--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/GrayscaleFrameRenderer.cpp	Fri Oct 14 15:34:11 2016 +0200
@@ -0,0 +1,144 @@
+/**
+ * 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/>.
+ **/
+
+
+#include "GrayscaleFrameRenderer.h"
+
+#include "../Orthanc/Core/OrthancException.h"
+
+namespace OrthancStone
+{
+  CairoSurface* GrayscaleFrameRenderer::GenerateDisplay(const RenderStyle& style)
+  {
+    std::auto_ptr<CairoSurface> result;
+
+    float windowCenter, windowWidth;
+    style.ComputeWindowing(windowCenter, windowWidth,
+                           defaultWindowCenter_, defaultWindowWidth_);
+
+    float x0 = windowCenter - windowWidth / 2.0f;
+    float x1 = windowCenter + windowWidth / 2.0f;
+
+    //LOG(INFO) << "Window: " << x0 << " => " << x1;
+
+    result.reset(new CairoSurface(frame_->GetWidth(), frame_->GetHeight()));
+
+    const uint8_t* lut = NULL;
+    if (style.applyLut_)
+    {
+      if (Orthanc::EmbeddedResources::GetFileResourceSize(style.lut_) != 3 * 256)
+      {
+        // Invalid colormap
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+      }
+
+      lut = reinterpret_cast<const uint8_t*>(Orthanc::EmbeddedResources::GetFileResourceBuffer(style.lut_));
+    }
+      
+    Orthanc::ImageAccessor target = result->GetAccessor();
+    for (unsigned int y = 0; y < target.GetHeight(); y++)
+    {
+      const float* p = reinterpret_cast<const float*>(frame_->GetConstRow(y));
+      uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
+
+      for (unsigned int x = 0; x < target.GetWidth(); x++, p++, q += 4)
+      {
+        uint8_t v = 0;
+        if (windowWidth >= 0.001f)  // Avoid division by zero
+        {
+          if (*p >= x1)
+          {
+            v = 255;
+          }
+          else if (*p <= x0)
+          {
+            v = 0;
+          }
+          else
+          {
+            // https://en.wikipedia.org/wiki/Linear_interpolation
+            v = static_cast<uint8_t>(255.0f * (*p - x0) / (x1 - x0));
+          }
+
+          if (style.reverse_)
+          {
+            v = 255 - v;
+          }
+        }
+
+        if (style.applyLut_)
+        {
+          assert(lut != NULL);
+          q[3] = 255;
+          q[2] = lut[3 * v];
+          q[1] = lut[3 * v + 1];
+          q[0] = lut[3 * v + 2];
+        }
+        else
+        {
+          q[3] = 255;
+          q[2] = v;
+          q[1] = v;
+          q[0] = v;
+        }
+      }
+    }
+
+    return result.release();
+  }
+
+
+  GrayscaleFrameRenderer::GrayscaleFrameRenderer(Orthanc::ImageAccessor* frame,
+                                                 const DicomFrameConverter& converter,
+                                                 const SliceGeometry& viewportSlice,
+                                                 const SliceGeometry& frameSlice,
+                                                 double pixelSpacingX,
+                                                 double pixelSpacingY,
+                                                 bool isFullQuality) :
+    FrameRenderer(viewportSlice, frameSlice, pixelSpacingX, pixelSpacingY, isFullQuality),
+    frame_(frame),
+    defaultWindowCenter_(converter.GetDefaultWindowCenter()),
+    defaultWindowWidth_(converter.GetDefaultWindowWidth())
+  {
+    if (frame == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+
+    converter.ConvertFrame(frame_);
+    assert(frame_.get() != NULL);
+
+    if (frame_->GetFormat() != Orthanc::PixelFormat_Float32)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
+    }
+  }
+}