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#21 start constructing font objects for truetype embedding

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This commit is contained in:
Eliot Jones
2018-12-04 20:14:24 +00:00
parent d6a896dcb0
commit 77311aa6c6
11 changed files with 182 additions and 38 deletions
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2
src/UglyToad.PdfPig/Fonts/Parser/FontDictionaryAccessHelper.cs
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@@ -56,7 +56,7 @@
public static FontDescriptor GetFontDescriptor(IPdfTokenScanner pdfScanner, FontDescriptorFactory fontDescriptorFactory, DictionaryToken dictionary,
bool isLenientParsing)
{
if (!dictionary.TryGet(NameToken.FontDesc, out var obj))
if (!dictionary.TryGet(NameToken.FontDescriptor, out var obj))
{
throw new InvalidFontFormatException($"No font descriptor indirect reference found in the TrueType font: {dictionary}.");
}

2
src/UglyToad.PdfPig/Fonts/Parser/Parts/CidFontFactory.cs
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@@ -73,7 +73,7 @@
{
descriptorDictionary = null;
if (!dictionary.TryGet(NameToken.FontDesc, out var baseValue))
if (!dictionary.TryGet(NameToken.FontDescriptor, out var baseValue))
{
return false;
}

63
src/UglyToad.PdfPig/Fonts/TrueType/Parser/TableParser.cs Normal file
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@@ -0,0 +1,63 @@
namespace UglyToad.PdfPig.Fonts.TrueType.Parser
{
using System;
using Tables;
internal static class TableParser
{
private static readonly Os2TableParser Os2TableParser = new Os2TableParser();
public static T Parse<T>(TrueTypeHeaderTable table, TrueTypeDataBytes data, TableRegister.Builder register) where T : ITable
{
if (typeof(T) == typeof(Os2Table))
{
return (T)(object)Os2TableParser.Parse(table, data, register);
}
throw new NotImplementedException();
}
}
internal class Os2TableParser : ITrueTypeTableParser<Os2Table>
{
public Os2Table Parse(TrueTypeHeaderTable header, TrueTypeDataBytes data, TableRegister.Builder register)
{
data.Seek(header.Offset);
var version = data.ReadUnsignedShort();
var xAvgCharWidth = data.ReadSignedShort();
var usWeightClass = data.ReadUnsignedShort();
var usWidthClass = data.ReadUnsignedShort();
var fsType = data.ReadSignedShort();
var ySubscriptXSize = data.ReadSignedShort();
var ySubscriptYSize = data.ReadSignedShort();
var ySubscriptXOffset = data.ReadSignedShort();
var ySubscriptYOffset = data.ReadSignedShort();
var ySuperscriptXSize = data.ReadSignedShort();
var ySuperscriptYSize = data.ReadSignedShort();
var ySuperscriptXOffset = data.ReadSignedShort();
var ySuperscriptYOffset = data.ReadSignedShort();
var yStrikeoutSize = data.ReadSignedShort();
var yStrikeoutPosition = data.ReadSignedShort();
var sFamilyClass = data.ReadSignedShort();
var panose = data.ReadByteArray(10);
var ulCharRange1 = data.ReadUnsignedInt();
var ulCharRange2 = data.ReadUnsignedInt();
var ulCharRange3 = data.ReadUnsignedInt();
var ulCharRange4 = data.ReadUnsignedInt();
var vendorId = data.ReadByteArray(4);
var fsSelection = data.ReadUnsignedShort();
var fsFirstCharIndex = data.ReadUnsignedShort();
var fsLastCharIndex = data.ReadUnsignedShort();
var bytesRead = data.Position - header.Offset;
return null;
}
}
internal interface ITrueTypeTableParser<out T> where T : ITable
{
T Parse(TrueTypeHeaderTable header, TrueTypeDataBytes data, TableRegister.Builder register);
}
}

