[Yt-dev] Call for testing: Freetype module build system

[Matthew Turk]

Hi all,

I wrote up a very simple wrapper to do textual annotations directly
using Freetype.  This allows, for instance, adding annotations to
image buffers created by fixed resolution buffers, volume rendering,
etc.  It should, eventually, also allow us to make a subset of plots
with colorbars without using Matplotlib.

Anyway, I've already added freetype to the yt build system.
Additionally, matplotlib requires it.  So it *should* already exist on
the system, although I've had to add some guesswork to get the yt
build system (not the install script) to link against the freetype
wrappers.

I've bundled up the changes and attached them to this email.  It would
be amazing if I could have a couple people try unbundling these
changes, updating to hash 2f9479b4f1dd, re-cythonizing and attempting
a build.  This process should look something like:

hg unbundle freetype.hg
hg up -C 2f9479b4f1dd
cython yt/utilities/amr_utils.pyx
python setup.py build_ext -i

Testing this will help to make sure that we can push the new freetype
module out into the wild, and use it more generally for annotating
volume rendering, etc etc.  You can see the (documented!) function as
"annotate_image" which should be in mods, and which accepts a bitmap
(as, for instance, output by write_image) as input.

Any reports of success/failure would be great.  Thanks!

-Matt
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