private IGlyphTransformationTable ParsePairPositioningTable(int subTableOffset, dynamic fontTable, LookupFlags lookupFlags)
{
var type = typeof(GlyphTypeface).Assembly.GetType("MS.Internal.Shaping.PairPositioningSubtable");
dynamic table = new AccessPrivateWrapper(type.Instantiate(subTableOffset));
ushort format = table.Format(fontTable.Wrapped);
var coverage = (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.Coverage(fontTable.Wrapped)));
var coveredGlyphCount = coverage.CoveredGlyphIds.Count();
switch (format)
{
case 1:
var pairSetTables = this.GetEnumerableFromInternalList(
() => (ushort)coveredGlyphCount,
i => (dynamic) new AccessPrivateWrapper(table.Format1PairSet(fontTable.Wrapped, i))).ToList();
return(new GlyphPairPositioningTable
{
Coverage = coverage,
PairSets =
pairSetTables.Select(pairSet => this.GetEnumerableFromInternalList(
() => (ushort)pairSet.PairValueCount(fontTable.Wrapped),
i => new PositioningPair
{
SecondGlyphID = (ushort)pairSet.PairValueGlyph(fontTable.Wrapped, i),
FirstGlyphPositionChange = this.ParseValueRecord(fontTable, new AccessPrivateWrapper(pairSet.FirstValueRecord(fontTable.Wrapped, i, table.FirstValueFormat(fontTable.Wrapped)))),
SecondGlyphPositionChange = this.ParseValueRecord(fontTable, new AccessPrivateWrapper(pairSet.SecondValueRecord(fontTable.Wrapped, i, table.SecondValueFormat(fontTable.Wrapped)))),
}).ToList()).ToList(),
LookupFlags = lookupFlags
});
case 2:
var class2Count = (ushort)table.Format2Class2Count(fontTable.Wrapped);
return(new ClassPairPositioningTable
{
Coverage = coverage,
FirstClassDef = this.ParseClassDef(fontTable, new AccessPrivateWrapper(table.Format2Class1Table(fontTable.Wrapped))),
SecondClassDef = this.ParseClassDef(fontTable, new AccessPrivateWrapper(table.Format2Class2Table(fontTable.Wrapped))),
PairSets =
(from i in Enumerable.Range(0, (ushort)table.Format2Class1Count(fontTable.Wrapped))
select
(from j in Enumerable.Range(0, class2Count)
select Tuple.Create(
(GlyphPositionChange)this.ParseValueRecord(fontTable, new AccessPrivateWrapper(table.Format2FirstValueRecord(fontTable.Wrapped, class2Count, (ushort)i, (ushort)j))),
(GlyphPositionChange)this.ParseValueRecord(fontTable, new AccessPrivateWrapper(table.Format2SecondValueRecord(fontTable.Wrapped, class2Count, (ushort)i, (ushort)j)))
)).ToList()).ToList(),
LookupFlags = lookupFlags
});
default:
throw new UnknownTableFormatException(type, format);
}
}
