Get DPI scale for the main display in Windows 11 (24H2). This is useful if you have different DPI scale for different displays and configure VcXsrv and GDK to scale windows correctly in WSL2.

get_dpi_scale.ps1

Add-Type @'
using System;
using System.Runtime.InteropServices;
using System.Drawing;

public class DPI {
  [DllImport("gdi32.dll")]
  static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

  public enum DeviceCap {
    VERTRES = 10,
    DESKTOPVERTRES = 117
  }

  public static float scaling() {
    Graphics g = Graphics.FromHwnd(IntPtr.Zero);
    IntPtr desktop = g.GetHdc();
    int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES);
    int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES);

    return (float)PhysicalScreenHeight / (float)LogicalScreenHeight;
  }
}
'@ -ReferencedAssemblies 'System.Drawing.dll' -ErrorAction Stop

Write-Output ([DPI]::scaling())