/// <summary>
/// Sets the DPI awareness. If not available on the current OS, it falls back to the next possible.
/// </summary>
/// <returns>true/false - If the process DPI awareness is successfully set, returns true. Otherwise false.</returns>
internal static bool SetWinformsApplicationDpiAwareness(HighDpiMode highDpiMode)
{
NativeMethods.PROCESS_DPI_AWARENESS dpiFlag = NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_DPI_UNINITIALIZED;
// For Windows 10 RS2 and above
if (ApiHelper.IsApiAvailable(ExternDll.User32, nameof(SafeNativeMethods.SetProcessDpiAwarenessContext)))
{
int rs2AndAboveDpiFlag;
switch (highDpiMode)
{
case HighDpiMode.SystemAware:
rs2AndAboveDpiFlag = NativeMethods.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE;
break;
case HighDpiMode.PerMonitor:
rs2AndAboveDpiFlag = NativeMethods.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE;
break;
case HighDpiMode.PerMonitorV2:
// Necessary for RS1, since this SetProcessDpiAwarenessContext IS available here.
rs2AndAboveDpiFlag = SafeNativeMethods.IsValidDpiAwarenessContext(NativeMethods.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) ?
NativeMethods.DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 :
NativeMethods.DPI_AWARENESS_CONTEXT_SYSTEM_AWARE;
break;
case HighDpiMode.DpiUnawareGdiScaled:
// Let's make sure, we do not try to set a value which has been introduced in later Windows releases.
rs2AndAboveDpiFlag = SafeNativeMethods.IsValidDpiAwarenessContext(NativeMethods.DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED) ?
NativeMethods.DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED :
NativeMethods.DPI_AWARENESS_CONTEXT_UNAWARE;
break;
default:
rs2AndAboveDpiFlag = NativeMethods.DPI_AWARENESS_CONTEXT_UNAWARE;
break;
}
return(SafeNativeMethods.SetProcessDpiAwarenessContext(rs2AndAboveDpiFlag));
}
// For operating systems Windows 8.1 to Windows 10 RS1 version.
else if (ApiHelper.IsApiAvailable(ExternDll.ShCore, nameof(SafeNativeMethods.SetProcessDpiAwareness)))
{
switch (highDpiMode)
{
case HighDpiMode.DpiUnaware:
case HighDpiMode.DpiUnawareGdiScaled:
dpiFlag = NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_DPI_UNAWARE;
break;
case HighDpiMode.SystemAware:
dpiFlag = NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_SYSTEM_DPI_AWARE;
break;
case HighDpiMode.PerMonitor:
case HighDpiMode.PerMonitorV2:
dpiFlag = NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_PER_MONITOR_DPI_AWARE;
break;
default:
dpiFlag = NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_SYSTEM_DPI_AWARE;
break;
}
return(SafeNativeMethods.SetProcessDpiAwareness(dpiFlag) == NativeMethods.S_OK);
}
// For operating systems windows 7 to windows 8
else if (ApiHelper.IsApiAvailable(ExternDll.User32, nameof(SafeNativeMethods.SetProcessDPIAware)))
{
switch (highDpiMode)
{
case HighDpiMode.DpiUnaware:
case HighDpiMode.DpiUnawareGdiScaled:
// We can return, there is nothing to set if we assume we're already in DpiUnaware.
return(true);
case HighDpiMode.SystemAware:
case HighDpiMode.PerMonitor:
case HighDpiMode.PerMonitorV2:
dpiFlag = NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_SYSTEM_DPI_AWARE;
break;
}
if (dpiFlag == NativeMethods.PROCESS_DPI_AWARENESS.PROCESS_SYSTEM_DPI_AWARE)
{
return(SafeNativeMethods.SetProcessDPIAware());
}
}
return(false);
}
/// <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 (ApiHelper.IsApiAvailable(ExternDll.User32, nameof(CommonUnsafeNativeMethods.GetThreadDpiAwarenessContext)))
{
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);
}
}
// For operating systems windows 8.1 to Windows 10 redstone 1 version.
else if (ApiHelper.IsApiAvailable(ExternDll.ShCore, nameof(SafeNativeMethods.GetProcessDpiAwareness)))
{
CAPS.PROCESS_DPI_AWARENESS processDpiAwareness;
SafeNativeMethods.GetProcessDpiAwareness(IntPtr.Zero, out processDpiAwareness);
switch (processDpiAwareness)
{
case CAPS.PROCESS_DPI_AWARENESS.PROCESS_DPI_UNAWARE:
return(HighDpiMode.DpiUnaware);
case CAPS.PROCESS_DPI_AWARENESS.PROCESS_SYSTEM_DPI_AWARE:
return(HighDpiMode.SystemAware);
case CAPS.PROCESS_DPI_AWARENESS.PROCESS_PER_MONITOR_DPI_AWARE:
return(HighDpiMode.PerMonitor);
}
}
// For operating systems windows 7 to windows 8
else if (ApiHelper.IsApiAvailable(ExternDll.User32, nameof(SafeNativeMethods.IsProcessDPIAware)))
{
return(SafeNativeMethods.IsProcessDPIAware() ?
HighDpiMode.SystemAware :
HighDpiMode.DpiUnaware);
}
// We should never get here, except someone ported this with force to < Windows 7.
return(HighDpiMode.DpiUnaware);
}
