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using Ryujinx.Common.Logging;
using System;
using System.Globalization;
using System.Runtime.InteropServices;
namespace Ryujinx.Common.SystemInterop
{
public static partial class ForceDpiAware
{
[LibraryImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static partial bool SetProcessDPIAware();
private const string X11LibraryName = "libX11.so.6";
[LibraryImport(X11LibraryName)]
private static partial IntPtr XOpenDisplay([MarshalAs(UnmanagedType.LPStr)] string display);
[LibraryImport(X11LibraryName)]
private static partial IntPtr XGetDefault(IntPtr display, [MarshalAs(UnmanagedType.LPStr)] string program, [MarshalAs(UnmanagedType.LPStr)] string option);
[LibraryImport(X11LibraryName)]
private static partial int XDisplayWidth(IntPtr display, int screenNumber);
[LibraryImport(X11LibraryName)]
private static partial int XDisplayWidthMM(IntPtr display, int screenNumber);
[LibraryImport(X11LibraryName)]
private static partial int XCloseDisplay(IntPtr display);
private const double StandardDpiScale = 96.0;
private const double MaxScaleFactor = 1.25;
/// <summary>
/// Marks the application as DPI-Aware when running on the Windows operating system.
/// </summary>
public static void Windows()
{
// Make process DPI aware for proper window sizing on high-res screens.
if (OperatingSystem.IsWindowsVersionAtLeast(6))
{
SetProcessDPIAware();
}
}
public static double GetActualScaleFactor()
{
double userDpiScale = 96.0;
try
{
if (OperatingSystem.IsWindows())
{
userDpiScale = GdiPlusHelper.GetDpiX(IntPtr.Zero);
}
else if (OperatingSystem.IsLinux())
{
string xdgSessionType = Environment.GetEnvironmentVariable("XDG_SESSION_TYPE")?.ToLower();
if (xdgSessionType == null || xdgSessionType == "x11")
{
IntPtr display = XOpenDisplay(null);
string dpiString = Marshal.PtrToStringAnsi(XGetDefault(display, "Xft", "dpi"));
if (dpiString == null || !double.TryParse(dpiString, NumberStyles.Any, CultureInfo.InvariantCulture, out userDpiScale))
{
userDpiScale = XDisplayWidth(display, 0) * 25.4 / XDisplayWidthMM(display, 0);
}
_ = XCloseDisplay(display);
}
else if (xdgSessionType == "wayland")
{
// TODO
Logger.Warning?.Print(LogClass.Application, "Couldn't determine monitor DPI: Wayland not yet supported");
}
else
{
Logger.Warning?.Print(LogClass.Application, $"Couldn't determine monitor DPI: Unrecognised XDG_SESSION_TYPE: {xdgSessionType}");
}
}
}
catch (Exception e)
{
Logger.Warning?.Print(LogClass.Application, $"Couldn't determine monitor DPI: {e.Message}");
}
return userDpiScale;
}
public static double GetWindowScaleFactor()
{
double userDpiScale = GetActualScaleFactor();
return Math.Min(userDpiScale / StandardDpiScale, MaxScaleFactor);
}
}
}
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