--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/ILayerSource.h	Tue May 16 22:12:41 2017 +0200
@@ -0,0 +1,71 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017 Osimis, 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/SliceGeometry.h"
+
+namespace OrthancStone
+{
+  class ILayerSource : public boost::noncopyable
+  {
+  public:
+    class IObserver : public boost::noncopyable
+    {
+    public:
+      virtual ~IObserver()
+      {
+      }
+
+      // Triggered if the extent or the content of the volume has changed
+      virtual void NotifySourceChange(ILayerSource& source) = 0;
+
+      // Triggered if some slice in the source volume has changed
+      virtual void NotifySliceChange(ILayerSource& source,
+                                     const SliceGeometry& slice) = 0;
+
+      // The layer must be deleted by the observer. "layer" will never
+      // be "NULL", otherwise "NotifyLayerError()" would have been
+      // called.
+      virtual void NotifyLayerReady(ILayerRenderer *layer,
+                                    ILayerSource& source,
+                                    const SliceGeometry& viewportSlice) = 0;
+
+      virtual void NotifyLayerError(ILayerSource& source,
+                                    const SliceGeometry& viewportSlice) = 0;
+    };
+    
+    virtual ~ILayerSource()
+    {
+    }
+
+    virtual void SetObserver(IObserver& observer) = 0;
+
+    virtual bool GetExtent(double& x1,
+                           double& y1,
+                           double& x2,
+                           double& y2,
+                           const SliceGeometry& viewportSlice) = 0;
+
+    virtual void ScheduleLayerCreation(const SliceGeometry& viewportSlice) = 0;
+  };
+}