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