bufferSetDirection
Set the text flow direction of the buffer. No shaping can happen without setting @buffer direction, and it controls the visual direction for the output glyphs; for RTL direction the glyphs will be reversed. Many layout features depend on the proper setting of the direction, for example, reversing RTL text before shaping, then shaping with LTR direction is not the same as keeping the text in logical order and shaping with RTL direction.
Since
0.9.2
Parameters
buffer
An #hb_buffer_t
direction
the #hb_direction_t of the @buffer