MobileRead Forums - View Single Post - Clara HD Crosscompile a web browser for the KOReader terminal

elinkser · 09-18-2023, 05:18 PM

***ADD A CHESS GAME FOR THE TERMINAL***

Here's a chess app to stress test your fbpadkb, and have a little fun at the same time!

The gnuchess game has only the following dependencies:

Depends (3)
libgcc**
libintl
musl*

* Already got it from the Elinks/Nano install above (POST #3 - also got the /korenv.sh script.)
** Do not install libgcc since it would crash OCP-KOReader-v2023.06 when opening pdf files.
Fortunately, gnuchess runs fine without it!

RUN THESE COMMANDS FROM LINUX DESKTOP:

$ cd myalpine/

DOWNLOAD THE REQUIRED PACKAGES:

$ wget https://dl-cdn.alpinelinux.org/alpin...s-6.2.9-r1.apk

$ wget https://dl-cdn.alpinelinux.org/alpin...-0.21.1-r1.apk

$ tar zxvf gnuchess-6.2.9-r1.apk

$ tar zxvf libintl-0.21.1-r1.apk

$ mv usr/bin/gnuchess scripts/

$ mv usr/lib/libintl.so.8.3.0 libs/libintl.so.8

NOW CONNECT YOUR KOBO TO YOUR PC:

Copy your gnuchess binary from the scripts/ folder on the PC to the /mnt/onboard/.adds/koreader/scripts/ folder on the kobo.

Copy new lib from the libs/ folder on the PC to the /mnt/onboard/.adds/koreader/libs/ folder on the kobo:
libintl.so.8

Copy the usr/share/gnuchess folder on the PC to the /usr/share/ folder on the kobo:

PLAY CHESS FROM fbpadkb TERMINAL:

# . /korenv.sh

# gnuchess -e
GNU Chess 6.2.9
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
White (1) :

ENTER YOUR MOVE, E.G.:
White (1) : e2e4

1. e2e4

black KQkq e3

r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

Thinking...

white KQkq d6

r n b q k b n r
p p p . p p p p
. . . . . . . .
. . . p . . . .
. . . . P . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

My move is : d5
White (2) :

ENTER YOUR NEXT MOVE, E.G.:
White (2) : e4d5

2. e4d5

black KQkq

r n b q k b n r
p p p . p p p p
. . . . . . . .
. . . P . . . .
. . . . . . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

Thinking...

white KQkq

r n b q k b . r
p p p . p p p p
. . . . . n . .
. . . P . . . .
. . . . . . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

My move is : Nf6

SAVE YOUR GAME AND QUIT:
White (3) : pgnsave game1.pgn
White (3) : quit
#

PLAY AGAIN:
# gnuchess -e
GNU Chess 6.2.9
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
White (1) :

LOAD YOUR GAME AND QUIT:
White (1) : pgnload game1.pgn

white KQkq

r n b q k b . r
p p p . p p p p
. . . . . n . .
. . . P . . . .
. . . . . . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

White (1) : quit
#

With a little command-line labor you can install a GUI chess app in a graphical chroot, thanks to NiMa et al:
https://www.mobileread.com/forums/sh...d.php?t=336210

*Of course there is also Vlasovsoft's app which includes a fine GUI chess program.

Updated setup instructions starting from:
https://www.mobileread.com/forums/sh...4&postcount=53

Then just:
# apk add xboard
# xboard

TIPS FOR GETTING STARTED WITH GRAPHICAL CHROOT:

1) Start with the simpler non-graphical version of the chroot:
https://www.mobileread.com/forums/sh...d.php?t=336175

(You may find a script like the one in section 6 of this comment helpful.):
https://www.mobileread.com/forums/sh...1&postcount=46

***
CAUTION: You know how Nickel does all that background work when you connect USB cable to desktop, click "connect", then later unmount?

Well, there may be a risk of data corruption if you had a loop mounted file, e.g. Alpine chroot.
https://www.mobileread.com/forums/sh...38&postcount=2

So better don't try this. But if you DO connect a USB cable, either exit the chroot and unmount the loop first, OR click "cancel" and use SSH/Telnet networking instead. (I have done this for months.)
***

2) Try this site to get the tldr description of a Linux command e.g. the chroot command:
https://html.duckduckgo.com/html/?q=tldr+chroot

(You can change the "chroot" to some other command, e.g. "pkill"):
https://html.duckduckgo.com/html/?q=tldr+pkill

***ADD NETPBM IMAGE CONVERTER***

Netpbm's pnmscale and pnmtopng help with converting our phone camera images to rmkit's Harmony drawing app png layers.
Then you can draw with the photo as a background layer.
https://rmkit.dev/apps/harmony

You can also run the following script as a GUI app, using rmkit's Simple App Script interpreter:
https://www.mobileread.com/forums/sh...59&postcount=9

The netpbm package has the following dependencies:

