[haiku-bugs] Re: [Haiku] #7354: usb_hid tablet support
- From: "stippi" <trac@xxxxxxxxxxxx>
- Date: Mon, 06 Jun 2011 08:11:20 -0000
#7354: usb_hid tablet support
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Reporter: lt_henry | Owner: mmlr
Type: enhancement | Status: in-progress
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/Development
Resolution: | Keywords: usb_hid
Blocked By: | Blocking: 6821
Has a Patch: 1 | Platform: All
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Comment (by stippi):
Awesome progress on the tablet support!
I would like to point out that the Wacom tablet driver should be tossed
out once the HID based support is ready. And of course if my assumption is
correct that all Wacom tablets that the driver supports are indeed HID
devices. Since the wacom kernel driver does the exact same initialization
to put the tablets into absolute mode regardless of model, I would believe
that to be the case, though.
The only thing that the Wacom add-on has over the tablet_device add-on is
the filtering of the movement. A hand holding the pen is just too jittery
for the precision of these devices. There needs to be some kind of low-
pass filter applied. Ideally, if the user is holding the pen "still"
hovering the tablet, there would be no movement messages generated and the
pointer should not move on the screen. This obviously depends on the size
of the tablet as well, which is something BTW, which the Wacom driver
ignores completely. It only work well for the Intuos 2 A5 size. Since it
probably also depends on the human holding the pen, it needs to be a
setting in a preflet anyway. When the pressure changes (i.e. pen is down),
it is important to generate messages, even when the movement filter keeps
the position locked for the jitter range.
--
Ticket URL: <http://dev.haiku-os.org/ticket/7354#comment:26>
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