Add legacy taiko kiai glow element

osu.Game.Rulesets.Taiko/Skinning/Legacy/LegacyKiaiGlow.cs

@@ -0,0 +1,67 @@
+// 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.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Judgements;
+using osu.Game.Rulesets.Scoring;
+using osu.Game.Skinning;
+using osuTK;
+
+namespace osu.Game.Rulesets.Taiko.Skinning.Legacy
+{
+    internal partial class LegacyKiaiGlow : Container
+    {
+        public LegacyKiaiGlow()
+        {
+            AlwaysPresent = true;
+            Alpha = 0;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(ISkinSource skin)
+        {
+            Child = new Sprite
+            {
+                Texture = skin.GetTexture("taiko-glow"),
+                Origin = Anchor.Centre,
+                Anchor = Anchor.Centre,
+                Scale = new Vector2(0.75f),
+            };
+        }
+
+        [Resolved(CanBeNull = true)]
+        private IBeatSyncProvider? beatSyncProvider { get; set; }
+
+        [Resolved(CanBeNull = true)]
+        private HealthProcessor? healthProcessor { get; set; }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            if (healthProcessor != null)
+                healthProcessor.NewJudgement += onNewJudgement;
+
+            if (beatSyncProvider != null)
+            {
+                if (beatSyncProvider.CheckIsKiaiTime())
+                    this.FadeIn(180);
+                else
+                    this.FadeOut(180);
+            }
+        }
+
+        private void onNewJudgement(JudgementResult result)
+        {
+            if (!result.IsHit)
+                return;
+
+            this.ScaleTo(1.1f, 50)
+                .Then().ScaleTo(1f, 50);
+        }
+    }
+}

osu.Game.Rulesets.Taiko/Skinning/Legacy/TaikoLegacySkinTransformer.cs

@@ -129,6 +129,12 @@ namespace osu.Game.Rulesets.Taiko.Skinning.Legacy
                     case TaikoSkinComponents.Mascot:
                         return new DrawableTaikoMascot();
 
+                    case TaikoSkinComponents.KiaiGlow:
+                        if (GetTexture("taiko-glow") != null)
+                            return new LegacyKiaiGlow();
+
+                        return null;
+
                     default:
                         throw new UnsupportedSkinComponentException(lookup);
                 }

osu.Game.Rulesets.Taiko/TaikoSkinComponents.cs

@@ -21,5 +21,6 @@ namespace osu.Game.Rulesets.Taiko
         TaikoExplosionKiai,
         Scroller,
         Mascot,
+        KiaiGlow
     }
 }

osu.Game.Rulesets.Taiko/UI/TaikoPlayfield.cs

@@ -112,6 +112,10 @@ namespace osu.Game.Rulesets.Taiko.UI
                             FillMode = FillMode.Fit,
                             Children = new[]
                             {
+                                new SkinnableDrawable(new TaikoSkinComponentLookup(TaikoSkinComponents.KiaiGlow), _ => Empty())
+                                {
+                                    RelativeSizeAxes = Axes.Both,
+                                },
                                 hitExplosionContainer = new Container<HitExplosion>
                                 {
                                     RelativeSizeAxes = Axes.Both,