Hi Ping, On Sat, Mar 20, 2010 at 10:21 AM, Ping Cheng <pinglinux@xxxxxxxxx> wrote: > On Fri, Mar 19, 2010 at 3:58 AM, Henrik Rydberg <rydberg@xxxxxxxxx> wrote: >> Hi Dmitry, >> >> there is an ongoing discussion about adding multitouch to X >> (http://lists.x.org/archives/xorg-devel/2010-March/006206.html), which is >> beginning to take on more solid form. >> >> One of the suggestions emerging from that discussion is to add the software >> finger tracking to the kernel. Back in summer 2009 when I thought about this, I >> disregarded it as being too experimental. I have since then reconsidered, >> starting to think it really is the right place. >> >> The MT protocol allows applications to take advantage of multi-contact hardware, >> but leaves the problems of finger tracking and filtering to the user. Arguably, >> no application can make good use of MT without these, so the problem is pushed >> forward, in this case to evdev or equivalent. >> >> The knowledge of signal-to-noise ratios and prior input states resides in the >> kernel. Because of this, the finger matching and filtering would naturally >> reside within the kernel. >> >> So, if there were to appear patches to include matching in the input core, would >> you consider them? :-) > > I support the idea to add a tracking ID and a filter to _MT_. I'd > also like to make the filtering method more "device driver developer" > friendly, i.e., give the developer the option to turn the filter on or > off. If you plan to use a constant for the filtering method, please > allow the developer to choose that constant too. > > Another attribute associated with _MT_ is the pressure/capacity. > Report this value would offer more room for MT-aware application to > add new features. We have ABS_MT_PRESSURE added recently. I hope you are asking the same. -- ---Trilok Soni http://triloksoni.wordpress.com http://www.linkedin.com/in/triloksoni -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
