG_COINCIDENCE_ORDER
+    void debugResetCoinT() const; 
+    void debugSetCoinT(int, SkScalar ) const; 
+#endif
+
 #if DEBUG_COINCIDENCE
-    static void SkOpSegment::DebugClearVisited(const SkOpSpanBase* span);
+    static void DebugClearVisited(const SkOpSpanBase* span);
 
     bool debugVisited() const {
         if (!fDebugVisited) {
             fDebugVisited = true;
             return false;
         }
         return true;
     }
 #endif
 
@@ skipping 248 matching lines @@
     SkPoint* fPts;  // pointer into array of points owned by edge builder that may be tweaked
     SkPathOpsBounds fBounds;  // tight bounds
     SkScalar fWeight;
     int fCount;  // number of spans (one for a non-intersecting segment)
     int fDoneCount;  // number of processed spans (zero initially)
     SkPath::Verb fVerb;
     bool fVisited;  // used by missing coincidence check
 #if DEBUG_COINCIDENCE
     mutable bool fDebugVisited;  // used by debug missing coincidence check
 #endif
+#if DEBUG_COINCIDENCE_ORDER
+    mutable int fDebugBaseIndex;
+    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