[dx46] fixes renders lock and surface debug code (snapshots)

[Raphaël Junqueira]

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Hi,

This patch fix some a stupid bug i had already solved but i forgot to 
copy/paste ... I'll take a brown paper bag.

Changelog:
  - fix another time the stupid bug of locking (i had already fixed in 
ActiveRender)
  - fix stupid rescaling of colors values on SaveSnapshot

PS: Jason, this patch should fix your problem

Regards,
Raphael
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