--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/OpenGLCompositor.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,258 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 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 "OpenGLCompositor.h"
+
+#include "Internals/OpenGLAdvancedPolylineRenderer.h"
+#include "Internals/OpenGLBasicPolylineRenderer.h"
+#include "Internals/OpenGLColorTextureRenderer.h"
+#include "Internals/OpenGLFloatTextureRenderer.h"
+#include "Internals/OpenGLInfoPanelRenderer.h"
+#include "Internals/OpenGLLookupTableTextureRenderer.h"
+#include "Internals/OpenGLTextRenderer.h"
+
+namespace OrthancStone
+{
+  class OpenGLCompositor::Font : public boost::noncopyable
+  {
+  private:
+    std::unique_ptr<GlyphTextureAlphabet>   alphabet_;
+    std::unique_ptr<OpenGL::OpenGLTexture>  texture_;
+
+  public:
+    Font(OpenGL::IOpenGLContext& context, const GlyphBitmapAlphabet& dict)
+    {
+      alphabet_.reset(new GlyphTextureAlphabet(dict));
+      texture_.reset(new OpenGL::OpenGLTexture(context));
+
+      std::unique_ptr<Orthanc::ImageAccessor> bitmap(alphabet_->ReleaseTexture());
+      texture_->Load(*bitmap, true /* enable linear interpolation */);
+    }
+
+    OpenGL::OpenGLTexture& GetTexture() const
+    {
+      assert(texture_.get() != NULL);
+      return *texture_;
+    }
+
+    const GlyphTextureAlphabet& GetAlphabet() const
+    {
+      assert(alphabet_.get() != NULL);
+      return *alphabet_;
+    }
+  };
+
+  const OpenGLCompositor::Font* OpenGLCompositor::GetFont(size_t fontIndex) const
+  {
+    Fonts::const_iterator found = fonts_.find(fontIndex);
+
+    if (found == fonts_.end())
+    {
+      return NULL;  // Unknown font, nothing should be drawn
+    }
+    else
+    {
+      assert(found->second != NULL);
+      return found->second;
+    }
+  }
+
+  Internals::CompositorHelper::ILayerRenderer* OpenGLCompositor::Create(const ISceneLayer& layer)
+  {
+    if (!context_.IsContextLost())
+    {
+      switch (layer.GetType())
+      {
+      case ISceneLayer::Type_InfoPanel:
+        return new Internals::OpenGLInfoPanelRenderer
+        (context_, colorTextureProgram_, dynamic_cast<const InfoPanelSceneLayer&>(layer));
+
+      case ISceneLayer::Type_ColorTexture:
+        return new Internals::OpenGLColorTextureRenderer
+        (context_, colorTextureProgram_, dynamic_cast<const ColorTextureSceneLayer&>(layer));
+
+      case ISceneLayer::Type_FloatTexture:
+        return new Internals::OpenGLFloatTextureRenderer
+        (context_, floatTextureProgram_, dynamic_cast<const FloatTextureSceneLayer&>(layer));
+
+      case ISceneLayer::Type_LookupTableTexture:
+        return new Internals::OpenGLLookupTableTextureRenderer
+        (context_, colorTextureProgram_, dynamic_cast<const LookupTableTextureSceneLayer&>(layer));
+
+      case ISceneLayer::Type_Polyline:
+        return new Internals::OpenGLAdvancedPolylineRenderer
+        (context_, linesProgram_, dynamic_cast<const PolylineSceneLayer&>(layer));
+        //return new Internals::OpenGLBasicPolylineRenderer(context_, dynamic_cast<const PolylineSceneLayer&>(layer));
+
+      case ISceneLayer::Type_Text:
+      {
+        const TextSceneLayer& l = dynamic_cast<const TextSceneLayer&>(layer);
+        const Font* font = GetFont(l.GetFontIndex());
+        if (font == NULL)
+        {
+          LOG(WARNING) << "There is no font at index " << l.GetFontIndex();
+          return NULL;
+        }
+        else
+        {
+          return new Internals::OpenGLTextRenderer
+          (context_, textProgram_, font->GetAlphabet(), font->GetTexture(), l);
+        }
+      }
+
+      default:
+        return NULL;
+      }
+    }
+    else
+    {
+      // context is lost. returning null.
