michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef SkPathOpsQuad_DEFINED
michael@0: #define SkPathOpsQuad_DEFINED
michael@0: 
michael@0: #include "SkPathOpsPoint.h"
michael@0: 
michael@0: struct SkDQuadPair {
michael@0:     const SkDQuad& first() const { return (const SkDQuad&) pts[0]; }
michael@0:     const SkDQuad& second() const { return (const SkDQuad&) pts[2]; }
michael@0:     SkDPoint pts[5];
michael@0: };
michael@0: 
michael@0: struct SkDQuad {
michael@0:     SkDPoint fPts[3];
michael@0: 
michael@0:     SkDQuad flip() const {
michael@0:         SkDQuad result = {{fPts[2], fPts[1], fPts[0]}};
michael@0:         return result;
michael@0:     }
michael@0: 
michael@0:     void set(const SkPoint pts[3]) {
michael@0:         fPts[0] = pts[0];
michael@0:         fPts[1] = pts[1];
michael@0:         fPts[2] = pts[2];
michael@0:     }
michael@0: 
michael@0:     const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 3); return fPts[n]; }
michael@0:     SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 3); return fPts[n]; }
michael@0: 
michael@0:     static int AddValidTs(double s[], int realRoots, double* t);
michael@0:     void align(int endIndex, SkDPoint* dstPt) const;
michael@0:     SkDQuadPair chopAt(double t) const;
michael@0:     SkDVector dxdyAtT(double t) const;
michael@0:     static int FindExtrema(double a, double b, double c, double tValue[1]);
michael@0:     bool isLinear(int startIndex, int endIndex) const;
michael@0:     bool monotonicInY() const;
michael@0:     double nearestT(const SkDPoint&) const;
michael@0:     bool pointInHull(const SkDPoint&) const;
michael@0:     SkDPoint ptAtT(double t) const;
michael@0:     static int RootsReal(double A, double B, double C, double t[2]);
michael@0:     static int RootsValidT(const double A, const double B, const double C, double s[2]);
michael@0:     static void SetABC(const double* quad, double* a, double* b, double* c);
michael@0:     SkDQuad subDivide(double t1, double t2) const;
michael@0:     static SkDQuad SubDivide(const SkPoint a[3], double t1, double t2) {
michael@0:         SkDQuad quad;
michael@0:         quad.set(a);
michael@0:         return quad.subDivide(t1, t2);
michael@0:     }
michael@0:     SkDPoint subDivide(const SkDPoint& a, const SkDPoint& c, double t1, double t2) const;
michael@0:     static SkDPoint SubDivide(const SkPoint pts[3], const SkDPoint& a, const SkDPoint& c,
michael@0:                               double t1, double t2) {
michael@0:         SkDQuad quad;
michael@0:         quad.set(pts);
michael@0:         return quad.subDivide(a, c, t1, t2);
michael@0:     }
michael@0:     SkDCubic toCubic() const;
michael@0:     SkDPoint top(double startT, double endT) const;
michael@0: 
michael@0: #ifdef SK_DEBUG
michael@0:     void dump();
michael@0: #endif
michael@0: private:
michael@0: //  static double Tangent(const double* quadratic, double t);  // uncalled
michael@0: };
michael@0: 
michael@0: #endif