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moved the new ConvertCachedUtf32 to CodePointSource

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This commit is contained in:
Ell 2022-10-23 21:23:16 +02:00
parent be7676d37e
commit d5e5d1d536
6 changed files with 26 additions and 26 deletions
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2
MLEM.Extended/Font/GenericStashFont.cs
View file

@ -33,7 +33,7 @@ namespace MLEM.Extended.Font {
/// <inheritdoc />
protected override float MeasureCharacter(int codePoint) {
return this.Font.MeasureString(this.ConvertCachedUtf32(codePoint)).X;
return this.Font.MeasureString(CodePointSource.ToString(codePoint)).X;
}
/// <inheritdoc />

4
MLEM/Extensions/CharExtensions.cs
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@ -5,7 +5,7 @@ namespace MLEM.Extensions {
/// <summary>
/// A set of extensions for dealing with <see cref="char"/>
/// </summary>
[Obsolete("ToCachedString is deprecated. Consider using a more robust, custom implementation for text caching.")]
[Obsolete("ToCachedString is deprecated. Consider using a more robust, custom implementation for text caching, or CodePointSource.ToString for UTF-32 caching.")]
public static class CharExtensions {
private static readonly Dictionary<char, string> Cache = new Dictionary<char, string>();
@ -16,7 +16,7 @@ namespace MLEM.Extensions {
/// </summary>
/// <param name="c">The character to turn into a string</param>
/// <returns>A string representing the character</returns>
[Obsolete("ToCachedString is deprecated. Consider using a more robust, custom implementation for text caching.")]
[Obsolete("ToCachedString is deprecated. Consider using a more robust, custom implementation for text caching, or CodePointSource.ToString for UTF-32 caching.")]
public static string ToCachedString(this char c) {
if (!CharExtensions.Cache.TryGetValue(c, out var ret)) {
ret = c.ToString();

19
MLEM/Font/CodePointSource.cs
View file

@ -4,10 +4,12 @@ using System.Text;
namespace MLEM.Font {
/// <summary>
/// A code point source is a wrapper around a <see cref="string"/> or <see cref="StringBuilder"/> that allows retrieving UTF-32 code points at a given index using <see cref="GetCodePoint"/>. Additionally, it allows enumerating every code point in the underlying <see cref="string"/> or <see cref="StringBuilder"/>.
/// A code point source is a wrapper around a <see cref="string"/> or <see cref="StringBuilder"/> that allows retrieving UTF-32 code points at a given index using <see cref="GetCodePoint"/>. Additionally, it allows enumerating every code point in the underlying <see cref="string"/> or <see cref="StringBuilder"/>. This class also contains <see cref="ToString(int)"/>, which converts a code point into its <see cref="string"/> representation, but caches the result to avoid allocating excess memory.
/// </summary>
public readonly struct CodePointSource : IEnumerable<int> {
private static readonly Dictionary<int, string> StringCache = new Dictionary<int, string>();
private readonly string strg;
private readonly StringBuilder builder;
private char this[int index] => this.strg?[index] ?? this.builder[index];
@ -42,7 +44,7 @@ namespace MLEM.Font {
/// </summary>
/// <param name="index">The index at which to return the code point, which is measured in characters.</param>
/// <param name="indexLowSurrogate">Whether the <paramref name="index"/> represents a low surrogate. If this is <see langword="false"/>, the <paramref name="index"/> represents a high surrogate and the low surrogate will be looked for in the following character. If this is <see langword="true"/>, the <paramref name="index"/> represents a low surrogate and the high surrogate will be looked for in the previous character.</param>
/// <returns></returns>
/// <returns>The code point at the given location, as well as its length.</returns>
public (int CodePoint, int Length) GetCodePoint(int index, bool indexLowSurrogate = false) {
var curr = this[index];
if (indexLowSurrogate) {
@ -80,5 +82,18 @@ namespace MLEM.Font {
return this.GetEnumerator();
}
/// <summary>
/// Converts the given UTF-32 <paramref name="codePoint"/> into a string using <see cref="char.ConvertFromUtf32"/>, but caches the result in a <see cref="Dictionary{TKey,TValue}"/> cache to avoid allocating excess memory.
/// </summary>
/// <param name="codePoint">The UTF-32 code point to convert.</param>
/// <returns>The string representation of the code point.</returns>
public static string ToString(int codePoint) {
if (!CodePointSource.StringCache.TryGetValue(codePoint, out var ret)) {
ret = char.ConvertFromUtf32(codePoint);
CodePointSource.StringCache.Add(codePoint, ret);
}
return ret;
}
}
}

