Touchscreen support for VMs (#3887, #3337)
Alex Barinov
Hi there,
I implemented passing touch events from dom0 to guest vms. This code allowed me to scroll pages with my finger in Chromium with no additional configuration, 'xinput text-xi2' reports touch events in vms. The implementation is split across 3 repos:
https://github.com/a-barinov/qubes-gui-common.git
- Adds touch evens support to the qubes gui protocol
- Bumps protocol version to 1.4
https://github.com/a-barinov/qubes-gui-daemon.git
- Adds touch events processing to qubes-guid
- Does not (yet) support passing touch pressure or touchscreen
buttons (e.g. stylus with buttons) to vms, this shall be
relatively easy to add though.
- introduces new dependency to xinput. I hacked this into
Makefile (-lXi), not sure if 'pkg-config --libs Xi' is needed
instead. I have no idea how to add this dependency to
build-depends for deb or rpm so I just installed xinput-dev to
the build environment.
https://github.com/a-barinov/qubes-gui-agent-linux.git
- Adds touch event processing on vm side
- Does not yet support multitouch, touch pressure or touch
buttons
- Initial goal was to add touchscreen emulation to
xf86-input-mfndev. This turned out to bee pretty difficult
(almost no into on how to write a new touchscreen x11 driver) so
I opted to just focus the recipient window through the driver
and create an evdev touchscreen device instead.
- Touchscreen device uses the same resolution as X server on vm
startup; no dynamic reconfiguration is supported
- introduces
new dependencies to libevdev and libevemu. I hacked this into
Makefile, not sure if pkg-config is needed instead.
- This implementation requires xserver-xorg-input-libinput
(debian package name) to be installed in vms for X server to see
the touchscreen. I have not added this as recommended or
required package dependency.
Notes for all repos:
- All the changes are ifdef'ed with '#ifdef XI2'. Removing
'#define XI2' will fall back to the original code
- My touchscreen device (GPD Win2) died at the end of this
development. Touch pressure and stylus buttons support will be
added after I get a new laptop.
Happy to receive any feedback as I'm keen to see guest touchscreen support mainlined into qubes.
Kind regards,
Alex