Messages in this thread | | | Date | Sun, 19 Feb 2017 20:05:47 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation |
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Hi!
> Hi Pavel, > I love discussions with you :)
Unfortunately I can't say the same.
> > Am 19.02.2017 um 18:15 schrieb Pavel Machek <pavel@ucw.cz>: > > > > > >>> Solve it properly. That means passing calibration > >>> data from kernel to userland. > >> > >> As written before, the really proper solution would be to provide floating > >> or fixed point subpixel input events. Not arbitrarily scaling up in kernel > >> and leaving downscaling to user space (where everybody can make it > >> worse). > > > > That has no advantages, > > It has the advantage of providing you with the full precision of raw data (but > properly scaled) so that you don't loose any bit of information. This is what > you just asked for - one or two mails before.
Not really, right? No matter what kind of fixed point you introduce, you'll still loose precision.
> > and floating point in kernel is hard. Also > > you'd either have to invent new interface, or you'd break touchscreen > > for people that already have their touchscreens calibrated. > > No, I don't break calibration for people using a different chip.
So you propose your touchscreen to behave differently from all other touchscreens in tree? That's just no-go.
> > Yes, that's not really proper solution, that just overengineered. Not > > worth implementing. Pass calibration data to userland. > > You seem to repeat yourself and just say which solution you prefer, > but I am missing the arguments why your solution (Pass calibration data > to userland) is right and the best one. > Which problems does it solve?
All you described.
> Which one does it solve better than others?
It is not terminally ugly.
> How can you implement it in > a stable and portable way?
Easily.
> How can you make sure that all user-space GUI > systems can and will make use of this calibration data?
You can't, and you don't need to.
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html [unhandled content-type:application/pgp-signature] | |