Paul Gofman : dwmapi: Fill qpcVBlank in DwmGetCompositionTimingInfo().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 62fa96df16a0285cce1694ce47eef946f75bfd42
URL:    https://gitlab.winehq.org/wine/wine/-/commit/62fa96df16a0285cce1694ce47eef94...

Author: Paul Gofman <pgofman(a)codeweavers.com>
Date:   Mon Jan  9 15:53:32 2023 -0600

dwmapi: Fill qpcVBlank in DwmGetCompositionTimingInfo().

---

 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;
 }