From c5ad973795da3c0294b0fd949e1d3d3d423e298c Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Sun, 5 Jan 2020 16:48:41 +0000
Subject: [PATCH] Disable scaling by the OS on windows (scale != 100%). Could
 not get this working through the manifest, but this seems to work as well.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4303
---
 src/gui/sdlmain.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/gui/sdlmain.cpp b/src/gui/sdlmain.cpp
index 34ca3f57..5e343d56 100644
--- a/src/gui/sdlmain.cpp
+++ b/src/gui/sdlmain.cpp
@@ -99,6 +99,7 @@ extern char** environ;
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
+#include <winuser.h>
 #if C_DDRAW
 #include <ddraw.h>
 struct private_hwdata {
@@ -1978,10 +1979,22 @@ static void erasemapperfile() {
 	exit(0);
 }
 
+void Disable_OS_Scaling() {
+#if defined (WIN32)
+	typedef BOOL (*function_set_dpi_pointer)();
+	function_set_dpi_pointer function_set_dpi;
+	function_set_dpi = (function_set_dpi_pointer) GetProcAddress(LoadLibrary("user32.dll"), "SetProcessDPIAware");
+	if (function_set_dpi) {
+		function_set_dpi();
+	}
+#endif
+}
 
 //extern void UI_Init(void);
 int main(int argc, char* argv[]) {
 	try {
+		Disable_OS_Scaling(); //Do this early on, maybe override it through some parameter.
+
 		CommandLine com_line(argc,argv);
 		Config myconf(&com_line);
 		control=&myconf;