path ops: fix conic weight and partial coincidence

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 23 matching lines @@
 
     bool controlsInside() const {
         SkDVector v01 = fPts[0] - fPts[1];
         SkDVector v02 = fPts[0] - fPts[2];
         SkDVector v03 = fPts[0] - fPts[3];
         SkDVector v13 = fPts[1] - fPts[3];
         SkDVector v23 = fPts[2] - fPts[3];
         return v03.dot(v01) > 0 && v03.dot(v02) > 0 && v03.dot(v13) > 0 && v03.dot(v23) > 0;
     }
 
-    static bool IsCubic() { return true; }
+    static bool IsConic() { return false; }
 
     const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < kPointCount); return fPts[n]; }
     SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < kPointCount); return fPts[n]; }
 
     void align(int endIndex, int ctrlIndex, SkDPoint* dstPt) const;
     double binarySearch(double min, double max, double axisIntercept, SearchAxis xAxis) const;
     double calcPrecision() const;
     SkDCubicPair chopAt(double t) const;
     static void Coefficients(const double* cubic, double* A, double* B, double* C, double* D);
     static bool ComplexBreak(const SkPoint pts[4], SkScalar* t);
@@ skipping 86 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