/// <summary>
/// Writes the font subset to the supplied output stream.
/// </summary>
public void Generate(MemoryStream output)
{
HeaderTable head = reader.GetHeaderTable();
MaximumProfileTable maxp = reader.GetMaximumProfileTable();
HorizontalHeaderTable hhea = reader.GetHorizontalHeaderTable();
ControlValueTable cvt = reader.GetControlValueTable();
FontProgramTable fpgm = reader.GetFontProgramTable();
GlyfDataTable glyf = reader.GetGlyfDataTable();
ControlValueProgramTable prep = reader.GetControlValueProgramTable();
IndexToLocationTable loca = CreateLocaTable(glyf);
HorizontalMetricsTable hmtx = CreateHmtxTable(glyf);
// Since we're reusing the hhea and maxp tables, we must update
// the numberOfHMetrics and numGlyphs fields to reflect the reduced
// number of glyphs.
maxp.GlyphCount = glyf.Count;
hhea.HMetricCount = glyf.Count;
FontFileWriter writer = new FontFileWriter(output);
writer.Write(head);
writer.Write(maxp);
writer.Write(hhea);
writer.Write(hmtx);
writer.Write(cvt);
writer.Write(prep);
writer.Write(fpgm);
writer.Write(loca);
writer.Write(glyf);
writer.Close();
}
/// <summary>
/// Updates the checkSumAdjustment field in the head table.
/// </summary>
private void WriteChecksumAdjustment()
{
HeaderTable head = (HeaderTable)tables[TableNames.Head];
// Move to beginning of head table and skip the version no and
// font revision no fields.
stream.Position = head.Entry.Offset + 2 * PrimitiveSizes.Fixed;
stream.WriteULong(CalculateCheckSumAdjustment());
}
private void EnsureHeadTable() {
if (head == null) {
head = (HeaderTable) GetTable(TableNames.Head);
}
}