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

[Jim Hauxwell]

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This should be compared to locking all of it for the first slice and
unlocking only directly before the StretchRect (or before the BeginScene
if combined with your other change).
I am not sure that the LockRect/UnlockRect are low enough overhead that
you actually gain something by having more than one DMA transfer.


I considered this, but microsoft docs say that you should not hold a
lock open for a long time, so I went with this approach.

The other issue you get into is that you could have a surface which is
held in a locked state and therefore not discarded properly.

I think there is already an issue with lost surfaces through the
IDirect3DDevice9_CreateOffscreenPlainSurface() call.  I need to check up
on that.


I may have lost the plot here, but why does it 'have to be a separate
patch'?  Its a performance increaser patch which does exactly that.  All
the issues in the patch are to do with performance enhancement.


Jim
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