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osu-lazer/osu.Game/Skinning/LegacyTextureLoaderStore.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.Skinning
{
public class LegacyTextureLoaderStore : IResourceStore<TextureUpload>
{
private readonly IResourceStore<TextureUpload>? wrappedStore;
public LegacyTextureLoaderStore(IResourceStore<TextureUpload>? wrappedStore)
{
this.wrappedStore = wrappedStore;
}
public TextureUpload Get(string name)
{
var textureUpload = wrappedStore?.Get(name);
if (textureUpload == null)
return null!;
return shouldConvertToGrayscale(name)
? convertToGrayscale(textureUpload)
: textureUpload;
}
public Task<TextureUpload> GetAsync(string name, CancellationToken cancellationToken = new CancellationToken())
{
var textureUpload = wrappedStore?.Get(name);
if (textureUpload == null)
return null!;
return shouldConvertToGrayscale(name)
? Task.Run(() => convertToGrayscale(textureUpload), cancellationToken)
: Task.FromResult(textureUpload);
}
// https://github.com/peppy/osu-stable-reference/blob/013c3010a9d495e3471a9c59518de17006f9ad89/osu!/Graphics/Textures/TextureManager.cs#L91-L96
private static readonly string[] grayscale_sprites =
{
@"taiko-bar-right",
@"taikobigcircle",
@"taikohitcircle",
@"taikohitcircleoverlay"
};
private bool shouldConvertToGrayscale(string name)
{
foreach (string grayscaleSprite in grayscale_sprites)
{
// unfortunately at this level of lookup we can encounter `@2x` scale suffixes in the name,
// so straight equality cannot be used.
if (name.Equals(grayscaleSprite, StringComparison.OrdinalIgnoreCase)
|| name.Equals($@"{grayscaleSprite}@2x", StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
private TextureUpload convertToGrayscale(TextureUpload textureUpload)
{
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var image = Image.LoadPixelData(textureUpload.Data, textureUpload.Width, textureUpload.Height);
// stable uses `0.299 * r + 0.587 * g + 0.114 * b`
// (https://github.com/peppy/osu-stable-reference/blob/013c3010a9d495e3471a9c59518de17006f9ad89/osu!/Graphics/Textures/pTexture.cs#L138-L153)
// which matches mode BT.601 (https://en.wikipedia.org/wiki/Grayscale#Luma_coding_in_video_systems)
image.Mutate(i => i.Grayscale(GrayscaleMode.Bt601));
return new TextureUpload(image);
}
public Stream? GetStream(string name) => wrappedStore?.GetStream(name);
public IEnumerable<string> GetAvailableResources() => wrappedStore?.GetAvailableResources() ?? Array.Empty<string>();
public void Dispose()
{
wrappedStore?.Dispose();
}
}
}