osu/osu.Game/Beatmaps/BeatmapPanelBackgroundTextureLoaderStore.cs

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// 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>
{
// The aspect ratio of SetPanelBackground at its maximum size (very tall window).
private const float minimum_display_ratio = 512 / 80f;
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();
// Assume that panel backgrounds are always displayed using `FillMode.Fill`.
// Also assume that all backgrounds are wider than they are tall, so the
// fill is always going to be based on width.
//
// We need to include enough height to make this work for all ratio panels are displayed at.
int usableHeight = (int)Math.Ceiling(size.Width * 1 / minimum_display_ratio);
usableHeight = Math.Min(size.Height, usableHeight);
// Crop the centre region of the background for now.
Rectangle cropRectangle = new Rectangle(
0,
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(size.Height - usableHeight) / 2,
size.Width,
usableHeight
);
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>();
}
}