--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/ILayerRendererFactory.h	Fri Oct 14 15:34:11 2016 +0200
@@ -0,0 +1,63 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "ILayerRenderer.h"
+#include "../Toolbox/SliceGeometry.h"
+#include "../Volumes/ISliceableVolume.h"
+
+namespace OrthancStone
+{
+  class ILayerRendererFactory : public IThreadUnsafe
+  {
+  public:
+    virtual ~ILayerRendererFactory()
+    {
+    }
+
+    virtual bool GetExtent(double& x1,
+                           double& y1,
+                           double& x2,
+                           double& y2,
+                           const SliceGeometry& displaySlice) = 0;
+
+    // This operation can be slow, as it might imply the download of a
+    // slice from Orthanc. The result might be NULL, if the slice is
+    // not compatible with the underlying source volume.
+    virtual ILayerRenderer* CreateLayerRenderer(const SliceGeometry& displaySlice) = 0;
+
+    virtual bool HasSourceVolume() const = 0;
+
+    virtual ISliceableVolume& GetSourceVolume() const = 0;
+  };
+}