--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Oracle/GetOrthancWebViewerJpegCommand.cpp	Wed May 22 12:48:57 2019 +0200
@@ -0,0 +1,217 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 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 "GetOrthancWebViewerJpegCommand.h"
+
+#include "../Toolbox/LinearAlgebra.h"
+
+#include <Core/Images/Image.h>
+#include <Core/Images/ImageProcessing.h>
+#include <Core/Images/JpegReader.h>
+#include <Core/OrthancException.h>
+#include <Core/Toolbox.h>
+
+#include <json/reader.h>
+#include <json/value.h>
+
+namespace OrthancStone
+{
+  GetOrthancWebViewerJpegCommand::SuccessMessage::SuccessMessage(const GetOrthancWebViewerJpegCommand& command,
+                                                                 Orthanc::ImageAccessor* image) :   // Takes ownership
+    OriginMessage(command),
+    image_(image)
+  {
+    if (image == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+  }
+
+
+  GetOrthancWebViewerJpegCommand::GetOrthancWebViewerJpegCommand() :
+    frame_(0),
+    quality_(95),
+    timeout_(10),
+    expectedFormat_(Orthanc::PixelFormat_Grayscale8)
+  {
+  }
+
+
+  void GetOrthancWebViewerJpegCommand::SetQuality(unsigned int quality)
+  {
+    if (quality <= 0 ||
+        quality > 100)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+    else
+    {
+      quality_ = quality;
+    }
+  }
+
+
+  std::string GetOrthancWebViewerJpegCommand::GetUri() const
+  {
+    return ("/web-viewer/instances/jpeg" + boost::lexical_cast<std::string>(quality_) +
+            "-" + instanceId_ + "_" + boost::lexical_cast<std::string>(frame_));
+  }
+
+
+  void GetOrthancWebViewerJpegCommand::ProcessHttpAnswer(IMessageEmitter& emitter,
+                                                         const IObserver& receiver,
+                                                         const std::string& answer) const
+  {
+    // This code comes from older "OrthancSlicesLoader::ParseSliceImageJpeg()"
+      
+    Json::Value encoded;
+
+    {
+      Json::Reader reader;
+      if (!reader.parse(answer, encoded))
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+      }
+    }
+
+    if (encoded.type() != Json::objectValue ||
+        !encoded.isMember("Orthanc") ||
+        encoded["Orthanc"].type() != Json::objectValue)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+    }
+    
+    const Json::Value& info = encoded["Orthanc"];
+    if (!info.isMember("PixelData") ||
+        !info.isMember("Stretched") ||
+        !info.isMember("Compression") ||
+        info["Compression"].type() != Json::stringValue ||
+        info["PixelData"].type() != Json::stringValue ||
+        info["Stretched"].type() != Json::booleanValue ||
+        info["Compression"].asString() != "Jpeg")
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+    }
+    
+    bool isSigned = false;
+    bool isStretched = info["Stretched"].asBool();
+    
+    if (info.isMember("IsSigned"))
+    {
+      if (info["IsSigned"].type() != Json::booleanValue)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+      }
+      else
+      {
+        isSigned = info["IsSigned"].asBool();
+      }
+    }
+    
+    std::auto_ptr<Orthanc::ImageAccessor> reader;
+    
+    {
+      std::string jpeg;
+      Orthanc::Toolbox::DecodeBase64(jpeg, info["PixelData"].asString());
+      
+      reader.reset(new Orthanc::JpegReader);
+      dynamic_cast<Orthanc::JpegReader&>(*reader).ReadFromMemory(jpeg);
+    }
+    
+    if (reader->GetFormat() == Orthanc::PixelFormat_RGB24)  // This is a color image
+    {
+      if (expectedFormat_ != Orthanc::PixelFormat_RGB24)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+      }
+      
+      if (isSigned || isStretched)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+      }
+      else
+      {
+        SuccessMessage message(*this, reader.release());
+        emitter.EmitMessage(receiver, message);
+        return;
+      }
+    }
+    
+    if (reader->GetFormat() != Orthanc::PixelFormat_Grayscale8)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+    }
+    
+    if (!isStretched)
+    {
+      if (expectedFormat_ != reader->GetFormat())
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+      }
+      else
+      {
+        SuccessMessage message(*this, reader.release());
+        emitter.EmitMessage(receiver, message);
+        return;
+      }
+    }
+    
+    int32_t stretchLow = 0;
+    int32_t stretchHigh = 0;
+    
+    if (!info.isMember("StretchLow") ||
+        !info.isMember("StretchHigh") ||
+        info["StretchLow"].type() != Json::intValue ||
+        info["StretchHigh"].type() != Json::intValue)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+    }
+    
+    stretchLow = info["StretchLow"].asInt();
+    stretchHigh = info["StretchHigh"].asInt();
+    
+    if (stretchLow < -32768 ||
+        stretchHigh > 65535 ||
+        (stretchLow < 0 && stretchHigh > 32767))
+    {
+      // This range cannot be represented with a uint16_t or an int16_t
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
+    }
+    
+    // Decode a grayscale JPEG 8bpp image coming from the Web viewer
+    std::auto_ptr<Orthanc::ImageAccessor> image
+      (new Orthanc::Image(expectedFormat_, reader->GetWidth(), reader->GetHeight(), false));
+
+    Orthanc::ImageProcessing::Convert(*image, *reader);
+    reader.reset();
+    
+    float scaling = static_cast<float>(stretchHigh - stretchLow) / 255.0f;
+    
+    if (!LinearAlgebra::IsCloseToZero(scaling))
+    {
+      float offset = static_cast<float>(stretchLow) / scaling;
+      Orthanc::ImageProcessing::ShiftScale(*image, offset, scaling, true);
+    }
+    
+    SuccessMessage message(*this, image.release());
+    emitter.EmitMessage(receiver, message);
+  }
+}