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72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "hsv_to_rgb.h"
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#include <cmath>
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template <typename T>
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IGL_INLINE void igl::hsv_to_rgb(const T * hsv, T * rgb)
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{
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igl::hsv_to_rgb(
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hsv[0],hsv[1],hsv[2],
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rgb[0],rgb[1],rgb[2]);
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}
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template <typename T>
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IGL_INLINE void igl::hsv_to_rgb(
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const T & h, const T & s, const T & v,
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T & r, T & g, T & b)
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{
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// From medit
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double f,p,q,t,hh;
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int i;
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hh = ((int)h % 360) / 60.;
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i = (int)std::floor(hh); /* largest int <= h */
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f = hh - i; /* fractional part of h */
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p = v * (1.0 - s);
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q = v * (1.0 - (s * f));
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t = v * (1.0 - (s * (1.0 - f)));
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switch(i) {
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case 0: r = v; g = t; b = p; break;
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case 1: r = q; g = v; b = p; break;
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case 2: r = p; g = v; b = t; break;
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case 3: r = p; g = q; b = v; break;
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case 4: r = t; g = p; b = v; break;
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case 5: r = v; g = p; b = q; break;
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}
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}
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template <typename DerivedH, typename DerivedR>
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void igl::hsv_to_rgb(
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const Eigen::PlainObjectBase<DerivedH> & H,
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Eigen::PlainObjectBase<DerivedR> & R)
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{
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assert(H.cols() == 3);
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R.resizeLike(H);
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for(typename DerivedH::Index r = 0;r<H.rows();r++)
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{
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typename DerivedH::Scalar hsv[3];
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hsv[0] = H(r,0);
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hsv[1] = H(r,1);
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hsv[2] = H(r,2);
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typename DerivedR::Scalar rgb[] = {0,0,0};
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hsv_to_rgb(hsv,rgb);
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R(r,0) = rgb[0];
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R(r,1) = rgb[1];
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R(r,2) = rgb[2];
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}
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::hsv_to_rgb<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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template void igl::hsv_to_rgb<Eigen::Matrix<float, -1, -1, 0, -1, -1>, Eigen::Matrix<float, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, -1, 0, -1, -1> >&);
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template void igl::hsv_to_rgb<Eigen::Matrix<unsigned char, 64, 3, 1, 64, 3>, Eigen::Matrix<unsigned char, 64, 3, 1, 64, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<unsigned char, 64, 3, 1, 64, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<unsigned char, 64, 3, 1, 64, 3> >&);
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template void igl::hsv_to_rgb<Eigen::Matrix<float, 64, 3, 1, 64, 3>, Eigen::Matrix<float, 64, 3, 1, 64, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<float, 64, 3, 1, 64, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<float, 64, 3, 1, 64, 3> >&);
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template void igl::hsv_to_rgb<double>(double const*, double*);
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#endif
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