/// <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;
}
}
