[PATCH] improved mouse pointer acceleration

[Daniel Stone]

On Tue, Jun 05, 2007 at 10:50:27AM +0200, Simon Thum wrote:
> Daniel Stone wrote:
>> On Mon, Jun 04, 2007 at 08:09:34PM +0200, Soeren Sandmann wrote:
>>> It looks like your patch simply hardcodes a bunch of acceleration
>>> scheme. Did you consider writing a new extension that would allow
>>> clients to set the acceleration scheme more generally, say be
>>> uploading the coefficients of a polynomium of something?
>> Don't write a new extension.  We already have device controls for this.
> Right, and they can be used to tune the functions.
> But on the other hand, it would be desirable to have more felixbility on 
> the long run, e.g. in MacOS you can supply a function defined 
> point-by-point (probably interpolated somehow).
>
> This could be added without breaking ABI after the patch is in, since it 
> bears some extension points (though no extension of its own). I have 
> avoided hardcoding stuff. New profiles can be introduced easily, it's just 
> a matter of configuration to select them.
>
> However, 'uploading coefficients' is one of the things I would like to have 
> but I decided to see if input-hotplug will ship with an approriate 
> (generic?) runtime device configuration mechanism. Maybe I just missed it?

You can pass arbitrary data through X{Change,Get}DeviceControl.  Just
define a new DEVICE_foo and new control structures.

Cheers,
Daniel
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