static DpiHelper()
{
if (DpiHelperMethods.IsSupported)
{
DpiMethods.SetProcessDpiAwareness(DpiMethods.ProcessDpiAwareness.DpiHelperAware);
}
}
/// <summary>
/// モニターごとのDPI情報を取得する
/// </summary>
/// <param name="mon">モニタハンドル</param>
/// <returns>DpiScale</returns>
internal static DpiScale GetDpiForMonitor(IntPtr mon)
{
uint dpiX = 96;
uint dpiY = 96;
if (null != mon && DpiHelperMethods.IsSupported)
{
DpiMethods.GetDpiForMonitor(mon, MonitorDpiType.Default, ref dpiX, ref dpiY);
}
return(new DpiScale(dpiX / 96.0, dpiY / 96.0));
}
public static Dpi GetDpi(this HwndSource hwndSource, MonitorDpiType dpiType = MonitorDpiType.Default)
{
if (!IsSupported)
{
return(Dpi.Default);
}
var hMonitor = DpiMethods.MonitorFromWindow(hwndSource.Handle, DpiMethods.MonitorDefaultTo.Nearest);
uint dpiX = 1, dpiY = 1;
DpiMethods.GetDpiForMonitor(hMonitor, dpiType, ref dpiX, ref dpiY);
return(new Dpi(dpiX, dpiY));
}
/// <summary>
/// DPIスケールを取得する
/// </summary>
/// <param name="hwnd">ウィンドウハンドル</param>
/// <returns>スケール</returns>
public static float GetDisplayScaleFactor(IntPtr hwnd)
{
return((float)GetDpiForMonitor(DpiMethods.MonitorFromWindow(hwnd, DpiMethods.MonitorDefaultTo.Nearest)).DpiScaleX);
}
/// <summary>
/// 指定スクリーンにおけるDPI情報を取得する
/// </summary>
/// <param name="screen">スクリーン</param>
/// <returns>DpiScale</returns>
public static DpiScale GetDpi(System.Windows.Forms.Screen screen)
{
var point = new System.Drawing.Point(screen.Bounds.Left + 1, screen.Bounds.Top + 1);
return(GetDpiForMonitor(DpiMethods.MonitorFromPoint(point, DpiMethods.MonitorDefaultTo.Nearest)));
}