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dwmapi: Fallback to 60Hz if the display frequency is invalid in get_display_frequency().
DwmGetCompositionTimingInfo() may throw a zero division exception if the display reports a 0Hz frequency, which can happen when testing under Xephyr without -fakescreenfps option.
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@ -213,12 +213,16 @@ HRESULT WINAPI DwmRegisterThumbnail(HWND dest, HWND src, PHTHUMBNAIL thumbnail_i
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static int get_display_frequency(void)
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{
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DEVMODEA mode;
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DEVMODEW mode;
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BOOL ret;
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memset(&mode, 0, sizeof(mode));
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mode.dmSize = sizeof(mode);
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if (EnumDisplaySettingsA(NULL, ENUM_CURRENT_SETTINGS, &mode))
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ret = EnumDisplaySettingsExW(NULL, ENUM_CURRENT_SETTINGS, &mode, 0);
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if (ret && mode.dmFields & DM_DISPLAYFREQUENCY && mode.dmDisplayFrequency)
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{
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return mode.dmDisplayFrequency;
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}
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else
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{
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WARN("Failed to query display frequency, returning a fallback value.\n");
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