ReadFrom() public static method

Creates and reads a TableDirectoryEntry from the font image.
public static ReadFrom ( FontData fontData ) : TableDirectoryEntry
fontData FontData
return TableDirectoryEntry
Example #1
0
        /// <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;
            }
        }
Example #2
0
        /// <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;
            }
        }