/// <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();
}
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;
}
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);
}