Mercurial > hg > orthanc
diff OrthancFramework/Sources/Images/PamWriter.cpp @ 4044:d25f4c0fa160 framework
splitting code into OrthancFramework and OrthancServer
author | Sebastien Jodogne <s.jodogne@gmail.com> |
---|---|
date | Wed, 10 Jun 2020 20:30:34 +0200 |
parents | Core/Images/PamWriter.cpp@94f4a18a79cc |
children | bf7b9edf6b81 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OrthancFramework/Sources/Images/PamWriter.cpp Wed Jun 10 20:30:34 2020 +0200 @@ -0,0 +1,160 @@ +/** + * Orthanc - A Lightweight, RESTful DICOM Store + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2020 Osimis S.A., 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" +#include "PamWriter.h" + +#include "../Endianness.h" +#include "../OrthancException.h" +#include "../Toolbox.h" + +#include <boost/lexical_cast.hpp> + + +namespace Orthanc +{ + static void GetPixelFormatInfo(const PixelFormat& format, + unsigned int& maxValue, + unsigned int& channelCount, + unsigned int& bytesPerChannel, + std::string& tupleType) + { + switch (format) + { + case PixelFormat_Grayscale8: + maxValue = 255; + channelCount = 1; + bytesPerChannel = 1; + tupleType = "GRAYSCALE"; + break; + + case PixelFormat_SignedGrayscale16: + case PixelFormat_Grayscale16: + maxValue = 65535; + channelCount = 1; + bytesPerChannel = 2; + tupleType = "GRAYSCALE"; + break; + + case PixelFormat_RGB24: + maxValue = 255; + channelCount = 3; + bytesPerChannel = 1; + tupleType = "RGB"; + break; + + case PixelFormat_RGB48: + maxValue = 255; + channelCount = 3; + bytesPerChannel = 2; + tupleType = "RGB"; + break; + + default: + throw OrthancException(ErrorCode_NotImplemented); + } + } + + + void PamWriter::WriteToMemoryInternal(std::string& target, + unsigned int width, + unsigned int height, + unsigned int sourcePitch, + PixelFormat format, + const void* buffer) + { + unsigned int maxValue, channelCount, bytesPerChannel; + std::string tupleType; + GetPixelFormatInfo(format, maxValue, channelCount, bytesPerChannel, tupleType); + + target = (std::string("P7") + + std::string("\nWIDTH ") + boost::lexical_cast<std::string>(width) + + std::string("\nHEIGHT ") + boost::lexical_cast<std::string>(height) + + std::string("\nDEPTH ") + boost::lexical_cast<std::string>(channelCount) + + std::string("\nMAXVAL ") + boost::lexical_cast<std::string>(maxValue) + + std::string("\nTUPLTYPE ") + tupleType + + std::string("\nENDHDR\n")); + + if (bytesPerChannel != 1 && + bytesPerChannel != 2) + { + throw OrthancException(ErrorCode_NotImplemented); + } + + size_t targetPitch = channelCount * bytesPerChannel * width; + size_t offset = target.size(); + + target.resize(offset + targetPitch * height); + + assert(target.size() != 0); + + if (Toolbox::DetectEndianness() == Endianness_Little && + bytesPerChannel == 2) + { + // Byte swapping + for (unsigned int h = 0; h < height; ++h) + { + const uint16_t* p = reinterpret_cast<const uint16_t*> + (reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch); + uint16_t* q = reinterpret_cast<uint16_t*> + (reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch); + + for (unsigned int w = 0; w < width * channelCount; ++w) + { + // memcpy() is necessary to avoid segmentation fault if the + // "pixel" pointer is not 16-bit aligned (which is the case + // if "offset" is an odd number). Check out issue #99: + // https://bitbucket.org/sjodogne/orthanc/issues/99 + uint16_t v = htobe16(*p); + memcpy(q, &v, sizeof(uint16_t)); + + p++; + q++; + } + } + } + else + { + // Either "bytesPerChannel == 1" (and endianness is not + // relevant), or we run on a big endian architecture (and no + // byte swapping is necessary, as PAM uses big endian) + + for (unsigned int h = 0; h < height; ++h) + { + const void* p = reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch; + void* q = reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch; + memcpy(q, p, targetPitch); + } + } + } +}