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 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); } }