Add ThreadProxyRenderTimer (#12900)

* Add ThreadProxyRenderTimer

* Forgot IsBackground

* Increase default stack size in ThreadProxyRenderTimer

src/Avalonia.Base/Rendering/ThreadProxyRenderTimer.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Diagnostics;
+using System.Threading;
+using Avalonia.Metadata;
+
+namespace Avalonia.Rendering;
+
+[PrivateApi]
+public sealed class ThreadProxyRenderTimer : IRenderTimer
+{
+    private readonly IRenderTimer _inner;
+    private readonly Stopwatch _stopwatch;
+    private readonly Thread _timerThread;
+    private readonly AutoResetEvent _autoResetEvent;
+    private Action<TimeSpan>? _tick;
+    private int _subscriberCount;
+    private bool _registered;
+
+    public ThreadProxyRenderTimer(IRenderTimer inner, int maxStackSize = 1 * 1024 * 1024)
+    {
+        _inner = inner;
+        _stopwatch = new Stopwatch();
+        _autoResetEvent = new AutoResetEvent(false);
+        _timerThread = new Thread(RenderTimerThreadFunc, maxStackSize) { Name = "RenderTimerLoop", IsBackground = true };
+    }
+
+    public event Action<TimeSpan> Tick
+    {
+        add
+        {
+            _tick += value;
+
+            if (!_registered)
+            {
+                _registered = true;
+                _timerThread.Start();
+            }
+
+            if (_subscriberCount++ == 0)
+            {
+                _inner.Tick += InnerTick;
+            }
+        }
+
+        remove
+        {
+            if (--_subscriberCount == 0)
+            {
+                _inner.Tick -= InnerTick;
+            }
+
+            _tick -= value;
+        }
+    }
+
+    private void RenderTimerThreadFunc()
+    {
+        while (_autoResetEvent.WaitOne())
+        {
+            _tick?.Invoke(_stopwatch.Elapsed);
+        }
+    }
+
+    private void InnerTick(TimeSpan obj)
+    {
+        _autoResetEvent.Set();
+    }
+
+    public bool RunsInBackground => true;
+}

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -108,7 +108,7 @@ void DoInitialize(AvaloniaNativePlatformOptions options)
                 .Bind<IPlatformSettings>().ToConstant(new NativePlatformSettings(_factory.CreatePlatformSettings()))
                 .Bind<IWindowingPlatform>().ToConstant(this)
                 .Bind<IClipboard>().ToConstant(new ClipboardImpl(_factory.CreateClipboard()))
-                .Bind<IRenderTimer>().ToConstant(new AvaloniaNativeRenderTimer(_factory.CreatePlatformRenderTimer()))
+                .Bind<IRenderTimer>().ToConstant(new ThreadProxyRenderTimer(new AvaloniaNativeRenderTimer(_factory.CreatePlatformRenderTimer())))
                 .Bind<IMountedVolumeInfoProvider>().ToConstant(new MacOSMountedVolumeInfoProvider())
                 .Bind<IPlatformDragSource>().ToConstant(new AvaloniaNativeDragSource(_factory))
                 .Bind<IPlatformLifetimeEventsImpl>().ToConstant(applicationPlatform)