5
src/UglyToad.PdfPig/Fonts/TrueType/Parser/TableRegister.cs
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@@ -59,6 +59,8 @@
public KerningTable KerningTable { get; }
public Os2Table Os2Table { get; }
/// <summary>
/// Create a new <see cref="TableRegister"/>.
/// </summary>
@@ -80,6 +82,7 @@
PostScriptTable = builder.PostScriptTable;
CMapTable = builder.CMapTable;
KerningTable = builder.KerningTable;
Os2Table = builder.Os2Table;
}
/// <summary>
@@ -112,6 +115,8 @@
public NameTable NameTable { get; set; }
public Os2Table Os2Table { get; set; }
public TableRegister Build()
{
return new TableRegister(this);

5
src/UglyToad.PdfPig/Fonts/TrueType/Parser/TrueTypeFontParser.cs
View File

@@ -94,6 +94,11 @@
{
builder.NameTable = NameTable.Load(data, nameTable);
}
if (tables.TryGetValue(TrueTypeHeaderTable.Os2, out var os2Table))
{
builder.Os2Table = TableParser.Parse<Os2Table>(os2Table, data, builder);
}
if (!isPostScript)
{

9
src/UglyToad.PdfPig/Fonts/TrueType/Tables/Os2Table.cs Normal file
View File

@@ -0,0 +1,9 @@
namespace UglyToad.PdfPig.Fonts.TrueType.Tables
{
internal class Os2Table : ITable
{
public string Tag => TrueTypeHeaderTable.Os2;
public TrueTypeHeaderTable DirectoryTable { get; }
}
}

2
src/UglyToad.PdfPig/Tokens/NameToken.Constants.cs
View File

@@ -214,7 +214,7 @@
public static readonly NameToken FlateDecodeAbbreviation = new NameToken("Fl");
public static readonly NameToken Font = new NameToken("Font");
public static readonly NameToken FontBbox = new NameToken("FontBBox");
public static readonly NameToken FontDesc = new NameToken("FontDescriptor");
public static readonly NameToken FontDescriptor = new NameToken("FontDescriptor");
public static readonly NameToken FontFamily = new NameToken("FontFamily");
public static readonly NameToken FontFile = new NameToken("FontFile");
public static readonly NameToken FontFile2 = new NameToken("FontFile2");

3
src/UglyToad.PdfPig/Writer/IWritingFont.cs
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@@ -1,6 +1,7 @@
namespace UglyToad.PdfPig.Writer
{
using System.Collections.Generic;
using System.IO;
using Geometry;
using Tokens;
@@ -10,6 +11,6 @@
bool TryGetBoundingBox(char character, out PdfRectangle boundingBox);
IReadOnlyDictionary<IToken, IToken> GetDictionary(NameToken fontKeyName);
ObjectToken WriteFont(NameToken fontKeyName, Stream outputStream, BuilderContext context);
}
}

