[Bug 15789] Icewind Dale 2 : very low framerate

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=15789





--- Comment #10 from Vincent Povirk <madewokherd at gmail.com>  2009-04-07 14:12:45 ---
I looked into this a little bit a while back and neglected to post the
information on the bug. That means I have lost some details.

Profiling Worms: Armageddon showed that most of the CPU time was spent doing
8-bit -> 24/32-bit image copying (palette mapping). I believe this result is
the same as from before the regression.

I also found that the copying was in response to ddraw functions like BltFast
and Flip. I believe that BltFast would in the past have been an 8-bit -> 8-bit
copy and not required until the final Flip when we do palette mapping on the
entire frame. This leads me to believe that some surfaces are now being created
as 24/32-bit, when they should be 8-bit.


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