Pango

Original author(s)Owen Taylor
Raph Levien
Developer(s)Behdad Esfahbod
Initial release11 July 1999; 24 years ago (1999-07-11)
Stable release
1.50.14 Edit this on Wikidata / 2 March 2023; 4 months ago (2 March 2023)
Repository
Written inC
Operating systemUnix-like, Microsoft Windows, Other
TypeSoftware development library
LicenseLGPL
Websitewww.pango.org

Pango (stylized as Παν語) is a text (i.e. glyph) layout engine library which works with the HarfBuzz shaping engine for displaying multi-language text.

Full-function rendering of text and cross-platform support is achieved when Pango is used with platform APIs or third-party libraries, such as Uniscribe and FreeType, as text rendering backends. Pango-processed text will appear similar under different operating systems.[clarification needed]

Pango is a special-purpose library for text and not a general-purpose graphics rendering library such as Cairo, with which Pango can be used. The Cairo documentation recommends Pango be used to "render" text rather than Cairo for all but the simplest text "rendering".

History and naming

The name pango comes from Greek pan (παν, "all") and Japanese go (, "language").

In January 2000, the merger of the GScript and GnomeText projects was named Pango.

Pango version 1.0.0 was released 11 March 2002.

Support for OpenType features

Default rendering above, localized Romanian rendering below.

Pango 1.17 and newer support the 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:

forlanginenro;dopango-view\
--font="Verdana 64"\
--text"şţ vs. șț in $lang"\
--language=$lang;done

For an explanation of the substitutions rules for Romanian, see this 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 Pango markup, e.g.:

pango-view\
--font="Verdana 24"\
--markup\
--text'In the same text: şţ(en) and <span lang="ro">şţ(ro).</span>'

Since 1.37.1, Pango added more attributes to provide complete support for processing OpenType feature.

The official showcase of Pango's script-aware features is here.

Major users

Simplified software architecture of GTK. Pango, GDK, ATK, GIO, Cairo and GLib.

Pango has been integrated into most Linux distributions. The GTK UI toolkit uses Pango for all of its text rendering. The Linux versions of the Mozilla Firefox web browser and Mozilla Thunderbird mail client use Pango for text rendering.

See also


This page was last updated at 2023-07-18 14:26 UTC. Update now. View original page.

All our content comes from Wikipedia and under the Creative Commons Attribution-ShareAlike License.


Top

If mathematical, chemical, physical and other formulas are not displayed correctly on this page, please useFirefox or Safari