--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/Internals/CairoBaseRenderer.h	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,65 @@
+/**
+ * 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/>.
+ **/
+
+
+#pragma once
+
+#include "ICairoContextProvider.h"
+#include "CompositorHelper.h"
+
+#include <Compatibility.h>
+
+namespace OrthancStone
+{
+  namespace Internals
+  {
+    class CairoBaseRenderer : public CompositorHelper::ILayerRenderer
+    {
+    private:
+      ICairoContextProvider&      target_;
+      std::unique_ptr<ISceneLayer>  layer_;
+
+    protected:
+      template<typename T>
+      const T& GetLayer() const
+      {
+        return dynamic_cast<T&>(*layer_);
+      }
+
+      cairo_t* GetCairoContext() const
+      {
+        return target_.GetCairoContext();
+      }
+    
+    public:
+      CairoBaseRenderer(ICairoContextProvider& target,
+                        const ISceneLayer& layer) :
+        target_(target)
+      {
+        Update(layer);
+      }
+
+      virtual void Update(const ISceneLayer& layer)
+      {
+        layer_.reset(layer.Clone());
+      }
+    };
+  }
+}