Crop and disable mipmaps on beatmap panel backgrounds

This is an effort to improve general performance at song select. At
least on the metal renderer, I can notice very high draw frame overheads
related to texture uploads.

By reducing the size of the texture uploads to roughly match what is
actually being displayed on screen (using a relatively inexpensive crop
operation), we can bastly reduce stuttering both during initial load and
carousel scroll.

You might ask if it's safe to disable mipmapping, but I've tested with
lower resolutions and bilinear filtering seems to handle just fine.
Bilinear without mipmaps only falls apart when you scale below 50% and
we're not going too far past that at minimum game scale, if at all.

osu.Game/Beatmaps/BeatmapPanelBackgroundTextureLoaderStore.cs

@@ -0,0 +1,88 @@
+// 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 System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.IO.Stores;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Processing;
+
+namespace osu.Game.Beatmaps
+{
+    // Implementation of this class is based off of `MaxDimensionLimitedTextureLoaderStore`.
+    // If issues are found it's worth checking to make sure similar issues exist there.
+    public class BeatmapPanelBackgroundTextureLoaderStore : IResourceStore<TextureUpload>
+    {
+        // These numbers are taken from the draw visualiser size requirements for song select panel textures at extreme aspect ratios.
+        private const int height = 130;
+        private const int max_width = 1280;
+
+        private readonly IResourceStore<TextureUpload>? textureStore;
+
+        public BeatmapPanelBackgroundTextureLoaderStore(IResourceStore<TextureUpload>? textureStore)
+        {
+            this.textureStore = textureStore;
+        }
+
+        public void Dispose()
+        {
+            textureStore?.Dispose();
+        }
+
+        public TextureUpload Get(string name)
+        {
+            var textureUpload = textureStore?.Get(name);
+
+            // NRT not enabled on framework side classes (IResourceStore / TextureLoaderStore), welp.
+            if (textureUpload == null)
+                return null!;
+
+            return limitTextureUploadSize(textureUpload);
+        }
+
+        public async Task<TextureUpload> GetAsync(string name, CancellationToken cancellationToken = new CancellationToken())
+        {
+            // NRT not enabled on framework side classes (IResourceStore / TextureLoaderStore), welp.
+            if (textureStore == null)
+                return null!;
+
+            var textureUpload = await textureStore.GetAsync(name, cancellationToken).ConfigureAwait(false);
+
+            if (textureUpload == null)
+                return null!;
+
+            return await Task.Run(() => limitTextureUploadSize(textureUpload), cancellationToken).ConfigureAwait(false);
+        }
+
+        private TextureUpload limitTextureUploadSize(TextureUpload textureUpload)
+        {
+            var image = Image.LoadPixelData(textureUpload.Data.ToArray(), textureUpload.Width, textureUpload.Height);
+
+            // The original texture upload will no longer be returned or used.
+            textureUpload.Dispose();
+
+            Size size = image.Size();
+            int usableWidth = Math.Min(max_width, size.Width);
+
+            // Crop the centre region of the background for now.
+            Rectangle cropRectangle = new Rectangle(
+                (size.Width - usableWidth) / 2,
+                size.Height / 2 - height / 2,
+                usableWidth,
+                height
+            );
+
+            image.Mutate(i => i.Crop(cropRectangle));
+
+            return new TextureUpload(image);
+        }
+
+        public Stream? GetStream(string name) => textureStore?.GetStream(name);
+
+        public IEnumerable<string> GetAvailableResources() => textureStore?.GetAvailableResources() ?? Array.Empty<string>();
+    }
+}

osu.Game/Beatmaps/IBeatmapResourceProvider.cs

@@ -16,6 +16,11 @@ namespace osu.Game.Beatmaps
         /// </summary>
         TextureStore LargeTextureStore { get; }
 
+        /// <summary>
+        /// Retrieve a global large texture store, used specifically for retrieving cropped beatmap panel backgrounds.
+        /// </summary>
+        TextureStore BeatmapPanelTextureStore { get; }
+
         /// <summary>
         /// Access a global track store for retrieving beatmap tracks from.
         /// </summary>

osu.Game/Beatmaps/IWorkingBeatmap.cs

@@ -49,6 +49,11 @@ namespace osu.Game.Beatmaps
         /// </summary>
         Texture GetBackground();
 
