Utilities for screen capturing for dev/test images for working with screen capture.
Provides a screenshot of the current display. Useful for capturing what's on the display when test has failed, for example. Not all devices are supported yet, so your mileage may vary.
VNC server using the same infrastructure as screenshot for grabbing display.
Here’s a quick rundown of how to use kmsvnc.
(DUT)# kmsvnc
VNC server will start listening on port 5900. Forward the port with SSH from your client, and connect through the port. Example:
(workstation)$ ssh -L 5900:localhost:5900 DUT
Then connect using a VNC client, such as VNC Viewer for Google Chrome to localhost:5900. It will ask you if you want to connect unauthenticated, here we are relying on ssh forwarding to restrict who can connect.
For development I typically deploy to /usr/local/ because tests expect them there.
$ BOARD=rammus-arc-r
$ setup_board --board=${BOARD} # required only once per board.
$ cros_workon --board=${BOARD} start screen-capture-utils
$ emerge-${BOARD} -j 100 chromeos-base/screen-capture-utils
$ cros deploy --root=/usr/local/ localhost:2229 chromeos-base/screen-capture-utils
$ tast run localhost:2229 graphics.KmsvncConnect
$ tast run localhost:2229 graphics.Smoke.platform
For debugging I typically need to deploy to /usr/sbin, from inside chroot
$ cros deploy localhost:2229 chromeos-base/screen-capture-utils
$ gdb-${BOARD} --remote=localhost:2229 /usr/sbin/kmsvnc
There are three major types of boards that this code handles. The flags --method=bo or --method=egl would try to force which method is being used.
Kernel before 4.4 do not have getfb2 ioctl backported, so they will use the --method=bo. This does not support multiple planes and assumes framebuffer is readable in ARGB format.
Development was done typically with caroline.
framebuffer is converted every frame to ARGB format using EGL call. This depends on getfb2 ioctl being available, which is only available on kernel 4.4 or later.
Development was done typically with samus.
planes are scanned and merged so that when multiple planes are being used they are correctly rendered.
Development was done typically with rammus.