| 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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