Editing Pango (section)

==Support for OpenType features==
[[Image:Pango locl demo.png|thumb|250px|Default rendering above, localized Romanian rendering below.]]

Pango 1.17 and newer support the '{{not a typo|locl}}' feature tag that allows localized glyphs to be used for the same Unicode code point. Assuming you have [[Verdana]] version 5.01 installed, which supports the 'locl' feature for the latn/ROM (Romanian) script, a quick demonstration (on Linux) is:
<syntaxhighlight lang="bash">
for lang in en ro
do
    pango-view \
        --font="Verdana 64" \
        --text "şţ vs. șț in $lang" \
        --language=$lang
done
</syntaxhighlight>

For an explanation of the substitutions rules for Romanian, see this [[Romanian alphabet#Comma-below .28.C8.99 and .C8.9B.29 versus cedilla .28.C5.9F and .C5.A3.29|discussion]].

Setting the locale via the POSIX environment variable, e.g. LANG=ro_RO.UTF-8 will also cause Pango to use 'locl' font feature. Finally, you can change the language on the fly in the same text using [https://docs.gtk.org/Pango/pango_markup.html Pango markup], e.g.:
<syntaxhighlight lang="bash">
pango-view \
    --font="Verdana 24" \
    --markup \
    --text 'In the same text: şţ(en) and <span lang="ro">şţ(ro).</span>'
</syntaxhighlight>

Since 1.37.1, Pango added more attributes to provide complete support for processing OpenType feature.<ref>{{cite web
 | url        = https://ftp.gnome.org/pub/GNOME/sources/pango/1.37/pango-1.37.1.news
 | title      = Overview of changes between 1.37.0 and 1.37.1
 | access-date = 18 August 2015}}</ref><ref>{{cite web
 | url        = https://bugzilla.gnome.org/show_bug.cgi?id=738505
 | title      = Bug 738505 - Add fontfeatures support in PangoAttributes and markup
 | publisher  = GNOME Bugzilla
 | access-date = 18 August 2015}}</ref><ref>{{cite web
 | url        = http://tavmjong.free.fr/blog/?p=1442
 | title      = Font Features Land in Inkscape Trunk
 | publisher  = Tavmjong Bah's Blog
 | date       = 23 June 2015
 | access-date = 18 August 2015}}</ref>

The official showcase of Pango's script-aware features is [https://www.pango.org/ScriptGallery here].