ccontext:ShowGlyphItem(text$, glyph_item)
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 ccontext:ShowGlyphString().
The origin of the glyphs (the left edge of the baseline) will be drawn at the current point of the Cairo context.
Note that text is the start of the text for layout, which is then
indexed by the offset member of the glyph item.
glyph_item refers to