58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2017 Daniele Panozzo <daniele.panozzo@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 "slice_cached.h"
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#include <iostream>
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#include <vector>
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#include <utility>
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#include "slice.h"
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template <typename TX, typename TY, typename DerivedI>
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IGL_INLINE void igl::slice_cached_precompute(
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const Eigen::SparseMatrix<TX>& X,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & R,
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const Eigen::Matrix<int,Eigen::Dynamic,1> & C,
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Eigen::MatrixBase<DerivedI>& data,
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Eigen::SparseMatrix<TY>& Y
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)
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{
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// Create a sparse matrix whose entries are the ids
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Eigen::SparseMatrix<unsigned> TS = X.template cast<unsigned>();
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TS.makeCompressed();
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for (unsigned i=0;i<TS.nonZeros();++i)
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*(TS.valuePtr() + i) = i;
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Eigen::SparseMatrix<unsigned> TS_sliced;
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igl::slice(TS,R,C,TS_sliced);
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Y = TS_sliced.cast<TY>();
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data.resize(TS_sliced.nonZeros());
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for (unsigned i=0;i<data.size();++i)
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{
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data[i] = *(TS_sliced.valuePtr() + i);
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*(Y.valuePtr() + i) = *(X.valuePtr() + data[i]);
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}
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}
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template <typename TX, typename TY, typename DerivedI>
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IGL_INLINE void igl::slice_cached(
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const Eigen::SparseMatrix<TX>& X,
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const Eigen::MatrixBase<DerivedI>& data,
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Eigen::SparseMatrix<TY>& Y
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)
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{
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for (unsigned i=0; i<data.size(); ++i)
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*(Y.valuePtr() + i) = *(X.valuePtr() + data[i]);
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::slice_cached<double, double, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::SparseMatrix<double, 0, int> const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> > const&, Eigen::SparseMatrix<double, 0, int>&);
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template void igl::slice_cached_precompute<double, double, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::SparseMatrix<double, 0, int> const&, Eigen::Matrix<int, -1, 1, 0, -1, 1> const&, Eigen::Matrix<int, -1, 1, 0, -1, 1> const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&, Eigen::SparseMatrix<double, 0, int>&);
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#endif
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