path ops -- rewrite angle sort

src/pathops/SkPathOpsCubic.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 SkPathOpsCubic_DEFINED
 #define SkPathOpsCubic_DEFINED
 
+#include "SkPath.h"
 #include "SkPathOpsPoint.h"
 #include "SkTDArray.h"
 
 struct SkDCubicPair {
     const SkDCubic& first() const { return (const SkDCubic&) pts[0]; }
     const SkDCubic& second() const { return (const SkDCubic&) pts[3]; }
     SkDPoint pts[7];
 };
 
 struct SkDCubic {
     SkDPoint fPts[4];
 
     void set(const SkPoint pts[4]) {
         fPts[0] = pts[0];
         fPts[1] = pts[1];
         fPts[2] = pts[2];
         fPts[3] = pts[3];
     }
 
     static const int gPrecisionUnit;
 
     const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 4); return fPts[n]; }
     SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 4); return fPts[n]; }
 
+    void align(int endIndex, int ctrlIndex, SkDPoint* dstPt) const; 
     double calcPrecision() const;
     SkDCubicPair chopAt(double t) const;
     bool clockwise() const;
     static void Coefficients(const double* cubic, double* A, double* B, double* C, double* D);
     bool controlsContainedByEnds() const;
     SkDVector dxdyAtT(double t) const;
     bool endsAreExtremaInXOrY() const;
     static int FindExtrema(double a, double b, double c, double d, double tValue[2]);
     int findInflections(double tValues[]) const;
 
@@ skipping 26 matching lines @@
         cubic.subDivide(a, d, t1, t2, p);
     }
 
     SkDPoint top(double startT, double endT) const;
     void toQuadraticTs(double precision, SkTDArray<double>* ts) const;
     SkDQuad toQuad() const;
     SkDPoint xyAtT(double t) const;
 };
 
 #endif