--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Radiography/RadiographyAlphaLayer.cpp	Thu Nov 29 15:11:19 2018 +0100
@@ -0,0 +1,132 @@
+/**
+ * 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/>.
+ **/
+
+
+#include "RadiographyAlphaLayer.h"
+
+#include "RadiographyScene.h"
+
+#include <Core/Images/Image.h>
+#include <Core/OrthancException.h>
+
+namespace OrthancStone
+{
+
+  void RadiographyAlphaLayer::SetAlpha(Orthanc::ImageAccessor* image)
+  {
+    std::auto_ptr<Orthanc::ImageAccessor> raii(image);
+
+    if (image == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+
+    if (image->GetFormat() != Orthanc::PixelFormat_Grayscale8)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
+    }
+
+    SetSize(image->GetWidth(), image->GetHeight());
+    alpha_ = raii;
+  }
+
+  void RadiographyAlphaLayer::Render(Orthanc::ImageAccessor& buffer,
+                                     const AffineTransform2D& viewTransform,
+                                     ImageInterpolation interpolation) const
+  {
+    if (alpha_.get() == NULL)
+    {
+      return;
+    }
+
+    if (buffer.GetFormat() != Orthanc::PixelFormat_Float32)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
+    }
+
+    unsigned int cropX, cropY, cropWidth, cropHeight;
+    GetCrop(cropX, cropY, cropWidth, cropHeight);
+
+    const AffineTransform2D t = AffineTransform2D::Combine(
+          viewTransform, GetTransform(),
+          AffineTransform2D::CreateOffset(cropX, cropY));
+
+    Orthanc::ImageAccessor cropped;
+    alpha_->GetRegion(cropped, cropX, cropY, cropWidth, cropHeight);
+
+    Orthanc::Image tmp(Orthanc::PixelFormat_Grayscale8, buffer.GetWidth(), buffer.GetHeight(), false);
+
+    t.Apply(tmp, cropped, interpolation, true /* clear */);
+
+    // Blit
+    const unsigned int width = buffer.GetWidth();
+    const unsigned int height = buffer.GetHeight();
+
+    float value = foreground_;
+
+    if (useWindowing_)
+    {
+      float center, width;
+      if (scene_.GetWindowing(center, width))
+      {
+        value = center + width / 2.0f;  // TODO: shouldn't it be center alone ?
+      }
+    }
+
+    for (unsigned int y = 0; y < height; y++)
+    {
+      float *q = reinterpret_cast<float*>(buffer.GetRow(y));
+      const uint8_t *p = reinterpret_cast<uint8_t*>(tmp.GetRow(y));
+
+      for (unsigned int x = 0; x < width; x++, p++, q++)
+      {
+        float a = static_cast<float>(*p) / 255.0f;
+
+        *q = (a * value + (1.0f - a) * (*q));
+      }
+    }
+  }
+
+  bool RadiographyAlphaLayer::GetRange(float& minValue,
+                                       float& maxValue) const
+  {
+    if (useWindowing_)
+    {
+      return false;
+    }
+    else
+    {
+      minValue = 0;
+      maxValue = 0;
+
+      if (foreground_ < 0)
+      {
+        minValue = foreground_;
+      }
+
+      if (foreground_ > 0)
+      {
+        maxValue = foreground_;
+      }
+
+      return true;
+    }
+  }
+}