Retrieve great hit window from the hit object

osu.Game.Rulesets.Osu/Difficulty/Evaluators/RhythmEvaluator.cs

@@ -18,7 +18,7 @@ public static class RhythmEvaluator
         /// <summary>
         /// Calculates a rhythm multiplier for the difficulty of the tap associated with historic data of the current <see cref="OsuDifficultyHitObject"/>.
         /// </summary>
-        public static double EvaluateDifficultyOf(DifficultyHitObject current, double greatWindow)
+        public static double EvaluateDifficultyOf(DifficultyHitObject current)
         {
             if (current.BaseObject is Spinner)
                 return 0;
@@ -53,7 +53,7 @@ public static double EvaluateDifficultyOf(DifficultyHitObject current, double gr
                 double lastDelta = lastObj.StrainTime;
                 double currRatio = 1.0 + 6.0 * Math.Min(0.5, Math.Pow(Math.Sin(Math.PI / (Math.Min(prevDelta, currDelta) / Math.Max(prevDelta, currDelta))), 2)); // fancy function to calculate rhythmbonuses.
 
-                double windowPenalty = Math.Min(1, Math.Max(0, Math.Abs(prevDelta - currDelta) - greatWindow * 0.6) / (greatWindow * 0.6));
+                double windowPenalty = Math.Min(1, Math.Max(0, Math.Abs(prevDelta - currDelta) - currObj.HitWindowGreat * 0.6) / (currObj.HitWindowGreat * 0.6));
 
                 windowPenalty = Math.Min(1, windowPenalty);
 

osu.Game.Rulesets.Osu/Difficulty/Evaluators/SpeedEvaluator.cs

@@ -24,7 +24,7 @@ public static class SpeedEvaluator
         /// <item><description>and how easily they can be cheesed.</description></item>
         /// </list>
         /// </summary>
-        public static double EvaluateDifficultyOf(DifficultyHitObject current, double greatWindow)
+        public static double EvaluateDifficultyOf(DifficultyHitObject current)
         {
             if (current.BaseObject is Spinner)
                 return 0;
@@ -35,7 +35,6 @@ public static double EvaluateDifficultyOf(DifficultyHitObject current, double gr
             var osuNextObj = (OsuDifficultyHitObject)current.Next(0);
 
             double strainTime = osuCurrObj.StrainTime;
-            double greatWindowFull = greatWindow * 2;
             double doubletapness = 1;
 
             // Nerf doubletappable doubles.
@@ -45,13 +44,13 @@ public static double EvaluateDifficultyOf(DifficultyHitObject current, double gr
                 double nextDeltaTime = Math.Max(1, osuNextObj.DeltaTime);
                 double deltaDifference = Math.Abs(nextDeltaTime - currDeltaTime);
                 double speedRatio = currDeltaTime / Math.Max(currDeltaTime, deltaDifference);
-                double windowRatio = Math.Pow(Math.Min(1, currDeltaTime / greatWindowFull), 2);
+                double windowRatio = Math.Pow(Math.Min(1, currDeltaTime / osuCurrObj.HitWindowGreat), 2);
                 doubletapness = Math.Pow(speedRatio, 1 - windowRatio);
             }
 
             // Cap deltatime to the OD 300 hitwindow.
             // 0.93 is derived from making sure 260bpm OD8 streams aren't nerfed harshly, whilst 0.92 limits the effect of the cap.
-            strainTime /= Math.Clamp((strainTime / greatWindowFull) / 0.93, 0.92, 1);
+            strainTime /= Math.Clamp((strainTime / osuCurrObj.HitWindowGreat) / 0.93, 0.92, 1);
 
             // derive speedBonus for calculation
             double speedBonus = 1.0;

osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs

@@ -23,7 +23,6 @@ namespace osu.Game.Rulesets.Osu.Difficulty
     public class OsuDifficultyCalculator : DifficultyCalculator
     {
         private const double difficulty_multiplier = 0.0675;
-        private double hitWindowGreat;
 
         public override int Version => 20220902;
 
