private IndexToLocationTable CreateLocaTable(GlyfDataTable glyfTable) {
DirectoryEntry entry = new DirectoryEntry(TableNames.Loca);
IndexToLocationTable loca = new IndexToLocationTable(entry, glyfTable.Count);
uint offset = 0;
for (int i = 0; i < glyfTable.Count; i++) {
loca.AddOffset(offset);
offset += glyfTable[i].Length;
}
// Add trailer offset
loca.AddOffset(offset);
return loca;
}
private HorizontalMetricsTable CreateHmtxTable(GlyfDataTable glyfTable) {
// Fetches horizontal metrics for all glyphs
HorizontalMetricsTable hmtxOld = reader.GetHorizontalMetricsTable();
DirectoryEntry entry = new DirectoryEntry(TableNames.Hmtx);
HorizontalMetricsTable hmtx =
new HorizontalMetricsTable(entry, glyfTable.Count);
// Copy required horizontal metrics.
IndexMappings mappings = reader.IndexMappings;
foreach (int subsetIndex in mappings.SubsetIndices) {
int glyphIndex = mappings.GetGlyphIndex(subsetIndex);
hmtx[subsetIndex] = hmtxOld[glyphIndex].Clone();
}
return hmtx;
}
protected internal void Read(FontFileStream stream) {
// Skip sfnt version (0x00010000 for version 1.0).
stream.Skip(PrimitiveSizes.Fixed);
// Number of tables
int numTables = stream.ReadUShort();
// Skip searchRange, entrySelector and rangeShift entries (3 x ushort)
stream.Skip(PrimitiveSizes.UShort*3);
directoryEntries = new Hashtable(numTables);
for (int i = 0; i < numTables; i++) {
DirectoryEntry entry = new DirectoryEntry(
stream.ReadTag(), // 4-byte identifier.
stream.ReadULong(), // CheckSum for this table.
stream.ReadULong(), // Offset from beginning of TrueType font file.
stream.ReadULong() // Length of this table.
);
directoryEntries.Add(entry.TableName, entry);
}
}
/// <summary>
/// Class constructor.
/// </summary>
/// <param name="entry"></param>
public KerningTable(DirectoryEntry entry)
: base(TableNames.Kern, entry) {}
/// <summary>
/// Class constructor.
/// </summary>
/// <param name="entry"></param>
public PostTable(DirectoryEntry entry) : base(TableNames.Post, entry) {}
/// <summary>
/// Class constructor
/// </summary>
/// <param name="tableName">The table name.</param>
/// <param name="entry">Table directory entry.</param>
public FontTable(string tableName, DirectoryEntry entry) {
this.directoryEntry = entry;
}
/// <summary>
/// Class constructor.
/// </summary>
/// <param name="entry"></param>
public HeaderTable(DirectoryEntry entry)
: base(TableNames.Head, entry) {}
/// <summary>
/// Class constructor.
/// </summary>
/// <param name="entry"></param>
public HorizontalHeaderTable(DirectoryEntry entry) : base(TableNames.Hhea, entry) {}
/// <summary>
/// Initialises a new instance of the
/// <see cref="IndexToLocationTable"/> class.
/// </summary>
/// <param name="entry"></param>
public IndexToLocationTable(DirectoryEntry entry)
: base(TableNames.Loca, entry) {}
/// <summary>
/// Initialises a new instance of the HorizontalMetricsTable class.
/// </summary>
/// <param name="entry"></param>
public HorizontalMetricsTable(DirectoryEntry entry, int numMetrics)
: base(TableNames.Hmtx, entry) {
this.metrics = new ArrayList(numMetrics);
}
/// <summary>
/// Initialises a new instance of the
/// <see cref="HorizontalMetricsTable"/> class.
/// </summary>
/// <param name="entry"></param>
public HorizontalMetricsTable(DirectoryEntry entry)
: base(TableNames.Hmtx, entry) {}
/// <summary>
/// Creates an instance of the <see cref="GlyfDataTable"/> class.
/// </summary>
/// <param name="entry"></param>
public GlyfDataTable(DirectoryEntry entry) : base(TableNames.Glyf, entry) {
this.glyphDescriptions = new SortedList();
}
public NameTable(DirectoryEntry entry)
: base(TableNames.Name, entry) {}
public OS2Table(DirectoryEntry entry) : base(TableNames.Os2, entry) {}
/// <summary>
/// Initialises a new instance of the IndexToLocationTable class.
/// </summary>
/// <param name="entry"></param>
public IndexToLocationTable(DirectoryEntry entry, int numOffsets)
: base(TableNames.Loca, entry) {
this.offsets = new ArrayList(numOffsets);
}
/// <summary>
/// Sets the stream position to the offset in the supplied directory
/// entry. Also ensures that the FontFileStream has enough bytes
/// available to read a font table. Throws an exception if this
/// condition is not met.
/// </summary>
/// <param name="entry"></param>
/// <exception cref="ArgumentException">
/// If the supplied stream does not contain enough data.
/// </exception>
private void OffsetStream(DirectoryEntry entry) {
stream.Position = entry.Offset;
if ((stream.Position + entry.Length) > stream.Length) {
string msg = String.Format(
"Error reading table '{0}'. Expected {1} bytes, current position {2}, stream length {3}",
entry.TableName, entry.Length, stream.Position, stream.Length);
throw new ArgumentException(msg);
}
}
/// <summary>
/// Initialises a new instance of the <see cref="MaximumProfileTable"/>
/// class.
/// </summary>
/// <param name="entry"></param>
public MaximumProfileTable(DirectoryEntry entry) : base(TableNames.Maxp, entry) {}
