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FontCollection.cs
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FontCollection.cs
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// Copyright (c) Six Labors.
// Licensed under the Apache License, Version 2.0.
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using SixLabors.Fonts.Exceptions;
using SixLabors.Fonts.Tables;
namespace SixLabors.Fonts
{
/// <summary>
/// Provides a collection of fonts.
/// </summary>
public sealed class FontCollection : IFontCollection
{
private readonly HashSet<IFontInstance> instances = new HashSet<IFontInstance>();
/// <summary>
/// Initializes a new instance of the <see cref="FontCollection"/> class.
/// </summary>
public FontCollection()
{
}
/// <inheritdoc />
public IEnumerable<FontFamily> Families => this.FamiliesByCultureInternal(CultureInfo.CurrentCulture);
#if SUPPORTS_CULTUREINFO_LCID
/// <inheritdoc />
public IEnumerable<FontFamily> FamiliesByCulture(CultureInfo culture) => this.FamiliesByCultureInternal(culture);
#endif
private IEnumerable<FontFamily> FamiliesByCultureInternal(CultureInfo culture)
=> this.instances
.Select(x => x.Description.FontFamily(culture))
.Distinct()
.Select(x => new FontFamily(x, this, culture))
.ToArray();
/// <summary>
/// Installs a font from the specified path.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(string path)
=> this.InstallInternal(path, CultureInfo.CurrentCulture);
/// <summary>
/// Installs a font from the specified path.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="fontDescription">The font description of the installed font.</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(string path, out FontDescription fontDescription)
=> this.InstallInternal(path, CultureInfo.CurrentCulture, out fontDescription);
/// <summary>
/// Installs the specified font stream.
/// </summary>
/// <param name="fontStream">The font stream.</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(Stream fontStream)
=> this.InstallInternal(fontStream, CultureInfo.InvariantCulture);
/// <summary>
/// Installs the specified font stream.
/// </summary>
/// <param name="fontStream">The font stream.</param>
/// <param name="fontDescription">The font description of the installed font.</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(Stream fontStream, out FontDescription fontDescription)
=> this.InstallInternal(fontStream, CultureInfo.InvariantCulture, out fontDescription);
/// <summary>
/// Installs a true type font collection (.ttc) from the specified font collection stream.
/// </summary>
/// <param name="fontCollectionPath">The font collection path (should be typically a .ttc file like simsun.ttc).</param>
/// <returns>The font descriptions of the installed fonts.</returns>
public IEnumerable<FontFamily> InstallCollection(string fontCollectionPath)
=> this.InstallCollectionInternal(fontCollectionPath, CultureInfo.InvariantCulture);
/// <summary>
/// Installs a true type font collection (.ttc) from the specified font collection stream.
/// </summary>
/// <param name="fontCollectionPath">The font collection path (should be typically a .ttc file like simsun.ttc).</param>
/// <param name="fontDescriptions">The descriptions of fonts installed from the collection.</param>
/// <returns>The font descriptions of the installed fonts.</returns>
public IEnumerable<FontFamily> InstallCollection(string fontCollectionPath, out IEnumerable<FontDescription> fontDescriptions)
=> this.InstallCollectionInternal(fontCollectionPath, CultureInfo.InvariantCulture, out fontDescriptions);
/// <summary>
/// Installs a true type font collection (.ttc) from the specified font collection stream.
/// </summary>
/// <param name="fontCollectionStream">The font stream.</param>
/// <param name="fontDescriptions">The descriptions of fonts installed from the collection.</param>
/// <returns>The font descriptions of the installed fonts.</returns>
public IEnumerable<FontFamily> InstallCollection(Stream fontCollectionStream, out IEnumerable<FontDescription> fontDescriptions)
=> this.InstallCollectionInternal(fontCollectionStream, CultureInfo.InvariantCulture, out fontDescriptions);
#if SUPPORTS_CULTUREINFO_LCID
/// <summary>
/// Installs a font from the specified path.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="culture">The culture of the retuend font family</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(string path, CultureInfo culture)
=> this.InstallInternal(path, culture);
/// <summary>
/// Installs a font from the specified path.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="culture">The culture of the retuend font family</param>
/// <param name="fontDescription">The font description of the installed font.</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(string path, CultureInfo culture, out FontDescription fontDescription)
=> this.InstallInternal(path, culture, out fontDescription);
/// <summary>
/// Installs the specified font stream.
