--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Scene2D/Internals/OpenGLLookupTableTextureRenderer.cpp	Mon Jun 24 14:35:00 2019 +0200
@@ -0,0 +1,140 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 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 "OpenGLLookupTableTextureRenderer.h"
+
+namespace OrthancStone
+{
+  namespace Internals
+  {
+    void OpenGLLookupTableTextureRenderer::LoadTexture(
+      const LookupTableTextureSceneLayer& layer)
+    {
+      const Orthanc::ImageAccessor& source = layer.GetTexture();
+      const unsigned int width = source.GetWidth();
+      const unsigned int height = source.GetHeight();
+
+      if ((texture_.get() == NULL) || 
+          (texture_->GetWidth() != width) || 
+          (texture_->GetHeight() != height))
+      {
+
+        texture_.reset(new Orthanc::Image(
+          Orthanc::PixelFormat_RGBA32,
+          width,
+          height,
+          false));
+      }
+
+      {
+
+        const float a = layer.GetMinValue();
+        float slope = 0;
+
+        if (layer.GetMinValue() >= layer.GetMaxValue())
+        {
+          slope = 0;
+        }
+        else
+        {
+          slope = 256.0f / (layer.GetMaxValue() - layer.GetMinValue());
+        }
+
+        Orthanc::ImageAccessor target;
+        texture_->GetWriteableAccessor(target);
+
+        const std::vector<uint8_t>& lut = layer.GetLookupTable();
+        if (lut.size() != 4 * 256)
+        {
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+        }
+
+        assert(source.GetFormat() == Orthanc::PixelFormat_Float32 &&
+          target.GetFormat() == Orthanc::PixelFormat_RGBA32 &&
+          sizeof(float) == 4);
+
+        for (unsigned int y = 0; y < height; y++)
+        {
+          const float* p = reinterpret_cast<const float*>(source.GetConstRow(y));
+          uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
+
+          for (unsigned int x = 0; x < width; x++)
+          {
+            float v = (*p - a) * slope;
+            if (v <= 0)
+            {
+              v = 0;
+            }
+            else if (v >= 255)
+            {
+              v = 255;
+            }
+
+            uint8_t vv = static_cast<uint8_t>(v);
+
+            q[0] = lut[4 * vv + 0];  // R
+            q[1] = lut[4 * vv + 1];  // G
+            q[2] = lut[4 * vv + 2];  // B
+            q[3] = lut[4 * vv + 3];  // A
+
+            p++;
+            q += 4;
+          }
+        }
+      }
+
+      context_.MakeCurrent();
+      glTexture_.reset(new OpenGL::OpenGLTexture);
+      glTexture_->Load(*texture_, layer.IsLinearInterpolation());
+      layerTransform_ = layer.GetTransform();
+    }
+
+    
+    OpenGLLookupTableTextureRenderer::OpenGLLookupTableTextureRenderer(
+      OpenGL::IOpenGLContext&                 context,
+      OpenGLColorTextureProgram&              program,
+      const LookupTableTextureSceneLayer&     layer)
+      : context_(context)
+      , program_(program)
+    {
+      LoadTexture(layer);
+    }
+
+    
+    void OpenGLLookupTableTextureRenderer::Render(const AffineTransform2D& transform)
+    {
+      if (glTexture_.get() != NULL)
+      {
+        program_.Apply(
+          *glTexture_, 
+          AffineTransform2D::Combine(transform, layerTransform_), 
+          true);
+      }
+    }
+
+    
+    void OpenGLLookupTableTextureRenderer::Update(const ISceneLayer& layer)
+    {
+      // Should never happen (no revisions in color textures)
+      LoadTexture(dynamic_cast<const LookupTableTextureSceneLayer&>(layer));
+    }
+  }
+}