order.
</para>
<para>
- For left-to-right scripts (LTR) and top-to-bottom scripts (TTB),
+ For buffers in the left-to-right (LTR)
+ or top-to-bottom (TTB) text flow direction,
HarfBuzz will preserve the monotonic property: client programs
are guaranteed that monotonically increasing initial cluster
values will be returned as monotonically increasing final
cluster values.
</para>
<para>
- For right-to-left scripts (RTL) and bottom-to-top scripts (BTT),
+ For buffers in the right-to-left (RTL)
+ or bottom-to-top (BTT) text flow direction,
the directionality of the buffer itself is reversed for final
output as a matter of design. Therefore, HarfBuzz inverts the
monotonic property: client programs are guaranteed that