+      return NULL;
+    }
+  }
+
+  OpenGLCompositor::OpenGLCompositor(OpenGL::IOpenGLContext& context) :
+    context_(context),
+    colorTextureProgram_(context),
+    floatTextureProgram_(context),
+    linesProgram_(context),
+    textProgram_(context),
+    canvasWidth_(0),
+    canvasHeight_(0)
+  {
+    if (!context_.IsContextLost())
+    {
+      canvasWidth_ = context_.GetCanvasWidth();
+      canvasHeight_ = context_.GetCanvasHeight();
+    }
+
+    ResetScene();
+  }
+
+  OpenGLCompositor::~OpenGLCompositor()
+  {
+    if (!context_.IsContextLost())
+    {
+      try
+      {
+        try
+        {
+          context_.MakeCurrent(); // this can throw if context lost!
+        }
+        catch (...)
+        {
+          LOG(ERROR) << "context_.MakeCurrent() failed in OpenGLCompositor::~OpenGLCompositor()!";
+        }
+
+        for (Fonts::iterator it = fonts_.begin(); it != fonts_.end(); ++it)
+        {
+          try
+          {
+
+            assert(it->second != NULL);
+            delete it->second;
+          }
+          catch (...)
+          {
+            LOG(ERROR) << "Exception thrown while deleting OpenGL-based font!";
+          }
+        }
+      }
+      catch (...)
+      {
+        // logging threw an exception!
+      }
+    }
+  }
+
+  void OpenGLCompositor::Refresh(const Scene2D& scene)
+  {
+    if (!context_.IsContextLost())
+    {
+      context_.MakeCurrent(); // this can throw if context lost!
+      canvasWidth_ = context_.GetCanvasWidth();
+      canvasHeight_ = context_.GetCanvasHeight();
+
+      glViewport(0, 0, canvasWidth_, canvasHeight_);
+      glClearColor(0, 0, 0, 1);
+      glClear(GL_COLOR_BUFFER_BIT);
+
+      helper_->Refresh(scene, canvasWidth_, canvasHeight_);
+
+      context_.SwapBuffer();
+    }
+  }
+
+  void OpenGLCompositor::SetFont(size_t index,
+                                 const GlyphBitmapAlphabet& dict)
+  {
+    if (!context_.IsContextLost())
+    {
+      context_.MakeCurrent(); // this can throw if context lost
+
+      std::unique_ptr<Font> font(new Font(context_, dict));
+
+      Fonts::iterator found = fonts_.find(index);
+
+      if (found == fonts_.end())
+      {
+        fonts_[index] = font.release();
+      }
+      else
+      {
+        assert(found->second != NULL);
+        delete found->second;
+
+        found->second = font.release();
+      }
+    }
+  }
+
+#if ORTHANC_ENABLE_LOCALE == 1
+  void OpenGLCompositor::SetFont(size_t index,
+                                 const std::string& ttf,
+                                 unsigned int fontSize,
+                                 Orthanc::Encoding codepage)
+  {
+    if (!context_.IsContextLost())
+    {
+      FontRenderer renderer;
+      renderer.LoadFont(ttf, fontSize);
+
+      GlyphBitmapAlphabet dict;
+      dict.LoadCodepage(renderer, codepage);
+
+      SetFont(index, dict);
+    }
+  }
+#endif
+
+
+  void OpenGLCompositor::RefreshCanvasSize()
+  {
+    if (!context_.IsContextLost())
+    {
+      context_.MakeCurrent(); // this can throw if context lost!
+      context_.RefreshCanvasSize();  // Difference with Refresh(scene)
+      canvasWidth_ = context_.GetCanvasWidth();
+      canvasHeight_ = context_.GetCanvasHeight();
+    }
+  }
+}