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Code Issues Releases Wiki Activity

Avoid saving state changes if nothing has changed (via binary comparison)

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This commit is contained in:
Dean Herbert 2020-09-28 15:30:18 +09:00
parent 600d37cc04
commit 3cf430f494
2 changed files with 71 additions and 14 deletions
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57
osu.Game.Tests/Editing/EditorChangeHandlerTest.cs
View File

@ -2,7 +2,9 @@
// See the LICENCE file in the repository root for full licence text.
using NUnit.Framework;
using osu.Framework.Utils;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Screens.Edit;
namespace osu.Game.Tests.Editing
@ -13,11 +15,12 @@ namespace osu.Game.Tests.Editing
[Test]
public void TestSaveRestoreState()
{
var handler = new EditorChangeHandler(new EditorBeatmap(new Beatmap()));
var (handler, beatmap) = createChangeHandler();
Assert.That(handler.CanUndo.Value, Is.False);
Assert.That(handler.CanRedo.Value, Is.False);
addArbitraryChange(beatmap);
handler.SaveState();
Assert.That(handler.CanUndo.Value, Is.True);
@ -29,15 +32,48 @@ namespace osu.Game.Tests.Editing
Assert.That(handler.CanRedo.Value, Is.True);
}
[Test]
public void TestSaveSameStateDoesNotSave()
{
var (handler, beatmap) = createChangeHandler();
Assert.That(handler.CanUndo.Value, Is.False);
Assert.That(handler.CanRedo.Value, Is.False);
addArbitraryChange(beatmap);
handler.SaveState();
Assert.That(handler.CanUndo.Value, Is.True);
Assert.That(handler.CanRedo.Value, Is.False);
string hash = handler.CurrentStateHash;
// save a save without making any changes
handler.SaveState();
Assert.That(hash, Is.EqualTo(handler.CurrentStateHash));
handler.RestoreState(-1);
Assert.That(hash, Is.Not.EqualTo(handler.CurrentStateHash));
// we should only be able to restore once even though we saved twice.
Assert.That(handler.CanUndo.Value, Is.False);
Assert.That(handler.CanRedo.Value, Is.True);
}
[Test]
public void TestMaxStatesSaved()
{
var handler = new EditorChangeHandler(new EditorBeatmap(new Beatmap()));
var (handler, beatmap) = createChangeHandler();
Assert.That(handler.CanUndo.Value, Is.False);
for (int i = 0; i < EditorChangeHandler.MAX_SAVED_STATES; i++)
{
addArbitraryChange(beatmap);
handler.SaveState();
}
Assert.That(handler.CanUndo.Value, Is.True);
@ -53,12 +89,15 @@ namespace osu.Game.Tests.Editing
[Test]
public void TestMaxStatesExceeded()
{
var handler = new EditorChangeHandler(new EditorBeatmap(new Beatmap()));
var (handler, beatmap) = createChangeHandler();
Assert.That(handler.CanUndo.Value, Is.False);
for (int i = 0; i < EditorChangeHandler.MAX_SAVED_STATES * 2; i++)
{
addArbitraryChange(beatmap);
handler.SaveState();
}
Assert.That(handler.CanUndo.Value, Is.True);
@ -70,5 +109,17 @@ namespace osu.Game.Tests.Editing
Assert.That(handler.CanUndo.Value, Is.False);
}
private (EditorChangeHandler, EditorBeatmap) createChangeHandler()
{
var beatmap = new EditorBeatmap(new Beatmap());
return (new EditorChangeHandler(beatmap), beatmap);
}
private void addArbitraryChange(EditorBeatmap beatmap)
{
beatmap.Add(new HitCircle { StartTime = RNG.Next(0, 100000) });
}
}
}

28
osu.Game/Screens/Edit/EditorChangeHandler.cs
View File

@ -4,9 +4,11 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using osu.Framework.Bindables;
using osu.Framework.Extensions;
using osu.Framework.Logging;
using osu.Game.Beatmaps.Formats;
using osu.Game.Rulesets.Objects;
@ -89,23 +91,27 @@ namespace osu.Game.Screens.Edit
if (isRestoring)
return;
if (currentState < savedStates.Count - 1)
savedStates.RemoveRange(currentState + 1, savedStates.Count - currentState - 1);
if (savedStates.Count > MAX_SAVED_STATES)
savedStates.RemoveAt(0);
using (var stream = new MemoryStream())
{
using (var sw = new StreamWriter(stream, Encoding.UTF8, 1024, true))
new LegacyBeatmapEncoder(editorBeatmap, editorBeatmap.BeatmapSkin).Encode(sw);
savedStates.Add(stream.ToArray());
var newState = stream.ToArray();
// if the previous state is binary equal we don't need to push a new one, unless this is the initial state.
if (savedStates.Count > 0 && newState.SequenceEqual(savedStates.Last())) return;
if (currentState < savedStates.Count - 1)
savedStates.RemoveRange(currentState + 1, savedStates.Count - currentState - 1);
if (savedStates.Count > MAX_SAVED_STATES)
savedStates.RemoveAt(0);
savedStates.Add(newState);
currentState = savedStates.Count - 1;
updateBindables();
}
currentState = savedStates.Count - 1;
updateBindables();
}
/// <summary>