[HarfBuzz] Overlap of vocal with thai text

[Konstantin Ritt]

2015-02-24 13:58 GMT+04:00 Vignesh Raman <rvignesh.raman at gmail.com>:

> Hi,
>
> In one of the test using qt harfbuzz the font "ซ้ำ" is rendered as
> http://postimg.org/image/77eo3ekbb/bfc768ce/
>
> There was a similar issue reported in
> https://bugreports.qt.io/browse/QTBUG-21206.
>
> I applied the harfbuzz thai patches from,
>
> http://linux.thai.net/websvn/wsvn/software.qt/trunk/qt-everywhere-opensource-4.7.0/?#ad73b806583aa98bb601f6b456fa92491
>
> Also I applied the patch,
> Fix isolated Thai SARA AM handling -
> 44f415aafaf7eec56b31468a58e0ca768bbc082d
>
> But the issue was still not resolved.
>
> I checked in harfbuzz-0.9.38,
> ./hb-view --annotate Tahoma.ttf "ซ้ำ" > thai1.png
>
> The text rendered properly (There is no overlap of vocal as shown in
> previous image)
> http://postimg.org/image/h62uhsu29/dab679e6/
>
>
You need Qt 5.5 (where HB-NG is the preferred shaper engine) or Qt 5.4
configured with -qt-harfbuzz.
Plz re-open QTBUG-21206 <https://bugreports.qt.io/browse/QTBUG-21206> if
the issue still reproducible with 5.5.


>
> My questions
> 1) From above two test can we confirm that harfbuzz-0.9.38 renders the
> thai text correctly and qt harfbuzz is not rendering correctly?
>

yes


> 2) Is there a way to test thai characters/text with
> qt-everywhere-opensource-src-4.7.4/src/3rdparty/harfbuzz ?
>

no. use Qt>=5.4


> 3) Is this a know issue with qt harfbuzz ?
>

didn't you just point to QTBUG-21206
<https://bugreports.qt.io/browse/QTBUG-21206>? so I'd say it is a known
issue for old Qt.


Regards,
Konstantin
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