23
MLEM/Font/GenericFont.cs
View file

@ -48,8 +48,6 @@ namespace MLEM.Font {
/// </summary>
public abstract float LineHeight { get; }
private readonly Dictionary<int, string> codePointCache = new Dictionary<int, string>();
/// <summary>
/// Measures the width of the given code point with the default scale for use in <see cref="MeasureString(string,bool)"/>.
/// Note that this method does not support <see cref="Nbsp"/>, <see cref="Zwsp"/> and <see cref="Emsp"/> for most generic fonts, which is why <see cref="MeasureString(string,bool)"/> should be used even for single characters.
@ -175,19 +173,6 @@ namespace MLEM.Font {
return this.SplitStringSeparate(new CodePointSource(text), width, scale, null);
}
/// <summary>
/// Converts the given UTF-32 <paramref name="codePoint"/> into a string using <see cref="char.ConvertFromUtf32"/>, but caches the result in a <see cref="Dictionary{TKey,TValue}"/> cache to avoid allocating excess memory.
/// </summary>
/// <param name="codePoint">The UTF-32 code point to convert.</param>
/// <returns>The string representation of the code point.</returns>
public string ConvertCachedUtf32(int codePoint) {
if (!this.codePointCache.TryGetValue(codePoint, out var ret)) {
ret = char.ConvertFromUtf32(codePoint);
this.codePointCache.Add(codePoint, ret);
}
return ret;
}
internal Vector2 MeasureString(CodePointSource text, bool ignoreTrailingSpaces, Func<int, GenericFont> fontFunction) {
var size = Vector2.Zero;
if (text.Length <= 0)
@ -240,9 +225,9 @@ namespace MLEM.Font {
var innerIndex = fromBack ? text.Length - 1 - index : index;
var (codePoint, length) = text.GetCodePoint(innerIndex, fromBack);
if (fromBack) {
total.Insert(0, this.ConvertCachedUtf32(codePoint));
total.Insert(0, CodePointSource.ToString(codePoint));
} else {
total.Append(this.ConvertCachedUtf32(codePoint));
total.Append(CodePointSource.ToString(codePoint));
}
if (this.MeasureString(new CodePointSource(total + ellipsis), false, fontFunction).X * scale >= width) {
@ -273,7 +258,7 @@ namespace MLEM.Font {
currWidth = 0;
} else {
var font = fontFunction?.Invoke(index) ?? this;
var character = this.ConvertCachedUtf32(codePoint);
var character = CodePointSource.ToString(codePoint);
var charWidth = font.MeasureString(character).X * scale;
if (codePoint == ' ' || codePoint == GenericFont.Emsp || codePoint == GenericFont.Zwsp) {
// remember the location of this (breaking!) space
@ -349,7 +334,7 @@ namespace MLEM.Font {
offset.X = 0;
offset.Y += this.LineHeight;
} else {
var character = this.ConvertCachedUtf32(codePoint);
var character = CodePointSource.ToString(codePoint);
var charSize = this.MeasureString(character);
var charPos = offset;

2
MLEM/Font/GenericSpriteFont.cs
View file

@ -35,7 +35,7 @@ namespace MLEM.Font {
/// <inheritdoc />
protected override float MeasureCharacter(int codePoint) {
return this.Font.MeasureString(this.ConvertCachedUtf32(codePoint)).X;
return this.Font.MeasureString(CodePointSource.ToString(codePoint)).X;
}
/// <inheritdoc />

2
MLEM/Formatting/TokenizedString.cs
View file

@ -164,7 +164,7 @@ namespace MLEM.Formatting {
var line = new CodePointSource(token.SplitDisplayString[l]);
while (charIndex < line.Length) {
var (codePoint, length) = line.GetCodePoint(charIndex);
var character = drawFont.ConvertCachedUtf32(codePoint);
var character = CodePointSource.ToString(codePoint);
if (indexInToken == 0)
token.DrawSelf(time, batch, pos + innerOffset, drawFont, color, scale, depth);