--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/IVolumeSlicer.h	Sat Nov 10 09:29:08 2018 +0100
@@ -0,0 +1,133 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 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/>.
+ **/
+
+
+#pragma once
+
+#include "ILayerRenderer.h"
+#include "../Toolbox/Slice.h"
+#include "../../Framework/Messages/IObservable.h"
+#include "../../Framework/Messages/IMessage.h"
+#include "Core/Images/Image.h"
+#include <boost/shared_ptr.hpp>
+
+namespace OrthancStone
+{
+  class IVolumeSlicer : public IObservable
+  {
+  public:
+    typedef OriginMessage<MessageType_LayerSource_GeometryReady, IVolumeSlicer>  GeometryReadyMessage;
+    typedef OriginMessage<MessageType_LayerSource_GeometryError, IVolumeSlicer>  GeometryErrorMessage;
+    typedef OriginMessage<MessageType_LayerSource_ContentChanged, IVolumeSlicer> ContentChangedMessage;
+
+    class SliceChangedMessage : public OriginMessage<MessageType_LayerSource_SliceChanged, IVolumeSlicer>
+    {
+    private:
+      const Slice& slice_;
+
+    public:
+      SliceChangedMessage(IVolumeSlicer& origin,
+                          const Slice& slice) :
+        OriginMessage(origin),
+        slice_(slice)
+      {
+      }
+
+      const Slice& GetSlice() const
+      {
+        return slice_;
+      }
+    };
+    
+
+    class LayerReadyMessage : public OriginMessage<MessageType_LayerSource_LayerReady, IVolumeSlicer>
+    {
+    public:
+      class IRendererFactory : public boost::noncopyable
+      {
+      public:
+        virtual ~IRendererFactory()
+        {
+        }
+
+        virtual ILayerRenderer* CreateRenderer() const = 0;
+      };
+    
+    private:
+      const IRendererFactory&    factory_;
+      const CoordinateSystem3D&  slice_;
+
+    public:
+      LayerReadyMessage(IVolumeSlicer& origin,
+                        const IRendererFactory& rendererFactory,
+                        const CoordinateSystem3D& slice) :
+        OriginMessage(origin),
+        factory_(rendererFactory),
+        slice_(slice)
+      {
+      }
+
+      ILayerRenderer* CreateRenderer() const
+      {
+        return factory_.CreateRenderer();
+      }
+
+      const CoordinateSystem3D& GetSlice() const
+      {
+        return slice_;
+      }
+    };
+
+
+    class LayerErrorMessage : public OriginMessage<MessageType_LayerSource_LayerError, IVolumeSlicer>
+    {
+    private:
+      const CoordinateSystem3D&  slice_;
+
+    public:
+      LayerErrorMessage(IVolumeSlicer& origin,
+                        const CoordinateSystem3D& slice) :
+        OriginMessage(origin),
+        slice_(slice)
+      {
+      }
+
+      const CoordinateSystem3D& GetSlice() const
+      {
+        return slice_;
+      }
+    };
+
+
+    IVolumeSlicer(MessageBroker& broker) :
+      IObservable(broker)
+    {
+    }
+    
+    virtual ~IVolumeSlicer()
+    {
+    }
+
+    virtual bool GetExtent(std::vector<Vector>& points,
+                           const CoordinateSystem3D& viewportSlice) = 0;
+
+    virtual void ScheduleLayerCreation(const CoordinateSystem3D& viewportSlice) = 0;
+  };
+}