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/************************************************************************
*
* Copyright (C) 2017-2024 IRCAD France
* Copyright (C) 2017-2020 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "image_diff.hpp"
namespace sight::filter::image
{
//-----------------------------------------------------------------------------
image_diff::image_diff(const std::size_t _image_element_size, const std::size_t _reserved_elements) :
m_img_elt_size(_image_element_size),
m_elt_size(_image_element_size * 2 + sizeof(data::image::index_t))
{
m_buffer.reserve(_reserved_elements);
}
//------------------------------------------------------------------------------
void image_diff::add_diff(const image_diff& _diff)
{
SIGHT_ASSERT("Diff elements must be the same size.", m_elt_size == _diff.m_elt_size);
const std::size_t old_size = this->size();
const std::size_t new_size = old_size + _diff.size();
m_buffer.reserve(new_size);
std::copy(_diff.m_buffer.begin(), _diff.m_buffer.end(), std::back_inserter(m_buffer));
}
//-----------------------------------------------------------------------------
void image_diff::add_diff(
data::image::index_t _index,
const data::image::buffer_t* _old_value,
const data::image::buffer_t* _new_value
)
{
const std::size_t old_size = m_buffer.size();
// Double the size of the buffer to prevent systematic reallocation when building a diff
if(old_size + m_elt_size > m_buffer.capacity())
{
const std::size_t new_size = std::max(m_elt_size, old_size) * 2;
m_buffer.reserve(new_size);
}
std::copy_n(reinterpret_cast<std::uint8_t*>(&_index), sizeof(data::image::index_t), std::back_inserter(m_buffer));
std::copy_n(_old_value, m_img_elt_size, std::back_inserter(m_buffer));
std::copy_n(_new_value, m_img_elt_size, std::back_inserter(m_buffer));
}
//------------------------------------------------------------------------------
void image_diff::apply_diff(const data::image::sptr& _img) const
{
const auto dump_lock = _img->dump_lock();
for(std::size_t i = 0 ; i < num_elements() ; ++i)
{
apply_diff_elt(_img, i);
}
}
//------------------------------------------------------------------------------
void image_diff::revert_diff(const data::image::sptr& _img) const
{
const auto dump_lock = _img->dump_lock();
for(std::size_t i = 0 ; i < num_elements() ; ++i)
{
revert_diff_elt(_img, i);
}
}
//------------------------------------------------------------------------------
std::size_t image_diff::size() const
{
return m_buffer.size();
}
//------------------------------------------------------------------------------
std::size_t image_diff::num_elements() const
{
return size() / m_elt_size;
}
//------------------------------------------------------------------------------
void image_diff::clear()
{
m_buffer.clear();
}
//------------------------------------------------------------------------------
void image_diff::shrink()
{
m_buffer.shrink_to_fit();
}
//------------------------------------------------------------------------------
image_diff::element_t image_diff::get_element(std::size_t _index) const
{
element_t elt {};
elt.m_index = *reinterpret_cast<const data::image::index_t*>(&m_buffer[_index * m_elt_size]);
elt.m_old_value = &m_buffer[_index * m_elt_size + sizeof(data::image::index_t)];
elt.m_new_value = &m_buffer[_index * m_elt_size + sizeof(data::image::index_t) + m_img_elt_size];
return elt;
}
//------------------------------------------------------------------------------
void image_diff::apply_diff_elt(const data::image::sptr& _img, std::size_t _elt_index) const
{
element_t elt = get_element(_elt_index);
_img->set_pixel(elt.m_index, elt.m_new_value);
}
//------------------------------------------------------------------------------
void image_diff::revert_diff_elt(const data::image::sptr& _img, std::size_t _elt_index) const
{
element_t elt = get_element(_elt_index);
_img->set_pixel(elt.m_index, elt.m_old_value);
}
} // namespace sight::filter::image
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