/// <summary> /// Creates and reads a TableDirectoryEntry from the font image. /// </summary> public static TableDirectoryEntry ReadFrom(FontData fontData) { TableDirectoryEntry entry = new TableDirectoryEntry(); entry.Tag = fontData.ReadTag(); entry.CheckSum = fontData.ReadULong(); entry.Offset = fontData.ReadLong(); entry.Length = (int)fontData.ReadULong(); return(entry); }
/// <summary> /// Compiles the font to its binary representation. /// </summary> void Compile() { MemoryStream stream = new MemoryStream(); TrueTypeFontWriter writer = new TrueTypeFontWriter(stream); int tableCount = this.tableDictionary.Count; int selector = entrySelectors[tableCount]; this.offsetTable.Version = 0x00010000; this.offsetTable.TableCount = tableCount; this.offsetTable.SearchRange = (ushort)((1 << selector) * 16); this.offsetTable.EntrySelector = (ushort)selector; this.offsetTable.RangeShift = (ushort)((tableCount - (1 << selector)) * 16); this.offsetTable.Write(writer); // Sort tables by tag name string[] tags = new string[tableCount]; this.tableDictionary.Keys.CopyTo(tags, 0); Array.Sort <string>(tags, StringComparer.Ordinal); #if VERBOSE Debug.WriteLine("Start Compile"); #endif // Write tables in alphabetical order int tablePosition = 12 + 16 * tableCount; for (int idx = 0; idx < tableCount; idx++) { TableDirectoryEntry entry = this.tableDictionary[tags[idx]]; #if DEBUG if (entry.Tag == "glyf" || entry.Tag == "loca") { GetType(); } #endif entry.FontTable.PrepareForCompilation(); entry.Offset = tablePosition; writer.Position = tablePosition; entry.FontTable.Write(writer); int endPosition = writer.Position; tablePosition = endPosition; writer.Position = 12 + 16 * idx; entry.Write(writer); #if VERBOSE Debug.WriteLine(String.Format(" Write Table '{0}', offset={1}, length={2}, checksum={3}, ", entry.Tag, entry.Offset, entry.Length, entry.CheckSum)); #endif } #if VERBOSE Debug.WriteLine("End Compile"); #endif writer.Stream.Flush(); int l = (int)writer.Stream.Length; l.GetType(); this.data = stream.ToArray(); }
/// <summary> /// Reads all required tables from the font data. /// </summary> internal void Read() { try { // Read offset table this.offsetTable.Version = ReadULong(); this.offsetTable.TableCount = ReadUShort(); this.offsetTable.SearchRange = ReadUShort(); this.offsetTable.EntrySelector = ReadUShort(); this.offsetTable.RangeShift = ReadUShort(); // Move to table dictionary at position 12 Debug.Assert(this.pos == 12); //this.tableDictionary = (this.offsetTable.TableCount); for (int idx = 0; idx < this.offsetTable.TableCount; idx++) { TableDirectoryEntry entry = TableDirectoryEntry.ReadFrom(this); this.tableDictionary.Add(entry.Tag, entry); #if VERBOSE Debug.WriteLine(String.Format("Font table: {0}", entry.Tag)); #endif } // PDFlib checks this, but it is not part of the OpenType spec anymore if (this.tableDictionary.ContainsKey("bhed")) { throw new NotSupportedException("Bitmap fonts are not supported by PDFsharp."); } // Read required tables if (Seek(CMapTable.Tag) != -1) { this.cmap = new CMapTable(this); } if (Seek(ControlValueTable.Tag) != -1) { this.cvt = new ControlValueTable(this); } if (Seek(FontProgram.Tag) != -1) { this.fpgm = new FontProgram(this); } if (Seek(MaximumProfileTable.Tag) != -1) { this.maxp = new MaximumProfileTable(this); } if (Seek(NameTable.Tag) != -1) { this.name = new NameTable(this); } if (Seek(FontHeaderTable.Tag) != -1) { this.head = new FontHeaderTable(this); } if (Seek(HorizontalHeaderTable.Tag) != -1) { this.hhea = new HorizontalHeaderTable(this); } if (Seek(HorizontalMetricsTable.Tag) != -1) { this.hmtx = new HorizontalMetricsTable(this); } if (Seek(OS2Table.Tag) != -1) { this.os2 = new OS2Table(this); } if (Seek(PostScriptTable.Tag) != -1) { this.post = new PostScriptTable(this); } if (Seek(GlyphDataTable.Tag) != -1) { this.glyf = new GlyphDataTable(this); } if (Seek(IndexToLocationTable.Tag) != -1) { this.loca = new IndexToLocationTable(this); } if (Seek(GlyphSubstitutionTable.Tag) != -1) { this.gsub = new GlyphSubstitutionTable(this); } if (Seek(ControlValueProgram.Tag) != -1) { this.prep = new ControlValueProgram(this); } } catch (Exception ex) { throw ex; } }