public ObjectToken WriteFont(NameToken fontKeyName, Stream outputStream, BuilderContext context)
{
var newEncoding = new TrueTypeSubsetEncoding(characterMapping.Keys.ToList());
var subsetBytes = TrueTypeSubsetter.Subset(fontFileBytes.ToArray(), newEncoding);
var embeddedFile = DataCompresser.CompressToStream(subsetBytes);
var fileRef = context.WriteObject(outputStream, embeddedFile);
var baseFont = NameToken.Create(font.TableRegister.NameTable.GetPostscriptName());
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)FontDescriptorFlags.Symbolic) },
{ NameToken.FontBbox, GetBoundingBox(bbox, scaling) },
{ NameToken.ItalicAngle, new NumericToken((decimal)postscript.ItalicAngle) },
{ NameToken.Ascent, new NumericToken(Math.Round(hhead.Ascent * scaling, 2)) },
{ NameToken.Descent, new NumericToken(Math.Round(hhead.Descent * scaling, 2)) },
{ NameToken.CapHeight, new NumericToken(90) },
{ NameToken.StemV, new NumericToken(90) },
{ NameToken.FontFile2, new IndirectReferenceToken(fileRef.Number) }
};
var os2 = font.TableRegister.Os2Table;
if (os2 == null)
{
throw new InvalidFontFormatException("Embedding TrueType font requires OS/2 table.");
}
if (os2 is Os2Version2To4OpenTypeTable twoPlus)
{
descriptorDictionary[NameToken.CapHeight] = new NumericToken(twoPlus.CapHeight);
descriptorDictionary[NameToken.Xheight] = new NumericToken(twoPlus.XHeight);
}
descriptorDictionary[NameToken.StemV] = new NumericToken(((decimal)bbox.Width) * scaling * 0.13m);
var lastCharacter = 0;
var widths = new List <NumericToken> {
NumericToken.Zero
};
foreach (var kvp in characterMapping)
{
if (kvp.Value > lastCharacter)
{
lastCharacter = kvp.Value;
}
var glyphId = font.WindowsUnicodeCMap.CharacterCodeToGlyphIndex(kvp.Key);
var width = decimal.Round(font.TableRegister.HorizontalMetricsTable.GetAdvanceWidth(glyphId) * scaling, 2);
widths.Add(new NumericToken(width));
}
var descriptor = context.WriteObject(outputStream, new DictionaryToken(descriptorDictionary));
var toUnicodeCMap = ToUnicodeCMapBuilder.ConvertToCMapStream(characterMapping);
var toUnicodeStream = DataCompresser.CompressToStream(toUnicodeCMap);
var toUnicode = context.WriteObject(outputStream, toUnicodeStream);
var dictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Font },
{ NameToken.Subtype, NameToken.TrueType },
{ NameToken.BaseFont, baseFont },
{ NameToken.FontDescriptor, new IndirectReferenceToken(descriptor.Number) },
{ NameToken.FirstChar, new NumericToken(0) },
{ NameToken.LastChar, new NumericToken(lastCharacter) },
{ NameToken.Widths, new ArrayToken(widths) },
{ NameToken.ToUnicode, new IndirectReferenceToken(toUnicode.Number) }
};
var token = new DictionaryToken(dictionary);
var result = context.WriteObject(outputStream, token);
return(result);
}