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
});
}
private ContextTransformationRule ParseContextTransformationRule(dynamic fontTable, dynamic rule, Func <dynamic, int, ushort> idProjection)
{
dynamic contextualLookupsTable = new AccessPrivateWrapper(rule.ContextualLookups(fontTable.Wrapped));
return(new ContextTransformationRule
{
Context = this.GetEnumerableFromInternalList(
() => rule.GlyphCount(fontTable.Wrapped),
i => (ushort)idProjection(rule, i)).ToList(),
TransformationSets = this.GetEnumerableFromInternalList(
() => rule.SubstCount(fontTable.Wrapped),
i => new ContextTransformationSet
{
FirstGlyphIndex = contextualLookupsTable.SequenceIndex(fontTable.Wrapped, i),
Transformations = this.GetTransformationTablesByLookupIndex(fontTable, contextualLookupsTable.LookupIndex(fontTable.Wrapped, i))
}).ToList()
});
}
private ChainingContextTransformationRule ParseChainingTransformationRule(dynamic fontTable, dynamic rule, Func <dynamic, int, ushort> idProjection, ushort firstInputId)
{
const int GlyphIdSize = 2;
// Load the lookback
var lookBackCount = rule.GlyphCount(fontTable.Wrapped, rule.offset);
int currentOffset = rule.offset + rule.sizeCount;
var lookBackGlyphIds = this.GetEnumerableFromInternalList(
() => lookBackCount,
i => (ushort)idProjection(rule, (i * GlyphIdSize) + currentOffset)).ToList();
currentOffset += lookBackCount * GlyphIdSize;
// Load the context
var contextCount = rule.GlyphCount(fontTable.Wrapped, currentOffset);
currentOffset += rule.sizeCount;
// The first element of the context comes from index of the rule set
var contextGlyphIds = this.GetEnumerableFromInternalList(
() => (ushort)(contextCount - 1),
i => (ushort)idProjection(rule, (i * GlyphIdSize) + currentOffset)).Prepend(firstInputId).ToList();
currentOffset += (contextCount - 1) * GlyphIdSize;
// Load the context
var lookAheadCount = rule.GlyphCount(fontTable.Wrapped, currentOffset);
currentOffset += rule.sizeCount;
var lookAheadGlyphIds = this.GetEnumerableFromInternalList(
() => lookAheadCount,
i => (ushort)idProjection(rule, (i * GlyphIdSize) + currentOffset)).ToList();
currentOffset += lookAheadCount * GlyphIdSize;
// Load the substitution lookup records
var lookupSubstitutionRecordCount = fontTable.GetUShort(currentOffset);
dynamic contextualLookupsTable = new AccessPrivateWrapper(rule.ContextualLookups(fontTable.Wrapped, currentOffset));
return(new ChainingContextTransformationRule
{
Lookback = lookBackGlyphIds,
Context = contextGlyphIds,
Lookahead = lookAheadGlyphIds,
TransformationSets = this.GetEnumerableFromInternalList(
() => lookupSubstitutionRecordCount,
i => new ContextTransformationSet
{
FirstGlyphIndex = contextualLookupsTable.SequenceIndex(fontTable.Wrapped, i),
Transformations = this.GetTransformationTablesByLookupIndex(fontTable, contextualLookupsTable.LookupIndex(fontTable.Wrapped, i))
}).ToList()
});
}
/// <summary>
/// Dumps information about the specified typeface into console output stream.
/// </summary>
/// <param name="typeface">The typeface.</param>
public void Dump(GlyphTypeface typeface)
{
dynamic fontTable = this.GetFontTable(typeface);
dynamic fontTableHeader = this.GetFontTableHeader();
dynamic featureList = new AccessPrivateWrapper(fontTableHeader.GetFeatureList(fontTable.Wrapped));
dynamic lookupList = new AccessPrivateWrapper(fontTableHeader.GetLookupList(fontTable.Wrapped));
for (ushort i = 0; i < featureList.FeatureCount(fontTable.Wrapped); i++)
{
Console.WriteLine(i + " " + TagConverter.TagFromUint((uint)featureList.FeatureTag(fontTable.Wrapped, i)).Label);
dynamic featureTable = new AccessPrivateWrapper(featureList.FeatureTable(fontTable.Wrapped, i));
for (ushort j = 0; j < featureTable.LookupCount(fontTable.Wrapped); j++)
{
dynamic lookupTable = new AccessPrivateWrapper(lookupList.Lookup(fontTable.Wrapped, featureTable.LookupIndex(fontTable.Wrapped, j)));
var lookupFlags = (LookupFlags)lookupTable.LookupFlags();
var substitutionLookupType = (PositioningLookupType)lookupTable.LookupType();
Console.Write(
"\t" + j + " " + lookupTable.offset + " " + featureTable.LookupIndex(fontTable.Wrapped, j) + " " +
substitutionLookupType.ToString() + " ");
if (substitutionLookupType == PositioningLookupType.ExtensionPositioning)
{
var type = typeof(GlyphTypeface).Assembly.GetType("MS.Internal.Shaping.ExtensionLookupTable");
var subTables = this.GetEnumerableFromInternalList(
() => lookupTable.SubTableCount(),
index => (dynamic) new AccessPrivateWrapper(type.Instantiate((ushort)lookupTable.SubtableOffset(fontTable.Wrapped, index))));
Console.Write(" [" + string.Join(", ", subTables.Select(subTable => ((PositioningLookupType)subTable.LookupType(fontTable.Wrapped)).ToString()).Distinct()) + "] ");
}
Console.Write("(");
var flagsStrings = new List <string>();
if ((lookupFlags & LookupFlags.RightToLeft) == LookupFlags.RightToLeft)
{
flagsStrings.Add("RTL");
}
if ((lookupFlags & LookupFlags.IgnoreBaseGlyphs) == LookupFlags.IgnoreBaseGlyphs)
{
flagsStrings.Add("IgnoreBaseGlyphs");
}
if ((lookupFlags & LookupFlags.IgnoreLigatures) == LookupFlags.IgnoreLigatures)
{
flagsStrings.Add("IgnoreLigatures");
}
if ((lookupFlags & LookupFlags.IgnoreMarks) == LookupFlags.IgnoreMarks)
{
flagsStrings.Add("IgnoreMarks");
}
if ((lookupFlags & LookupFlags.UseMarkFilteringSet) == LookupFlags.UseMarkFilteringSet)
{
flagsStrings.Add("UseMarkFilteringSet");
}
if ((lookupFlags & LookupFlags.MarkAttachmentTypeMask) > 0)
{
flagsStrings.Add("MarkAttachmentTypeMask=" + (lookupFlags & LookupFlags.MarkAttachmentTypeMask));
}
Console.WriteLine(string.Join(", ", flagsStrings) + ") x" + lookupTable.SubTableCount());
}
}
}
