[vlc-devel] [PATCH] USF subtitles enhancements

[Bernie Purcell]

This patch brings the USF subtitle support more in line with the spec by
adding support for additional features. It is still not complete, but
the patch was quite big enough already at this point. :-/
It does the following:
* Add a control method to mkv.cpp to allow retrieval of attachments
within the MKV container.
* Add a shortname to sdl_image so we can do a module_Exists() on it
* Add support for <image> tags in the subtitles to display graphical
images embedded as attachments as part of the subtitles
* Add support for multiple text / image regions within the one sub
picture plane - all with different alignments
* Allow style information to be overridden by explicit alignment tags
* Make USF styles relative to Default, as per spec, and allow font sizes
to be relatively changed by + and - in the attribute
* Patches to vout_subpictures.c to allow for regions within the
subpicture to have different alignments to one another, and minor
patches to everything else that tried to setup subpicture alignment, so
that it now sets this up on the subpicture_region instead.
* Extensive changes to freetype.c to correct a problem with styled
bi-directional text not being implemented correctly the first time
round.

I am aware of a problem that is occurring at the moment, when the video
area is resized to be less than 1:1 - everything swaps to a centre
alignment (see sample mkv file). I haven't managed to work the cause
yet, but as it is getting difficult to continue working on a monolithic
patch this size with other contributions impacting it I thought I'd
submit now before anything else changes. Perhaps some of it at least
could be committed and alleviate this issue?
The attached mkv showcase the new features added. Not all the features
requested by the file are implemented, but it's another step towards
full compliance.

Bernie
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