replicate.h

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/* Copyright (c) 2008-2022 the MRtrix3 contributors.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Covered Software is provided under this License on an "as is"
 * basis, without warranty of any kind, either expressed, implied, or
 * statutory, including, without limitation, warranties that the
 * Covered Software is free of defects, merchantable, fit for a
 * particular purpose or non-infringing.
 * See the Mozilla Public License v. 2.0 for more details.
 *
 * For more details, see http://www.mrtrix.org/.
 */
 
#ifndef __adapter_replicate_h__
#define __adapter_replicate_h__
 
#include "header.h"
#include "image_helpers.h"
#include "adapter/base.h"
 
namespace MR
{
    namespace Adapter
    {
 
    template <class ImageType>
      class Replicate :
        public Base<Replicate<ImageType>,ImageType>
    { MEMALIGN(Replicate<ImageType>)
      public:
 
        using base_type = Base<Replicate<ImageType>, ImageType>;
        using value_type = typename ImageType::value_type;
 
        using base_type::name;
        using base_type::ndim;
        using base_type::spacing;
 
          Replicate (ImageType& original, const Header& replication_template) :
            base_type (original),
            header_ (replication_template),
            pos_ (std::max<size_t> (parent().ndim(), header_.ndim()), 0)
          {
            for (size_t n = 0; n < std::min<size_t> (parent().ndim(), header_.ndim()); ++n) {
              if (n < parent().ndim())
                parent().index(n) = 0;
              if (parent().size(n) > 1 && parent().size(n) != header_.size(n))
                throw Exception ("cannot replicate over non-singleton dimensions");
            }
          }
 
        size_t ndim () const {
          return header_.ndim();
        }
        ssize_t size (size_t axis) const {
          return header_.size (axis);
        }
        float spacing (size_t axis) const {
          return header_.spacing(axis);
        }
        ssize_t stride (size_t axis) const {
          return axis < parent().ndim() ? parent().stride (axis) : 0;
        }
 
        ssize_t get_index (size_t axis) const {
          return pos_[axis];
        }
        void move_index (size_t axis, ssize_t increment) {
          pos_[axis] += increment;
          if (axis < parent().ndim())
            if (parent().size(axis) > 1)
              parent().index(axis) += increment;
        }
 
      protected:
        using base_type::parent;
        Header header_;
        vector<ssize_t> pos_;
 
    };
 
    }
}
 
#endif