/// <summary>
/// Queues the supplied <see cref="FontTable"/> for writing
/// to the underlying stream.
/// </summary>
/// <remarks>
/// The method will not immediately write the supplied font
/// table to the underlying stream. Instead it queues the
/// font table since the offset table must be written out
/// before any tables.
/// </remarks>
/// <param name="table"></param>
public void Write(FontTable table)
{
if (tables.Contains(table.Name))
{
throw new ArgumentException("Already written table '" + table.Name + "'");
}
tables.Add(table.Name, table);
}
private void WriteFontTable(FontTable table)
{
// Start position required to generate checksum and length
long startPosition = stream.SetRestorePoint();
// FontTable subclass is responsible for writing itself
table.Write(this);
// Align table on 4-byte boundary
int padding = stream.Pad();
// Restore will reset stream position back to startPosition
long endPosition = stream.Restore();
// The table length not including the padding
table.Entry.Length = (uint)(endPosition - startPosition - padding);
table.Entry.Offset = (uint)startPosition;
table.Entry.CheckSum = CalculateCheckSum(table.Entry.Length);
}
/// <summary>
/// Gets a reference to the table structure identified by <i>tableName</i>
/// </summary>
/// <remarks>
/// Only the following tables are supported:
/// <see cref="TableNames.Head"/> - Font header,
/// <see cref="TableNames.Hhea"/> - Horizontal header,
/// <see cref="TableNames.Hmtx"/> - Horizontal metrics,
/// <see cref="TableNames.Maxp"/> - Maximum profile,
/// <see cref="TableNames.Loca"/> - Index to location,
/// <see cref="TableNames.Glyf"/> - Glyf data,
/// <see cref="TableNames.Cvt"/> - Control value,
/// <see cref="TableNames.Prep"/> - Control value program,
/// <see cref="TableNames.Fpgm"/> - Font program
/// </remarks>
/// <param name="tableName">A 4-character code identifying a table.</param>
/// <exception cref="ArgumentException">
/// If <b>tableName</b> does not represent a table in this font.
/// </exception>
internal FontTable GetTable(string tableName)
{
if (!ContainsTable(tableName))
{
throw new ArgumentException("Cannot locate table '" + tableName + "'", "tableName");
}
// Obtain from cache is present
if (tableCache.Contains(tableName))
{
return((FontTable)tableCache[tableName]);
}
// Otherwise instantiate appropriate FontTable subclass and parse
DirectoryEntry tableEntry = GetDictionaryEntry(tableName);
FontTable table = tableEntry.MakeTable(this);
if (table != null)
{
OffsetStream(tableEntry);
table.Read(this);
}
return(table);
}
/// <summary>
/// Queues the supplied <see cref="FontTable"/> for writing
/// to the underlying stream.
/// </summary>
/// <remarks>
/// The method will not immediately write the supplied font
/// table to the underlying stream. Instead it queues the
/// font table since the offset table must be written out
/// before any tables.
/// </remarks>
/// <param name="table"></param>
public void Write(FontTable table) {
if (tables.Contains(table.Name)) {
throw new ArgumentException("Already written table '" + table.Name + "'");
}
tables.Add(table.Name, table);
}
private void WriteFontTable(FontTable table) {
// Start position required to generate checksum and length
long startPosition = stream.SetRestorePoint();
// FontTable subclass is responsible for writing itself
table.Write(this);
// Align table on 4-byte boundary
int padding = stream.Pad();
// Restore will reset stream position back to startPosition
long endPosition = stream.Restore();
// The table length not including the padding
table.Entry.Length = (uint) (endPosition - startPosition - padding);
table.Entry.Offset = (uint) startPosition;
table.Entry.CheckSum = CalculateCheckSum(table.Entry.Length);
}
