#3 Send multi-point events

[David Sporn]

Being able to extract multipoint from packet data, then send each point to the system, if it supports multi point.

[David Sporn]

ok, after a few search on the subject (about MPX, and I found a thread on the mailing list of xorg "Multitouch support, step one"), things are not very well defined, yet.

On the other hand, the sample output of a multitouch device given to me seems to track a finger as long as it touches the device.

So, I will do it like that, for now :
- Define 2 evaluators per supported touch on the device
- the "first touch" (first subgroup of packet in a row) will be standard event (like today)
- any other touch will use corresponding valuators, and for button, it will send a button code along the position of the corresponding valuator, but I don't know which code to send, so there will be 2 strategy : always send a "left" button event, but with different evaluator, OR send another button code, with a customizable offset (in order to skip right, middle button, wheel, etc...)

[David Sporn]

see also this page :
http://lii-enac.fr/en/projects/shareit/xorg-howto.html

[David Sporn]

after reading the previous links, it appears I need to do the following :
- write a "subdevice" driver
- create as much of virtual devices using said "subdevice" driver as the number of possible touch. Each subdevice is assigned an order, and touch #n is send as an event to subdevice #(n -1), if n > 1 (n=1 is viewed as the normal touch)
- each subdevice, on receiving the event, send a real event. (post button/post motion)