Renamed HasNewFrame and added RenderTimeCriticalContent for visuals that don't need the time feature all the time.

samples/ControlCatalog/Pages/TimeCriticalRenderPage.cs

@@ -15,7 +15,8 @@ namespace ControlCatalog.Pages
         private TimeSpan _lastFps;
         private int _lastFpsFrame;
         private double _fps;
-        public bool HasNewFrame => true;
+        public bool HasRenderTimeCriticalContent => true;
+        public bool ThreadSafeHasNewFrame => true;
         Stopwatch _st = Stopwatch.StartNew();
 
         private Typeface _typeface = Typeface.Default;

src/Avalonia.Visuals/Rendering/DeferredRenderer.cs

@@ -301,7 +301,7 @@ namespace Avalonia.Rendering
                 }
 
                 var hasCriticalRenderTimeVisualUpdates = Layers.Any(l =>
-                    l.LayerRoot is IRenderTimeCriticalVisual critical && critical.HasNewFrame);
+                    l.LayerRoot is IRenderTimeCriticalVisual critical && critical.ThreadSafeHasNewFrame);
                 if (hasCriticalRenderTimeVisualUpdates)
                 {
                     Layers.Update(scene, contextFactory());
@@ -372,7 +372,7 @@ namespace Avalonia.Rendering
                     var renderTarget = renderLayer.Bitmap;
                     var node = (VisualNode)scene.FindNode(layer.LayerRoot);
                     var critical = node.Visual as IRenderTimeCriticalVisual;
-                    if (criticalTimeRenderOnly && critical?.HasNewFrame != true)
+                    if (criticalTimeRenderOnly && critical?.ThreadSafeHasNewFrame != true)
                         continue;
                     
                     if (node != null)

src/Avalonia.Visuals/Rendering/ImmediateRenderer.cs

@@ -300,7 +300,7 @@ namespace Avalonia.Rendering
                 using (visual.OpacityMask != null ? context.PushOpacityMask(visual.OpacityMask, bounds) : default(DrawingContext.PushedState))
                 using (context.PushTransformContainer())
                 {
-                    if (visual is IRenderTimeCriticalVisual critical)
+                    if (visual is IRenderTimeCriticalVisual critical && critical.HasRenderTimeCriticalContent)
                     {
                         critical.ThreadSafeRender(context, bounds.Size, scaling);
                         info?.RenderTimeCriticalVisuals.Add(critical);
@@ -337,7 +337,7 @@ namespace Avalonia.Rendering
             }
         }
 
-        public bool NeedsUpdate => _lastRenderPassInfo?.RenderTimeCriticalVisuals.Any(v => v.HasNewFrame) == true;
+        public bool NeedsUpdate => _lastRenderPassInfo?.RenderTimeCriticalVisuals.Any(v => v.ThreadSafeHasNewFrame) == true;
         public void Update(TimeSpan time) => _root.InvalidateVisual();
         public void Render()
         {

src/Avalonia.Visuals/Rendering/SceneGraph/SceneBuilder.cs

@@ -368,7 +368,7 @@ namespace Avalonia.Rendering.SceneGraph
 
         private static bool ShouldStartLayer(IVisual visual)
         {
-            if (visual is IRenderTimeCriticalVisual)
+            if (visual is IRenderTimeCriticalVisual critical && critical.HasRenderTimeCriticalContent)
                 return true;
             if (visual.WantsLayer)
                 return true;

src/Avalonia.Visuals/VisualTree/IRenderTimeCriticalVisual.cs

@@ -4,7 +4,8 @@ namespace Avalonia.VisualTree
 {
     public interface IRenderTimeCriticalVisual
     {
-        bool HasNewFrame { get; }
+        bool HasRenderTimeCriticalContent { get; }
+        bool ThreadSafeHasNewFrame { get; }
         void ThreadSafeRender(DrawingContext context, Size logicalSize, double scaling);
     }
 }