Rewrite circle pieces to use custom graphics again.

Also using FontAwesome for now to enforce the same size, because otherwise you have to mess around with sprites + the custom graphics. This will all be changed when sprites are fixed to maintain aspect ratios and when glow/border use relative axes.

osu.Desktop.VisualTests/Tests/TestCaseTaikoHitObjects.cs

@@ -2,10 +2,15 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using OpenTK;
+using OpenTK.Graphics;
 using osu.Framework.Allocation;
+using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Textures;
 using osu.Framework.Screens.Testing;
 using osu.Game.Graphics;
+using osu.Game.Modes.Taiko.Objects;
 using osu.Game.Modes.Taiko.Objects.Drawable.Pieces;
 
 namespace osu.Desktop.VisualTests.Tests
@@ -26,7 +31,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Reset();
             });
 
-            Add(new CentreHitCircle(new CirclePiece(@"centre")
+            Add(new CentreHitCircle(new CirclePiece()
             {
                 KiaiMode = kiai
             })
@@ -34,7 +39,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(100, 100)
             });
 
-            Add(new CentreHitCircle(new AccentedCirclePiece(@"centre")
+            Add(new CentreHitCircle(new AccentedCirclePiece()
             {
                 KiaiMode = kiai
             })
@@ -42,7 +47,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(350, 100)
             });
 
-            Add(new RimHitCircle(new CirclePiece(@"rim")
+            Add(new RimHitCircle(new CirclePiece()
             {
                 KiaiMode = kiai
             })
@@ -50,7 +55,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(100, 300)
             });
 
-            Add(new RimHitCircle(new AccentedCirclePiece(@"rim")
+            Add(new RimHitCircle(new AccentedCirclePiece()
             {
                 KiaiMode = kiai
             })
@@ -58,7 +63,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(350, 300)
             });
 
-            Add(new SwellCircle(new CirclePiece(@"swell")
+            Add(new SwellCircle(new CirclePiece()
             {
                 KiaiMode = kiai
             })
@@ -66,7 +71,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(100, 500)
             });
 
-            Add(new SwellCircle(new AccentedCirclePiece(@"swell")
+            Add(new SwellCircle(new AccentedCirclePiece()
             {
                 KiaiMode = kiai
             })
@@ -74,7 +79,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(350, 500)
             });
 
-            Add(new DrumRollCircle(new CirclePiece(string.Empty)
+            Add(new DrumRollCircle(new CirclePiece()
             {
                 Width = 250,
                 KiaiMode = kiai
@@ -83,7 +88,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Position = new Vector2(575, 100)
             });
 
-            Add(new DrumRollCircle(new AccentedCirclePiece(string.Empty)
+            Add(new DrumRollCircle(new AccentedCirclePiece()
             {
                 Width = 250,
                 KiaiMode = kiai
@@ -95,13 +100,22 @@ namespace osu.Desktop.VisualTests.Tests
 
         private class SwellCircle : BaseCircle
         {
+            private const float symbol_size = TaikoHitObject.CIRCLE_RADIUS * 2f * 0.35f;
+
             public SwellCircle(CirclePiece piece)
                 : base(piece)
             {
+                Piece.Add(new TextAwesome
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    TextSize = symbol_size,
+                    Shadow = false
+                });
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours)
+            private void load(OsuColour colours, TextureStore textures)
             {
                 Piece.AccentColour = colours.YellowDark;
             }
@@ -123,9 +137,25 @@ namespace osu.Desktop.VisualTests.Tests
 
         private class CentreHitCircle : BaseCircle
         {
+            private const float symbol_size = TaikoHitObject.CIRCLE_RADIUS * 2f * 0.35f;
+
             public CentreHitCircle(CirclePiece piece)
                 : base(piece)
             {
+                Piece.Add(new CircularContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(symbol_size),
+                    Masking = true,
+                    Children = new[]
+                    {
+                        new Box
+                        {
+                            RelativeSizeAxes = Axes.Both
+                        }
+                    }
+                });
             }
 
             [BackgroundDependencyLoader]
@@ -137,9 +167,29 @@ namespace osu.Desktop.VisualTests.Tests
 
         private class RimHitCircle : BaseCircle
         {
+            private const float symbol_size = TaikoHitObject.CIRCLE_RADIUS * 2f * 0.45f;
+
             public RimHitCircle(CirclePiece piece)
                 : base(piece)
             {
+                Piece.Add(new CircularContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(symbol_size),
+                    BorderThickness = 8,
+                    BorderColour = Color4.White,
+                    Masking = true,
+                    Children = new[]
+                    {
+                        new Box
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Alpha = 0,
+                            AlwaysPresent = true
+                        }
+                    }
+                });
             }
 
             [BackgroundDependencyLoader]

osu.Game.Modes.Taiko/Objects/Drawable/Pieces/AccentedCirclePiece.cs

@@ -15,9 +15,9 @@ namespace osu.Game.Modes.Taiko.Objects.Drawable.Pieces
         /// </summary>
         private const float accent_scale = 1.5f;
 
-        public AccentedCirclePiece(string symbolName)
+        public AccentedCirclePiece()
-            : base(symbolName)
         {
+            SymbolContainer.Scale = new Vector2(accent_scale);
         }
 
         public override Vector2 Size => new Vector2(base.Size.X, base.Size.Y * accent_scale);

osu.Game.Modes.Taiko/Objects/Drawable/Pieces/CirclePiece.cs

@@ -7,8 +7,6 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
 using osu.Game.Graphics.Backgrounds;
 using OpenTK.Graphics;
-using osu.Framework.Graphics.Textures;
-using osu.Framework.Allocation;
 using System;
 
 namespace osu.Game.Modes.Taiko.Objects.Drawable.Pieces
@@ -63,18 +61,16 @@ namespace osu.Game.Modes.Taiko.Objects.Drawable.Pieces
             set { throw new InvalidOperationException($"{nameof(CirclePiece)} must always use CentreLeft origin."); }
         }
 
+        protected override Container<Framework.Graphics.Drawable> Content => SymbolContainer;
+        protected readonly Container SymbolContainer;
+
         private readonly Container innerLayer;
         private readonly Container innerCircleContainer;
         private readonly Box innerBackground;
         private readonly Triangles triangles;
-        private readonly Sprite symbol;
 
-        private readonly string symbolName;
+        public CirclePiece()
-
-        public CirclePiece(string symbolName)
         {
-            this.symbolName = symbolName;
-
             Height = TaikoHitObject.CIRCLE_RADIUS * 2;
 
             // The "inner layer" is the body of the CirclePiece that overshoots it by Height/2 px on both sides
@@ -130,24 +126,16 @@ namespace osu.Game.Modes.Taiko.Objects.Drawable.Pieces
                             }
                         }
                     },
-                    symbol = new Sprite
+                    SymbolContainer = new Container
                     {
                         Name = "Symbol",
                         Anchor = Anchor.Centre,
                         Origin = Anchor.Centre,
-                        RelativeSizeAxes = Axes.Both
                     }
                 }
             });
         }
 
-        [BackgroundDependencyLoader]
-        private void load(TextureStore textures)
-        {
-            if (!string.IsNullOrEmpty(symbolName))
-                symbol.Texture = textures.Get($@"Play/Taiko/{symbolName}-symbol");
-        }
-
         protected override void Update()
         {
             // Add the overshoot to compensate for corner radius