Re: Unicode normalization and text display differences

[Behdad Esfahbod <behdad esfahbod gmail com>]

Hi Ben,

You at least need to tell us on what platform you are testing this and with
what fonts.

On 16-01-06 02:00 PM, Benjamin Kiessling wrote:
> Hi everybody,
>
> I am trying to build a simple line generation tool for training neural
> networks for OCR and everything is working fine except an oddity in
> display depending on Unicode normalization, in particular diacritic
> placement.
>
> In [0] (text is normalized to NFC) diacritics are placed correctly while
> in [1] (text normalized to NFD) diacritics are placed next to the
> preceding code point. 
>
> If I understand Unicode correctly there should be no difference in
> display and there is a presentation about Pango from 2004 claiming that
> there shouldn't be one.
>
> Is this a known issue or expected behavior? Is there some preprocessing
> necessary before using pango_layout_set_text()?
>
> All Best,
> Ben
>
> [0] http://l.unchti.me/dump/nfc.png
> [1] http://l.unchti.me/dump/nfd.png
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