void pango_layout_set_auto_dir ( PangoLayout* layout, gboolean auto_dir )
Sets whether to calculate the base direction for the layout according to its contents.
When this flag is on (the default), then paragraphs in
begin with strong right-to-left characters (Arabic and Hebrew principally),
will have right-to-left layout, paragraphs with letters from other scripts
will have left-to-right layout. Paragraphs with only neutral characters
get their direction from the surrounding paragraphs.
FALSE, the choice between left-to-right and right-to-left
layout is done according to the base direction of the layout’s
When the auto-computed direction of a paragraph differs from the
base direction of the context, the interpretation of
PANGO_ALIGN_RIGHT are swapped.