[MPlayer-dev-eng] Update to vo_direct3d - saves ~2% CPU time

[Jim Hauxwell]

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Hi,

I've made some updates to vo_direct3d.c which reduce the amount of data
locked, now only locks the portion needed for update which should save
DMA bandwidth.  I've optimized away some begin_scene and end_scene
combos as they are only needed for actual rendering, not the locking.

I've attached the patch created against what was in svn today.

I still think there will be some issue with lost surfaces, I'll look at
that next.

Jim
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