1304bb25aa
git-svn-id: http://skia.googlecode.com/svn/trunk@8137 2bbb7eff-a529-9590-31e7-b0007b416f81
47 lines
1.9 KiB
C
47 lines
1.9 KiB
C
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#if !defined CUBIC_UTILITIES_H
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#define CUBIC_UTILITIES_H
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#include "DataTypes.h"
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#include "SkTDArray.h"
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double calcPrecision(const Cubic& cubic);
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#if SK_DEBUG
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double calcPrecision(const Cubic& cubic, double t, double scale);
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#endif
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void chop_at(const Cubic& src, CubicPair& dst, double t);
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bool clockwise(const Cubic& c);
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double cube_root(double x);
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int cubic_to_quadratics(const Cubic& cubic, double precision,
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SkTDArray<Quadratic>& quadratics);
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void cubic_to_quadratics(const Cubic& cubic, double precision, SkTDArray<double>& ts);
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void coefficients(const double* cubic, double& A, double& B, double& C, double& D);
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bool controls_contained_by_ends(const Cubic& c);
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int cubicRootsValidT(double A, double B, double C, double D, double t[3]);
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int cubicRootsReal(double A, double B, double C, double D, double s[3]);
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void demote_cubic_to_quad(const Cubic& cubic, Quadratic& quad);
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double dx_at_t(const Cubic& , double t);
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double dy_at_t(const Cubic& , double t);
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//void dxdy_at_t(const Cubic& , double t, _Point& y);
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_Vector dxdy_at_t(const Cubic& cubic, double t);
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bool ends_are_extrema_in_x_or_y(const Cubic& );
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int find_cubic_inflections(const Cubic& src, double tValues[]);
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int find_cubic_max_curvature(const Cubic& src, double tValues[]);
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bool monotonic_in_y(const Cubic& c);
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bool rotate(const Cubic& cubic, int zero, int index, Cubic& rotPath);
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bool serpentine(const Cubic& c);
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void sub_divide(const Cubic& src, double t1, double t2, Cubic& dst);
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void sub_divide(const Cubic& , const _Point& a, const _Point& d, double t1, double t2, _Point [2]);
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_Point top(const Cubic& , double startT, double endT);
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void xy_at_t(const Cubic& , double t, double& x, double& y);
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_Point xy_at_t(const Cubic& , double t);
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extern const int gPrecisionUnit;
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#endif
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