Few more doxygen docs for QgsMapLayerRenderer and subclasses

Author: wonder-sk

src/core/qgsmaplayerrenderer.h

@@ -37,6 +37,8 @@
  * 2. renderer job (still in GUI thread) stores the renderer for later use.
  * 3. renderer job (in worker thread) calls QgsMapLayerRenderer::render()
  * 4. renderer job (again in GUI thread) will check errors() and report them
+ *
+ * @note added in 2.4
  */
 class CORE_EXPORT QgsMapLayerRenderer
 {

src/core/qgspluginlayer.cpp

@@ -37,7 +37,10 @@ QgsLegendSymbologyList QgsPluginLayer::legendSymbologyItems( const QSize& iconSi
   return QgsLegendSymbologyList();
 }
 
-/** Fallback layer renderer implementation for layer that do not support map renderer yet. */
+/** Fallback layer renderer implementation for layer that do not support map renderer yet.
+ *
+ * @note added in 2.4
+ */
 class QgsPluginLayerRenderer : public QgsMapLayerRenderer
 {
   public:

src/core/qgsvectorlayerrenderer.h

@@ -42,6 +42,11 @@ typedef QList<int> QgsAttributeList;
 #include "qgsmaplayerrenderer.h"
 
 
+/**
+ * Implementation of threaded rendering for vector layers.
+ *
+ * @note added in 2.4
+ */
 class QgsVectorLayerRenderer : public QgsMapLayerRenderer
 {
   public:

src/core/raster/qgsrasterlayerrenderer.h

@@ -26,6 +26,11 @@ class QgsRasterPipe;
 struct QgsRasterViewPort;
 class QgsRenderContext;
 
+/**
+ * Implementation of threaded rendering for raster layers.
+ *
+ * @note added in 2.4
+ */
 class QgsRasterLayerRenderer : public QgsMapLayerRenderer
 {
   public: