Fix legacy approach circles accepting alpha

osu.Game.Rulesets.Osu.Tests/TestSceneSkinFallbacks.cs

@@ -20,6 +20,7 @@ using osu.Game.Configuration;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Rulesets.Osu.Skinning.Default;
 using osu.Game.Skinning;
 using osu.Game.Storyboards;
 using osu.Game.Tests.Visual;
@@ -86,9 +87,9 @@ namespace osu.Game.Rulesets.Osu.Tests
                 if (firstObject == null)
                     return false;
 
-                var skinnable = firstObject.ApproachCircle.Child as SkinnableDrawable;
+                var skinnable = firstObject.ApproachCircle;
 
-                if (skin == null && skinnable?.Drawable is Sprite)
+                if (skin == null && skinnable?.Drawable is DefaultApproachCircle)
                     // check for default skin provider
                     return true;
 

osu.Game.Rulesets.Osu/Objects/Drawables/DrawableHitCircle.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
         public OsuAction? HitAction => HitArea.HitAction;
         protected virtual OsuSkinComponents CirclePieceComponent => OsuSkinComponents.HitCircle;
 
-        public ApproachCircle ApproachCircle { get; private set; }
+        public SkinnableDrawable ApproachCircle { get; private set; }
         public HitReceptor HitArea { get; private set; }
         public SkinnableDrawable CirclePiece { get; private set; }
 
@@ -74,8 +74,11 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
                             Anchor = Anchor.Centre,
                             Origin = Anchor.Centre,
                         },
-                        ApproachCircle = new ApproachCircle
+                        ApproachCircle = new ProxyableSkinnableDrawable(new OsuSkinComponent(OsuSkinComponents.ApproachCircle), _ => new DefaultApproachCircle())
                         {
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            RelativeSizeAxes = Axes.Both,
                             Alpha = 0,
                             Scale = new Vector2(4),
                         }
@@ -88,7 +91,6 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             PositionBindable.BindValueChanged(_ => Position = HitObject.StackedPosition);
             StackHeightBindable.BindValueChanged(_ => Position = HitObject.StackedPosition);
             ScaleBindable.BindValueChanged(scale => scaleContainer.Scale = new Vector2(scale.NewValue));
-            AccentColour.BindValueChanged(accent => ApproachCircle.Colour = accent.NewValue);
         }
 
         protected override void LoadComplete()
@@ -250,5 +252,15 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             {
             }
         }
+
+        private class ProxyableSkinnableDrawable : SkinnableDrawable
+        {
+            public override bool RemoveWhenNotAlive => false;
+
+            public ProxyableSkinnableDrawable(ISkinComponent component, Func<ISkinComponent, Drawable> defaultImplementation = null, ConfineMode confineMode = ConfineMode.NoScaling)
+                : base(component, defaultImplementation, confineMode)
+            {
+            }
+        }
     }
 }

osu.Game.Rulesets.Osu/OsuSkinComponents.cs

@@ -18,5 +18,6 @@ namespace osu.Game.Rulesets.Osu
         SliderBall,
         SliderBody,
         SpinnerBody,
+        ApproachCircle,
     }
 }

osu.Game.Rulesets.Osu/Skinning/Default/ApproachCircle.cs

@@ -1,50 +0,0 @@
-// 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.Textures;
-using osu.Game.Skinning;
-using osuTK;
-
-namespace osu.Game.Rulesets.Osu.Skinning.Default
-{
-    public class ApproachCircle : Container
-    {
-        public override bool RemoveWhenNotAlive => false;
-
-        public ApproachCircle()
-        {
-            Anchor = Anchor.Centre;
-            Origin = Anchor.Centre;
-
-            RelativeSizeAxes = Axes.Both;
-        }
-
-        [BackgroundDependencyLoader]
-        private void load(TextureStore textures)
-        {
-            Child = new SkinnableApproachCircle();
-        }
-
-        private class SkinnableApproachCircle : SkinnableSprite
-        {
-            public SkinnableApproachCircle()
-                : base("Gameplay/osu/approachcircle")
-            {
-            }
-
-            protected override Drawable CreateDefault(ISkinComponent component)
-            {
-                var drawable = base.CreateDefault(component);
-
-                // account for the sprite being used for the default approach circle being taken from stable,
-                // when hitcircles have 5px padding on each size. this should be removed if we update the sprite.
-                drawable.Scale = new Vector2(128 / 118f);
-
-                return drawable;
-            }
-        }
-    }
-}

osu.Game.Rulesets.Osu/Skinning/Default/DefaultApproachCircle.cs

@@ -0,0 +1,49 @@
+// 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.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Skinning;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Osu.Skinning.Default
+{
+    public class DefaultApproachCircle : SkinnableSprite
+    {
+        private readonly IBindable<Color4> accentColour = new Bindable<Color4>();
+
+        [Resolved]
+        private DrawableHitObject drawableObject { get; set; }
+
+        public DefaultApproachCircle()
+            : base("Gameplay/osu/approachcircle")
+        {
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            accentColour.BindTo(drawableObject.AccentColour);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            accentColour.BindValueChanged(colour => Colour = colour.NewValue, true);
+        }
+
+        protected override Drawable CreateDefault(ISkinComponent component)
+        {
+            var drawable = base.CreateDefault(component);
+
+            // Although this is a non-legacy component, osu-resources currently stores approach circle as a legacy-like texture.
+            // See LegacyApproachCircle for documentation as to why this is required.
+            drawable.Scale = new Vector2(128 / 118f);
+
+            return drawable;
+        }
+    }
+}

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyApproachCircle.cs

@@ -0,0 +1,49 @@
+// 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.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Skinning;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Osu.Skinning.Legacy
+{
+    public class LegacyApproachCircle : SkinnableSprite
+    {
+        private readonly IBindable<Color4> accentColour = new Bindable<Color4>();
+
+        [Resolved]
+        private DrawableHitObject drawableObject { get; set; }
+
+        public LegacyApproachCircle()
+            : base("approachcircle")
+        {
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            accentColour.BindTo(drawableObject.AccentColour);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            accentColour.BindValueChanged(colour => Colour = LegacyColourCompatibility.DisallowZeroAlpha(colour.NewValue), true);
+        }
+
+        protected override Drawable CreateDefault(ISkinComponent component)
+        {
+            var drawable = base.CreateDefault(component);
+
+            // account for the sprite being used for the default approach circle being taken from stable,
+            // when hitcircles have 5px padding on each size. this should be removed if we update the sprite.
+            drawable.Scale = new Vector2(128 / 118f);
+
+            return drawable;
+        }
+    }
+}

osu.Game.Rulesets.Osu/Skinning/Legacy/OsuLegacySkinTransformer.cs

@@ -108,6 +108,9 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
                             return new LegacyOldStyleSpinner();
 
                         return null;
+
+                    case OsuSkinComponents.ApproachCircle:
+                        return new LegacyApproachCircle();
                 }
             }