[PATCH 1/1] dwmapi: Fill qpcVBlank in DwmGetCompositionTimingInfo().

[Paul Gofman]

From: Paul Gofman

---
 dlls/dwmapi/dwmapi_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dlls/dwmapi/dwmapi_main.c b/dlls/dwmapi/dwmapi_main.c
index 56730f79cac..9ec03185f36 100644
--- a/dlls/dwmapi/dwmapi_main.c
+++ b/dlls/dwmapi/dwmapi_main.c
@@ -235,7 +235,7 @@ static int get_display_frequency(void)
  */
 HRESULT WINAPI DwmGetCompositionTimingInfo(HWND hwnd, DWM_TIMING_INFO *info)
 {
-    LARGE_INTEGER performance_frequency;
+    LARGE_INTEGER performance_frequency, qpc;
     static int i, display_frequency;

if (!info)
@@ -258,6 +258,9 @@ HRESULT WINAPI DwmGetCompositionTimingInfo(HWND hwnd, DWM_TIMING_INFO *info)
     QueryPerformanceFrequency(&performance_frequency);
     info->qpcRefreshPeriod = performance_frequency.QuadPart / display_frequency;

+    QueryPerformanceCounter(&qpc);
+    info->qpcVBlank = (qpc.QuadPart / info->qpcRefreshPeriod) * info->qpcRefreshPeriod;
+
     return S_OK;
 }