[MPlayer-dev-eng] Colored subtitles

[Jindrich Makovicka]

Hello,

here is a patch for 24-bit color subtitles. Current version is broken 
but I am sending it to allow coordination with the color support for spudec.
The subtitles are first rendered in 24-bit RGB+A into obj->rgb_buffer & 
obj->alpha_buffer and then converted from RGB to destination colorspace 
into obj->dest_buffer using vo_convert_osd_format(). Spudec currently 
uses some other way of buffering but IMO it'll be reasonable to make it 
use the buffering code from sub.c too.

Stuff that (probably) works: xv (YV12) x11 (tested with 32bit), sdl (32bit)
Stuff that surely doesn't work: spudec, aalib, anything yuy2 & uyvy

Interface changes: vo_draw_text and vo_remove_text now have one more 
argument for desired image format, vo_draw_alpha_yv12 has additional 
args for more layers.

-- 
Jindrich Makovicka

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