path ops -- handle non-finite numbers

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"
 #include "SkTDArray.h"
 
 class SkOpEdgeBuilder {
 public:
     SkOpEdgeBuilder(const SkPathWriter& path, SkTArray<SkOpContour>& contours)
         : fPath(path.nativePath())
         , fContours(contours) {
         init();
     }
 
     SkOpEdgeBuilder(const SkPath& path, SkTArray<SkOpContour>& contours)
         : fPath(&path)
-        , fContours(contours) {
+        , fContours(contours)
+        , fAllowOpenContours(false) {
         init();
     }
 
     void complete() {
         if (fCurrentContour && fCurrentContour->segments().count()) {
             fCurrentContour->complete();
             fCurrentContour = NULL;
         }
     }
 
     SkPathOpsMask xorMask() const {
         return fXorMask[fOperand];
     }
 
     void addOperand(const SkPath& path);
-    void finish();
+    bool finish();
     void init();
+    void setAllowOpenContours(bool allow) {
+        fAllowOpenContours = allow;
+    }
 
 private:
+    bool close();
     int preFetch();
-    void walk();
+    bool walk();
 
     const SkPath* fPath;
-    SkTDArray<SkPoint> fPathPts;  // FIXME: point directly to path pts instead
-    SkTDArray<uint8_t> fPathVerbs;  // FIXME: remove
+    SkTDArray<SkPoint> fPathPts;
+    SkTDArray<uint8_t> fPathVerbs;
     SkOpContour* fCurrentContour;
     SkTArray<SkOpContour>& fContours;
     SkTDArray<SkPoint> fReducePts;  // segments created on the fly
     SkTDArray<int> fExtra;  // -1 marks new contour, > 0 offsets into contour
     SkPathOpsMask fXorMask[2];
+    const SkPoint* fFinalCurveStart;
+    const SkPoint* fFinalCurveEnd;
     int fSecondHalf;
     bool fOperand;
+    bool fAllowOpenContours;
 };
 
 #endif