/// </summary>
/// <param name="fontStream">The font stream.</param>
/// <param name="culture">The culture of the retuend font family</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(Stream fontStream, CultureInfo culture)
=> this.InstallInternal(fontStream, culture);
/// <summary>
/// Installs the specified font stream.
/// </summary>
/// <param name="fontStream">The font stream.</param>
/// <param name="culture">The culture of the retuend font family</param>
/// <param name="fontDescription">The font description of the installed font.</param>
/// <returns>the description of the font just loaded.</returns>
public FontFamily Install(Stream fontStream, CultureInfo culture, out FontDescription fontDescription)
=> this.InstallInternal(fontStream, culture, out fontDescription);
/// <summary>
/// Installs a true type font collection (.ttc) from the specified font collection stream.
/// </summary>
/// <param name="fontCollectionPath">The font collection path (should be typically a .ttc file like simsun.ttc).</param>
/// <returns>The font descriptions of the installed fonts.</returns>
/// <param name="culture">The culture of the retuend font families</param>
public IEnumerable<FontFamily> InstallCollection(string fontCollectionPath, CultureInfo culture)
=> this.InstallCollectionInternal(fontCollectionPath, culture);
/// <summary>
/// Installs a true type font collection (.ttc) from the specified font collection stream.
/// </summary>
/// <param name="fontCollectionPath">The font collection path (should be typically a .ttc file like simsun.ttc).</param>
/// <param name="culture">The culture of the retuend font families</param>
/// <param name="fontDescriptions">The descriptions of fonts installed from the collection.</param>
/// <returns>The font descriptions of the installed fonts.</returns>
public IEnumerable<FontFamily> InstallCollection(string fontCollectionPath, CultureInfo culture, out IEnumerable<FontDescription> fontDescriptions)
=> this.InstallCollectionInternal(fontCollectionPath, culture, out fontDescriptions);
/// <summary>
/// Installs a true type font collection (.ttc) from the specified font collection stream.
/// </summary>
/// <param name="fontCollectionStream">The font stream.</param>
/// <param name="culture">The culture of the retuend font families</param>
/// <param name="fontDescriptions">The descriptions of fonts installed from the collection.</param>
/// <returns>The font descriptions of the installed fonts.</returns>
public IEnumerable<FontFamily> InstallCollection(Stream fontCollectionStream, CultureInfo culture, out IEnumerable<FontDescription> fontDescriptions)
=> this.InstallCollectionInternal(fontCollectionStream, culture, out fontDescriptions);
#endif
private FontFamily InstallInternal(string path, CultureInfo culture)
=> this.InstallInternal(path, culture, out _);
private FontFamily InstallInternal(string path, CultureInfo culture, out FontDescription fontDescription)
{
var instance = new FileFontInstance(path);
fontDescription = instance.Description;
return this.Install(instance, culture);
}
private FontFamily InstallInternal(Stream fontStream, CultureInfo culture)
=> this.InstallInternal(fontStream, culture, out _);
private FontFamily InstallInternal(Stream fontStream, CultureInfo culture, out FontDescription fontDescription)
{
var instance = FontInstance.LoadFont(fontStream);
fontDescription = instance.Description;
return this.Install(instance, culture);
}
private IEnumerable<FontFamily> InstallCollectionInternal(string fontCollectionPath, CultureInfo culture)
=> this.InstallCollectionInternal(fontCollectionPath, culture, out _);
