private FontHeader ReadHeadTable()
{
if (!_tables.ContainsKey("head"))
{
throw new Exception("Bad font: Header table missing");
}
_file.Seek(_tables["head"].Offset);
var h = new FontHeader();
// DO NOT REARRANGE CALLS!
h.Version = _file.GetFixed();
h.Revision = _file.GetFixed();
h.ChecksumAdjustment = _file.GetUint32();
h.MagicNumber = _file.GetUint32();
if (h.MagicNumber != HeaderMagic)
{
throw new Exception("Bad font: incorrect identifier in header table");
}
h.Flags = _file.GetUint16();
h.UnitsPerEm = _file.GetUint16();
h.Created = _file.GetDate();
h.Modified = _file.GetDate();
h.xMin = _file.GetFWord();
h.yMin = _file.GetFWord();
h.xMax = _file.GetFWord();
h.yMax = _file.GetFWord();
h.MacStyle = _file.GetUint16();
h.LowestRecPPEM = _file.GetUint16();
h.FontDirectionHint = _file.GetInt16();
h.IndexToLocFormat = _file.GetInt16();
h.GlyphDataFormat = _file.GetInt16();
return(h);
}
public TrueTypeFont(string filename)
{
_filename = filename;
_file = new BinaryReader(filename);
_unicodeIndexes = new Dictionary <char, int>();
_glyphCache = new Dictionary <int, Glyph>();
// The order that things are read below is important
// DO NOT REARRANGE CALLS!
_tables = ReadOffsetTables();
_header = ReadHeadTable();
_length = GlyphCount();
if (!_tables.ContainsKey("glyf"))
{
throw new Exception("Bad font: glyf table missing");
}
if (!_tables.ContainsKey("loca"))
{
throw new Exception("Bad font: loca table missing");
}
}