lkml.org 
[lkml]   [2010]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev2)
From
On Wed, May 19, 2010 at 5:26 PM, Rafi Rubin <rafi@seas.upenn.edu> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 05/19/10 20:13, Ping Cheng wrote:
>> On Wed, May 19, 2010 at 4:34 PM, Rafi Rubin <rafi@seas.upenn.edu> wrote:
>>> My understanding is that it would be more like
>>> +   SYN_MT_SLOT 0
>>> +   ABS_MT_POSITION_X x
>>> +   ABS_MT_POSITION_Y y
>>> +   SYN_REPORT
>>> +   SYN_MT_SLOT 0
>>> +   ABS_MT_POSITION_X x
>>> +   ABS_MT_POSITION_Y y
>>> +   SYN_REPORT
>>> +   SYN_MT_SLOT 0
>>> +   ABS_MT_POSITION_X x
>>> +   ABS_MT_POSITION_Y y
>>> +   SYN_MT_SLOT 1
>>> +   ABS_MT_POSITION_X x
>>> +   ABS_MT_POSITION_Y y
>>> +   SYN_REPORT
>>
>> You are right if one slot only has or is only allowed to have one
>> point. My scenario is that one slot can have more than one point.
>> Basically, my intention is to utilize the MT_SLOT and MT_TRACKING_ID
>> in such a way that it avoids as much overlap as possible.
>>
>> And hopefully it makes sesne in the reality too.
>
> Please clarify by what you mean by more than one point.

I might have been confused myself by ABS_MT_BLOB_ID and SYN_MT_SLOT
here. What I meant by "more than one point" is a contact (or touch, I
am not sure which one is the right term :) is represented by a few
(x,y) coordinates. Maybe we should use SYN_MT_SLOT for my case?

> I may be misunderstanding, but I thought that these slots are basically a
> superior replacement to tracking id.
>
> one finger -> one slot

This is what I needed to understand. Is slot for one (x,y) only or can
it also be used for more than one set of (x,y)?

> But with slots we can use the filtering that input provides, which we've been
> by-passing with the existing MT protocol (at least that's what I think Henrik's
> goal is).

Good to know that filtering has already been considered. I know I must
be out of sync with Henrik's goal. That's why I wanted to show my
ignorance :).

Ping
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2010-05-20 02:53    [W:0.059 / U:0.540 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site