dwmapi: Fill qpcVBlank in DwmGetCompositionTimingInfo().

62fa96df · Paul Gofman · Alexandre Julliard · 09cafcc3 · 62fa96df
Commit 62fa96df authored Jan 09, 2023 by Paul Gofman Committed by Alexandre Julliard Jan 10, 2023
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dwmapi_main.c dlls/dwmapi/dwmapi_main.c +4 -1

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--- 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;
 }