[MPlayer-dev-eng] Subtitles drawn in YUV mode get the color of the background.

[Artur Zaprzala]

Subtitles drawn on background with highly saturated colors are not white 
(only for YUV output).

This patch applies alpha to chromaticity components.

It is only for C code and for yuy2 mode. It would be nice if someone who 
knows MMX corrected asm code.
As for vo_draw_alpha_yv12, there is not enough data passed to this 
function to access U and V planes.


-- 
Artur Zaprzała
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