add conics to path ops

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
 
@@ skipping 52 matching lines @@
     int findInflections(double tValues[2]) const;
 
     static int FindInflections(const SkPoint a[kPointCount], double tValues[2]) {
         SkDCubic cubic;
         cubic.set(a);
         return cubic.findInflections(tValues);
     }
 
     int findMaxCurvature(double tValues[]) const;
     bool hullIntersects(const SkDCubic& c2, bool* isLinear) const;
+    bool hullIntersects(const SkDConic& c, bool* isLinear) const;
+    bool hullIntersects(const SkDQuad& c2, bool* isLinear) const;
+    bool hullIntersects(const SkDPoint* pts, int ptCount, bool* isLinear) const;
     bool isLinear(int startIndex, int endIndex) const;
     bool monotonicInY() const;
     void otherPts(int index, const SkDPoint* o1Pts[kPointCount - 1]) const;
     SkDPoint ptAtT(double t) const;
     static int RootsReal(double A, double B, double C, double D, double t[3]);
     static int RootsValidT(const double A, const double B, const double C, double D, double s[3]);
 
     int searchRoots(double extremes[6], int extrema, double axisIntercept,
                     SearchAxis xAxis, double* validRoots) const;
 
-    void set(const SkPoint pts[kPointCount]) {
+    const SkDCubic& set(const SkPoint pts[kPointCount]) {
         fPts[0] = pts[0];
         fPts[1] = pts[1];
         fPts[2] = pts[2];
         fPts[3] = pts[3];
+        return *this;
     }
 
     SkDCubic subDivide(double t1, double t2) const;
 
     static SkDCubic SubDivide(const SkPoint a[kPointCount], double t1, double t2) {
         SkDCubic cubic;
         cubic.set(a);
         return cubic.subDivide(t1, t2);
     }
 
@@ skipping 26 matching lines @@
    returned == 3 for (0, 1), (0, 2), (1, 3), (2, 3)
 given that:
    (0, 3) ^ 2 -> (2, 1)  (1, 2) ^ 2 -> (3, 0)
    (0, 1) ^ 3 -> (3, 2)  (0, 2) ^ 3 -> (3, 1)  (1, 3) ^ 3 -> (2, 0)  (2, 3) ^ 3 -> (1, 0)
 */
 inline int other_two(int one, int two) {
     return 1 >> (3 - (one ^ two)) ^ 3;
 }
 
 #endif