38
src/UglyToad.PdfPig/Writer/PdfDocumentBuilder.cs
View File

@@ -34,7 +34,7 @@
var id = Guid.NewGuid();
var i = fonts.Count;
var added = new AddedFont(id, NameToken.Create($"F{i}"));
fonts[id] = new FontStored(added, new TrueTypeWritingFont(font));
fonts[id] = new FontStored(added, new TrueTypeWritingFont(font, fontFileBytes));
return added;
}
@@ -99,9 +99,8 @@
public byte[] Build()
{
var objectLocations = new Dictionary<IndirectReference, long>();
var context = new BuilderContext();
var fontsWritten = new Dictionary<Guid, ObjectToken>();
var number = 1;
using (var memory = new MemoryStream())
{
// Header
@@ -110,14 +109,7 @@
// Body
foreach (var font in fonts)
{
var fontDictionary = font.Value.FontProgram.GetDictionary(font.Value.FontKey.Name);
// TODO
// var descriptorRef = new IndirectReference(number++, 0);
var dictionary = new DictionaryToken(fontDictionary);
var fontObj = WriteObject(dictionary, memory, objectLocations, ref number);
var fontObj = font.Value.FontProgram.WriteFont(font.Value.FontKey.Name, memory, context);
fontsWritten.Add(font.Key, fontObj);
}
@@ -131,7 +123,7 @@
var fontsDictionary = new DictionaryToken(fontsWritten.Select(x => ((IToken)fonts[x.Key].FontKey.Name, (IToken)new IndirectReferenceToken(x.Value.Number)))
.ToDictionary(x => x.Item1, x => x.Item2));
var fontsDictionaryRef = WriteObject(fontsDictionary, memory, objectLocations, ref number);
var fontsDictionaryRef = context.WriteObject(memory, fontsDictionary);
resources.Add(NameToken.Font, new IndirectReferenceToken(fontsDictionaryRef.Number));
}
@@ -153,12 +145,12 @@
{
var contentStream = WriteContentStream(page.Value.Operations);
var contentStreamObj = WriteObject(contentStream, memory, objectLocations, ref number);
var contentStreamObj = context.WriteObject(memory, contentStream);
pageDictionary[NameToken.Contents] = new IndirectReferenceToken(contentStreamObj.Number);
}
var pageRef = WriteObject(new DictionaryToken(pageDictionary), memory, objectLocations, ref number);
var pageRef = context.WriteObject(memory, new DictionaryToken(pageDictionary));
pageReferences.Add(new IndirectReferenceToken(pageRef.Number));
}
@@ -170,7 +162,7 @@
{ NameToken.Count, new NumericToken(1) }
});
var pagesRef = WriteObject(pagesDictionary, memory, objectLocations, ref number);
var pagesRef = context.WriteObject(memory, pagesDictionary);
var catalog = new DictionaryToken(new Dictionary<IToken, IToken>
{
@@ -178,9 +170,9 @@
{ NameToken.Pages, new IndirectReferenceToken(pagesRef.Number) }
});
var catalogRef = WriteObject(catalog, memory, objectLocations, ref number);
var catalogRef = context.WriteObject(memory, catalog);
TokenWriter.WriteCrossReferenceTable(objectLocations, catalogRef, memory);
TokenWriter.WriteCrossReferenceTable(context.ObjectOffsets, catalogRef, memory);
return memory.ToArray();
}
@@ -218,17 +210,7 @@
new NumericToken(rectangle.TopRight.Y)
});
}
private static ObjectToken WriteObject(IToken content, Stream stream, Dictionary<IndirectReference, long> objectOffsets, ref int number)
{
var reference = new IndirectReference(number++, 0);
var obj = new ObjectToken(stream.Position, reference, content);
objectOffsets.Add(reference, obj.Position);
// TODO: write
TokenWriter.WriteToken(obj, stream);
return obj;
}
private static void WriteString(string text, MemoryStream stream, bool appendBreak = true)
{
var bytes = OtherEncodings.StringAsLatin1Bytes(text);

28
src/UglyToad.PdfPig/Writer/Standard14WritingFont.cs
View File

@@ -1,6 +1,7 @@
namespace UglyToad.PdfPig.Writer
{
using System.Collections.Generic;
using System.IO;
using Fonts;
using Fonts.Encodings;
using Geometry;
@@ -32,9 +33,9 @@
return true;
}
public IReadOnlyDictionary<IToken, IToken> GetDictionary(NameToken fontKeyName)
public ObjectToken WriteFont(NameToken fontKeyName, Stream outputStream, BuilderContext context)
{
return new Dictionary<IToken, IToken>
var dictionary = new Dictionary<IToken, IToken>
{
{ NameToken.Type, NameToken.Font },
{ NameToken.Subtype, NameToken.Type1 },
@@ -42,6 +43,29 @@
{ NameToken.Encoding, NameToken.MacRomanEncoding },
{ NameToken.Name, fontKeyName }
};
var token = new DictionaryToken(dictionary);
var result = context.WriteObject(outputStream, token);
return result;
}
}
internal class BuilderContext
{
public int CurrentNumber { get; private set; } = 1;
private Dictionary<IndirectReference, long> objectOffsets = new Dictionary<IndirectReference, long>();
public IReadOnlyDictionary<IndirectReference, long> ObjectOffsets => objectOffsets;
public ObjectToken WriteObject(Stream stream, IToken token)
{
var reference = new IndirectReference(CurrentNumber++, 0);
var obj = new ObjectToken(stream.Position, reference, token);
objectOffsets.Add(reference, obj.Position);
TokenWriter.WriteToken(obj, stream);
return obj;
}
}
}

