2 * Copyright 2012 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkPathOpsQuad_DEFINED
9 #define SkPathOpsQuad_DEFINED
11 #include "SkPathOpsPoint.h"
14 const SkDQuad& first() const { return (const SkDQuad&) pts[0]; }
15 const SkDQuad& second() const { return (const SkDQuad&) pts[2]; }
22 SkDQuad flip() const {
23 SkDQuad result = {{fPts[2], fPts[1], fPts[0]}};
27 void set(const SkPoint pts[3]) {
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]; }
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) {
53 return quad.subDivide(t1, t2);
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) {
60 return quad.subDivide(a, c, t1, t2);
62 SkDCubic toCubic() const;
63 SkDPoint top(double startT, double endT) const;
65 // utilities callable by the user from the debugger when the implementation code is linked in
67 void dumpComma(const char*) const;
70 // static double Tangent(const double* quadratic, double t); // uncalled