private IGlyphTransformationTable ParseReverseChainingSubstitutionTable(int subTableOffset, dynamic fontTable, LookupFlags lookupFlags)
{
var type = typeof(GlyphTypeface).Assembly.GetType("MS.Internal.Shaping.ReverseChainingSubtable");
dynamic table = new AccessPrivateWrapper(type.Instantiate(subTableOffset));
ushort format = table.Format(fontTable.Wrapped);
if (format != 1)
{
throw new UnknownTableFormatException(type, format);
}
var result = new ReverseChainingContextSubstitutionTable
{
Coverage = this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.InputCoverage(fontTable.Wrapped)))
};
int currentOffset = table.offset + table.offsetBacktrackGlyphCount;
ushort lookbackCount = table.GlyphCount(fontTable.Wrapped, currentOffset);
currentOffset += 2;
result.LookbackCoverages = this.GetEnumerableFromInternalList(
() => lookbackCount,
i => (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.Coverage(fontTable.Wrapped, currentOffset)))
).ToList();
currentOffset += 2 * lookbackCount;
ushort lookaheadCount = table.GlyphCount(fontTable.Wrapped, currentOffset);
currentOffset += 2;
result.LookaheadCoverages = this.GetEnumerableFromInternalList(
() => lookaheadCount,
i => (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.Coverage(fontTable.Wrapped, currentOffset)))
).ToList();
currentOffset += 2 * lookaheadCount;
ushort glyphCount = table.GlyphCount(fontTable.Wrapped, currentOffset);
currentOffset += 2;
result.SubstituteGlyphIds = this.GetEnumerableFromInternalList(
() => glyphCount,
i => (ushort)table.Glyph(fontTable.Wrapped, currentOffset)
).ToList();
result.LookupFlags = lookupFlags;
return(result);
}
private IGlyphTransformationTable ParseCoverageChainingSubstitutionTable(int subTableOffset, dynamic fontTable, LookupFlags lookupFlags)
{
var type = typeof(GlyphTypeface).Assembly.GetType("MS.Internal.Shaping.CoverageChainingSubtable");
dynamic table = new AccessPrivateWrapper(TypeExtensions.Instantiate(type, fontTable.Wrapped, subTableOffset));
dynamic contextualLookupTable = new AccessPrivateWrapper(table.ContextualLookups(fontTable.Wrapped));
return(new ChainingCoverageContextSubstitutionTable
{
LookbackCoverages = this.GetEnumerableFromInternalList(
() => table.BacktrackGlyphCount(fontTable.Wrapped),
i => (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.BacktrackCoverage(fontTable.Wrapped, i)))).ToList(),
ContextCoverages = this.GetEnumerableFromInternalList(
() => table.InputGlyphCount(fontTable.Wrapped),
i => (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.InputCoverage(fontTable.Wrapped, i)))).ToList(),
LookaheadCoverages = this.GetEnumerableFromInternalList(
() => table.LookaheadGlyphCount(fontTable.Wrapped),
i => (ICoverageTable)this.ParseCoverageTable(fontTable, new AccessPrivateWrapper(table.LookaheadCoverage(fontTable.Wrapped, i)))).ToList(),
TransformationSets = this.GetEnumerableFromInternalList(
() => contextualLookupTable.recordCount,
i => new ContextTransformationSet
{
FirstGlyphIndex = contextualLookupTable.SequenceIndex(fontTable.Wrapped, i),
Transformations = this.GetTransformationTablesByLookupIndex(fontTable, contextualLookupTable.LookupIndex(fontTable.Wrapped, i))
}).ToList(),
LookupFlags = lookupFlags
});
}
