abort op early if path isn't parseable

src/pathops/SkOpEdgeBuilder.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 SkOpEdgeBuilder_DEFINED
 #define SkOpEdgeBuilder_DEFINED
 
 #include "SkOpContour.h"
 #include "SkPathWriter.h"
 #include "SkTArray.h"
 
 class SkOpEdgeBuilder {
 public:
     SkOpEdgeBuilder(const SkPathWriter& path, SkTArray<SkOpContour>& contours)
         : fPath(path.nativePath())
         , fContours(contours)
         , fAllowOpenContours(true) {
         init();
     }
 
     SkOpEdgeBuilder(const SkPath& path, SkTArray<SkOpContour>& contours)
         : fPath(&path)
         , fContours(contours)
         , fAllowOpenContours(false) {
         init();
     }
 
+    void addOperand(const SkPath& path);
+
     void complete() {
         if (fCurrentContour && fCurrentContour->segments().count()) {
             fCurrentContour->complete();
             fCurrentContour = NULL;
         }
     }
 
-    SkPathOpsMask xorMask() const {
-        return fXorMask[fOperand];
-    }
-
-    void addOperand(const SkPath& path);
     bool finish();
     void init();
+    bool unparseable() const { return fUnparseable; }
+    SkPathOpsMask xorMask() const { return fXorMask[fOperand]; }
 
 private:
     void closeContour(const SkPoint& curveEnd, const SkPoint& curveStart);
     bool close();
     int preFetch();
     bool walk();
 
     const SkPath* fPath;
     SkTArray<SkPoint, true> fPathPts;
     SkTArray<uint8_t, true> fPathVerbs;
     SkOpContour* fCurrentContour;
     SkTArray<SkOpContour>& fContours;
     SkPathOpsMask fXorMask[2];
     int fSecondHalf;
     bool fOperand;
     bool fAllowOpenContours;
     bool fUnparseable;
 };
 
 #endif