Re: [PATCH] input: mt: Add an envelope tool type

[Henrik Rydberg]

On 12/09/2010 02:38 AM, Mohamed Ikbel Boulabiar wrote:

> On Thu, Dec 9, 2010 at 1:06 AM, Ping Cheng <pinglinux@xxxxxxxxx> wrote:
>> No, we are not talking about non-rectangular shape here. Envelop is
>> always a rectangle. By rectangle above, I meant 2 touches.
>>
>> An envelop that includes number of touches offers us more information
>> than a rectangle does
> 
> Can we have more information that just a rect ? An ellipse for exemple.
> Can we get this information at least from synaptics touchpads?


Unfortunately not. Chris Bagwell and myself have been experimenting with quite a
few different approaches to extract touch information from the synaptics pads.
The present approach, to extract the bounding rectangle, is the best we can do,
I am afraid - at least with the information unveiled in Takashi's original
patch. In particular, rotation information is not reliably extractable.

Henrik
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