63
src/UglyToad.PdfPig/Writer/TrueTypeWritingFont.cs
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@@ -1,6 +1,8 @@
namespace UglyToad.PdfPig.Writer
{
using System.Collections.Generic;
using System.IO;
using Fonts;
using Fonts.TrueType;
using Geometry;
using Tokens;
@@ -8,10 +10,12 @@
internal class TrueTypeWritingFont : IWritingFont
{
private readonly TrueTypeFontProgram font;
private readonly IReadOnlyList<byte> fontFileBytes;
public TrueTypeWritingFont(TrueTypeFontProgram font)
public TrueTypeWritingFont(TrueTypeFontProgram font, IReadOnlyList<byte> fontFileBytes)
{
this.font = font;
this.fontFileBytes = fontFileBytes;
}
public bool HasWidths { get; } = true;
@@ -21,13 +25,64 @@
return font.TryGetBoundingBox(character, out boundingBox);
}
public IReadOnlyDictionary<IToken, IToken> GetDictionary(NameToken fontKeyName)
public ObjectToken WriteFont(NameToken fontKeyName, Stream outputStream, BuilderContext context)
{
return new Dictionary<IToken, IToken>
var bytes = fontFileBytes;
var embeddedFile = new StreamToken(new DictionaryToken(new Dictionary<IToken, IToken>
{
{ NameToken.Length, new NumericToken(bytes.Count) }
}), bytes);
var fileRef = context.WriteObject(outputStream, embeddedFile);
var baseFont = NameToken.Create(font.TableRegister.NameTable.FontName);
var postscript = font.TableRegister.PostScriptTable;
var hhead = font.TableRegister.HorizontalHeaderTable;
var bbox = font.TableRegister.HeaderTable.Bounds;
var scaling = 1000m / font.TableRegister.HeaderTable.UnitsPerEm;
var descriptorDictionary = new Dictionary<NameToken, IToken>
{
{ NameToken.Type, NameToken.FontDescriptor },
{ NameToken.FontName, baseFont },
// TODO: get flags TrueTypeEmbedder.java
{ NameToken.Flags, new NumericToken((int)FontFlags.Symbolic) },
{ NameToken.FontBbox, GetBoundingBox(bbox, scaling) },
{ NameToken.ItalicAngle, new NumericToken(postscript.ItalicAngle) },
{ NameToken.Ascent, new NumericToken(hhead.Ascender * scaling) },
{ NameToken.Descent, new NumericToken(hhead.Descender * scaling) },
// TODO: cap, x height, stem v
{ NameToken.CapHeight, new NumericToken(90) },
{ NameToken.StemV, new NumericToken(90) },
// TODO: font file 2
{ NameToken.FontFile2, new IndirectReferenceToken(fileRef.Number) }
};
var dictionary = new Dictionary<IToken, IToken>
{
{ NameToken.Type, NameToken.Font },
{ NameToken.Subtype, NameToken.TrueType }
{ NameToken.Subtype, NameToken.TrueType },
{ NameToken.BaseFont, baseFont },
};
var token = new DictionaryToken(dictionary);
var result = context.WriteObject(outputStream, token);
return result;
}
private static ArrayToken GetBoundingBox(PdfRectangle boundingBox, decimal scaling)
{
return new ArrayToken(new[]
{
new NumericToken(boundingBox.Left * scaling),
new NumericToken(boundingBox.Bottom * scaling),
new NumericToken(boundingBox.Right * scaling),
new NumericToken(boundingBox.Top * scaling)
});
}
}
}