public bool IsLookupCovered(
FontTable table,
uint[] glyphBits,
ushort minGlyphId,
ushort maxGlyphId)
{
switch (Format(table))
{
case 1:
GlyphChainingSubtable glyphChainingSubtable =
new GlyphChainingSubtable(offset);
return glyphChainingSubtable.IsLookupCovered(table, glyphBits, minGlyphId, maxGlyphId);
case 2:
ClassChainingSubtable classChainingSubtable =
new ClassChainingSubtable(offset);
return classChainingSubtable.IsLookupCovered(table, glyphBits, minGlyphId, maxGlyphId);
case 3:
CoverageChainingSubtable coverageChainingSubtable =
new CoverageChainingSubtable(table, offset);
return coverageChainingSubtable.IsLookupCovered(table, glyphBits, minGlyphId, maxGlyphId);
default:
return true;
}
}
public CoverageTable GetPrimaryCoverage(FontTable table)
{
switch (Format(table))
{
case 1:
GlyphChainingSubtable glyphChainingSubtable =
new GlyphChainingSubtable(offset);
return glyphChainingSubtable.GetPrimaryCoverage(table);
case 2:
ClassChainingSubtable classChainingSubtable =
new ClassChainingSubtable(offset);
return classChainingSubtable.GetPrimaryCoverage(table);
case 3:
CoverageChainingSubtable coverageChainingSubtable =
new CoverageChainingSubtable(table, offset);
return coverageChainingSubtable.GetPrimaryCoverage(table);
default:
return CoverageTable.InvalidCoverage;
}
}
public unsafe bool Apply(
IOpenTypeFont Font, // Font access interface
OpenTypeTags TableTag, // Layout table tag (GSUB or GPOS)
FontTable Table, // Layout table (GSUB or GPOS)
LayoutMetrics Metrics, // LayoutMetrics
int CharCount, // Characters count (i.e. Charmap.Length);
UshortList Charmap, // Char to glyph mapping
GlyphInfoList GlyphInfo, // List of GlyphInfo structs
int* Advances, // Glyph adv.widths
LayoutOffset* Offsets, // Glyph offsets
ushort LookupFlags, // Lookup table flags
int FirstGlyph, // where to apply it
int AfterLastGlyph, // how long is a context we can use
uint Parameter, // lookup parameter
int nestingLevel, // Contextual lookup nesting level
out int NextGlyph // out: next glyph index
)
{
NextGlyph = FirstGlyph+1; //In case we don't match
switch (Format(Table))
{
case 1:
GlyphChainingSubtable glyphChainingSubtable =
new GlyphChainingSubtable(offset);
return glyphChainingSubtable.Apply(
Font, TableTag, Table, Metrics,
CharCount, Charmap,
GlyphInfo, Advances, Offsets,
LookupFlags, FirstGlyph, AfterLastGlyph,
Parameter,
nestingLevel,
out NextGlyph
);
case 2:
ClassChainingSubtable classChainingSubtable =
new ClassChainingSubtable(offset);
return classChainingSubtable.Apply(
Font, TableTag, Table, Metrics,
CharCount, Charmap,
GlyphInfo, Advances, Offsets,
LookupFlags, FirstGlyph, AfterLastGlyph,
Parameter,
nestingLevel,
out NextGlyph
);
case 3:
CoverageChainingSubtable coverageChainingSubtable =
new CoverageChainingSubtable(Table, offset);
return coverageChainingSubtable.Apply(
Font, TableTag, Table, Metrics,
CharCount, Charmap,
GlyphInfo, Advances, Offsets,
LookupFlags, FirstGlyph, AfterLastGlyph,
Parameter,
nestingLevel,
out NextGlyph
);
default:
//Unknown format
return false;
}
}