--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/MissingLayerRenderer.h	Fri May 26 16:11:52 2017 +0200
@@ -0,0 +1,91 @@
+/**
+ * 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"
+
+namespace OrthancStone
+{
+  class MissingLayerRenderer : public ILayerRenderer
+  {
+  private:
+    double       x1_;
+    double       y1_;
+    double       x2_;
+    double       y2_;
+    RenderStyle  style_;
+
+  public:
+    MissingLayerRenderer(double x1,
+                         double y1,
+                         double x2,
+                         double y2) : 
+      x1_(x1),
+      y1_(y1),
+      x2_(x2),
+      y2_(y2)
+    {
+      if (x1_ > x2_)
+      {
+        std::swap(x1_, x2_);
+      }
+
+      if (y1_ > y2_)
+      {
+        std::swap(y1_, y2_);
+      }
+    }
+
+    virtual bool RenderLayer(CairoContext& context,
+                             const ViewportGeometry& view,
+                             const SliceGeometry& viewportSlice)
+    {
+      if (style_.visible_)
+      {
+        view.ApplyTransform(context);
+        context.SetSourceColor(style_.drawColor_);
+
+        cairo_t *cr = context.GetObject();
+        cairo_set_line_width(cr, 1.0 / view.GetZoom());
+        cairo_rectangle(cr, x1_, y1_, x2_ - x1_, y2_ - y1_);
+
+        double handleSize = 10.0f / view.GetZoom();
+        cairo_move_to(cr, x1_ + handleSize, y1_);
+        cairo_line_to(cr, x1_, y1_ + handleSize);
+
+        cairo_stroke(cr);
+      }
+
+      return true;
+    }
+
+    virtual void SetLayerStyle(const RenderStyle& style)
+    {
+      style_ = style;
+    }
+
+    virtual bool IsFullQuality()
+    {
+      return true;
+    }
+  };
+}