linux-kernel - Re: [PATCH 2/2] input: Add a detailed multi-touch finger data report protocol (rev2)

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Date:	Mon, 05 Jan 2009 19:55:26 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Peter Hutterer <peter.hutterer@...-t.net>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, jg@...top.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] input: Add a detailed multi-touch finger data	report
  protocol (rev2)

Peter Hutterer wrote:
[...]
> 
> To clarify: the MT_TOUCH_MAJOR is to track a touchpoint over time, and the
> BLOB_ID to compile a arbitrarily shaped touchpoint within the same event?

MT_TOUCH_MAJOR is the major size of the touching object, or "pressure" in
case the size of the approaching object (MT_WIDTH_MAJOR) is not available
to compare the size to. The touch and position packets are sent to the
multitouch X driver, where the actual finger tracking takes place. Thanks
for the chance to clarify this.


> Would it make sense to allow specification of a blob as bit/bytemask? There
> are a few devices that can do detection of multi-color non-rectangular
> touchpoints, especially camera-based systems. Limiting these to a sequence of
> rectangles means dropping information that may be useful for certain tasks
> (e.g. fingerprint detection).
> OTOH, a rectangle as bounding box with an accompanying (optional) bytemask can
> pass this data on to prospective clients.

Very interesting idea, although I believe it is beyond the scope of the
current patch.

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