remove prototype pathops code

experimental/Intersection/CubicUtilities.h

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