newvideo: add useDirectRenderer (for client)

cf #492

Change-Id: Ieb922ad29136b5f607c2fc0086fa4cfd120a9bfb

src/api/newvideo.h

@@ -144,6 +144,8 @@ public:
      */
     void useAVFrame(bool useAVFrame);
 
+    bool useDirectRenderer() const;
+
 Q_SIGNALS:
     /**
      * Emitted when a new frame is ready

src/newvideo.cpp

@@ -132,6 +132,16 @@ Renderer::useAVFrame(bool useAVFrame)
 #endif
 }
 
+bool
+Renderer::useDirectRenderer() const
+{
+#ifdef ENABLE_LIBWRAP
+    return true;
+#else
+    return false;
+#endif
+}
+
 QString
 Renderer::getId() const
 {