1 files changed, 76 insertions, 0 deletions
diff --git a/Ryujinx.Ava/Ui/Backend/BackendSurface.cs b/Ryujinx.Ava/Ui/Backend/BackendSurface.cs
new file mode 100644
index 00000000..423fe038
--- /dev/null
+++ b/Ryujinx.Ava/Ui/Backend/BackendSurface.cs
@@ -0,0 +1,76 @@
+using Avalonia;
+using System;
+using System.Runtime.InteropServices;
+using static Ryujinx.Ava.Ui.Backend.Interop;
+
+namespace Ryujinx.Ava.Ui.Backend
+{
+    public abstract class BackendSurface : IDisposable
+    {
+        protected IntPtr Display => _display;
+
+        private IntPtr _display = IntPtr.Zero;
+
+        [DllImport("libX11.so.6")]
+        public static extern IntPtr XOpenDisplay(IntPtr display);
+
+        [DllImport("libX11.so.6")]
+        public static extern int XCloseDisplay(IntPtr display);
+
+        private PixelSize _currentSize;
+        public IntPtr Handle { get; protected set; }
+
+        public bool IsDisposed { get; private set; }
+
+        public BackendSurface(IntPtr handle)
+        {
+            Handle = handle;
+
+            if (OperatingSystem.IsLinux())
+            {
+                _display = XOpenDisplay(IntPtr.Zero);
+            }
+        }
+
+        public PixelSize Size
+        {
+            get
+            {
+                PixelSize size = new PixelSize();
+                if (OperatingSystem.IsWindows())
+                {
+                    GetClientRect(Handle, out var rect);
+                    size = new PixelSize(rect.right, rect.bottom);
+                }
+                else if (OperatingSystem.IsLinux())
+                {
+                    XWindowAttributes attributes = new XWindowAttributes();
+                    XGetWindowAttributes(Display, Handle, ref attributes);
+
+                    size = new PixelSize(attributes.width, attributes.height);
+                }
+
+                _currentSize = size;
+
+                return size;
+            }
+        }
+
+        public PixelSize CurrentSize => _currentSize;
+
+        public virtual void Dispose()
+        {
+            if (IsDisposed)
+            {
+                throw new ObjectDisposedException(nameof(BackendSurface));
+            }
+
+            IsDisposed = true;
+
+            if (_display != IntPtr.Zero)
+            {
+                XCloseDisplay(_display);
+            }
+        }
+    }
+}
+\ No newline at end of file