DIRECTOR: Optimize screen copying for zoomBoxes

2 files changed, 3 insertions, 1 deletions

diff --git a/engines/director/frame.cpp b/engines/director/frame.cpp
index a68fca4482..14951cf1a6 100644
--- a/engines/director/frame.cpp
+++ b/engines/director/frame.cpp
@@ -419,7 +419,8 @@ void Frame::prepareFrame(Score *score) {
 		playSoundChannel();
 	}
 
-	score->_backSurface->copyFrom(*score->_surface);
+	if (_vm->getCurrentScore()->haveZoomBox())
+		score->_backSurface->copyFrom(*score->_surface);
 
 	g_system->copyRectToScreen(score->_surface->getPixels(), score->_surface->pitch, 0, 0, score->_surface->getBounds().width(), score->_surface->getBounds().height());
 }
diff --git a/engines/director/score.h b/engines/director/score.h
index 388c14e73b..bc7a41a733 100644
--- a/engines/director/score.h
+++ b/engines/director/score.h
@@ -105,6 +105,7 @@ public:
 
 	void addZoomBox(ZoomBox *box);
 	void renderZoomBox(bool redraw = false);
+	bool haveZoomBox() { return !_zoomBoxes.empty(); }
 
 private:
 	void update();