[MPlayer-dev-eng] equalizer for vo_X11 & vo_gl2 - patch

[lucho]

here is a somewhat generic equalizer implementation for the X11 vo drivers using the window's colormap.
the patches are for vo_x11 and vo_gl2 only, but it can be used easely for vo_gl, and
with a little bit of additional codding for vo_dga.
this method is using the video card's hardware gamma ramp so it involves no performance penalties at all.
this way we can do gamma, brightness, contrast, hue and red/green/blue intensities, but
we cannot do saturation. I implemented brightness, contrast and gamma but tested 
only brightness and contrast (why there aren't keys for adjusting gamma).
the patches are relative to <mplayer_src_dir>/libvo

lucho

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