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

[Henrik Rydberg <rydberg@euromail.se>]

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.