From ab7271b986e00dd1377b66dd1de72e03a67a8993 Mon Sep 17 00:00:00 2001
From: narzoul <narzoul@users.noreply.github.com>
Date: Sun, 2 Jul 2017 16:38:31 +0200
Subject: [PATCH] Disable primary surface updates during display mode change

---
 DDrawCompat/Win32/DisplayMode.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/DDrawCompat/Win32/DisplayMode.cpp b/DDrawCompat/Win32/DisplayMode.cpp
index ef3770b..e8afbb0 100644
--- a/DDrawCompat/Win32/DisplayMode.cpp
+++ b/DDrawCompat/Win32/DisplayMode.cpp
@@ -4,6 +4,7 @@
 #include "Common/CompatPtr.h"
 #include "Common/Hook.h"
 #include "DDraw/DirectDraw.h"
+#include "DDraw/RealPrimarySurface.h"
 #include "Win32/DisplayMode.h"
 
 BOOL WINAPI DWM8And16Bit_IsShimApplied_CallOut() { return FALSE; };
@@ -52,6 +53,7 @@ namespace
 		{
 			prevDevMode.dmSize = sizeof(prevDevMode);
 			origEnumDisplaySettingsEx(lpszDeviceName, ENUM_CURRENT_SETTINGS, &prevDevMode, 0);
+			DDraw::RealPrimarySurface::disableUpdates();
 		}
 
 		BOOL result = FALSE;
@@ -97,6 +99,11 @@ namespace
 			}
 		}
 
+		if (!(dwflags & CDS_TEST))
+		{
+			DDraw::RealPrimarySurface::enableUpdates();
+		}
+
 		return result;
 	}