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osu-lazer/osu.Game/Beatmaps/Formats/BeatmapDecoder.cs

63 lines
1.8 KiB
C#

using System;
using System.Collections.Generic;
using System.IO;
using osu.Game.Modes.Objects;
using OpenTK.Graphics;
namespace osu.Game.Beatmaps.Formats
{
public abstract class BeatmapDecoder
{
private static Dictionary<string, Type> decoders { get; } = new Dictionary<string, Type>();
public static BeatmapDecoder GetDecoder(TextReader stream)
{
var line = stream.ReadLine().Trim();
if (!decoders.ContainsKey(line))
throw new IOException(@"Unknown file format");
return (BeatmapDecoder)Activator.CreateInstance(decoders[line]);
}
protected static void AddDecoder<T>(string magic) where T : BeatmapDecoder
{
decoders[magic] = typeof(T);
}
public virtual Beatmap Decode(TextReader stream)
{
Beatmap b = ParseFile(stream);
Process(b);
return b;
}
public virtual Beatmap Process(Beatmap beatmap)
{
ApplyColours(beatmap);
return beatmap;
}
protected abstract Beatmap ParseFile(TextReader stream);
public virtual void ApplyColours(Beatmap b)
{
List<Color4> colours = b.ComboColors ?? new List<Color4>() {
new Color4(17, 136, 170, 255),
new Color4(102,136,0, 255),
new Color4(204,102,0, 255),
new Color4(121,9,13, 255),
};
if (colours.Count == 0) return;
int i = -1;
foreach (HitObject h in b.HitObjects)
{
if (h.NewCombo || i == -1) i = (i + 1) % colours.Count;
h.Colour = colours[i];
}
}
}
}