blob: 1037cae4f759f94e5c01a3bd3784a44c16ceb3d5 [file] [log] [blame]
 /* * 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 { enum SearchAxis { kXAxis, kYAxis }; 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 binarySearch(double min, double max, double axisIntercept, SearchAxis xAxis) 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[2]) const; static int FindInflections(const SkPoint a[4], double tValues[2]) { 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]); int searchRoots(double extremes[6], int extrema, double axisIntercept, SearchAxis xAxis, double* validRoots) const; bool serpentine() const; void set(const SkPoint pts[4]) { fPts[0] = pts[0]; fPts[1] = pts[1]; fPts[2] = pts[2]; fPts[3] = pts[3]; } 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* ts) const; SkDQuad toQuad() const; // utilities callable by the user from the debugger when the implementation code is linked in void dump() const; void dumpNumber() const; static const int gPrecisionUnit; SkDPoint fPts[4]; }; #endif