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/************************************************************************
*
* Copyright (C) 2009-2023 IRCAD France
* Copyright (C) 2012-2016 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.hpp"
#include <core/spy_log.hpp>
namespace sight::data::dicom
{
image::image(
std::uint16_t _samples_per_pixel,
std::uint16_t _bits_allocated,
std::uint16_t _bits_stored,
std::uint16_t _high_bit,
std::uint16_t _pixel_representation,
double _rescale_slope,
double _rescale_intercept
) :
m_samples_per_pixel(_samples_per_pixel),
m_bits_allocated(_bits_allocated),
m_bits_stored(_bits_stored),
m_high_bit(_high_bit),
m_pixel_representation(_pixel_representation),
m_rescale_slope(_rescale_slope),
m_rescale_intercept(_rescale_intercept)
{
}
//-----------------------------------------------------------------------------
image::~image()
= default;
//-----------------------------------------------------------------------------
core::type image::find_image_type_from_min_max_values() const
{
core::type result = core::type::NONE;
// Bool & Monochrome values
if(m_bits_allocated == 1 && m_pixel_representation == 0)
{
result = core::type::INT8;
}
else
{
// Double
if(m_rescale_slope != (int) m_rescale_slope || m_rescale_intercept != (int) m_rescale_intercept)
{
result = core::type::DOUBLE;
}
else
{
const auto min =
static_cast<int64_t>(m_rescale_slope * static_cast<double>(this->get_pixel_min())
+ m_rescale_intercept);
const auto max =
static_cast<int64_t>(m_rescale_slope * static_cast<double>(this->get_pixel_max())
+ m_rescale_intercept);
SIGHT_ASSERT("Min must be lower than max.", min <= max);
// Unsigned values
if(min >= 0)
{
if(max <= std::numeric_limits<uint8_t>::max())
{
result = core::type::UINT8;
}
else if(max <= std::numeric_limits<uint16_t>::max())
{
result = core::type::UINT16;
}
else if(max <= std::numeric_limits<uint32_t>::max())
{
result = core::type::UINT32;
}
else
{
SIGHT_ASSERT("Unable to determine the pixel format.", 0);
}
}
// Signed values
else
{
if(max <= std::numeric_limits<int8_t>::max() && min >= std::numeric_limits<int8_t>::min())
{
result = core::type::INT8;
}
else if(max <= std::numeric_limits<int16_t>::max() && min >= std::numeric_limits<int16_t>::min())
{
result = core::type::INT16;
}
else if(max <= std::numeric_limits<int32_t>::max() && min >= std::numeric_limits<int32_t>::min())
{
result = core::type::INT32;
}
else
{
SIGHT_ASSERT("Unable to determine the pixel format.", 0);
}
}
}
}
return result;
}
//-----------------------------------------------------------------------------
int64_t image::get_pixel_min() const
{
SIGHT_ASSERT("The number of bits allocated must be known", m_bits_allocated);
SIGHT_ASSERT("The number of bits stored must be less than 33.", m_bits_stored <= 32);
if(m_pixel_representation == 1)
{
return (int64_t) (~(((1ULL << m_bits_stored) - 1) >> 1));
}
if(m_pixel_representation == 0)
{
return 0;
}
SIGHT_ASSERT("Unable to determine minimum value of pixel", 0);
return 0;
}
//-----------------------------------------------------------------------------
int64_t image::get_pixel_max() const
{
SIGHT_ASSERT("The number of bits allocated must be known", m_bits_allocated);
SIGHT_ASSERT("The number of bits stored must be less than 33.", m_bits_stored <= 32);
if(m_pixel_representation == 1)
{
return (int64_t) (((1ULL << m_bits_stored) - 1) >> 1);
}
if(m_pixel_representation == 0)
{
return (int64_t) ((1ULL << m_bits_stored) - 1);
}
SIGHT_ASSERT("Unable to determine maximum value of pixel", 0);
return 0;
}
} // namespace sight::data::dicom
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