dwmapi: Add DwmUpdateThumbnailProperties stub.

dlls/dwmapi/dwmapi.spec

@@ -42,4 +42,4 @@
 @ stub DwmSetPresentParameters
 @ stdcall DwmSetWindowAttribute(long long ptr long)
 @ stdcall DwmUnregisterThumbnail(long)
-@ stub DwmUpdateThumbnailProperties
+@ stdcall DwmUpdateThumbnailProperties(ptr ptr)

dlls/dwmapi/dwmapi_main.c

@@ -250,3 +250,12 @@ HRESULT WINAPI DwmDetachMilContent(HWND hwnd)
     FIXME("(%p) stub\n", hwnd);
     return E_NOTIMPL;
 }
+
+/**********************************************************************
+ *           DwmUpdateThumbnailProperties         (DWMAPI.@)
+ */
+HRESULT WINAPI DwmUpdateThumbnailProperties(HTHUMBNAIL thumbnail, const DWM_THUMBNAIL_PROPERTIES *props)
+{
+    FIXME("(%p, %p) stub\n", thumbnail, props);
+    return E_NOTIMPL;
+}

include/dwmapi.h

@@ -107,6 +107,16 @@ typedef struct _DWM_BLURBEHIND
     BOOL fTransitionOnMaximized;
 } DWM_BLURBEHIND, *PDWM_BLURBEHIND;
 
+typedef struct _DWM_THUMBNAIL_PROPERTIES
+{
+    DWORD dwFlags;
+    RECT  rcDestination;
+    RECT  rcSource;
+    BYTE  opacity;
+    BOOL  fVisible;
+    BOOL  fSourceClientAreaOnly;
+} DWM_THUMBNAIL_PROPERTIES, *PDWM_THUMBNAIL_PROPERTIES;
+
 #include <poppack.h>
 
 DWMAPI DwmDefWindowProc(HWND, UINT, WPARAM, LPARAM, LRESULT*);
@@ -121,6 +131,7 @@ DWMAPI DwmIsCompositionEnabled(BOOL*);
 DWMAPI DwmRegisterThumbnail(HWND, HWND, PHTHUMBNAIL);
 DWMAPI DwmSetWindowAttribute(HWND, DWORD, LPCVOID, DWORD);
 DWMAPI DwmUnregisterThumbnail(HTHUMBNAIL);
+DWMAPI DwmUpdateThumbnailProperties(HTHUMBNAIL, const DWM_THUMBNAIL_PROPERTIES *);
 
 #ifdef __cplusplus
 }