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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_extract_h__
#define __adapter_extract_h__
#include "adapter/base.h"
namespace MR
{
namespace Adapter
{
template <class ImageType>
class Extract1D :
public Base<Extract1D<ImageType>,ImageType>
{ MEMALIGN (Extract1D<ImageType>)
public:
using base_type = Base<Extract1D<ImageType>, ImageType>;
using value_type = typename ImageType::value_type;
using base_type::ndim;
using base_type::spacing;
using base_type::parent;
Extract1D (const ImageType& original, const size_t axis, const vector<uint32_t>& indices) :
base_type (original),
extract_axis (axis),
indices (indices),
nsize (indices.size()),
trans (original.transform()) {
reset();
if (extract_axis < 3) {
Eigen::Vector3d a (0.0, 0.0, 0.0);
a[extract_axis] = indices[0] * spacing (extract_axis);
trans.translation() = trans * a;
}
this->indices.push_back (indices.back());
}
void reset () {
for (size_t n = 0; n < ndim(); ++n)
parent().index(n) = ( n == extract_axis ? indices[0] : 0 );
current_pos = 0;
}
ssize_t size (size_t axis) const {
return ( axis == extract_axis ? nsize : base_type::size (axis) );
}
const transform_type& transform () const { return trans; }
ssize_t get_index (size_t axis) const { return ( axis == extract_axis ? current_pos : parent().index(axis) ); }
void move_index (size_t axis, ssize_t increment) {
if (axis == extract_axis) {
ssize_t prev_pos = current_pos < nsize ? indices[current_pos] : 0;
current_pos += increment;
if (current_pos < nsize)
parent().index(axis) += indices[current_pos] - prev_pos;
else
parent().index(axis) = 0;
}
else
parent().index(axis) += increment;
}
friend std::ostream& operator<< (std::ostream& stream, const Extract1D& V) {
stream << "Extract1D adapter for image \"" << V.name() << "\", position [ ";
for (size_t n = 0; n < V.ndim(); ++n)
stream << V.index(n) << " ";
stream << "], value = " << V.value();
return stream;
}
private:
const size_t extract_axis;
vector<uint32_t> indices;
const ssize_t nsize;
transform_type trans;
ssize_t current_pos;
};
template <class ImageType>
class Extract :
public Base<Extract<ImageType>,ImageType>
{ MEMALIGN (Extract<ImageType>)
public:
using base_type = Base<Extract<ImageType>, ImageType>;
using value_type = typename ImageType::value_type;
using base_type::ndim;
using base_type::spacing;
using base_type::parent;
Extract (const ImageType& original, const vector<vector<uint32_t>>& indices) :
base_type (original),
current_pos (ndim()),
indices (indices),
trans (original.transform()) {
reset();
trans.translation() = trans * Eigen::Vector3d (
indices[0][0] * spacing (0),
indices[1][0] * spacing (1),
indices[2][0] * spacing (2)
);
for (const auto& i : indices)
sizes.push_back (i.size());
}
ssize_t size (size_t axis) const { return sizes[axis]; }
const transform_type& transform () const { return trans; }
void reset () {
for (size_t n = 0; n < ndim(); ++n) {
current_pos[n] = 0;
parent().index(n) = indices[n][0];
}
}
ssize_t get_index (size_t axis) const { return current_pos[axis]; }
void move_index (size_t axis, ssize_t increment) {
current_pos[axis] += increment;
if (current_pos[axis] < 0)
parent().index (axis) = -1;
else if (current_pos[axis] >= sizes[axis])
parent().index (axis) = parent().size (axis);
else
parent().index (axis) = indices[axis][current_pos[axis]];
}
private:
vector<ssize_t> current_pos;
vector<vector<uint32_t> > indices;
vector<ssize_t> sizes;
transform_type trans;
};
}
}
#endif
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