PangoDirection:
@PANGO_DIRECTION_LTR: A strong left-to-right direction
@PANGO_DIRECTION_RTL: A strong right-to-left direction
@PANGO_DIRECTION_TTB_LTR: Deprecated value; treated the
same as %PANGO_DIRECTION_RTL.
@PANGO_DIRECTION_TTB_RTL: Deprecated value; treated the
same as %PANGO_DIRECTION_LTR
@PANGO_DIRECTION_WEAK_LTR: A weak left-to-right direction
@PANGO_DIRECTION_WEAK_RTL: A weak right-to-left direction
@PANGO_DIRECTION_NEUTRAL: 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.
PangoDirection: @PANGO_DIRECTION_LTR: A strong left-to-right direction @PANGO_DIRECTION_RTL: A strong right-to-left direction @PANGO_DIRECTION_TTB_LTR: Deprecated value; treated the same as %PANGO_DIRECTION_RTL. @PANGO_DIRECTION_TTB_RTL: Deprecated value; treated the same as %PANGO_DIRECTION_LTR @PANGO_DIRECTION_WEAK_LTR: A weak left-to-right direction @PANGO_DIRECTION_WEAK_RTL: A weak right-to-left direction @PANGO_DIRECTION_NEUTRAL: 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.