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reduce string allocations when rendering text
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parent
92c91928b2
commit
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3 changed files with 32 additions and 2 deletions
27
MLEM/Extensions/CharExtensions.cs
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27
MLEM/Extensions/CharExtensions.cs
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@ -0,0 +1,27 @@
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using System;
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using System.Collections.Generic;
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namespace MLEM.Extensions {
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/// <summary>
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/// A set of extensions for dealing with <see cref="char"/>
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/// </summary>
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public static class CharExtensions {
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private static readonly Dictionary<char, string> Cache = new Dictionary<char, string>();
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/// <summary>
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/// Returns the string representation of this character which will be stored and retrieved from a dictionary cache.
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/// This method reduces string allocations, making it trade in processor efficiency for memory efficiency.
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/// </summary>
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/// <param name="c">The character to turn into a string</param>
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/// <returns>A string representing the character</returns>
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public static string ToCachedString(this char c) {
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if (!Cache.TryGetValue(c, out var ret)) {
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ret = c.ToString();
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Cache.Add(c, ret);
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}
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return ret;
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}
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}
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}
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@ -1,6 +1,8 @@
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using System.Text;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using MLEM.Extensions;
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using MLEM.Misc;
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namespace MLEM.Font {
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/// <inheritdoc/>
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@ -32,7 +34,7 @@ namespace MLEM.Font {
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/// <inheritdoc />
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protected override Vector2 MeasureChar(char c) {
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return this.Font.MeasureString(c.ToString());
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return this.Font.MeasureString(c.ToCachedString());
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}
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/// <inheritdoc/>
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@ -3,6 +3,7 @@ using System.Linq;
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using System.Text;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using MLEM.Extensions;
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using MLEM.Font;
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using MLEM.Formatting.Codes;
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using MLEM.Misc;
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@ -124,7 +125,7 @@ namespace MLEM.Formatting {
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if (i == 0)
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token.DrawSelf(time, batch, pos + innerOffset, font, color, scale, depth);
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var cString = c.ToString();
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var cString = c.ToCachedString();
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token.DrawCharacter(time, batch, c, cString, i, pos + innerOffset, drawFont, drawColor, scale, depth);
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innerOffset.X += font.MeasureString(cString).X * scale;
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}
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