private IGlyphTransformationTable ParseSingleSubstitutionTable(int subTableOffset, dynamic fontTable, LookupFlags lookupFlags)
{
var type = typeof(GlyphTypeface).Assembly.GetType("MS.Internal.Shaping.SingleSubstitutionSubtable");
dynamic table = new AccessPrivateWrapper(type.Instantiate(subTableOffset));
ushort format = table.Format(fontTable.Wrapped);
switch (format)
{
case 1:
return(new DeltaSubstitutionTable
{
Coverage = this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.Coverage(fontTable.Wrapped))),
GlyphIdDelta = (short)table.Format1DeltaGlyphId(fontTable.Wrapped),
LookupFlags = lookupFlags
});
case 2:
var coverage = (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.Coverage(fontTable.Wrapped)));
return(new SimpleReplacementSubstitutionTable
{
Coverage = coverage,
ReplacementGlyphIds =
coverage.CoveredGlyphIds.Keys
.Select(coverageIndex => (ushort)table.Format2SubstituteGlyphId(fontTable.Wrapped, coverageIndex)).ToList(),
LookupFlags = lookupFlags
});
default:
throw new UnknownTableFormatException(type, format);
}
}