1 | // This file is part of Eigen, a lightweight C++ template library
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2 | // for linear algebra.
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3 | //
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4 | // Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
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5 | //
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6 | // This Source Code Form is subject to the terms of the Mozilla
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7 | // Public License v. 2.0. If a copy of the MPL was not distributed
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8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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9 |
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10 | #ifndef EIGEN_MISC_IMAGE_H
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11 | #define EIGEN_MISC_IMAGE_H
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12 |
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13 | namespace Eigen {
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14 |
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15 | namespace internal {
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16 |
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17 | /** \class image_retval_base
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18 | *
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19 | */
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20 | template<typename DecompositionType>
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21 | struct traits<image_retval_base<DecompositionType> >
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22 | {
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23 | typedef typename DecompositionType::MatrixType MatrixType;
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24 | typedef Matrix<
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25 | typename MatrixType::Scalar,
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26 | MatrixType::RowsAtCompileTime, // the image is a subspace of the destination space, whose
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27 | // dimension is the number of rows of the original matrix
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28 | Dynamic, // we don't know at compile time the dimension of the image (the rank)
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29 | MatrixType::Options,
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30 | MatrixType::MaxRowsAtCompileTime, // the image matrix will consist of columns from the original matrix,
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31 | MatrixType::MaxColsAtCompileTime // so it has the same number of rows and at most as many columns.
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32 | > ReturnType;
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33 | };
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34 |
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35 | template<typename _DecompositionType> struct image_retval_base
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36 | : public ReturnByValue<image_retval_base<_DecompositionType> >
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37 | {
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38 | typedef _DecompositionType DecompositionType;
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39 | typedef typename DecompositionType::MatrixType MatrixType;
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40 | typedef ReturnByValue<image_retval_base> Base;
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41 | typedef typename Base::Index Index;
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42 |
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43 | image_retval_base(const DecompositionType& dec, const MatrixType& originalMatrix)
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44 | : m_dec(dec), m_rank(dec.rank()),
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45 | m_cols(m_rank == 0 ? 1 : m_rank),
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46 | m_originalMatrix(originalMatrix)
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47 | {}
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48 |
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49 | inline Index rows() const { return m_dec.rows(); }
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50 | inline Index cols() const { return m_cols; }
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51 | inline Index rank() const { return m_rank; }
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52 | inline const DecompositionType& dec() const { return m_dec; }
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53 | inline const MatrixType& originalMatrix() const { return m_originalMatrix; }
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54 |
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55 | template<typename Dest> inline void evalTo(Dest& dst) const
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56 | {
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57 | static_cast<const image_retval<DecompositionType>*>(this)->evalTo(dst);
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58 | }
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59 |
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60 | protected:
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61 | const DecompositionType& m_dec;
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62 | Index m_rank, m_cols;
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63 | const MatrixType& m_originalMatrix;
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64 | };
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65 |
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66 | } // end namespace internal
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67 |
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68 | #define EIGEN_MAKE_IMAGE_HELPERS(DecompositionType) \
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69 | typedef typename DecompositionType::MatrixType MatrixType; \
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70 | typedef typename MatrixType::Scalar Scalar; \
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71 | typedef typename MatrixType::RealScalar RealScalar; \
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72 | typedef typename MatrixType::Index Index; \
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73 | typedef Eigen::internal::image_retval_base<DecompositionType> Base; \
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74 | using Base::dec; \
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75 | using Base::originalMatrix; \
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76 | using Base::rank; \
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77 | using Base::rows; \
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78 | using Base::cols; \
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79 | image_retval(const DecompositionType& dec, const MatrixType& originalMatrix) \
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80 | : Base(dec, originalMatrix) {}
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81 |
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82 | } // end namespace Eigen
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83 |
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84 | #endif // EIGEN_MISC_IMAGE_H
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