+        /// <summary>
+        /// Retrieves a cropped background for this <see cref="IWorkingBeatmap"/> used for display on panels.
+        /// </summary>
+        Texture GetPanelBackground();
+
         /// <summary>
         /// Retrieves the <see cref="Waveform"/> for the <see cref="Track"/> of this <see cref="IWorkingBeatmap"/>.
         /// </summary>

osu.Game/Beatmaps/WorkingBeatmap.cs

@@ -66,6 +66,7 @@ namespace osu.Game.Beatmaps
 
         protected abstract IBeatmap GetBeatmap();
         public abstract Texture GetBackground();
+        public virtual Texture GetPanelBackground() => GetBackground();
         protected abstract Track GetBeatmapTrack();
 
         /// <summary>

osu.Game/Beatmaps/WorkingBeatmapCache.cs

@@ -42,6 +42,7 @@ namespace osu.Game.Beatmaps
         private readonly AudioManager audioManager;
         private readonly IResourceStore<byte[]> resources;
         private readonly LargeTextureStore largeTextureStore;
+        private readonly LargeTextureStore beatmapPanelTextureStore;
         private readonly ITrackStore trackStore;
         private readonly IResourceStore<byte[]> files;
 
@@ -58,6 +59,7 @@ namespace osu.Game.Beatmaps
             this.host = host;
             this.files = files;
             largeTextureStore = new LargeTextureStore(host?.Renderer ?? new DummyRenderer(), host?.CreateTextureLoaderStore(files));
+            beatmapPanelTextureStore = new LargeTextureStore(host?.Renderer ?? new DummyRenderer(), new BeatmapPanelBackgroundTextureLoaderStore(host?.CreateTextureLoaderStore(files)));
             this.trackStore = trackStore;
         }
 
@@ -110,6 +112,7 @@ namespace osu.Game.Beatmaps
         #region IResourceStorageProvider
 
         TextureStore IBeatmapResourceProvider.LargeTextureStore => largeTextureStore;
+        TextureStore IBeatmapResourceProvider.BeatmapPanelTextureStore => beatmapPanelTextureStore;
         ITrackStore IBeatmapResourceProvider.Tracks => trackStore;
         IRenderer IStorageResourceProvider.Renderer => host?.Renderer ?? new DummyRenderer();
         AudioManager IStorageResourceProvider.AudioManager => audioManager;
@@ -160,7 +163,11 @@ namespace osu.Game.Beatmaps
                 }
             }
 
-            public override Texture GetBackground()
+            public override Texture GetPanelBackground() => getBackgroundFromStore(resources.BeatmapPanelTextureStore);
+
+            public override Texture GetBackground() => getBackgroundFromStore(resources.LargeTextureStore);
+
+            private Texture getBackgroundFromStore(TextureStore store)
             {
                 if (string.IsNullOrEmpty(Metadata?.BackgroundFile))
                     return null;
@@ -168,7 +175,7 @@ namespace osu.Game.Beatmaps
                 try
                 {
                     string fileStorePath = BeatmapSetInfo.GetPathForFile(Metadata.BackgroundFile);
-                    var texture = resources.LargeTextureStore.Get(fileStorePath);
+                    var texture = store.Get(fileStorePath);
 
                     if (texture == null)
                     {

osu.Game/Screens/Select/Carousel/SetPanelBackground.cs

@@ -1,12 +1,14 @@
 // 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 System;
+using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Colour;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.Sprites;
 using osu.Game.Beatmaps;
-using osu.Game.Beatmaps.Drawables;
 using osuTK;
 using osuTK.Graphics;
 
@@ -21,7 +23,7 @@ namespace osu.Game.Screens.Select.Carousel
 
             Children = new Drawable[]
             {
-                new BeatmapBackgroundSprite(working)
+                new PanelBeatmapBackground(working)
                 {
                     RelativeSizeAxes = Axes.Both,
                     Anchor = Anchor.Centre,
@@ -68,5 +70,23 @@ namespace osu.Game.Screens.Select.Carousel
                 },
             };
         }
+
+        public partial class PanelBeatmapBackground : Sprite
+        {
+            private readonly IWorkingBeatmap working;
+
+            public PanelBeatmapBackground(IWorkingBeatmap working)
+            {
+                ArgumentNullException.ThrowIfNull(working);
+
+                this.working = working;
+            }
+
+            [BackgroundDependencyLoader]
+            private void load()
+            {
+                Texture = working.GetPanelBackground();
+            }
+        }
     }
 }