--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Applications/Samples/Sdl/SingleFrameViewer/SdlSimpleViewer.cpp	Tue Aug 11 13:24:38 2020 +0200
@@ -0,0 +1,276 @@
+/**
+ * Stone of Orthanc
+ * 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 Affero 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "SdlSimpleViewerApplication.h"
+#include "../SdlHelpers.h"
+#include "../../Common/SampleHelpers.h"
+
+#include "../../../Sources/Loaders/GenericLoadersContext.h"
+#include "../../../Sources/StoneException.h"
+#include "../../../Sources/StoneEnumerations.h"
+#include "../../../Sources/StoneInitialization.h"
+#include "../../../Sources/Viewport/SdlViewport.h"
+
+#include <Compatibility.h>  // For std::unique_ptr<>
+#include <OrthancException.h>
+
+#include <boost/program_options.hpp>
+#include <SDL.h>
+
+#include <string>
+
+
+std::string orthancUrl;
+std::string instanceId;
+int frameIndex = 0;
+
+
+static void ProcessOptions(int argc, char* argv[])
+{
+  namespace po = boost::program_options;
+  po::options_description desc("Usage");
+
+  desc.add_options()
+    ("loglevel", po::value<std::string>()->default_value("WARNING"),
+     "You can choose WARNING, INFO or TRACE for the logging level: Errors and warnings will always be displayed. (default: WARNING)")
+
+    ("orthanc", po::value<std::string>()->default_value("http://localhost:8042"),
+     "Base URL of the Orthanc instance")
+
+    ("instance", po::value<std::string>()->default_value("285dece8-e1956b38-cdc7d084-6ce3371e-536a9ffc"),
+     "Orthanc ID of the instance to display")
+
+    ("frame_index", po::value<int>()->default_value(0),
+     "The zero-based index of the frame (for multi-frame instances)")
+    ;
+
+  std::cout << desc << std::endl;
+
+  po::variables_map vm;
+  try
+  {
+    po::store(po::parse_command_line(argc, argv, desc), vm);
+    po::notify(vm);
+  }
+  catch (std::exception& e)
+  {
+    std::cerr << "Please check your command line options! (\"" << e.what() << "\")" << std::endl;
+  }
+
+  if (vm.count("loglevel") > 0)
+  {
+    std::string logLevel = vm["loglevel"].as<std::string>();
+    OrthancStoneHelpers::SetLogLevel(logLevel);
+  }
+
+  if (vm.count("orthanc") > 0)
+  {
+    // maybe check URL validity here
+    orthancUrl = vm["orthanc"].as<std::string>();
+  }
+
+  if (vm.count("instance") > 0)
+  {
+    instanceId = vm["instance"].as<std::string>();
+  }
+
+  if (vm.count("frame_index") > 0)
+  {
+    frameIndex = vm["frame_index"].as<int>();
+  }
+
+}
+
+/**
+ * IMPORTANT: The full arguments to "main()" are needed for SDL on
+ * Windows. Otherwise, one gets the linking error "undefined reference
+ * to `SDL_main'". https://wiki.libsdl.org/FAQWindows
+ **/
+int main(int argc, char* argv[])
+{
+  try
+  {
+    OrthancStone::StoneInitialize();
+
+    ProcessOptions(argc, argv);
+
+    //Orthanc::Logging::EnableInfoLevel(true);
+    //Orthanc::Logging::EnableTraceLevel(true);
+
+    {
+
+#if 1
+      boost::shared_ptr<OrthancStone::SdlViewport> viewport =
+        OrthancStone::SdlOpenGLViewport::Create("Stone of Orthanc", 800, 600);
+#else
+      boost::shared_ptr<OrthancStone::SdlViewport> viewport =
+        OrthancStone::SdlCairoViewport::Create("Stone of Orthanc", 800, 600);
+#endif
+
+      OrthancStone::GenericLoadersContext context(1, 4, 1);
+
+      Orthanc::WebServiceParameters orthancWebService;
+      orthancWebService.SetUrl(orthancUrl);
+      context.SetOrthancParameters(orthancWebService);
+
+      context.StartOracle();
+
+      {
+
+        boost::shared_ptr<SdlSimpleViewerApplication> application(
+          SdlSimpleViewerApplication::Create(context, viewport));
+
+        OrthancStone::DicomSource source;
+
+        application->LoadOrthancFrame(source, instanceId, frameIndex);
+
+        OrthancStone::DefaultViewportInteractor interactor;
+        interactor.SetWindowingLayer(0);
+
+        {
+          int scancodeCount = 0;
+          const uint8_t* keyboardState = SDL_GetKeyboardState(&scancodeCount);
