/// <summary>
/// Reads the contents of the "kern" table from the current position
/// in the supplied stream.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader)
{
FontFileStream stream = reader.Stream;
// Skip version field
stream.Skip(PrimitiveSizes.UShort);
// Number of subtables
int numTables = stream.ReadUShort();
for (int i = 0; i < numTables; i++)
{
// Another pesky version field
stream.Skip(PrimitiveSizes.UShort);
// Length of the subtable, in bytes (including header).
ushort length = stream.ReadUShort();
// Type of information is contained in this table.
ushort coverage = stream.ReadUShort();
// Only interested in horiztonal kerning values in format 0
if ((coverage & HoriztonalMask) == 1 &&
(coverage & MinimumMask) == 0 &&
((coverage >> 8) == 0))
{
// The number of kerning pairs in the table.
int numPairs = stream.ReadUShort();
hasKerningInfo = true;
pairs = new KerningPairs(numPairs);
// Skip pointless shit
stream.Skip(3 * PrimitiveSizes.UShort);
for (int j = 0; j < numPairs; j++)
{
pairs.Add(
stream.ReadUShort(), // Left glyph index
stream.ReadUShort(), // Right glyph index
stream.ReadFWord()); // Kerning amount
}
}
else
{
stream.Skip(length - 3 * PrimitiveSizes.UShort);
}
}
}
/// <summary>
/// Reads the contents of the "kern" table from the current position
/// in the supplied stream.
/// </summary>
/// <param name="reader"></param>
protected internal override void Read(FontFileReader reader) {
FontFileStream stream = reader.Stream;
// Skip version field
stream.Skip(PrimitiveSizes.UShort);
// Number of subtables
int numTables = stream.ReadUShort();
for (int i = 0; i < numTables; i++) {
// Another pesky version field
stream.Skip(PrimitiveSizes.UShort);
// Length of the subtable, in bytes (including header).
ushort length = stream.ReadUShort();
// Type of information is contained in this table.
ushort coverage = stream.ReadUShort();
// Only interested in horiztonal kerning values in format 0
if ((coverage & HoriztonalMask) == 1 &&
(coverage & MinimumMask) == 0 &&
((coverage >> 8) == 0)) {
// The number of kerning pairs in the table.
int numPairs = stream.ReadUShort();
hasKerningInfo = true;
pairs = new KerningPairs(numPairs);
// Skip pointless shit
stream.Skip(3*PrimitiveSizes.UShort);
for (int j = 0; j < numPairs; j++) {
pairs.Add(
stream.ReadUShort(), // Left glyph index
stream.ReadUShort(), // Right glyph index
stream.ReadFWord()); // Kerning amount
}
}
else {
stream.Skip(length - 3*PrimitiveSizes.UShort);
}
}
}
/// <summary>
/// Class constructor.
/// </summary>
/// <param name="pairs">Kerning pairs read from the TrueType font file.</param>
/// <param name="converter">Class to convert from TTF to PDF units.</param>
internal GdiKerningPairs(KerningPairs pairs, PdfUnitConverter converter) {
this.pairs = pairs;
this.converter = converter;
}