pathops version two

src/pathops/SkPathOpsQuad.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 SkPathOpsQuad_DEFINED
 #define SkPathOpsQuad_DEFINED
 
 #include "SkPathOpsPoint.h"
 
 struct SkDQuadPair {
     const SkDQuad& first() const { return (const SkDQuad&) pts[0]; }
     const SkDQuad& second() const { return (const SkDQuad&) pts[2]; }
     SkDPoint pts[5];
 };
 
 struct SkDQuad {
-    SkDPoint fPts[3];
+    static const int kPointCount = 3;
+    static const int kPointLast = kPointCount - 1;
+    static const int kMaxIntersections = 4;
+
+    SkDPoint fPts[kPointCount];
+
+    bool collapsed() const {
+        return fPts[0].approximatelyEqual(fPts[1]) && fPts[0].approximatelyEqual(fPts[2]);
+    }
+
+    bool controlsInside() const {
+        SkDVector v01 = fPts[0] - fPts[1];
+        SkDVector v02 = fPts[0] - fPts[2];
+        SkDVector v12 = fPts[1] - fPts[2];
+        return v02.dot(v01) > 0 && v02.dot(v12) > 0;
+    }
 
     SkDQuad flip() const {
         SkDQuad result = {{fPts[2], fPts[1], fPts[0]}};
         return result;
     }
 
-    void set(const SkPoint pts[3]) {
+    static bool IsCubic() { return false; }
+
+    void set(const SkPoint pts[kPointCount]) {
         fPts[0] = pts[0];
         fPts[1] = pts[1];
         fPts[2] = pts[2];
     }
 
-    const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 3); return fPts[n]; }
-    SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 3); return fPts[n]; }
+    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]; }
 
     static int AddValidTs(double s[], int realRoots, double* t);
     void align(int endIndex, SkDPoint* dstPt) const;
     SkDQuadPair chopAt(double t) const;
     SkDVector dxdyAtT(double t) const;
     static int FindExtrema(double a, double b, double c, double tValue[1]);
+    bool hullIntersects(const SkDQuad& , bool* isLinear) const;
     bool isLinear(int startIndex, int endIndex) const;
     bool monotonicInY() const;
     double nearestT(const SkDPoint&) const;
-    bool pointInHull(const SkDPoint&) const;
+    void otherPts(int oddMan, const SkDPoint* endPt[2]) const;
     SkDPoint ptAtT(double t) const;
     static int RootsReal(double A, double B, double C, double t[2]);
     static int RootsValidT(const double A, const double B, const double C, double s[2]);
     static void SetABC(const double* quad, double* a, double* b, double* c);
     SkDQuad subDivide(double t1, double t2) const;
-    static SkDQuad SubDivide(const SkPoint a[3], double t1, double t2) {
+    static SkDQuad SubDivide(const SkPoint a[kPointCount], double t1, double t2) {
         SkDQuad quad;
         quad.set(a);
         return quad.subDivide(t1, t2);
     }
     SkDPoint subDivide(const SkDPoint& a, const SkDPoint& c, double t1, double t2) const;
-    static SkDPoint SubDivide(const SkPoint pts[3], const SkDPoint& a, const SkDPoint& c,
+    static SkDPoint SubDivide(const SkPoint pts[kPointCount], const SkDPoint& a, const SkDPoint& c,
                               double t1, double t2) {
         SkDQuad quad;
         quad.set(pts);
         return quad.subDivide(a, c, t1, t2);
     }
     SkDCubic toCubic() const;
     SkDPoint top(double startT, double endT) const;
 
     // utilities callable by the user from the debugger when the implementation code is linked in
     void dump() const;
-    void dumpComma(const char*) const;
+    void dumpID(int id) const;
+    void dumpInner() const;
 
 private:
 //  static double Tangent(const double* quadratic, double t);  // uncalled
 };
 
 #endif