Implement IApplicableToHUD

osu.Game/Rulesets/Mods/IApplicableToHUD.cs

@@ -0,0 +1,18 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Screens.Play;
+
+namespace osu.Game.Rulesets.Mods
+{
+    /// <summary>
+    /// An interface for mods that apply changes to the <see cref="HUDOverlay"/>.
+    /// </summary>
+    public interface IApplicableToHUD : IApplicableMod
+    {
+        /// <summary>
+        /// Provide a <see cref="HUDOverlay"/>. Called once on initialisation of a play instance.
+        /// </summary>
+        void ApplyToHUD(HUDOverlay overlay);
+    }
+}

osu.Game/Screens/Play/Player.cs

@@ -494,6 +494,9 @@ namespace osu.Game.Screens.Play
 
             GameplayClockContainer.Restart();
             GameplayClockContainer.FadeInFromZero(750, Easing.OutQuint);
+
+            foreach (var mod in Mods.Value.OfType<IApplicableToHUD>())
+                mod.ApplyToHUD(HUDOverlay);
         }
 
         public override void OnSuspending(IScreen next)