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.