Mercurial > hg > orthanc-webviewer
view Orthanc/Plugins/Samples/GdcmDecoder/GdcmDecoderCache.cpp @ 132:2fffa4d0f313
merge
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 31 May 2016 12:12:59 +0200 |
parents | 3809121c3290 |
children | 5dc54316d68b |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital 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. * * 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 "GdcmDecoderCache.h" #include "OrthancImageWrapper.h" namespace OrthancPlugins { std::string GdcmDecoderCache::ComputeMd5(OrthancPluginContext* context, const void* dicom, size_t size) { std::string result; char* md5 = OrthancPluginComputeMd5(context, dicom, size); if (md5 == NULL) { throw std::runtime_error("Cannot compute MD5 hash"); } bool ok = false; try { result.assign(md5); ok = true; } catch (...) { } OrthancPluginFreeString(context, md5); if (!ok) { throw std::runtime_error("Not enough memory"); } else { return result; } } OrthancImageWrapper* GdcmDecoderCache::Decode(OrthancPluginContext* context, const void* dicom, const uint32_t size, uint32_t frameIndex) { std::string md5 = ComputeMd5(context, dicom, size); // First check whether the previously decoded image is the same // as this one { boost::mutex::scoped_lock lock(mutex_); if (decoder_.get() != NULL && size_ == size && md5_ == md5) { // This is the same image: Reuse the previous decoding return new OrthancImageWrapper(context, decoder_->Decode(context, frameIndex)); } } // This is not the same image std::auto_ptr<GdcmImageDecoder> decoder(new GdcmImageDecoder(dicom, size)); std::auto_ptr<OrthancImageWrapper> image(new OrthancImageWrapper(context, decoder->Decode(context, frameIndex))); { // Cache the newly created decoder for further use boost::mutex::scoped_lock lock(mutex_); decoder_ = decoder; size_ = size; md5_ = md5; } return image.release(); } }