--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Applications/Samples/WebAssembly/SingleFrameViewer/SingleFrameViewer.cpp	Tue Aug 11 13:24:38 2020 +0200
@@ -0,0 +1,169 @@
+/**
+ * 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 "SingleFrameViewerApplication.h"
+
+#include "../../../Sources/Loaders/WebAssemblyLoadersContext.h"
+#include "../../../Sources/StoneException.h"
+#include "../../../Sources/StoneInitialization.h"
+
+#include <Compatibility.h>  // For std::unique_ptr<>
+#include <Toolbox.h>
+
+#include <emscripten.h>
+#include <emscripten/html5.h>
+
+
+#define DISPATCH_JAVASCRIPT_EVENT(name)                         \
+  EM_ASM(                                                       \
+    const customEvent = document.createEvent("CustomEvent");    \
+    customEvent.initCustomEvent(name, false, false, undefined); \
+    window.dispatchEvent(customEvent);                          \
+    );
+
+#define EXTERN_CATCH_EXCEPTIONS                         \
+  catch (Orthanc::OrthancException& e)                  \
+  {                                                     \
+    LOG(ERROR) << "OrthancException: " << e.What();     \
+    DISPATCH_JAVASCRIPT_EVENT("StoneException");        \
+  }                                                     \
+  catch (OrthancStone::StoneException& e)               \
+  {                                                     \
+    LOG(ERROR) << "StoneException: " << e.What();       \
+    DISPATCH_JAVASCRIPT_EVENT("StoneException");        \
+  }                                                     \
+  catch (std::exception& e)                             \
+  {                                                     \
+    LOG(ERROR) << "Runtime error: " << e.what();        \
+    DISPATCH_JAVASCRIPT_EVENT("StoneException");        \
+  }                                                     \
+  catch (...)                                           \
+  {                                                     \
+    LOG(ERROR) << "Native exception";                   \
+    DISPATCH_JAVASCRIPT_EVENT("StoneException");        \
+  }
+
+
+
+namespace OrthancStone
+{
+}
+
+static std::unique_ptr<OrthancStone::WebAssemblyLoadersContext>  context_;
+static boost::shared_ptr<OrthancStone::Application>  application_;
+
+extern "C"
+{
+  int main(int argc, char const *argv[]) 
+  {
+    try
+    {
+      Orthanc::Logging::Initialize();
+      Orthanc::Logging::EnableInfoLevel(true);
+      //Orthanc::Logging::EnableTraceLevel(true);
+      LOG(WARNING) << "Initializing native Stone";
+
+      LOG(WARNING) << "Compiled with Emscripten " << __EMSCRIPTEN_major__
+                   << "." << __EMSCRIPTEN_minor__
+                   << "." << __EMSCRIPTEN_tiny__;
+
+      LOG(INFO) << "Endianness: " << Orthanc::EnumerationToString(Orthanc::Toolbox::DetectEndianness());
+      context_.reset(new OrthancStone::WebAssemblyLoadersContext(1, 4, 1));
+      context_->SetLocalOrthanc("..");
+      context_->SetDicomCacheSize(128 * 1024 * 1024);  // 128MB
+  
+      DISPATCH_JAVASCRIPT_EVENT("WasmModuleInitialized");
+    }
+    EXTERN_CATCH_EXCEPTIONS;
+
+    return 0;
+  }
+  
+  EMSCRIPTEN_KEEPALIVE
+  void InitializeViewport(const char* canvasId)
+  {
+    try
+    {
+      if (context_.get() == NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls,
+                                        "The loaders context is not available yet");
+      }
+      
+      if (application_.get() != NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls,
+                                        "Only one single viewport is available for this application");
+      }
+
+      boost::shared_ptr<OrthancStone::WebGLViewport> viewport(OrthancStone::GetWebGLViewportsRegistry().Add(canvasId));
+      application_ = OrthancStone::Application::Create(*context_, viewport);
+
+      {
+        OrthancStone::WebGLViewportsRegistry::Accessor accessor(
+          OrthancStone::GetWebGLViewportsRegistry(), canvasId);
+
+        if (accessor.IsValid())
+        {
+          accessor.GetViewport().Invalidate();
+        }
+      }
+    }
+    EXTERN_CATCH_EXCEPTIONS;
+  }
+
+  
+  EMSCRIPTEN_KEEPALIVE
+  void LoadFromOrthanc(const char* instance,
+                       int frame)
+  {
+    try
+    {
+      if (application_.get() != NULL)
+      {
+        OrthancStone::DicomSource source;
+        application_->LoadOrthancFrame(source, instance, frame);
+      }
+    }
+    EXTERN_CATCH_EXCEPTIONS;
+  }
+
+  
+  EMSCRIPTEN_KEEPALIVE
+  void LoadFromDicomWeb(const char* server,
+                        const char* studyInstanceUid,
+                        const char* seriesInstanceUid,
+                        const char* sopInstanceUid,
+                        int frame)
+  {
+    try
+    {
+      if (application_.get() != NULL)
+      {
+        OrthancStone::DicomSource source;
+        source.SetDicomWebThroughOrthancSource(server);
+        application_->LoadDicomWebFrame(source, studyInstanceUid, seriesInstanceUid,
+                                        sopInstanceUid, frame);
+      }
+    }
+    EXTERN_CATCH_EXCEPTIONS;
+  }
+}