private TrueTypeFontTable ReadHorizontalMetrics(uint length, TrueTypeTableEntryList list, BigEndianReader reader)
{
var pos = reader.Position;
//Get the number of entries for the hMetrics list from the horizontal header table.
TrueTypeTableEntry hhead = list["hhea"];
if (hhead == null)
{
throw new ArgumentNullException("No horizontal header (hhea) has been specified in the font file, this is needed to load the hroizontal metrics");
}
if (hhead.Table == null)
{
TrueTypeFontTable tbl = this.ReadTable(hhead, list, reader);
if (tbl == null)
{
throw new ArgumentNullException("No horizontal header (hhea) has been specified in the font file, this is needed to load the hroizontal metrics");
}
hhead.SetTable(tbl);
}
TrueTypeTableEntry os2 = list["OS/2"];
if (os2 == null)
{
throw new ArgumentNullException("No OS2 table has been specified in the font file, this is a required table and needed to load the horizontal metrics");
}
if (os2.Table == null)
{
TrueTypeFontTable tbl = this.ReadTable(os2, list, reader);
if (tbl == null)
{
throw new ArgumentNullException("No OS/2 has been specified in the font file, this is needed to load the hroizontal metrics");
}
os2.SetTable(tbl);
}
if (reader.Position != pos)
{
reader.Position = pos;
}
int firstcharindex = (os2.Table as OS2Table).FirstCharIndex;
HorizontalMetrics hm = new HorizontalMetrics(reader.Position);
ushort count = (hhead.Table as SubTables.HorizontalHeader).NumberOfHMetrics;
List <HMetric> metrics = new List <HMetric>();
for (int i = 0; i < count; i++)
{
SubTables.HMetric metric = new HMetric(reader.ReadUInt16(), reader.ReadInt16(), (char)(i + firstcharindex));
metrics.Add(metric);
}
hm.HMetrics = metrics;
return(hm);
}
protected virtual ITypefaceFont ReadFile(TrueTypeHeader header, IEnumerable <TrueTypeTableEntry> dirs, BigEndianReader reader, long startOffset, IFontInfo reference)
{
var entries = new TrueTypeTableEntryList(dirs);
TrueTypeFile file = new TrueTypeFile(header, entries);
TrueTypeTableFactory factory = this.GetTableFactory();
foreach (TrueTypeTableEntry dir in dirs)
{
TrueTypeFontTable tbl = factory.ReadTable(dir, entries, reader);
if (tbl != null)
{
dir.SetTable(tbl);
}
}
file.EnsureReferenceMatched(reference);
byte[] data = CopyStreamData(reader.BaseStream, startOffset);
file.SetFileData(data, this.DataFormat);
return(file);
}
public bool TryGetTable(string name, out TrueTypeFontTable table)
{
if (null == this.Tables)
{
table = null;
return(false);
}
else
{
return(this.Tables.TryGetTable(name, out table));
}
}
public bool TryGetTable(string name, out TrueTypeFontTable table)
{
if (this._directories.Contains(name))
{
table = _directories[name].Table;
}
else
{
table = null;
}
return(null != table);
}
protected void Read(BigEndianReader reader)
{
TrueTypeHeader header;
if (TrueTypeHeader.TryReadHeader(reader, out header) == false)
{
throw new NotSupportedException("The current stream is not a supported OpenType or TrueType font file");
}
List <TrueTypeTableEntry> dirs;
try
{
dirs = new List <TrueTypeTableEntry>();
for (int i = 0; i < header.NumberOfTables; i++)
{
TrueTypeTableEntry dir = new TrueTypeTableEntry();
dir.Read(reader);
dirs.Add(dir);
}
dirs.Sort(delegate(TrueTypeTableEntry one, TrueTypeTableEntry two) { return(one.Offset.CompareTo(two.Offset)); });
this._dirs = new TrueTypeTableEntryList(dirs);
this._head = header;
TrueTypeTableFactory factory = this.GetFactory(header);
foreach (TrueTypeTableEntry dir in dirs)
{
TrueTypeFontTable tbl = factory.ReadTable(dir, this, reader);
if (tbl != null)
{
dir.SetTable(tbl);
}
}
}
catch (Exception ex) { throw new TypefaceReadException("Could not read the TTF File", ex); }
}
internal void SetTable(TrueTypeFontTable tbl)
{
this._tbl = tbl;
}