+
+          bool stop = false;
+          while (!stop)
+          {
+            bool paint = false;
+            SDL_Event event;
+            while (SDL_PollEvent(&event))
+            {
+              if (event.type == SDL_QUIT)
+              {
+                stop = true;
+                break;
+              }
+              else if (viewport->IsRefreshEvent(event))
+              {
+                paint = true;
+              }
+              else if (event.type == SDL_WINDOWEVENT &&
+                       (event.window.event == SDL_WINDOWEVENT_RESIZED ||
+                        event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED))
+              {
+                viewport->UpdateSize(event.window.data1, event.window.data2);
+              }
+              else if (event.type == SDL_WINDOWEVENT &&
+                       (event.window.event == SDL_WINDOWEVENT_SHOWN ||
+                        event.window.event == SDL_WINDOWEVENT_EXPOSED))
+              {
+                paint = true;
+              }
+              else if (event.type == SDL_KEYDOWN &&
+                       event.key.repeat == 0 /* Ignore key bounce */)
+              {
+                switch (event.key.keysym.sym)
+                {
+                case SDLK_f:
+                  viewport->ToggleMaximize();
+                  break;
+
+                case SDLK_s:
+                  application->FitContent();
+                  break;
+
+                case SDLK_q:
+                  stop = true;
+                  break;
+
+                default:
+                  break;
+                }
+              }
+              else if (event.type == SDL_MOUSEBUTTONDOWN ||
+                       event.type == SDL_MOUSEMOTION ||
+                       event.type == SDL_MOUSEBUTTONUP)
+              {
+                std::unique_ptr<OrthancStone::IViewport::ILock> lock(viewport->Lock());
+                if (lock->HasCompositor())
+                {
+                  OrthancStone::PointerEvent p;
+                  OrthancStoneHelpers::GetPointerEvent(p, lock->GetCompositor(),
+                                                       event, keyboardState, scancodeCount);
+
+                  switch (event.type)
+                  {
+                  case SDL_MOUSEBUTTONDOWN:
+                    lock->GetController().HandleMousePress(interactor, p,
+                                                           lock->GetCompositor().GetCanvasWidth(),
+                                                           lock->GetCompositor().GetCanvasHeight());
+                    lock->Invalidate();
+                    break;
+
+                  case SDL_MOUSEMOTION:
+                    if (lock->GetController().HandleMouseMove(p))
+                    {
+                      lock->Invalidate();
+                    }
+                    break;
+
+                  case SDL_MOUSEBUTTONUP:
+                    lock->GetController().HandleMouseRelease(p);
+                    lock->Invalidate();
+                    break;
+
+                  default:
+                    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+                  }
+                }
+              }
+            }
+
+            if (paint)
+            {
+              viewport->Paint();
+            }
+
+            // Small delay to avoid using 100% of CPU
+            SDL_Delay(1);
+          }
+        }
+        context.StopOracle();
+      }
+    }
+
+    OrthancStone::StoneFinalize();
+    return 0;
+  }
+  catch (Orthanc::OrthancException& e)
+  {
+    LOG(ERROR) << "OrthancException: " << e.What();
+    return -1;
+  }
+  catch (OrthancStone::StoneException& e)
+  {
+    LOG(ERROR) << "StoneException: " << e.What();
+    return -1;
+  }
+  catch (std::runtime_error& e)
+  {
+    LOG(ERROR) << "Runtime error: " << e.what();
+    return -1;
+  }
+  catch (...)
+  {
+    LOG(ERROR) << "Native exception";
+    return -1;
+  }
+}