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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
* Belgium
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* In addition, as a special exception, the copyright holders of this
* program give permission to link the code of its release with the
* OpenSSL project's "OpenSSL" library (or with modified versions of it
* that use the same license as the "OpenSSL" library), and distribute
* the linked executables. You must obey the GNU General Public License
* in all respects for all of the code used other than "OpenSSL". If you
* modify file(s) with this exception, you may extend this exception to
* your version of the file(s), but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source files
* in the program, then also delete it here.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
#include "../PrecompiledHeaders.h"
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include "DicomIntegerPixelAccessor.h"
#include "../OrthancException.h"
#include <boost/lexical_cast.hpp>
#include <limits>
#include <cassert>
#include <stdio.h>
namespace Orthanc
{
DicomIntegerPixelAccessor::DicomIntegerPixelAccessor(const DicomMap& values,
const void* pixelData,
size_t size) :
information_(values),
pixelData_(pixelData),
size_(size)
{
frame_ = 0;
frameOffset_ = (information_.GetHeight() * information_.GetWidth() *
information_.GetBytesPerValue() * information_.GetChannelCount());
if (information_.GetNumberOfFrames() * frameOffset_ > size)
{
throw OrthancException(ErrorCode_BadFileFormat);
}
if (information_.IsSigned())
{
// Pixels are signed
mask_ = (1 << (information_.GetBitsStored() - 1)) - 1;
signMask_ = (1 << (information_.GetBitsStored() - 1));
}
else
{
// Pixels are unsigned
mask_ = (1 << information_.GetBitsStored()) - 1;
signMask_ = 0;
}
if (information_.IsPlanar())
{
/**
* Each color plane shall be sent contiguously. For RGB images,
* this means the order of the pixel values sent is R1, R2, R3,
* ..., G1, G2, G3, ..., B1, B2, B3, etc.
**/
rowOffset_ = information_.GetWidth() * information_.GetBytesPerValue();
}
else
{
/**
* The sample values for the first pixel are followed by the
* sample values for the second pixel, etc. For RGB images, this
* means the order of the pixel values sent shall be R1, G1, B1,
* R2, G2, B2, ..., etc.
**/
rowOffset_ = information_.GetWidth() * information_.GetBytesPerValue() * information_.GetChannelCount();
}
}
void DicomIntegerPixelAccessor::GetExtremeValues(int32_t& min,
int32_t& max) const
{
if (information_.GetHeight() == 0 || information_.GetWidth() == 0)
{
min = max = 0;
return;
}
min = std::numeric_limits<int32_t>::max();
max = std::numeric_limits<int32_t>::min();
for (unsigned int y = 0; y < information_.GetHeight(); y++)
{
for (unsigned int x = 0; x < information_.GetWidth(); x++)
{
for (unsigned int c = 0; c < information_.GetChannelCount(); c++)
{
int32_t v = GetValue(x, y);
if (v < min)
min = v;
if (v > max)
max = v;
}
}
}
}
int32_t DicomIntegerPixelAccessor::GetValue(unsigned int x,
unsigned int y,
unsigned int channel) const
{
assert(x < information_.GetWidth() &&
y < information_.GetHeight() &&
channel < information_.GetChannelCount());
const uint8_t* pixel = reinterpret_cast<const uint8_t*>(pixelData_) +
y * rowOffset_ + frame_ * frameOffset_;
// https://www.dabsoft.ch/dicom/3/C.7.6.3.1.3/
if (information_.IsPlanar())
{
/**
* Each color plane shall be sent contiguously. For RGB images,
* this means the order of the pixel values sent is R1, R2, R3,
* ..., G1, G2, G3, ..., B1, B2, B3, etc.
**/
assert(frameOffset_ % information_.GetChannelCount() == 0);
pixel += channel * frameOffset_ / information_.GetChannelCount() + x * information_.GetBytesPerValue();
}
else
{
/**
* The sample values for the first pixel are followed by the
* sample values for the second pixel, etc. For RGB images, this
* means the order of the pixel values sent shall be R1, G1, B1,
* R2, G2, B2, ..., etc.
**/
pixel += channel * information_.GetBytesPerValue() + x * information_.GetChannelCount() * information_.GetBytesPerValue();
}
uint32_t v;
v = pixel[0];
if (information_.GetBytesPerValue() >= 2)
v = v + (static_cast<uint32_t>(pixel[1]) << 8);
if (information_.GetBytesPerValue() >= 3)
v = v + (static_cast<uint32_t>(pixel[2]) << 16);
if (information_.GetBytesPerValue() >= 4)
v = v + (static_cast<uint32_t>(pixel[3]) << 24);
v = v >> information_.GetShift();
if (v & signMask_)
{
// Signed value
// http://en.wikipedia.org/wiki/Two%27s_complement#Subtraction_from_2N
return -static_cast<int32_t>(mask_) + static_cast<int32_t>(v & mask_) - 1;
}
else
{
// Unsigned value
return static_cast<int32_t>(v & mask_);
}
}
void DicomIntegerPixelAccessor::SetCurrentFrame(unsigned int frame)
{
if (frame >= information_.GetNumberOfFrames())
{
throw OrthancException(ErrorCode_ParameterOutOfRange);
}
frame_ = frame;
}
}
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