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    Inverse Scrolling and CPU usage

    Discussion in 'Apple and Mac OS X' started by SP Forsythe, Apr 24, 2011.

  1. SP Forsythe

    SP Forsythe Notebook Evangelist

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    It is understood that when using Inverse Scrolling within Better Touch Tool, CPU usage is significantly increased.

    Does anyone know if the same thing happens when enabled within Lion, using Lion's built-in trackpad preference ?
     
    SP Forsythe, Apr 24, 2011
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  2. Starfox

    Starfox Notebook Evangelist

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    I'll make an educated guess and say: probably not.

    For BTT to change that it needs to intercept and modify the message pipes of processes, so that's where the overhead comes from. In Lion it'll be part of the driver so while, yes, it will theoretically add some work it should be miniscule and unnoticable - such a thing can be implemented in the driver with a simple bitwise-or of the sign bit of the movement direction.
     
    Starfox, Apr 24, 2011
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  3. konceptz

    konceptz Notebook Consultant

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    Quick sidetrack: Why would you OR a sign bit regarding movement?
     
    konceptz, Apr 24, 2011
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  4. Starfox

    Starfox Notebook Evangelist

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    Er.. you're right, I don't know why I said that - You need to NOT the sign bit and that'd reverse the direction - my bad.
     
    Starfox, Apr 25, 2011
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  5. konceptz

    konceptz Notebook Consultant

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    Either way it would be fast. :)
     
    konceptz, Apr 26, 2011
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