Window management

Interop/XRandR.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
+
+namespace Microsoft.Maui.Platform.Linux.Interop;
+
+/// <summary>
+/// XRandR (X Resize and Rotate) extension interop for multi-monitor support.
+/// </summary>
+internal static partial class XRandR
+{
+    private const string LibXrandr = "libXrandr.so.2";
+
+    // RROutput and RRCrtc are XIDs (unsigned long)
+    // RRMode is also an XID
+
+    [LibraryImport(LibXrandr)]
+    public static partial IntPtr XRRGetScreenResources(IntPtr display, IntPtr window);
+
+    [LibraryImport(LibXrandr)]
+    public static partial IntPtr XRRGetScreenResourcesCurrent(IntPtr display, IntPtr window);
+
+    [LibraryImport(LibXrandr)]
+    public static partial void XRRFreeScreenResources(IntPtr resources);
+
+    [LibraryImport(LibXrandr)]
+    public static partial IntPtr XRRGetOutputInfo(IntPtr display, IntPtr resources, ulong output);
+
+    [LibraryImport(LibXrandr)]
+    public static partial void XRRFreeOutputInfo(IntPtr outputInfo);
+
+    [LibraryImport(LibXrandr)]
+    public static partial IntPtr XRRGetCrtcInfo(IntPtr display, IntPtr resources, ulong crtc);
+
+    [LibraryImport(LibXrandr)]
+    public static partial void XRRFreeCrtcInfo(IntPtr crtcInfo);
+
+    [LibraryImport(LibXrandr)]
+    public static partial int XRRQueryExtension(IntPtr display, out int eventBase, out int errorBase);
+
+    [LibraryImport(LibXrandr)]
+    public static partial int XRRQueryVersion(IntPtr display, out int major, out int minor);
+
+    [LibraryImport(LibXrandr)]
+    public static partial void XRRSelectInput(IntPtr display, IntPtr window, int mask);
+
+    // RRNotify mask values
+    public const int RRScreenChangeNotifyMask = 1 << 0;
+    public const int RRCrtcChangeNotifyMask = 1 << 1;
+    public const int RROutputChangeNotifyMask = 1 << 2;
+    public const int RROutputPropertyNotifyMask = 1 << 3;
+
+    // Connection status
+    public const int RR_Connected = 0;
+    public const int RR_Disconnected = 1;
+    public const int RR_UnknownConnection = 2;
+}
+
+/// <summary>
+/// XRRScreenResources structure layout.
+/// </summary>
+[StructLayout(LayoutKind.Sequential)]
+internal struct XRRScreenResources
+{
+    public ulong Timestamp;
+    public ulong ConfigTimestamp;
+    public int NCrtc;
+    public IntPtr Crtcs;        // RRCrtc* (array of ulongs)
+    public int NOutput;
+    public IntPtr Outputs;      // RROutput* (array of ulongs)
+    public int NMode;
+    public IntPtr Modes;        // XRRModeInfo*
+}
+
+/// <summary>
+/// XRROutputInfo structure layout.
+/// </summary>
+[StructLayout(LayoutKind.Sequential)]
+internal struct XRROutputInfo
+{
+    public ulong Timestamp;
+    public ulong Crtc;          // RRCrtc - current CRTC (0 if not connected)
+    public IntPtr Name;         // char*
+    public int NameLen;
+    public ulong MmWidth;       // Physical width in mm
+    public ulong MmHeight;      // Physical height in mm
+    public ushort Connection;   // RRConnection status
+    public ushort SubpixelOrder;
+    public int NCrtc;
+    public IntPtr Crtcs;        // RRCrtc* - possible CRTCs
+    public int NClone;
+    public IntPtr Clones;       // RROutput*
+    public int NMode;
+    public int NPreferred;
+    public IntPtr Modes;        // RRMode*
+}
+
+/// <summary>
+/// XRRCrtcInfo structure layout.
+/// </summary>
+[StructLayout(LayoutKind.Sequential)]
+internal struct XRRCrtcInfo
+{
+    public ulong Timestamp;
+    public int X;
+    public int Y;
+    public uint Width;
+    public uint Height;
+    public ulong Mode;          // RRMode - current mode
+    public ushort Rotation;
+    public int NOutput;
+    public IntPtr Outputs;      // RROutput*
+    public ushort Rotations;    // Possible rotations
+    public int NPossible;
+    public IntPtr Possible;     // RROutput*
+}
+
+/// <summary>
+/// XRRModeInfo structure layout.
+/// </summary>
+[StructLayout(LayoutKind.Sequential)]
+internal struct XRRModeInfo
+{
+    public ulong Id;            // RRMode
+    public uint Width;
+    public uint Height;
+    public ulong DotClock;
+    public uint HSyncStart;
+    public uint HSyncEnd;
+    public uint HTotal;
+    public uint HSkew;
+    public uint VSyncStart;
+    public uint VSyncEnd;
+    public uint VTotal;
+    public IntPtr Name;         // char*
+    public uint NameLength;
+    public ulong ModeFlags;
+}