[MPlayer-dev-eng] update to the speedup patch

[Jim Hauxwell]

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Hi,

So I had a think about the lock/unlock situation.

1) No resource conflict, its not like other threads are going to be
grabbing the render surface.
2) Its an off screen buffer so it wont affect the display.

I have concluded that it should be OK to lock it once in draw_slice()
and then unlock it before doing the blit to get it onto the back buffer.

Its also a little more flexible in the draw_slice() as my previous patch
ignored the x offset for slice decoding, which would have broken for say
mpeg2 with multiple slices per line.  Its now reverted back to using the
original calculations in this respect.

Jim
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