internal static void InitializeDpiHelperForWinforms()
{
if (s_isInitializeDpiHelperForWinforms)
{
return;
}
// initialize shared fields
Initialize();
if (OsVersion.IsWindows10_1607OrGreater)
{
// We are on Windows 10/1603 or greater, but we could still be DpiUnaware or SystemAware, so let's find that out...
IntPtr hProcess = Kernel32.OpenProcess(
Kernel32.ProcessAccessOptions.QUERY_INFORMATION,
BOOL.FALSE,
Kernel32.GetCurrentProcessId());
SHCore.GetProcessDpiAwareness(hProcess, out SHCore.PROCESS_DPI_AWARENESS processDpiAwareness);
// Only if we're not, it makes sense to query for PerMonitorV2 awareness from now on, if needed.
if (!(processDpiAwareness == SHCore.PROCESS_DPI_AWARENESS.UNAWARE ||
processDpiAwareness == SHCore.PROCESS_DPI_AWARENESS.SYSTEM_AWARE))
{
s_doesNeedQueryForPerMonitorV2Awareness = true;
}
}
if (IsScalingRequired || s_doesNeedQueryForPerMonitorV2Awareness)
{
s_isScalingRequirementMet = true;
}
s_isInitializeDpiHelperForWinforms = true;
}
/// <summary>
/// Gets the DPI awareness.
/// </summary>
/// <returns>The thread's/process' current HighDpi mode</returns>
internal static HighDpiMode GetWinformsApplicationDpiAwareness()
{
// For Windows 10 RS2 and above
if (OsVersion.IsWindows10_1607OrGreater)
{
DpiAwarenessContext dpiAwareness = CommonUnsafeNativeMethods.GetThreadDpiAwarenessContext();
if (CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(dpiAwareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE))
{
return(HighDpiMode.SystemAware);
}
if (CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(dpiAwareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNAWARE))
{
return(HighDpiMode.DpiUnaware);
}
if (CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(dpiAwareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2))
{
return(HighDpiMode.PerMonitorV2);
}
if (CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(dpiAwareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE))
{
return(HighDpiMode.PerMonitor);
}
if (CommonUnsafeNativeMethods.TryFindDpiAwarenessContextsEqual(dpiAwareness, DpiAwarenessContext.DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED))
{
return(HighDpiMode.DpiUnawareGdiScaled);
}
}
else if (OsVersion.IsWindows8_1OrGreater)
{
SHCore.GetProcessDpiAwareness(IntPtr.Zero, out SHCore.PROCESS_DPI_AWARENESS processDpiAwareness);
switch (processDpiAwareness)
{
case SHCore.PROCESS_DPI_AWARENESS.UNAWARE:
return(HighDpiMode.DpiUnaware);
case SHCore.PROCESS_DPI_AWARENESS.SYSTEM_AWARE:
return(HighDpiMode.SystemAware);
case SHCore.PROCESS_DPI_AWARENESS.PER_MONITOR_AWARE:
return(HighDpiMode.PerMonitor);
}
}
else
{
// Available on Vista and higher
return(User32.IsProcessDPIAware().IsTrue() ? HighDpiMode.SystemAware : HighDpiMode.DpiUnaware);
}
// We should never get here, except someone ported this with force to < Windows 7.
return(HighDpiMode.DpiUnaware);
}
private static bool GetPerMonitorAware()
{
if (!OsVersion.IsWindows10_1607OrGreater)
{
return(false);
}
HRESULT result = SHCore.GetProcessDpiAwareness(
IntPtr.Zero,
out SHCore.PROCESS_DPI_AWARENESS processDpiAwareness);
Debug.Assert(result.Succeeded(), $"Failed to get ProcessDpi HRESULT: {result}");
Debug.Assert(Enum.IsDefined(typeof(SHCore.PROCESS_DPI_AWARENESS), processDpiAwareness));
return(result.Succeeded() && processDpiAwareness switch
{
SHCore.PROCESS_DPI_AWARENESS.UNAWARE => false,
SHCore.PROCESS_DPI_AWARENESS.SYSTEM_AWARE => false,
SHCore.PROCESS_DPI_AWARENESS.PER_MONITOR_AWARE => true,
_ => true
});