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);
}
public void CompileTransformation_ReverseChainingContextSubsitutionTable_CallsBuilderCorrectly()
{
/* Replaces 104 in (101|201) (102|202) (103|203) (104|204) (105|205) (106|206) (107|208) for 304 and 204 in the same context for 404.
*/
var table = new ReverseChainingContextSubstitutionTable
{
Coverage = new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 104, 204 })
},
LookbackCoverages = new []
{
new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 103, 203 })
},
new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 102, 202 })
},
new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 101, 201 })
}
},
LookaheadCoverages = new[]
{
new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 105, 205 })
},
new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 106, 206 })
},
new ListCoverageTable {
CoveredGlyphIdList = new HashSet <ushort>(new ushort[] { 107, 207 })
}
},
SubstituteGlyphIds = new ushort[] { 304, 404 },
LookupFlags = LookupFlags.IgnoreLigatures
};
var expected = new IEnumerable <ITransition>[]
{
new[]
{
(ITransition) new SetTransition {
GlyphIdSet = new HashSet <ushort> {
107, 207
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
106, 206
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
105, 205
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
104, 204
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
103, 203
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
102, 202
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
101, 201
}, HeadShift = 3, LookupFlags = LookupFlags.IgnoreLigatures
},
new SimpleTransition {
GlyphId = 104, HeadShift = 3, LookupFlags = LookupFlags.IgnoreLigatures, Action = new SubstitutionAction {
ReplacedGlyphCount = 1, ReplacementGlyphIds = new ushort[] { 304 }
}
}
},
new[]
{
(ITransition) new SetTransition {
GlyphIdSet = new HashSet <ushort> {
107, 207
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
106, 206
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
105, 205
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
104, 204
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
103, 203
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
102, 202
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
101, 201
}, HeadShift = 3, LookupFlags = LookupFlags.IgnoreLigatures
},
new SimpleTransition {
GlyphId = 204, HeadShift = 3, LookupFlags = LookupFlags.IgnoreLigatures, Action = new SubstitutionAction {
ReplacedGlyphCount = 1, ReplacementGlyphIds = new ushort[] { 404 }
}
}
},
new[]
{
(ITransition) new SetTransition {
GlyphIdSet = new HashSet <ushort> {
107, 207
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
106, 206
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
105, 205
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
104, 204
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
103, 203
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
102, 202
}, HeadShift = -1, LookupFlags = LookupFlags.IgnoreLigatures
},
new SetTransition {
GlyphIdSet = new HashSet <ushort> {
101, 201
}, HeadShift = 3, LookupFlags = LookupFlags.IgnoreLigatures
},
new AlwaysTransition {
HeadShift = 3, LookupFlags = LookupFlags.IgnoreLigatures
}
}
};
this.TestCompileTransformation(table, expected, ProcessingDirection.EndToStart);
}
