private double GetScaleAdjustment()
{
IntPtr hWnd = WindowNative.GetWindowHandle(this);
WindowId wndId = Win32Interop.GetWindowIdFromWindow(hWnd);
DisplayArea displayArea = DisplayArea.GetFromWindowId(wndId, DisplayAreaFallback.Primary);
IntPtr hMonitor = Win32Interop.GetMonitorFromDisplayId(displayArea.DisplayId);
// Get DPI.
int result = GetDpiForMonitor(hMonitor, Monitor_DPI_Type.MDT_Default, out uint dpiX, out uint _);
if (result != 0)
{
throw new Exception("Could not get DPI for monitor.");
}
uint scaleFactorPercent = (uint)(((long)dpiX * 100 + (96 >> 1)) / 96);
return(scaleFactorPercent / 100.0);
}