1 files changed, 55 insertions, 0 deletions

diff --git a/src/dutil/inc/dpiutil.h b/src/dutil/inc/dpiutil.h
new file mode 100644
index 00000000..c6f73b02
--- /dev/null
+++ b/src/dutil/inc/dpiutil.h
@@ -0,0 +1,55 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// from WinUser.h
+#ifndef WM_DPICHANGED
+#define WM_DPICHANGED       0x02E0
+#endif
+#ifndef USER_DEFAULT_SCREEN_DPI
+#define USER_DEFAULT_SCREEN_DPI 96
+#endif
+
+typedef struct _DPIU_WINDOW_CONTEXT
+{
+    UINT nDpi;
+} DPIU_WINDOW_CONTEXT;
+
+typedef HRESULT (APIENTRY *PFN_GETDPIFORMONITOR)(
+    __in HMONITOR hmonitor,
+    __in MONITOR_DPI_TYPE dpiType,
+    __in UINT* dpiX,
+    __in UINT* dpiY
+    );
+typedef UINT (APIENTRY *PFN_GETDPIFORWINDOW)(
+    __in HWND hwnd
+    );
+
+void DAPI DpiuInitialize();
+void DAPI DpiuUninitialize();
+
+/********************************************************************
+ DpiuGetWindowContext - get the DPI context of the given window.
+
+*******************************************************************/
+void DAPI DpiuGetWindowContext(
+    __in HWND hWnd,
+    __in DPIU_WINDOW_CONTEXT* pWindowContext
+    );
+
+/********************************************************************
+ DpiuScaleValue - scale the value to the target DPI.
+
+*******************************************************************/
+int DAPI DpiuScaleValue(
+    __in int nDefaultDpiValue,
+    __in UINT nTargetDpi
+    );
+
+#ifdef __cplusplus
+}
+#endif