From 70ac47f84b27eaa801ace59bcfa0c119967f172e Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Thu, 17 Aug 2017 12:17:48 +0100
Subject: [PATCH] render the overlay everytime is DrawFPS is enabled or
 DirtyRects is enabled.

otherwise only composite when required.
---
 .../Rendering/DeferredRenderer.cs             | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs b/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs
index b7e8b45945..d3d6776efa 100644
--- a/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs
+++ b/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs
@@ -178,12 +178,16 @@ namespace Avalonia.Rendering
 
         private void Render(Scene scene)
         {
-            _dirtyRectsDisplay.Tick();
+            bool renderOverlay = DrawDirtyRects || DrawFps;
+            bool composite = false;
 
-            if (scene.Size != Size.Empty)
+            if (renderOverlay)
             {
-                RenderOverlay(scene);
+                _dirtyRectsDisplay.Tick();
+            }
 
+            if (scene.Size != Size.Empty)
+            {
                 if (scene.Generation != _lastSceneId)
                 {
                     _layers.Update(scene);
@@ -196,6 +200,16 @@ namespace Avalonia.Rendering
 
                     _lastSceneId = scene.Generation;
 
+                    composite = true;
+                }
+
+                if (renderOverlay)
+                {
+                    RenderOverlay(scene);
+                    RenderComposite(scene);
+                }
+                else if(composite)
+                {
                     RenderComposite(scene);
                 }
             }