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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. order.
</para> </para>
<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 HarfBuzz will preserve the monotonic property: client programs
are guaranteed that monotonically increasing initial cluster are guaranteed that monotonically increasing initial cluster
values will be returned as monotonically increasing final values will be returned as monotonically increasing final
cluster values. cluster values.
</para> </para>
<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 the directionality of the buffer itself is reversed for final
output as a matter of design. Therefore, HarfBuzz inverts the output as a matter of design. Therefore, HarfBuzz inverts the
monotonic property: client programs are guaranteed that monotonic property: client programs are guaranteed that