--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Radiography/RadiographyAlphaLayer.h	Thu Nov 29 15:11:19 2018 +0100
@@ -0,0 +1,89 @@
+/**
+ * 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 "RadiographyLayer.h"
+
+namespace OrthancStone
+{
+  class RadiographyScene;
+
+  // creates a transparent layer whose alpha channel is provided as a UINT8 image to SetAlpha.
+  // The color of the "mask" is either defined by a ForegroundValue or by the center value of the
+  // windowing from the scene.
+  class RadiographyAlphaLayer : public RadiographyLayer
+  {
+  private:
+    const RadiographyScene&                scene_;
+    std::auto_ptr<Orthanc::ImageAccessor>  alpha_;      // Grayscale8
+    bool                                   useWindowing_;
+    float                                  foreground_;
+
+  public:
+    RadiographyAlphaLayer(const RadiographyScene& scene) :
+      scene_(scene),
+      useWindowing_(true),
+      foreground_(0)
+    {
+    }
+
+
+    void SetForegroundValue(float foreground)
+    {
+      useWindowing_ = false;
+      foreground_ = foreground;
+    }
+
+    float GetForegroundValue() const
+    {
+      return foreground_;
+    }
+
+    bool IsUsingWindowing() const
+    {
+      return useWindowing_;
+    }
+
+    void SetAlpha(Orthanc::ImageAccessor* image);
+
+    virtual bool GetDefaultWindowing(float& center,
+                                     float& width) const
+    {
+      return false;
+    }
+
+
+    virtual void Render(Orthanc::ImageAccessor& buffer,
+                        const AffineTransform2D& viewTransform,
+                        ImageInterpolation interpolation) const;
+
+    virtual bool GetRange(float& minValue,
+                          float& maxValue) const;
+
+    const Orthanc::ImageAccessor& GetAlpha() const
+    {
+      return *(alpha_.get());
+    }
+
+
+  };
+}