Harfbuzz

HOW TO UPDATE
* Check out external/harfbuzz to <checkout_dir>
  ex: git clone https://android.googlesource.com/platform/external/harfbuzz_ng
* Locate the commit you'd like to move.
  ex: for 1.7.4: https://github.com/harfbuzz/harfbuzz/commit/007a2a4317227b8fb4c764c590203c85fc3da5fd
* In <checkout_dir>, run git merge <commit_sha>
  i.e. git merge 007a2a4317227b8fb4c764c590203c85fc3da5fd
* Upload the changes.
  ex: git push origin HEAD:refs/for/master
* Gerrit will run the text related tests.

NOTE:
 Since Chromium updates Harfbuzz more frequently, you can check the following URL for their changes
 and latest merges.
 https://chromium.googlesource.com/chromium/src/+log/master/third_party/harfbuzz-ng

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# HarfBuzz

HarfBuzz is a text shaping engine. It primarily supports [OpenType][1], but also
[Apple Advanced Typography][2]. HarfBuzz is used in Android, Chrome,
ChromeOS, Firefox, GNOME, GTK+, KDE, Qt, LibreOffice, OpenJDK, XeTeX,
PlayStation, Microsoft Edge, Adobe Photoshop, Illustrator, InDesign,
Godot Engine, Unreal Engine, and other places.

[![xkcd-derived image](xkcd.png)](https://xkcd.com/2347/)

For bug reports, mailing list, and other information please visit:

  http://harfbuzz.org/

For license information, see [COPYING](COPYING).

## Documentation

For user manual as well as API documentation, check: https://harfbuzz.github.io

## Download

For tarball releases of HarfBuzz, look [here][3]. At the same place you
will also find Win32/Win64 binary bundles that include `libharfbuzz` DLL,
`hb-view.exe`, `hb-shape.exe`, and all dependencies.

The canonical source tree is available on [github][4].

The API that comes with `hb.h` will not change incompatibly. Other, peripheral,
headers are more likely to go through minor modifications, but again, we do our
best to never change API in an incompatible way. We will never break the ABI.

If you are not sure whether Pango or HarfBuzz is right for you, read [Pango vs
HarfBuzz][5].

## Development

For build information, see [BUILD.md](BUILD.md).

For custom configurations, see [CONFIG.md](CONFIG.md).

For testing and profiling, see [TESTING.md](TESTING.md).

To get a better idea of where HarfBuzz stands in the text rendering stack you
may want to read [State of Text Rendering 2024][6].
Here are a few presentation slides about HarfBuzz at the
Internationalization and Unicode Conference over the years:

*   November 2014, [Unicode, OpenType, and HarfBuzz: Closing the Circle][7],
*   October 2012, [HarfBuzz, The Free and Open Text Shaping Engine][8],
*   October 2009, [HarfBuzz: the Free and Open Shaping Engine][9].

Both development and user support discussion around HarfBuzz happens on the
[github][4].

To report bugs or submit patches please use [github][4] issues and
pull-requests.

For a comparison of old vs new HarfBuzz memory consumption see [this][10].

<!--See past and upcoming [HarfBuzz Hackfests](https://freedesktop.org/wiki/Software/HarfBuzz/Hackfests/)!-->

## Name

HarfBuzz (حرف‌باز) is the literal Persian translation of “[OpenType][1]”,
transliterated using the Latin script. It also means "talkative" or
"glib" (also a nod to the GNOME project where HarfBuzz originates from).

> Background: Originally there was this font format called TrueType. People and
> companies started calling their type engines all things ending in Type:
> FreeType, CoolType, ClearType, etc. And then came OpenType, which is the
> successor of TrueType. So, for my OpenType implementation, I decided to stick
> with the concept but use the Persian translation. Which is fitting given that
> Persian is written in the Arabic script, and OpenType is an extension of
> TrueType that adds support for complex script rendering, and HarfBuzz is an
> implementation of OpenType complex text shaping.

<details>
  <summary>Packaging status of HarfBuzz</summary>

[![Packaging status](https://repology.org/badge/vertical-allrepos/harfbuzz.svg?header=harfbuzz)](https://repology.org/project/harfbuzz/versions)

</details>

[1]: https://docs.microsoft.com/en-us/typography/opentype/spec/
[2]: https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6AATIntro.html
[3]: https://github.com/harfbuzz/harfbuzz/releases
[4]: https://github.com/harfbuzz/harfbuzz
[5]: http://mces.blogspot.com/2009/11/pango-vs-harfbuzz.html
[6]: http://behdad.org/text2024
[7]: https://goo.gl/FSIQuC
[8]: https://goo.gl/2wSRu
[9]: http://behdad.org/download/Presentations/slippy/harfbuzz_slides.pdf
[10]: https://goo.gl/woyty

To enable HarfBuzz bindings for Python among other languages, make sure
you have latest version of gobject-introspection available.  On Ubuntu,
you can install that this way:

```bash
sudo apt-get install libgirepository1.0-dev
```

And then run `meson setup` and make sure that `Introspection` is reported
enabled in output.

If you are building with Visual Studio, it is recommended that Visual Studio
2019 or later is used for this build, for the best build experience.

Compile and install.

Make sure you have the installation lib dir in `LD_LIBRARY_PATH` (or the
installation DLL dir in `PATH` for Windows systems), as needed
for the linker to find the library.

Then make sure you also have `GI_TYPELIB_PATH` pointing to the resulting
`$prefix/lib/girepository-*` directory.

Make sure you have pygobject installed.  Then check that the following
import works in your Python interpreter:

```python
from gi.repository import HarfBuzz
```

If it does, you are ready to call HarfBuzz from Python!  Congratulations.
See [`src/sample.py`](src/sample.py).

The Python API will change.  Let us know on the mailing list if you are
using it, and send lots of feedback.