@@ -76,6 +75,11 @@ protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beat
             int sliderCount = beatmap.HitObjects.Count(h => h is Slider);
             int spinnerCount = beatmap.HitObjects.Count(h => h is Spinner);
 
+            HitWindows hitWindows = new OsuHitWindows();
+            hitWindows.SetDifficulty(beatmap.Difficulty.OverallDifficulty);
+
+            double hitWindowGreat = hitWindows.WindowFor(HitResult.Great) / clockRate;
+
             return new OsuDifficultyAttributes
             {
                 StarRating = starRating,
@@ -112,16 +116,11 @@ protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(I
 
         protected override Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods, double clockRate)
         {
-            HitWindows hitWindows = new OsuHitWindows();
-            hitWindows.SetDifficulty(beatmap.Difficulty.OverallDifficulty);
-
-            hitWindowGreat = hitWindows.WindowFor(HitResult.Great) / clockRate;
-
             return new Skill[]
             {
                 new Aim(mods, true),
                 new Aim(mods, false),
-                new Speed(mods, hitWindowGreat),
+                new Speed(mods),
                 new Flashlight(mods)
             };
         }

osu.Game.Rulesets.Osu/Difficulty/Preprocessing/OsuDifficultyHitObject.cs

@@ -9,6 +9,7 @@
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Osu.Mods;
 using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Scoring;
 using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
@@ -78,6 +79,11 @@ public class OsuDifficultyHitObject : DifficultyHitObject
         /// </summary>
         public double? Angle { get; private set; }
 
+        /// <summary>
+        /// Retrieves the full hit window for a Great <see cref="HitResult"/>.
+        /// </summary>
+        public double HitWindowGreat { get; private set; }
+
         private readonly OsuHitObject lastLastObject;
         private readonly OsuHitObject lastObject;
 
@@ -90,6 +96,15 @@ public OsuDifficultyHitObject(HitObject hitObject, HitObject lastObject, HitObje
             // Capped to 25ms to prevent difficulty calculation breaking from simultaneous objects.
             StrainTime = Math.Max(DeltaTime, min_delta_time);
 
+            if (BaseObject is Slider sliderObject)
+            {
+                HitWindowGreat = 2 * sliderObject.HeadCircle.HitWindows.WindowFor(HitResult.Great) / clockRate;
+            }
+            else
+            {
+                HitWindowGreat = 2 * BaseObject.HitWindows.WindowFor(HitResult.Great) / clockRate;
+            }
+
             setDistances(clockRate);
         }
 

osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs

@@ -26,14 +26,12 @@ public class Speed : OsuStrainSkill
 
         protected override int ReducedSectionCount => 5;
         protected override double DifficultyMultiplier => 1.04;
-        private readonly double greatWindow;
 
         private readonly List<double> objectStrains = new List<double>();
 
-        public Speed(Mod[] mods, double hitWindowGreat)
+        public Speed(Mod[] mods)
             : base(mods)
         {
-            greatWindow = hitWindowGreat;
         }
 
         private double strainDecay(double ms) => Math.Pow(strainDecayBase, ms / 1000);
@@ -43,9 +41,9 @@ public Speed(Mod[] mods, double hitWindowGreat)
         protected override double StrainValueAt(DifficultyHitObject current)
         {
             currentStrain *= strainDecay(((OsuDifficultyHitObject)current).StrainTime);
-            currentStrain += SpeedEvaluator.EvaluateDifficultyOf(current, greatWindow) * skillMultiplier;
+            currentStrain += SpeedEvaluator.EvaluateDifficultyOf(current) * skillMultiplier;
 
-            currentRhythm = RhythmEvaluator.EvaluateDifficultyOf(current, greatWindow);
+            currentRhythm = RhythmEvaluator.EvaluateDifficultyOf(current);
 
             double totalStrain = currentStrain * currentRhythm;