Add system font matcher.
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189
Assets/Cryville/Common/Font/FontTable.cs
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189
Assets/Cryville/Common/Font/FontTable.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace Cryville.Common.Font {
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public abstract class FontTable<T> {
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protected UInt32 Offset { get; private set; }
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protected BinaryReader Reader { get; private set; }
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protected FontTable(BinaryReader reader, UInt32 offset) {
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Reader = reader;
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Offset = offset;
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reader.BaseStream.Position = offset;
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}
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public abstract IReadOnlyList<T> GetItems();
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}
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public abstract class FontTable<T, U> : FontTable<T> {
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protected FontTable(BinaryReader reader, UInt32 offset) : base(reader, offset) { }
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public abstract U GetSubTable(T item);
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}
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public sealed class TTCHeader : FontTable<UInt32, TableDirectory> {
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readonly String ttcTag;
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readonly UInt16 majorVersion;
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readonly UInt16 minorVersion;
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readonly UInt32 numFonts;
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readonly List<UInt32> tableDirectoryOffsets = new List<UInt32>();
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readonly String dsigTag;
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readonly UInt32 dsigLength;
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readonly UInt32 dsigOffset;
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public TTCHeader(BinaryReader reader, UInt32 offset) : base(reader, offset) {
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ttcTag = reader.ReadTag();
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if (ttcTag != "ttcf") throw new NotImplementedException();
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majorVersion = reader.ReadUInt16();
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minorVersion = reader.ReadUInt16();
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numFonts = reader.ReadUInt32();
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for (UInt32 i = 0; i < numFonts; i++) tableDirectoryOffsets.Add(reader.ReadUInt32());
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if (majorVersion == 2) {
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dsigTag = reader.ReadTag();
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dsigLength = reader.ReadUInt32();
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dsigOffset = reader.ReadUInt32();
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}
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}
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public override IReadOnlyList<UInt32> GetItems() {
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return tableDirectoryOffsets;
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}
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public override TableDirectory GetSubTable(UInt32 item) {
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var i = (UInt32)item;
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return new TableDirectory(Reader, i);
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}
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}
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public sealed class TableDirectory : FontTable<TableRecord, object> {
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readonly UInt32 sfntVersion;
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readonly UInt16 numTables;
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readonly UInt16 searchRange;
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readonly UInt16 entrySelector;
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readonly UInt16 rangeShift;
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readonly List<TableRecord> tableRecords = new List<TableRecord>();
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public TableDirectory(BinaryReader reader, UInt32 offset) : base(reader, offset) {
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sfntVersion = reader.ReadUInt32();
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numTables = reader.ReadUInt16();
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searchRange = reader.ReadUInt16();
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entrySelector = reader.ReadUInt16();
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rangeShift = reader.ReadUInt16();
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for (int i = 0; i < numTables; i++)
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tableRecords.Add(new TableRecord {
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tableTag = reader.ReadTag(),
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checksum = reader.ReadUInt32(),
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offset = reader.ReadUInt32(),
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length = reader.ReadUInt32(),
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});
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}
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public override IReadOnlyList<TableRecord> GetItems() {
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return tableRecords;
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}
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public override object GetSubTable(TableRecord item) {
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switch (item.tableTag) {
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case "name": return new NameTable(Reader, item.offset);
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default: throw new NotImplementedException();
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}
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}
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}
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public struct TableRecord {
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public string tableTag;
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public UInt32 checksum;
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public UInt32 offset;
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public UInt32 length;
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}
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public sealed class NameTable : FontTable<NameRecord> {
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readonly UInt16 version;
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readonly UInt16 count;
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readonly UInt16 storageOffset;
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readonly List<NameRecord> nameRecord = new List<NameRecord>();
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readonly UInt16 langTagCount;
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readonly List<LangTagRecord> langTagRecord = new List<LangTagRecord>();
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public NameTable(BinaryReader reader, UInt32 offset) : base(reader, offset) {
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version = reader.ReadUInt16();
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count = reader.ReadUInt16();
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storageOffset = reader.ReadUInt16();
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for (UInt16 i = 0; i < count; i++)
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nameRecord.Add(new NameRecord {
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platformID = reader.ReadUInt16(),
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encodingID = reader.ReadUInt16(),
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languageID = reader.ReadUInt16(),
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nameID = (NameID)reader.ReadUInt16(),
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length = reader.ReadUInt16(),
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stringOffset = reader.ReadUInt16(),
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});
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if (version == 1) {
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langTagCount = reader.ReadUInt16();
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for (UInt16 i = 0; i < langTagCount; i++)
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langTagRecord.Add(new LangTagRecord {
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length = reader.ReadUInt16(),
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langTagOffset = reader.ReadUInt16(),
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});
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}
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UInt32 origin = (UInt32)reader.BaseStream.Position;
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for (int i = 0; i < nameRecord.Count; i++) nameRecord[i] = nameRecord[i].Load(reader, origin);
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for (int i = 0; i < langTagRecord.Count; i++) langTagRecord[i] = langTagRecord[i].Load(reader, origin);
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}
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public sealed override IReadOnlyList<NameRecord> GetItems() {
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return nameRecord.Cast<NameRecord>().ToList();
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}
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}
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public struct NameRecord {
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public UInt16 platformID;
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public UInt16 encodingID;
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public UInt16 languageID;
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public NameID nameID;
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public UInt16 length;
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public UInt16 stringOffset;
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public String value { get; private set; }
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public NameRecord Load(BinaryReader reader, UInt32 origin) {
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reader.BaseStream.Position = origin + stringOffset;
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Encoding encoding;
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switch (platformID) {
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case 0: encoding = Encoding.BigEndianUnicode; break;
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case 3: encoding = Encoding.BigEndianUnicode; break;
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default: return this;
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}
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value = encoding.GetString(reader.ReadBytes(length));
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return this;
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}
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}
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public enum NameID : UInt16 {
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CopyrightNotice = 0,
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FontFamilyName = 1,
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FontSubfamilyName = 2,
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UniqueFontIdentifier = 3,
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FullFontName = 4,
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VersionString = 5,
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PostScriptName = 6,
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Trademark = 7,
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ManufacturerName = 8,
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Designer = 9,
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Description = 10,
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URLVendor = 11,
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URLDesigner = 12,
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LicenseDescription = 13,
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LicenseInfoURL = 14,
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TypographicFamilyName = 16,
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TypographicSubfamilyName = 17,
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CompatibleFull = 18,
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SampleText = 19,
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PostScriptCIDFindfontName = 20,
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WWSFamilyName = 21,
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WWSSubfamilyName = 22,
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LightBackgroundPalette = 23,
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DarkBackgroundPalette = 24,
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VariationsPostScriptNamePrefix = 25,
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}
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public struct LangTagRecord {
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public UInt16 length;
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public UInt16 langTagOffset;
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public String value { get; private set; }
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public LangTagRecord Load(BinaryReader reader, UInt32 origin) {
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reader.BaseStream.Position = origin + langTagOffset;
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value = Encoding.BigEndianUnicode.GetString(reader.ReadBytes(length));
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return this;
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}
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}
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public static class BinaryReaderExtensions {
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public static string ReadTag(this BinaryReader reader) {
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return Encoding.ASCII.GetString(reader.ReadBytes(4));
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}
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}
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}
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