| /* |
| * 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 |
| |
| #include "SkPath.h" |
| #include "SkPathOpsPoint.h" |
| #include "SkTArray.h" |
| |
| struct SkDCubicPair { |
| const SkDCubic& first() const { return (const SkDCubic&) pts[0]; } |
| const SkDCubic& second() const { return (const SkDCubic&) pts[3]; } |
| SkDPoint pts[7]; |
| }; |
| |
| struct SkDCubic { |
| SkDPoint fPts[4]; |
| |
| void set(const SkPoint pts[4]) { |
| fPts[0] = pts[0]; |
| fPts[1] = pts[1]; |
| fPts[2] = pts[2]; |
| fPts[3] = pts[3]; |
| } |
| |
| static const int gPrecisionUnit; |
| |
| const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 4); return fPts[n]; } |
| SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 4); return fPts[n]; } |
| |
| void align(int endIndex, int ctrlIndex, SkDPoint* dstPt) const; |
| double calcPrecision() const; |
| SkDCubicPair chopAt(double t) const; |
| bool clockwise() const; |
| static void Coefficients(const double* cubic, double* A, double* B, double* C, double* D); |
| bool controlsContainedByEnds() const; |
| SkDVector dxdyAtT(double t) const; |
| bool endsAreExtremaInXOrY() const; |
| static int FindExtrema(double a, double b, double c, double d, double tValue[2]); |
| int findInflections(double tValues[]) const; |
| |
| static int FindInflections(const SkPoint a[4], double tValues[]) { |
| SkDCubic cubic; |
| cubic.set(a); |
| return cubic.findInflections(tValues); |
| } |
| |
| int findMaxCurvature(double tValues[]) const; |
| bool isLinear(int startIndex, int endIndex) const; |
| bool monotonicInY() const; |
| SkDPoint ptAtT(double t) const; |
| static int RootsReal(double A, double B, double C, double D, double t[3]); |
| static int RootsValidT(const double A, const double B, const double C, double D, double s[3]); |
| bool serpentine() const; |
| SkDCubic subDivide(double t1, double t2) const; |
| |
| static SkDCubic SubDivide(const SkPoint a[4], double t1, double t2) { |
| SkDCubic cubic; |
| cubic.set(a); |
| return cubic.subDivide(t1, t2); |
| } |
| |
| void subDivide(const SkDPoint& a, const SkDPoint& d, double t1, double t2, SkDPoint p[2]) const; |
| |
| static void SubDivide(const SkPoint pts[4], const SkDPoint& a, const SkDPoint& d, double t1, |
| double t2, SkDPoint p[2]) { |
| SkDCubic cubic; |
| cubic.set(pts); |
| cubic.subDivide(a, d, t1, t2, p); |
| } |
| |
| SkDPoint top(double startT, double endT) const; |
| void toQuadraticTs(double precision, SkTArray<double, true>* ts) const; |
| SkDQuad toQuad() const; |
| |
| #ifdef SK_DEBUG |
| void dump(); |
| #endif |
| }; |
| |
| #endif |