Adhere to new core API (#146)

Author: alxvth

src/LayersRenderer.cpp

@@ -16,8 +16,7 @@
 #include <stdexcept>
 
 LayersRenderer::LayersRenderer(QOpenGLWidget* parent) :
-    QObject(parent),
-    mv::Renderer(),
+    mv::Renderer(parent),
     _zoomSensitivity(0.1f),
     _zoomMargin(50.0f),
     _worldBoundingRectangle(),

src/LayersRenderer.h

@@ -22,7 +22,7 @@ class Renderable;
  *
  * @author Thomas Kroes
  */
-class LayersRenderer : public QObject, public mv::Renderer
+class LayersRenderer : public mv::Renderer
 {
     Q_OBJECT
 
@@ -49,6 +49,18 @@ class LayersRenderer : public QObject, public mv::Renderer
     /** Resizes the renderer */
     void resize(QSize renderSize) override {};
 
+    /**
+     * Get the render size
+     * @return Render size
+     */
+    QSize getRenderSize() const override { return {}; };
+
+    /** Begin rendering */
+    void beginRender() override {};
+
+    /** End rendering */
+    void endRender() override {};
+
 public: // Coordinate conversions
 
     /**