Op 02-08-10 14:29, Henrik Rydberg schreef: > On 08/02/2010 02:13 PM, Éric Piel wrote: : >>> The above tells me that the MT situation did not improve much, and that the >>> major improvement is to paper over the synaptics problem. >> For me it has changed because my argument was "with two finger we report >> crap anyway, so let's report the average". With the tracking, we >> actually (often) report the real position of the fingers, so this >> argument is not valid anymore. Now we can happily say we conform to the >> official protocols: ST (which apparently requires to always reports an >> actual position), and MT-A. > > > It does not comply with MT-A as long as two semi-random corners of a rectangle > are reported. Fair enough. Without the tracking patch it complied with MT-A 50% of the time, with it it's 75% of the time... I guess it's still not called "complying" ;-) >>> The argument to go forward implementing protocol B is that the current patch >>> actually does proper two-finger tracking to the extent that it is possible. >>> Since mtdev cannot improve the fact that this device does not following fingers >>> but corners, it makes sense to treat this device specially, and implement the >>> extra lines in the kernel to make it as good as it can be. Alternatively, one >>> can give up the idea of using MT in this driver altogether, and just implement >>> the mean position ABS_X/Y, old-style. >> Do you think that if we implement full tracking in kernel, we can do >> _better_ than the small tracking + mtdev? I don't think so (but, hey, >> I've been tinkering with multitouch for something like 20h in my life, >> so I might have missed something ;-) ). If you have in mind a better >> performing algorithm, then let me know, and I'll happily implement it in >> kernel :-) > > > We can do better in the sense that since the device cannot comply with MT-A, we > can do as close as possible to MT-B with less cpu usage. But frankly, the best > solution at this stage seems to be to drop MT handling altogether, since there > does not seem to be any plan to use it. Ah, this alternative solution is a bit boring ;-) In addition it's not compatible with my own master plan to eventually have the "pinch to zoom" and "rotate to rotate" gestures work on my laptop, like in Windows ;-) So, let's agree on just the two patches I'm going to send to support "better than nothing" MT-protocol for now. When, later, someone has better ideas, he can send patches to improve MT-protocol support/compliance. Fine? Eric -- 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
