add MatchScoreDiffCounter

Intuitively show the score difference between the two teams

osu.Game.Tournament/Screens/Gameplay/Components/TournamentMatchScoreDisplay.cs

@@ -28,6 +28,8 @@ namespace osu.Game.Tournament.Screens.Gameplay.Components
         private readonly MatchScoreCounter score1Text;
         private readonly MatchScoreCounter score2Text;
 
+        private readonly MatchScoreDiffCounter scoreDiffText;
+
         private readonly Drawable score1Bar;
         private readonly Drawable score2Bar;
 
@@ -88,6 +90,11 @@ namespace osu.Game.Tournament.Screens.Gameplay.Components
                     Anchor = Anchor.TopCentre,
                     Origin = Anchor.TopCentre
                 },
+                scoreDiffText = new MatchScoreDiffCounter
+                {
+                    Anchor = Anchor.TopCentre,
+                    Alpha = 0
+                }
             };
         }
 
@@ -119,6 +126,16 @@ namespace osu.Game.Tournament.Screens.Gameplay.Components
 
             losingBar.ResizeWidthTo(0, 400, Easing.OutQuint);
             winningBar.ResizeWidthTo(Math.Min(0.4f, MathF.Pow(diff / 1500000f, 0.5f) / 2), 400, Easing.OutQuint);
+
+            if (diff == 0)
+            {
+                scoreDiffText.Hide();
+                return;
+            }
+
+            scoreDiffText.Show();
+            scoreDiffText.Current.Value = -diff;
+            scoreDiffText.Origin = score1.Value > score2.Value ? Anchor.TopLeft : Anchor.TopRight;
         }
 
         protected override void UpdateAfterChildren()
@@ -154,5 +171,19 @@ namespace osu.Game.Tournament.Screens.Gameplay.Components
                     ? OsuFont.Torus.With(weight: FontWeight.Bold, size: 50, fixedWidth: true)
                     : OsuFont.Torus.With(weight: FontWeight.Regular, size: 40, fixedWidth: true);
         }
+
+        private partial class MatchScoreDiffCounter : CommaSeparatedScoreCounter
+        {
+            public MatchScoreDiffCounter()
+            {
+                Margin = new MarginPadding { Top = bar_height / 4, Horizontal = 10 };
+            }
+
+            protected override OsuSpriteText CreateSpriteText() => base.CreateSpriteText().With(s =>
+            {
+                s.Spacing = new Vector2(-1);
+                s.Font = OsuFont.Torus.With(weight: FontWeight.Regular, size: bar_height, fixedWidth: true);
+            });
+        }
     }
 }