From fdb68480463776f8d5cd125ce4eb867a5a9ebc75 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Mon, 14 Sep 2020 02:55:13 -0700
Subject: [PATCH] check windows  10 build number and set composition flag
 before create window is called.

---
 src/Windows/Avalonia.Win32/WindowImpl.cs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs
index fb9f7783b1..c100b3308d 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.cs
@@ -101,15 +101,16 @@ namespace Avalonia.Win32
             };
             _rendererLock = new ManagedDeferredRendererLock();
 
+            _isUsingComposition = Win32Platform.WindowsVersion.Major >= 10 && Win32Platform.WindowsVersion.Build >= 14393 &&
+                    Win32GlManager.EglFeature.Display is AngleWin32EglDisplay angleDisplay &&
+                    angleDisplay.PlatformApi == AngleOptions.PlatformApi.DirectX11;
 
             CreateWindow();
             _framebuffer = new FramebufferManager(_hwnd);
 
             if (Win32GlManager.EglFeature != null)
             {
-                if (Win32Platform.WindowsVersion.Major >= 10 &&
-                    Win32GlManager.EglFeature.Display is AngleWin32EglDisplay angleDisplay &&
-                    angleDisplay.PlatformApi == AngleOptions.PlatformApi.DirectX11)
+                if (_isUsingComposition)
                 {
                     var cgl = new CompositionEglGlPlatformSurface(Win32GlManager.EglFeature.DeferredContext, this);
                     cgl.AttachToCompositionTree(_hwnd);