/// <summary> /// Reads all required tables from the font data. /// </summary> internal void Read() { // Determine font technology // ReSharper disable InconsistentNaming const uint OTTO = 0x4f54544f; // Adobe OpenType CFF data, tag: 'OTTO' const uint TTCF = 0x74746366; // TrueType Collection tag: 'ttcf' // ReSharper restore InconsistentNaming try { #if DEBUG_ if (Name == "Cambria") { Debug - Break.Break(); } #endif // Check if data is a TrueType collection font. uint startTag = ReadULong(); if (startTag == TTCF) { _fontTechnology = FontTechnology.TrueTypeCollection; throw new InvalidOperationException("TrueType collection fonts are not yet supported by PDFsharp."); } // Read offset table _offsetTable.Version = startTag; _offsetTable.TableCount = ReadUShort(); _offsetTable.SearchRange = ReadUShort(); _offsetTable.EntrySelector = ReadUShort(); _offsetTable.RangeShift = ReadUShort(); // Move to table dictionary at position 12 Debug.Assert(_pos == 12); //tableDictionary = (offsetTable.TableCount); if (_offsetTable.Version == OTTO) { _fontTechnology = FontTechnology.PostscriptOutlines; } else { _fontTechnology = FontTechnology.TrueTypeOutlines; } for (int idx = 0; idx < _offsetTable.TableCount; idx++) { TableDirectoryEntry entry = TableDirectoryEntry.ReadFrom(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 (TableDictionary.ContainsKey("bhed")) { throw new NotSupportedException("Bitmap fonts are not supported by PDFsharp."); } // Read required tables if (Seek(CMapTable.Tag) != -1) { cmap = new CMapTable(this); } if (Seek(ControlValueTable.Tag) != -1) { cvt = new ControlValueTable(this); } if (Seek(FontProgram.Tag) != -1) { fpgm = new FontProgram(this); } if (Seek(MaximumProfileTable.Tag) != -1) { maxp = new MaximumProfileTable(this); } if (Seek(NameTable.Tag) != -1) { name = new NameTable(this); } if (Seek(FontHeaderTable.Tag) != -1) { head = new FontHeaderTable(this); } if (Seek(HorizontalHeaderTable.Tag) != -1) { hhea = new HorizontalHeaderTable(this); } if (Seek(HorizontalMetricsTable.Tag) != -1) { hmtx = new HorizontalMetricsTable(this); } if (Seek(OS2Table.Tag) != -1) { os2 = new OS2Table(this); } if (Seek(PostScriptTable.Tag) != -1) { post = new PostScriptTable(this); } if (Seek(GlyphDataTable.Tag) != -1) { glyf = new GlyphDataTable(this); } if (Seek(IndexToLocationTable.Tag) != -1) { loca = new IndexToLocationTable(this); } if (Seek(GlyphSubstitutionTable.Tag) != -1) { gsub = new GlyphSubstitutionTable(this); } if (Seek(ControlValueProgram.Tag) != -1) { prep = new ControlValueProgram(this); } } catch (Exception) { GetType(); throw; } }
/// <summary> /// Source: https://forum.pdfsharp.net/viewtopic.php?p=9039 /// </summary> internal void CorrectOffsetForTTC() { _pos = 0; string sTTCTag = this.ReadString(4); if (sTTCTag != "ttcf") { _pos = 0; // Reset offset return; } uint uiVersion = this.ReadULong(); uint uiFontCount = this.ReadULong(); bool bFoundFont = false; for (uint uiFontIndex = 0; uiFontIndex < uiFontCount; ++uiFontIndex) { _pos = (int)(12 + (uiFontIndex * 4)); _pos = (int)this.ReadULong(); // Read offset table uint nTempVersion = ReadULong(); uint nTempTableCount = ReadUShort(); uint nTempSearchRange = ReadUShort(); uint nTempEntrySelector = ReadUShort(); uint nTempRangeShift = ReadUShort(); TableDirectoryEntry nameTableEntry = null; for (int idx = 0; idx < nTempTableCount; idx++) { TableDirectoryEntry entry = TableDirectoryEntry.ReadFrom(this); if (entry.Tag == NameTable.Tag) { nameTableEntry = entry; break; } } if (nameTableEntry != null) { _pos = nameTableEntry.Offset; TableDictionary.Add(nameTableEntry.Tag, nameTableEntry); // Add for create NameTable NameTable nametbl = new NameTable(this); TableDictionary.Remove(nameTableEntry.Tag); // clear after used if (nametbl.Name == FontSource.FontName) { // Found font _pos = (int)(12 + (uiFontIndex * 4)); _pos = (int)this.ReadULong(); bFoundFont = true; break; } } } if (!bFoundFont) { _pos = 0; } }