commit | 7bbacb9b221e2b3f2ab502783d31f8cc022be942 | [log] [tgz] |
---|---|---|
author | Jacek Fedorynski <jfedor@gmail.com> | Wed Mar 06 21:56:56 2019 |
committer | Stéphane Marchesin <marcheu@chromium.org> | Wed Mar 27 21:29:03 2019 |
tree | 8dc62d328c9f9f12e6181ecca713c987acf1bd7c | |
parent | 9a0c42293ce59f2cb0dd11a80df8382d4775dac5 [diff] |
frecon: Fix black screen regression Fix for bug 906387 (change 1341411) included a mostly unrelated change to VT1 behavior that had some unintended consequences for recovery and boot messages. This reverts that part of the change. BUG=chromium:933314, chromium:931524 TEST=TBD Change-Id: Ic2a7e4395919b8a8f6136889407144e0cccabebe Reviewed-on: https://chromium-review.googlesource.com/1505582 Commit-Ready: Grant Grundler <grundler@chromium.org> Tested-by: Dominik Behr <dbehr@chromium.org> Tested-by: Stéphane Marchesin <marcheu@chromium.org> Reviewed-by: Dominik Behr <dbehr@chromium.org> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org> (cherry picked from commit 83776b7bc992b0e43e95c5b94885a3ce4d7d6c00) Signed-off-by: Stéphane Marchesin <marcheu@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/frecon/+/1541690
This is a terminal emulator that replaces the kernel Virtual Terminal (VT) console. It uses the Kernel Mode Setting (KMS) support in the kernel. It is similar to the kmscon project: https://www.freedesktop.org/wiki/Software/kmscon
A new project was created (rather than re-using kmscon) because:
However, it‘s not as bad as it sounds! We haven’t re-implemented our own terminal emulator -- we use the same library that kmscon does: libtsm. That's the much more tricky part too.
For even more details, check out the design doc in this repo.
--clear=color
Specify clear color for splash screen terminal. The color is 32-bit integer in a framebuffer format (ARGB) in any format supported by strtoul.--daemon
Daemonize frecon.--enable-gfx
Enable image and box drawing OSC escape codes.--enable-vts
Enable additional terminals in addition to splash screen.--enable-vt1
Enable switching to VT1 (aka splash screen) and keep a terminal on it after finishing splash animation.--frame-interval=N
Specify default time (in milliseconds) between frames of splash screen animation.--loop-start=N
Specify frame to start splash animation loop. This option also enables the animation loop.--loop-count=N
Specify number of splash animation loop repetitions. Default of 0 repeats forever. Looping has to be enabled using --loop-start
.--loop-interval=N
Specify default time (in milliseconds) between frames of loop animation.--loop-offset=x,y
Specify default offset to centered image in loop.--no-login
When additional terminals are enabled do not display login prompt on them. Can be used by scripts to display debugging information and logs on additional terminals.--num-vts=N
Specify number of enabled VTs. The default is 4, the maximum is 12.--offset=x,y
Specify absolute location of the splash image on screen.--pre-create-vts
Normally VTs are create on demand the the user switches to a VT. In some cases it may be necessary to pre-create them at startup, for instance to write a log or debug output for them while they are not active so it can be examined later. This option allows for that. This option also ensures daemon parent waits for daemon child to finish initalization so consoles are created by the time daemon parent exits.--print-resolution
Print detected screen resolution and exit. Deprecated.--scale=N
Set default scale for splash screen images. The scale is a positive integer number. Default scale is 1. 0 has a special meaning - using scale 1 for screens with horizontal resolution lower and equal than 1920 and 2 otherwise. Scale affects image/box size and offset.--splash-only
Exit immediately after finishing splash animation. Otherwise frecon will wait for DBUS signal (LoginScreenVisible) from Chrome before exiting when extra terminals are not enabled.--image=/path/to/image.png
--image-hires=/path/to/image.png
or any image file name specified after options Add image to splash screen animation. --image
and --image-hires
are added conditionally depending whether horizontal or vertical screen resolution is above 1920. This allows frecon to make runtime decision which set of images to use instead running frecon first with --print-resolution
option and making this decision in a script that invokes frecon. Free form image file name in the command line are added unconditionally.Frecon implements rudimentary functionality to display images and draw single color boxes on the terminal screen using OSC (Operating System Command) based terminal escape codes.
The OSC sequences always start with ESC+] (\033]
) and end with either the String Terminator (ST) sequence (\033\\
) or a BEL (\a
) character.
Two escapes are implemented, all escape parameters can be specified in any order.
image:file=/full/path/to/file.png;location=x,y;offset=x,y;scale=s
box:size=w,h;color=c;location=x,y;offset=x,y;scale=s
location
is the absolute location on screen.offset
is an image offset starting with image centered on screen.color
is a 32-bit number in the same format as --clear
command line argument, it defaults to 0
.size
is two integer numbers.scale
is integer scaling factor applied to image size or box size.Examples:
printf "\033]image:file=/usr/share/chromeos-assets/images_100_percent/boot_splash_frame18.png\a" > /dev/pts/1 printf "\033]box:color=0xFFFFFFFF;size=100,100\a" > /dev/pts/1
An escape code can be used to enable/disable keyboard input processing on a terminal. The setting is stored per terminal and applies to input “within” terminal. Swithing between terminals, scrolling, backlight control etc remains operational.
input:onoff
onoff
is one of: on,1,true or off,0,falseExamples:
printf "\033]input:on\a" > /run/frecon/vt0 printf "\033]input:off\a" > /run/frecon/vt1
Frecon creates the following files and links in /run/frecon
directory:
/run/frecon/pid
which contains pid for frecon daemon process (only when --daemon
is specified on command line).
for every VT it creates, a link from /run/frecon/vt%u
to /dev/pts/X
where %u
is terminal number from 0 to num-vts - 1 so the user can determine which VT uses which pts since pts number assignment is not deterministic.