1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkPathOpsQuad_DEFINED 9 #define SkPathOpsQuad_DEFINED 10 11 #include "SkPathOpsPoint.h" 12 13 struct SkDQuadPair { 14 const SkDQuad& first() const { return (const SkDQuad&) pts[0]; } 15 const SkDQuad& second() const { return (const SkDQuad&) pts[2]; } 16 SkDPoint pts[5]; 17 }; 18 19 struct SkDQuad { 20 SkDPoint fPts[3]; 21 22 SkDQuad flip() const { 23 SkDQuad result = {{fPts[2], fPts[1], fPts[0]}}; 24 return result; 25 } 26 27 void set(const SkPoint pts[3]) { 28 fPts[0] = pts[0]; 29 fPts[1] = pts[1]; 30 fPts[2] = pts[2]; 31 } 32 33 const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 3); return fPts[n]; } 34 SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 3); return fPts[n]; } 35 36 static int AddValidTs(double s[], int realRoots, double* t); 37 void align(int endIndex, SkDPoint* dstPt) const; 38 SkDQuadPair chopAt(double t) const; 39 SkDVector dxdyAtT(double t) const; 40 static int FindExtrema(double a, double b, double c, double tValue[1]); 41 bool isLinear(int startIndex, int endIndex) const; 42 bool monotonicInY() const; 43 double nearestT(const SkDPoint&) const; 44 bool pointInHull(const SkDPoint&) const; 45 SkDPoint ptAtT(double t) const; 46 static int RootsReal(double A, double B, double C, double t[2]); 47 static int RootsValidT(const double A, const double B, const double C, double s[2]); 48 static void SetABC(const double* quad, double* a, double* b, double* c); 49 SkDQuad subDivide(double t1, double t2) const; 50 static SkDQuad SubDivide(const SkPoint a[3], double t1, double t2) { 51 SkDQuad quad; 52 quad.set(a); 53 return quad.subDivide(t1, t2); 54 } 55 SkDPoint subDivide(const SkDPoint& a, const SkDPoint& c, double t1, double t2) const; 56 static SkDPoint SubDivide(const SkPoint pts[3], const SkDPoint& a, const SkDPoint& c, 57 double t1, double t2) { 58 SkDQuad quad; 59 quad.set(pts); 60 return quad.subDivide(a, c, t1, t2); 61 } 62 SkDCubic toCubic() const; 63 SkDPoint top(double startT, double endT) const; 64 private: 65 // static double Tangent(const double* quadratic, double t); // uncalled 66 }; 67 68 #endif 69
