On 01/17/2016 02:26 PM, Peter Hutterer wrote:
On Fri, Jan 15, 2016 at 12:06:27PM -0800, Bill Spitzak wrote:
Isn't dx_unaccelerated exactly equal to the differences between x values?
hah, yes. indeed. that actually means we can drop it from the API since a
client can use the mm value instead, they are effectively equivalent (but
more useful) than the raw device coordinates and account for uneven
resolution better anyway.
I think the following text is confusing and is what led me to think that
the coordinate systems might be different:
>>> +libinput calculates the relative motion vector for each event and
converts
>>> +it to the same coordinate space that a normal mouse device would use.
I guess that all coordianates except for raw ones are "converted to the
space that a normal mouse device would use" but this seems to imply that
dx/dy are special. Maybe this text can be moved somewhere to make it
clear it applies to everything other than raw output.
Whether you use the device in an absolute or relative mode is a very
user-specific thing, I doubt you can handle this automatically. mode is also
a very tool-specific thing, you may want the mouse to be in relative mode
but the pen in absolute mode.
Although some devices such as the mouse may want to be in relative mode
all the time, I believe the "absolute" devices will want to be in
relative mode if the mapping from the tablet to the screen is either too
large of a scale-up (ie the screen is much larger than the tablet) or
the aspect ratio is significantly different (though this might just mean
that one dimension is scaled beyond a maximum). This is certainly true
of my current setup and I can't believe it is uncommon. Absolute mode on
this tablet is completely useless! Except for programs that restrict the
motion to a smaller window that is about the shape of the tablet.
I think this would also help it guess the correct mode automatically
when the user changes their tablet or their screens.
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