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 ) { switch (Format(Table)) { case 1: GlyphContextSubtable glyphContextSubtable = new GlyphContextSubtable(offset); return glyphContextSubtable.Apply( Font, TableTag, Table, Metrics, CharCount, Charmap, GlyphInfo, Advances, Offsets, LookupFlags, FirstGlyph, AfterLastGlyph, Parameter, nestingLevel, out NextGlyph ); case 2: ClassContextSubtable classContextSubtable = new ClassContextSubtable(offset); return classContextSubtable.Apply( Font, TableTag, Table, Metrics, CharCount, Charmap, GlyphInfo, Advances, Offsets, LookupFlags, FirstGlyph, AfterLastGlyph, Parameter, nestingLevel, out NextGlyph ); case 3: CoverageContextSubtable coverageContextSubtable = new CoverageContextSubtable(offset); return coverageContextSubtable.Apply( Font, TableTag, Table, Metrics, CharCount, Charmap, GlyphInfo, Advances, Offsets, LookupFlags, FirstGlyph, AfterLastGlyph, Parameter, nestingLevel, out NextGlyph ); default: //Unknown format NextGlyph = FirstGlyph+1; //don't match return false; } }