mirror of https://github.com/ppy/osu
114 lines
3.9 KiB
C#
114 lines
3.9 KiB
C#
// 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.Text;
|
|
using DiffPlex;
|
|
using osu.Framework.Audio.Track;
|
|
using osu.Framework.Graphics.Textures;
|
|
using osu.Game.Beatmaps;
|
|
using osu.Game.IO;
|
|
using Decoder = osu.Game.Beatmaps.Formats.Decoder;
|
|
|
|
namespace osu.Game.Screens.Edit
|
|
{
|
|
/// <summary>
|
|
/// Patches an <see cref="EditorBeatmap"/> based on the difference between two legacy (.osu) states.
|
|
/// </summary>
|
|
public class LegacyEditorBeatmapPatcher
|
|
{
|
|
private readonly EditorBeatmap editorBeatmap;
|
|
|
|
public LegacyEditorBeatmapPatcher(EditorBeatmap editorBeatmap)
|
|
{
|
|
this.editorBeatmap = editorBeatmap;
|
|
}
|
|
|
|
public void Patch(byte[] currentState, byte[] newState)
|
|
{
|
|
// Diff the beatmaps
|
|
var result = new Differ().CreateLineDiffs(readString(currentState), readString(newState), true, false);
|
|
|
|
// Find the index of [HitObject] sections. Lines changed prior to this index are ignored.
|
|
int oldHitObjectsIndex = Array.IndexOf(result.PiecesOld, "[HitObjects]");
|
|
int newHitObjectsIndex = Array.IndexOf(result.PiecesNew, "[HitObjects]");
|
|
|
|
var toRemove = new List<int>();
|
|
var toAdd = new List<int>();
|
|
|
|
foreach (var block in result.DiffBlocks)
|
|
{
|
|
// Removed hitobjects
|
|
for (int i = 0; i < block.DeleteCountA; i++)
|
|
{
|
|
int hoIndex = block.DeleteStartA + i - oldHitObjectsIndex - 1;
|
|
|
|
if (hoIndex < 0)
|
|
continue;
|
|
|
|
toRemove.Add(hoIndex);
|
|
}
|
|
|
|
// Added hitobjects
|
|
for (int i = 0; i < block.InsertCountB; i++)
|
|
{
|
|
int hoIndex = block.InsertStartB + i - newHitObjectsIndex - 1;
|
|
|
|
if (hoIndex < 0)
|
|
continue;
|
|
|
|
toAdd.Add(hoIndex);
|
|
}
|
|
}
|
|
|
|
// Sort the indices to ensure that removal + insertion indices don't get jumbled up post-removal or post-insertion.
|
|
// This isn't strictly required, but the differ makes no guarantees about order.
|
|
toRemove.Sort();
|
|
toAdd.Sort();
|
|
|
|
// Apply the changes.
|
|
for (int i = toRemove.Count - 1; i >= 0; i--)
|
|
editorBeatmap.RemoveAt(toRemove[i]);
|
|
|
|
if (toAdd.Count > 0)
|
|
{
|
|
IBeatmap newBeatmap = readBeatmap(newState);
|
|
foreach (var i in toAdd)
|
|
editorBeatmap.Insert(i, newBeatmap.HitObjects[i]);
|
|
}
|
|
}
|
|
|
|
private string readString(byte[] state) => Encoding.UTF8.GetString(state);
|
|
|
|
private IBeatmap readBeatmap(byte[] state)
|
|
{
|
|
using (var stream = new MemoryStream(state))
|
|
using (var reader = new LineBufferedReader(stream, true))
|
|
{
|
|
var decoded = Decoder.GetDecoder<Beatmap>(reader).Decode(reader);
|
|
decoded.BeatmapInfo.Ruleset = editorBeatmap.BeatmapInfo.Ruleset;
|
|
return new PassThroughWorkingBeatmap(decoded).GetPlayableBeatmap(editorBeatmap.BeatmapInfo.Ruleset);
|
|
}
|
|
}
|
|
|
|
private class PassThroughWorkingBeatmap : WorkingBeatmap
|
|
{
|
|
private readonly IBeatmap beatmap;
|
|
|
|
public PassThroughWorkingBeatmap(IBeatmap beatmap)
|
|
: base(beatmap.BeatmapInfo, null)
|
|
{
|
|
this.beatmap = beatmap;
|
|
}
|
|
|
|
protected override IBeatmap GetBeatmap() => beatmap;
|
|
|
|
protected override Texture GetBackground() => throw new NotImplementedException();
|
|
|
|
protected override Track GetTrack() => throw new NotImplementedException();
|
|
}
|
|
}
|
|
}
|