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reduce string allocations when rendering text

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Ellpeck 2020-06-21 23:23:52 +02:00
parent 92c91928b2
commit d891e19d2a
3 changed files with 32 additions and 2 deletions
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27
MLEM/Extensions/CharExtensions.cs Normal file
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@ -0,0 +1,27 @@
using System;
using System.Collections.Generic;
namespace MLEM.Extensions {
/// <summary>
/// A set of extensions for dealing with <see cref="char"/>
/// </summary>
public static class CharExtensions {
private static readonly Dictionary<char, string> Cache = new Dictionary<char, string>();
/// <summary>
/// Returns the string representation of this character which will be stored and retrieved from a dictionary cache.
/// This method reduces string allocations, making it trade in processor efficiency for memory efficiency.
/// </summary>
/// <param name="c">The character to turn into a string</param>
/// <returns>A string representing the character</returns>
public static string ToCachedString(this char c) {
if (!Cache.TryGetValue(c, out var ret)) {
ret = c.ToString();
Cache.Add(c, ret);
}
return ret;
}
}
}

4
MLEM/Font/GenericSpriteFont.cs
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@ -1,6 +1,8 @@
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Extensions;
using MLEM.Misc;
namespace MLEM.Font {
/// <inheritdoc/>
@ -32,7 +34,7 @@ namespace MLEM.Font {
/// <inheritdoc />
protected override Vector2 MeasureChar(char c) {
return this.Font.MeasureString(c.ToString());
return this.Font.MeasureString(c.ToCachedString());
}
/// <inheritdoc/>

3
MLEM/Formatting/TokenizedString.cs
View file

@ -3,6 +3,7 @@ using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Extensions;
using MLEM.Font;
using MLEM.Formatting.Codes;
using MLEM.Misc;
@ -124,7 +125,7 @@ namespace MLEM.Formatting {
if (i == 0)
token.DrawSelf(time, batch, pos + innerOffset, font, color, scale, depth);
var cString = c.ToString();
var cString = c.ToCachedString();
token.DrawCharacter(time, batch, c, cString, i, pos + innerOffset, drawFont, drawColor, scale, depth);
innerOffset.X += font.MeasureString(cString).X * scale;
}