[Bug 1688] Enhancement/fix to the mouse acceleration code

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https://bugs.freedesktop.org/show_bug.cgi?id=1688        
   




------- Additional Comments From Jan_B at gmx.ch  2004-12-07 08:52 -------
> [..]there's no reason to jump through hoops and introduce extra struct
> fields to avoid using floats.
That's what I thought first but after some input from Jim Gettys and Keith
Packard, I found out that casting from float to integer is very slow in C, at
least with x86 cpus. Additionally, there are target platforms that don't have a FPU.

For desktop computers, the difference is not noticeable of course, even with
future 10'000 Hz mice but without an FPU, this could make a system crawl. :)

I don't know what others think but I now like the integer version better. I hate
to waste CPU time even if it's not much. Plus the integer version is
theoretically more accurate.

I guess the mouse acceleration code is going to be revised to a more
sophisticated algorithm in the future anyway so I don't care a lot about which
patch gets accepted now as I see it as a needed fix.        
   
   
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