From f62a2747f67721cc333ca37c93bb8721287cdd7a Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Fri, 4 Jun 2021 14:51:35 +0900
Subject: [PATCH] Add legacy implementation

---
 .../Skinning/Legacy/KiaiFlashingSprite.cs     | 61 +++++++++++++++++++
 .../Skinning/Legacy/LegacyMainCirclePiece.cs  | 13 ++--
 2 files changed, 67 insertions(+), 7 deletions(-)
 create mode 100644 osu.Game.Rulesets.Osu/Skinning/Legacy/KiaiFlashingSprite.cs

diff --git a/osu.Game.Rulesets.Osu/Skinning/Legacy/KiaiFlashingSprite.cs b/osu.Game.Rulesets.Osu/Skinning/Legacy/KiaiFlashingSprite.cs
new file mode 100644
index 0000000000..4a1d69ad41
--- /dev/null
+++ b/osu.Game.Rulesets.Osu/Skinning/Legacy/KiaiFlashingSprite.cs
@@ -0,0 +1,61 @@
+// 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.Audio.Track;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Textures;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics.Containers;
+
+namespace osu.Game.Rulesets.Osu.Skinning.Legacy
+{
+    internal class KiaiFlashingSprite : BeatSyncedContainer
+    {
+        private readonly Sprite mainSprite;
+        private readonly Sprite flashingSprite;
+
+        public Texture Texture
+        {
+            set
+            {
+                mainSprite.Texture = value;
+                flashingSprite.Texture = value;
+            }
+        }
+
+        private const float flash_opacity = 0.3f;
+
+        public KiaiFlashingSprite()
+        {
+            AutoSizeAxes = Axes.Both;
+
+            Children = new Drawable[]
+            {
+                mainSprite = new Sprite
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                },
+                flashingSprite = new Sprite
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Alpha = 0,
+                    Blending = BlendingParameters.Additive,
+                }
+            };
+        }
+
+        protected override void OnNewBeat(int beatIndex, TimingControlPoint timingPoint, EffectControlPoint effectPoint, ChannelAmplitudes amplitudes)
+        {
+            if (!effectPoint.KiaiMode)
+                return;
+
+            flashingSprite
+                .FadeTo(flash_opacity)
+                .Then()
+                .FadeOut(timingPoint.BeatLength * 0.75f);
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyMainCirclePiece.cs b/osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyMainCirclePiece.cs
index ffbeea5e0e..822dad8523 100644
--- a/osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyMainCirclePiece.cs
+++ b/osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyMainCirclePiece.cs
@@ -5,7 +5,6 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
@@ -32,9 +31,9 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
             Size = new Vector2(OsuHitObject.OBJECT_RADIUS * 2);
         }
 
-        private Container<Sprite> circleSprites;
-        private Sprite hitCircleSprite;
-        private Sprite hitCircleOverlay;
+        private Container circleSprites;
+        private Drawable hitCircleSprite;
+        private Drawable hitCircleOverlay;
 
         private SkinnableSpriteText hitCircleText;
 
@@ -72,20 +71,20 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
 
             InternalChildren = new Drawable[]
             {
-                circleSprites = new Container<Sprite>
+                circleSprites = new Container
                 {
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
                     RelativeSizeAxes = Axes.Both,
                     Children = new[]
                     {
-                        hitCircleSprite = new Sprite
+                        hitCircleSprite = new KiaiFlashingSprite
                         {
                             Texture = baseTexture,
                             Anchor = Anchor.Centre,
                             Origin = Anchor.Centre,
                         },
-                        hitCircleOverlay = new Sprite
+                        hitCircleOverlay = new KiaiFlashingSprite
                         {
                             Texture = overlayTexture,
                             Anchor = Anchor.Centre,