dwmapi: Implement DwmIsCompositionEnabled.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=44055Signed-off-by: Gijs Vermeulen <gijsvrm@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dwmapi: Implement DwmIsCompositionEnabled.
53375d0f · Gijs Vermeulen · Alexandre Julliard · 2698591a · 53375d0f
Commit 53375d0f authored Sep 22, 2020 by Gijs Vermeulen Committed by Alexandre Julliard Sep 25, 2020
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dwmapi_main.c dlls/dwmapi/dwmapi_main.c +8 -7

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--- a/dlls/dwmapi/dwmapi_main.c
+++ b/dlls/dwmapi/dwmapi_main.c
@@ -51,19 +51,20 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
 */
 HRESULT WINAPI DwmIsCompositionEnabled(BOOL *enabled)
 {
-    static int once;
-    if (!once)
-    {
-        FIXME("%p\n", enabled);
-        once = 1;
-    }
-    else
+    OSVERSIONINFOW version;
+
    TRACE("%p\n", enabled);

    if (!enabled)
        return E_INVALIDARG;

+    version.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
+
+    if (!GetVersionExW(&version))
        *enabled = FALSE;
+    else
+        *enabled = (version.dwMajorVersion > 6 || (version.dwMajorVersion == 6 && version.dwMinorVersion >= 3));
+
    return S_OK;
 }