Decodes a unicode and returns glyph id. Glyph id is a unique number for a glyph which is font type dependent. For example Type1s id is a glyph name instance of GlyphStringIdaspose.font.glyphs/glyphstringid class. Ttfs id is an int index instance of GlyphUInt32Idaspose.font.glyphs/glyphuint32id class.... TTF’s id is an int index, instance...