glyph.item in the specified cairo context,
embedding the text associated with the glyphs in the output if the
output format supports it (PDF for example), otherwise it acts
similar to pangoCairoShowGlyphString.pangoCairoShowGlyphItem(cr, text, glyph.item)crCairo] a Cairo contexttextglyph.item refers toglyph.itemtext is the start of the text for layout, which is then
indexed by glyph_item->item->offset.
Since 1.22