private IEnumerable<FontFamily> InstallCollectionInternal(string fontCollectionPath, CultureInfo culture, out IEnumerable<FontDescription> fontDescriptions)
{
FileFontInstance[] fonts = FileFontInstance.LoadFontCollection(fontCollectionPath);
var description = new FontDescription[fonts.Length];
var families = new HashSet<FontFamily>();
for (int i = 0; i < fonts.Length; i++)
{
description[i] = fonts[i].Description;
FontFamily family = this.Install(fonts[i], culture);
families.Add(family);
}
fontDescriptions = description;
return families;
}
private IEnumerable<FontFamily> InstallCollectionInternal(Stream fontCollectionStream, CultureInfo culture, out IEnumerable<FontDescription> fontDescriptions)
{
long startPos = fontCollectionStream.Position;
var reader = new BigEndianBinaryReader(fontCollectionStream, true);
var ttcHeader = TtcHeader.Read(reader);
var result = new List<FontDescription>((int)ttcHeader.NumFonts);
var installedFamilies = new HashSet<FontFamily>();
for (int i = 0; i < ttcHeader.NumFonts; ++i)
{
fontCollectionStream.Position = startPos + ttcHeader.OffsetTable[i];
var instance = FontInstance.LoadFont(fontCollectionStream);
installedFamilies.Add(this.Install(instance, culture));
FontDescription fontDescription = instance.Description;
result.Add(fontDescription);
}
fontDescriptions = result;
return installedFamilies;
}
#if SUPPORTS_CULTUREINFO_LCID
/// <inheritdoc />
public FontFamily Find(string fontFamily, CultureInfo culture)
=> this.FindInternal(fontFamily, culture);
/// <inheritdoc />
public bool TryFind(string fontFamily, CultureInfo culture, [NotNullWhen(true)] out FontFamily? family)
=> this.TryFindInternal(fontFamily, culture, out family);
#endif
private FontFamily FindInternal(string fontFamily, CultureInfo culture)
{
if (this.TryFindInternal(fontFamily, culture, out FontFamily? result))
{
return result;
}
throw new FontFamilyNotFoundException(fontFamily);
}
private bool TryFindInternal(string fontFamily, CultureInfo culture, [NotNullWhen(true)] out FontFamily? family)
{
StringComparer? comparer = StringComparerHelpers.GetCaseInsensitiveStringComparer(culture);
family = null!; // make the compiler shutup
string? familyName = this.instances
.Select(x => x.Description.FontFamily(culture))
.FirstOrDefault(x => comparer.Equals(x, fontFamily));
if (familyName == null)
{
return false;
}
family = new FontFamily(familyName, this, culture);
return true;
}
/// <inheritdoc />
public FontFamily Find(string fontFamily)
=> this.FindInternal(fontFamily, CultureInfo.InvariantCulture);
/// <inheritdoc />
public bool TryFind(string fontFamily, [NotNullWhen(true)] out FontFamily? family)
=> this.TryFindInternal(fontFamily, CultureInfo.InvariantCulture, out family);
internal IEnumerable<FontStyle> AvailableStyles(string fontFamily, CultureInfo culture)
=> this.FindAll(fontFamily, culture).Select(x => x.Description.Style).ToArray();
internal FontFamily Install(IFontInstance instance, CultureInfo culture)
{
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
if (instance.Description == null)
{
throw new ArgumentException("IFontInstance must have a Description.", nameof(instance));
}
lock (this.instances)
{
this.instances.Add(instance);
}
return new FontFamily(instance.Description.FontFamily(culture), this, culture);
}
internal IFontInstance? Find(string fontFamily, CultureInfo culture, FontStyle style)
=> this.FindAll(fontFamily, culture)
.FirstOrDefault(x => x.Description.Style == style);
internal IEnumerable<IFontInstance> FindAll(string name, CultureInfo culture)
{
StringComparer? comparer = StringComparerHelpers.GetCaseInsensitiveStringComparer(culture);
return this.instances
.Where(x => comparer.Equals(x.Description.FontFamily(culture), name))
.ToArray();
}
}
}