Added virtual AbstractPipeline::paint(), which is called by CampvisPainter at...

Added virtual AbstractPipeline::paint(), which is called by CampvisPainter at the very end of rendering. This method can be used to render additional overlays directly in the pipeline.

application/campvispainter.cpp

@@ -74,7 +74,8 @@ namespace campvis {
         const ImageRepresentationGL* repGL = nullptr;
         if (dh.getData() != nullptr) {
             rd = dynamic_cast<const RenderData*>(dh.getData());
-            repGL = dynamic_cast<const ImageRepresentationGL*>(dh.getData());
+            if (const ImageData* id = dynamic_cast<const ImageData*>(dh.getData()))
+                repGL = id->getRepresentation<ImageRepresentationGL>();
         }
 
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -119,6 +120,8 @@ namespace campvis {
         _copyShader->deactivate();
         LGL_ERROR;
 
+        _pipeline->paint();
+
         getCanvas()->swap();
     }
 

core/pipeline/abstractpipeline.cpp

@@ -145,6 +145,10 @@ namespace campvis {
         }
     }
 
+    void AbstractPipeline::paint() {
+        // render nothing. May be overridden in sub classes.
+    }
+
     const DataContainer& AbstractPipeline::getDataContainer() const {
         return *_data;
     }
@@ -293,6 +297,5 @@ namespace campvis {
 
         processor->setEnabled(enabledState);
     }
-
-
+    
 }

core/pipeline/abstractpipeline.h

@@ -127,6 +127,13 @@ namespace campvis {
          */
         virtual void executePipeline() = 0;
 
+        /**
+         * Paints an additional overlay directly onto the frame buffer.
+         * Gets called from CampvisPainter just after copying the rendered image and just before
+         * swapping the canvas' buffers. The default implementation performs nothing.
+         */
+        virtual void paint();
+
         /**
          * Returns the DataContainer of this pipeline, const version.
          * \return _data