Peter Hutterer wrote:
On Fri, Apr 15, 2011 at 12:11:09PM -0400, Michael Smith wrote:
Hi,
I have an Intel 915GM with two heads, each 800x600. One head feeds a
touchscreen using the mutouch driver. Touchscreen input is being
scaled by the total screen dimensions (1600x600), rather than just
the 800x600 part of the display that is connected to the
touchscreen.
Where is the right place to add a way to override the screen width
used for converting raw coordinates? Or is there already a way to do
this?
http://www.x.org/wiki/XInputCoordinateTransformationMatrixUsage
run-time only though
Thanks! I ended up doing something similar by fiddling with negative
MinY/MaxY values.
It's encouraging to know I'm not the only one with this use case (i.e.
Wacom tablet users also solve the same problem).
The transformation matrix may be a decent way to implement this
internally, but as a user interface it's pretty awful - it would be nice
to have a knob that says input device X is associated with the bounds of
screen Y so you don't have to manually recalculate your matrix if you
dynamically add or remove a screen or change a resolution.
Mike
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