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Updated International Text (markdown)

springmeyer 2012-03-15 18:12:14 -07:00
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InternationalText.md

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<!-- Name: InternationalText -->
<!-- Version: 14 -->
<!-- Last-Modified: 2011/09/06 11:31:00 -->
<!-- Author: springmeyer -->
# International Text
Mapnik supports unicode text and Right-to-left (RTL) languages (through ICU library).
Mapnik supports unicode text through ICU and has only very rudimentary support for Right-to-left (RTL) languages.
This page is to document and discuss improvements needed to unicode text handling.
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* [#558](https://github.com/mapnik/mapnik/issues/558) - Character spacing not correct for nepali text
* [#582](https://github.com/mapnik/mapnik/issues/582) - TextSymbolizer bug with Armenian letters
## Issues
## Resources
* Better leveraging of ICU
* Does ICU support any mirroring that we are not yet leveraging?
* It seems that ICU *does not* support shaping for anything other than Arabic RTL, but need to dig deeper
* Other libraries that solve some of these problems:
* In the past developer discussions have mentioned using the [pango library](http://www.pango.org/), or ideas from [liblinebreak](http://vimgadgets.sourceforge.net/liblinebreak/)
* If used Pango would need to be an optional dependecy because we don't want to have to depend on whole GLib/GTK stack.
* Artem is not interested in a pango dependency
* (MapOSMatic is using pango via python: http://news.maposmatic.org/?p=125)
* What about http://www.freedesktop.org/wiki/Software/HarfBuzz?
* http://behdad.org/text/
* http://shapecatcher.com/
* "State of Text Rendering": http://behdad.org/text/
* [HarfBuzz](http://www.freedesktop.org/wiki/Software/HarfBuzz)
* [pango library](http://www.pango.org/)
* [liblinebreak](http://vimgadgets.sourceforge.net/liblinebreak/)
* If used Pango would need to be an optional dependency because we don't want to have to depend on whole GLib/GTK stack.
* http://shapecatcher.com/
* Mozilla bug that has good testcases that could be harvested: https://bugzilla.mozilla.org/show_bug.cgi?id=721821