The cpdf_set_text_rendering()
function determines how text is rendered.
The possible values for
mode are 0=fill text, 1=stroke text, 2=fill and
stroke text, 3=invisible, 4=fill text and add it to clipping
path, 5=stroke text and add it to clipping path, 6=fill and
stroke text and add it to clipping path, 7=add it to clipping
path.