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.. index::
pair: driver; AA-lib
pair: platform; Unix
.. _aa:
AA-lib driver
=============
The AA driver is currently the most advanced and portable driver for XaoS. It
is based on AAlib--a high quality ASCII-art library developed by the
`AA-project`_.
.. _`AA-project`:
http://aa-project.sourceforge.net/
It is a fully featured XaoS driver for text mode displays. It supports 256
colors and the mouse where possible.
It also has some extended features available from the UI menu:
Attributes
AA-lib may use character attributes to improve image quality. By default it
uses normal, dim and bold characters where possible, but you can also
enable different attributes like reversed or bold font characters. You may
also enable usage of non ansii/reversed characters if your device supports
it.
Font
AA-lib uses a bitmap image of the font to prepare the approximation table
used for ASCII art rendering. This bitmap is expected to be same as the one
used by your device. AAlib performs detection where possible however some
devices (like UNIX text terminals or MDA) do not support this. AAlib has
few font images compiled in, so in this case you should try to use one of
them to achieve best results.
Inversion
Some devices use inverse video: use this to get correct results on such
devices.
Dithering mode
Dithering is an way to get more exact color in approximations, by combining
more characters; but this method can produce ugly looking noise on certain
images. Use this menu to disable or tune it.
Palette options
By default AA driver uses the XaoS palette to render images, but it quite
often looks ugly on text displays. Here you can choose a special text
palette instead. Note that with filters enabled, the results may be rather
ugly. This function is available from the **palette menu**.
Save text screen
The normal save function will generate a PNG image instead of nice
ASCII-art. To save ASCII art use this function instead. It supports many
text file formats like HTML, ANSI, more, etc... It will also ask you for
font and attributes(see above). It is available from the **file menu**.
The AA-lib driver also provides the full set of standard AA-lib's command line
options. You may use them to tune parameters like gamma correction, and so on.
See xaos -help or the AA-lib documentation for details.
The AA driver was written by Jan Hubicka, 1997.
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