| Value | Meaning |
|---|---|
| LTR0 | A strong left-to-right direction |
| RTL1 | A strong right-to-left direction |
| TTB_LTR2 | Deprecated value; treated the same as %PANGO_DIRECTION_RTL. |
| TTB_RTL3 | Deprecated value; treated the same as %PANGO_DIRECTION_LTR |
| WEAK_LTR4 | A weak left-to-right direction |
| WEAK_RTL5 | A weak right-to-left direction |
| NEUTRAL6 | No direction specified |
The #PangoDirection type represents a direction in the Unicode bidirectional algorithm; not every value in this enumeration makes sense for every usage of #PangoDirection; for example, the return value of pango_unichar_direction() and pango_find_base_dir() cannot be %PANGO_DIRECTION_WEAK_LTR or %PANGO_DIRECTION_WEAK_RTL, since every character is either neutral or has a strong direction; on the other hand %PANGO_DIRECTION_NEUTRAL doesn't make sense to pass to pango_itemize_with_base_dir().
The %PANGO_DIRECTION_TTB_LTR, %PANGO_DIRECTION_TTB_RTL values come from an earlier interpretation of this enumeration as the writing direction of a block of text and are no longer used; See #PangoGravity for how vertical text is handled in Pango.
If you are interested in text direction, you should really use fribidi directly. PangoDirection is only retained because it is used in some public apis.