sparse_image_solver.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_2d_sparse_image_solver_hh
#define mia_2d_sparse_image_solver_hh

#include <mia/core/factory.hh>
#include <mia/core/sparse_solver.hh>
#include <mia/2d/image.hh>

NS_MIA_BEGIN

typedef TSparseSolver<C2DFImage> C2DImageSparseSolver; 

typedef std::shared_ptr<C2DImageSparseSolver > P2DImageSparseSolver;

typedef THandlerSingleton<TFactoryPluginHandler<TFactory<C2DImageSparseSolver> > > C2DImageSparseSolverPluginHandler;

typedef C2DImageSparseSolver::A_mult_x C2DImageSolverAmultx; 

typedef std::shared_ptr<C2DImageSolverAmultx> P2DImageSolverAmultx;

typedef TFactory<C2DImageSolverAmultx> C2DImageSolverAmultxPlugin;

typedef THandlerSingleton<TFactoryPluginHandler<C2DImageSolverAmultxPlugin> > C2DImageSolverAmultxPluginHandler;



template <typename T>
struct multiply<T2DImage<T> > {
        static void apply(T2DImage<T>& result, const typename TSparseSolver<T2DImage<T> >::A_mult_x& A, const T2DImage<T>& x);
}; 

template <typename T>
void multiply<T2DImage<T> >::apply(T2DImage<T>& result, const typename TSparseSolver<T2DImage<T> >::A_mult_x& A, const T2DImage<T>& X)
{
        assert(result.get_size() == X.get_size()); 
        assert(result.get_size() == A.get_size());

        long b = A.get_boundary_size(); 
        long nx = X.get_size().x - 2 * b; 
        long ny = X.get_size().y - 2 * b; 
        copy(X.begin(), X.begin() + b * X.get_size().x + b, result.begin()); 
        auto ir = result.begin() + b * X.get_size().x + b; 
        auto ix = X.begin() + b * X.get_size().x + b; 
                
        for (int y = 0; y < ny; ++y) {
                int x = 0; 
                for (; x < nx; ++x, ++ix, ++ir)
                        *ir = static_cast<T>(A(ix));
                for (; x < (int)X.get_size().x; ++x, ++ix, ++ir) 
                        *ir = *ix; 
        }
        copy(ix, X.end(), ir); 
}

FACTORY_TRAIT(C2DImageSparseSolverPluginHandler); 
FACTORY_TRAIT(C2DImageSolverAmultxPluginHandler); 


NS_MIA_END

#endif