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/************************************************************************
*
* Copyright (C) 2018-2025 IRCAD France
* Copyright (C) 2018-2021 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 "filter/image/line_drawer.hpp"
#include <core/spy_log.hpp>
#include <data/helper/medical_image.hpp>
#include <utility>
namespace sight::filter::image
{
//-----------------------------------------------------------------------------
line_drawer::line_drawer(data::image::sptr _img, data::image::csptr _roi) :
m_image(std::move(_img)),
m_roi_image(std::move(_roi))
{
m_use_roi = data::helper::medical_image::check_image_validity(m_roi_image);
m_image_type_size = std::uint8_t(m_image->type().size());
m_roi_type_size = m_use_roi ? std::uint8_t(m_roi_image->type().size()) : 0;
const auto& size = m_image->size();
m_y_pitch = size[0];
m_z_pitch = size[1] * m_y_pitch;
}
//-----------------------------------------------------------------------------
bool line_drawer::draw_ellipse(
const line_drawer::coordinates_t& _c,
const data::image::buffer_t* _value,
const double _radius,
const std::size_t _first_dim,
const std::size_t _second_dim,
const bool _overwrite,
image_diff& _diff
)
{
bool modified = false;
const auto& spacing = m_image->spacing();
const auto& size = m_image->size();
const double width = _radius / spacing[_first_dim];
const double height = _radius / spacing[_second_dim];
int orig_x = static_cast<int>(_c[_first_dim]);
int orig_y = static_cast<int>(_c[_second_dim]);
line_drawer::coordinates_t point = _c;
int w_begin = std::max(static_cast<int>(-width), -orig_x);
int h_begin = std::max(static_cast<int>(-height), -orig_y);
int w_end = std::min(static_cast<int>(width), static_cast<int>(size[_first_dim]) - 1 - orig_x);
int h_end = std::min(static_cast<int>(height), static_cast<int>(size[_second_dim]) - 1 - orig_y);
for(int y = h_begin ; y <= h_end ; y++)
{
for(int x = w_begin ; x <= w_end ; x++)
{
double dx = x / width;
double dy = y / height;
if(dx * dx + dy * dy <= 1)
{
point[_first_dim] = static_cast<data::image::index_t>(orig_x) + static_cast<data::image::index_t>(x);
point[_second_dim] = static_cast<data::image::index_t>(orig_y) + static_cast<data::image::index_t>(y);
const data::image::index_t index = point[0] + point[1] * m_y_pitch + point[2] * m_z_pitch;
modified |= this->draw_pixel(index, _value, _overwrite, _diff);
}
}
}
return modified;
}
//-----------------------------------------------------------------------------
bool line_drawer::draw_pixel(
const data::image::index_t _index,
const data::image::buffer_t* _value,
const bool _overwrite,
image_diff& _diff
)
{
const data::image::buffer_t* pix_buf =
reinterpret_cast<data::image::buffer_t*>(m_image->get_pixel(_index));
if(m_use_roi)
{
const auto* roi_val =
reinterpret_cast<const data::image::buffer_t*>(m_roi_image->get_pixel(_index));
if(data::helper::medical_image::is_buf_null(roi_val, m_roi_type_size))
{
return false;
}
}
if(std::equal(pix_buf, pix_buf + m_image_type_size, _value))
{
return false;
}
if(!_overwrite && !data::helper::medical_image::is_buf_null(pix_buf, m_image_type_size))
{
return false;
}
_diff.add_diff(_index, pix_buf, _value);
m_image->set_pixel(_index, _value);
return true;
}
//-----------------------------------------------------------------------------
image_diff line_drawer::draw(
const bresenham_line::Orientation _orientation,
const coordinates_t& _start_coord,
const coordinates_t& _end_coord,
const data::image::buffer_t* _value,
const double _thickness,
const bool _overwrite
)
{
image_diff diff(m_image_type_size, 128);
std::size_t dim0 = 0;
std::size_t dim1 = 0;
switch(_orientation)
{
case bresenham_line::Orientation::z_axis:
dim0 = 0;
dim1 = 1;
break;
case bresenham_line::Orientation::y_axis:
dim0 = 2;
dim1 = 0;
break;
case bresenham_line::Orientation::x_axis:
dim0 = 1;
dim1 = 2;
break;
default:
SIGHT_ASSERT("Unknown axis", false);
dim0 = 0;
dim1 = 1;
}
bresenham_line::path_t path = bresenham_line::draw(_orientation, _start_coord, _end_coord);
auto pixel = path.begin();
auto end_pixel = path.end();
bool modified = false;
for( ; pixel != end_pixel ; ++pixel)
{
modified = this->draw_ellipse(*pixel, _value, _thickness / 2.0, dim0, dim1, _overwrite, diff) || modified;
}
return diff;
}
} // namespace sight::filter::image
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