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Clusters are reversed based on the direction, not script 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1818
This commit is contained in:
Simon Sapin 2019-07-05 19:05:11 +02:00 committed by Behdad Esfahbod
parent cf1a782a5c
commit 144326e215
1 changed files with 4 additions and 2 deletions
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6
docs/usermanual-clusters.xml
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@ -156,14 +156,16 @@
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