Fix mod score multiplier rounding to 1.00x with specific mod combinations

osu.Game.Tests/Mods/ModUtilsTest.cs

@@ -310,6 +310,13 @@ public void TestInvalidFreeModScenarios(Mod[] inputMods, Type[] expectedInvalid)
                 Assert.That(invalid?.Select(t => t.GetType()), Is.EquivalentTo(expectedInvalid));
         }
 
+        [Test]
+        public void TestFormatScoreMultiplier()
+        {
+            Assert.AreEqual(ModUtils.FormatScoreMultiplier(0.9999).ToString(), "0.99x");
+            Assert.AreEqual(ModUtils.FormatScoreMultiplier(1.0001).ToString(), "1.01x");
+        }
+
         public abstract class CustomMod1 : Mod, IModCompatibilitySpecification
         {
         }
@@ -339,6 +346,16 @@ private class InvalidMultiplayerFreeMod : Mod
             public override bool ValidForMultiplayerAsFreeMod => false;
         }
 
+        public class EditableMod : Mod
+        {
+            public override string Name => string.Empty;
+            public override LocalisableString Description => string.Empty;
+            public override string Acronym => string.Empty;
+            public override double ScoreMultiplier => Multiplier;
+
+            public double Multiplier = 1;
+        }
+
         public interface IModCompatibilitySpecification
         {
         }

osu.Game.Tests/Visual/UserInterface/TestSceneFooterButtonMods.cs

@@ -5,10 +5,12 @@
 using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
+using osu.Framework.Localisation;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Mods;
 using osu.Game.Screens.Select;
+using osu.Game.Utils;
 
 namespace osu.Game.Tests.Visual.UserInterface
 {
@@ -74,7 +76,7 @@ private void changeMods(IReadOnlyList<Mod> mods)
         private bool assertModsMultiplier(IEnumerable<Mod> mods)
         {
             double multiplier = mods.Aggregate(1.0, (current, mod) => current * mod.ScoreMultiplier);
-            string expectedValue = multiplier.Equals(1.0) ? string.Empty : $"{multiplier:N2}x";
+            string expectedValue = multiplier == 1 ? string.Empty : ModUtils.FormatScoreMultiplier(multiplier).ToString();
 
             return expectedValue == footerButtonMods.MultiplierText.Current.Value;
         }

osu.Game/Overlays/Mods/ScoreMultiplierDisplay.cs

@@ -4,7 +4,6 @@
 using System;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
-using osu.Framework.Extensions.LocalisationExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
@@ -15,6 +14,7 @@
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Localisation;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Utils;
 using osuTK;
 
 namespace osu.Game.Overlays.Mods
@@ -147,7 +147,7 @@ private partial class EffectCounter : RollingCounter<double>
         {
             protected override double RollingDuration => 500;
 
-            protected override LocalisableString FormatCount(double count) => count.ToLocalisableString(@"0.00x");
+            protected override LocalisableString FormatCount(double count) => ModUtils.FormatScoreMultiplier(count);
 
             protected override OsuSpriteText CreateSpriteText() => new OsuSpriteText
             {

osu.Game/Screens/Select/FooterButtonMods.cs

@@ -19,6 +19,7 @@
 using osuTK;
 using osuTK.Graphics;
 using osu.Game.Input.Bindings;
+using osu.Game.Utils;
 
 namespace osu.Game.Screens.Select
 {
@@ -87,12 +88,11 @@ protected override void LoadComplete()
         private void updateMultiplierText() => Schedule(() =>
         {
             double multiplier = Current.Value?.Aggregate(1.0, (current, mod) => current * mod.ScoreMultiplier) ?? 1;
+            MultiplierText.Text = multiplier == 1 ? string.Empty : ModUtils.FormatScoreMultiplier(multiplier);
 
-            MultiplierText.Text = multiplier.Equals(1.0) ? string.Empty : $"{multiplier:N2}x";
-
-            if (multiplier > 1.0)
+            if (multiplier > 1)
                 MultiplierText.FadeColour(highMultiplierColour, 200);
-            else if (multiplier < 1.0)
+            else if (multiplier < 1)
                 MultiplierText.FadeColour(lowMultiplierColour, 200);
             else
                 MultiplierText.FadeColour(Color4.White, 200);

osu.Game/Utils/ModUtils.cs

@@ -5,6 +5,8 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using osu.Framework.Extensions.LocalisationExtensions;
+using osu.Framework.Localisation;
 using osu.Game.Online.API;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
@@ -226,5 +228,21 @@ public static bool InstantiateValidModsForRuleset(Ruleset ruleset, IEnumerable<A
 
             return proposedWereValid;
         }
+
+        /// <summary>
+        /// Given a value of a score multiplier, returns a string version with special handling for a value near 1.00x.
+        /// </summary>
+        /// <param name="scoreMultiplier">The value of the score multiplier.</param>
+        /// <returns>A formatted score multiplier with a trailing "x" symbol</returns>
+        public static LocalisableString FormatScoreMultiplier(double scoreMultiplier)
+        {
+            // Round multiplier values away from 1.00x to two significant digits.
+            if (scoreMultiplier > 1)
+                scoreMultiplier = Math.Ceiling(scoreMultiplier * 100) / 100;
+            else
+                scoreMultiplier = Math.Floor(scoreMultiplier * 100) / 100;
+
+            return scoreMultiplier.ToLocalisableString("0.00x");
+        }
     }
 }