Depends (6)
libjpeg-turbo**
libpng
libx11***
musl*
tiff***
zlib**

* Already got it from the Elinks/Nano install above (POST #3 - also got the /korenv.sh script.)
** Already have equivalents from base KOReader install.
*** Don't need tiff or libx11 for our commands

RUN THESE COMMANDS FROM LINUX DESKTOP:

$ cd myalpine/

DOWNLOAD THE REQUIRED PACKAGES:

$ wget https://dl-cdn.alpinelinux.org/alpin...0.73.41-r1.apk

$ wget https://dl-cdn.alpinelinux.org/alpin...-1.6.39-r0.apk

$ tar zxvf netpbm-10.73.41-r1.apk

$ mv usr/bin/pamscale scripts/pnmscale

$ mv usr/bin/pnmtopng scripts/

$ mv usr/lib/libnetpbm.so.11.73 libs/libnetpbm.so.11

$ tar zxvf libpng-1.6.39-r0.apk

$ mv usr/lib/libpng16.so.16.39.0 libs/

NOW CONNECT YOUR KOBO TO YOUR PC:

Copy the following binaries from the scripts/ folder on the PC to the /mnt/onboard/.adds/koreader/scripts/ folder on the kobo.
pnmscale
pnmtopng

***
* Backup your old libpng16.so.16 from the /mnt/onboard/.adds/koreader/libs/ folder on the kobo.
Then delete it from /mnt/onboard/.adds/koreader/libs/
***

Copy libs from the libs/ folder on the PC to the /mnt/onboard/.adds/koreader/libs/ folder on the kobo:
libnetpbm.so.11
libpng16.so.16.39.0

***
* Now doublecheck that KOReader can read png files with this new libpng16.so.16.39.0
***

Copy camera image s.jpg from your phone to the /mnt/onboard/.adds/rmkit/data/harmony/ folder on the kobo.

TRANSFORM PHOTO S.JPG FROM fbpadkb OR KOReader TERMINAL:

From kobo terminal(or SSH session):
# . /korenv.sh
# cd /mnt/onboard/.adds/rmkit/data/harmony

Convert image to grayscale, rotating if necessary:
# jpegtran -rotate 90 -grayscale s.jpg > s90.jpg

Convert jpg image to pnm:
# djpeg -pnm s90.jpg > sg.pnm

Scale image to your display(1088x1488 for Clara HD):
# pnmscale -width 1088 -height 1488 sg.pnm > bg.pnm

Convert pnm image to png:
# pnmtopng bg.pnm > bg.png

Note: you could have dimmed the image by using itself as an alpha mask:
# pnmtopng -alpha bg.pnm bg.pnm > bgs.png

Or for a less ghostly effect, use a 50% grayscale mask:
# pnmtopng -alpha a50.pgm bg.pnm > bga.png

Run harmony from rmkit, and import the bg.png as a layer.

Tip: You can wirelessly copy the photo from phone to Kobo, e.g. with KOReader's GUI ftp client:
https://www.mobileread.com/forums/sh...25&postcount=6

***

USING SCRIPT AND 50% ALPHA CHANNEL (REQUIRES ATTACHED a50.pgm FILE):

Create script jtop.sh (and jtopr.sh for when image needs to be rotated), to convert a jpg image to png while applying 50% alpha transparency.

$ nano jtop.sh

Code:

jpegtran -grayscale $1 | djpeg -pnm | pnmscale -width 1088 -height 1488 | pnmtopng -alpha a50.pgm > $2

Copy this script to /mnt/onboard/.adds/koreader/scripts/ on your kobo.
Unzip the attached a50.zip file and copy a50.pgm and your phone photo s.jpg to /mnt/onboard/.adds/rmkit/data/harmony.
Tip: you can use KOReader's GUI ftp client to download the photo from your phone to your kobo.
https://www.mobileread.com/forums/sh...25&postcount=6

Run the script with input parameters s.jpg (the photo image from your phone) and bg.png (the name you chose for the output png file).

# jtop.sh s.jpg bg.png

You can then input this png image as a layer to harmony.

Similarly for landscape photos that you need to rotate to portrait:

$ nano jtopr.sh

Code:

jpegtran -rotate 90 -grayscale $1 | djpeg -pnm | pnmscale -width 1088 -height 1488 | pnmtopng -alpha a50.pgm > $2

# jtopr.sh s.jpg bgr.png

* NOTE : you have to kill agetty again upon returning to Nickel after exiting KOReader.

***

*UPDATE: Add GIF support

From netpbm package above, add also:

$ mv usr/bin/pngtopnm scripts/

$ mv usr/bin/pamtogif scripts/

$ mv usr/bin/ppmtogif scripts/

$ mv usr/bin/giftopnm scripts/

Also add gifsicle package:

Gifsicle assembles gif images into gif animations.
http://www.lcdf.org/gifsicle/

The gifsicle package has the following dependencies:

Depends (2)
libx11**
musl*

* Already got it from the Elinks/Nano install above
** Don't need libx11 for our command

RUN THESE COMMANDS FROM LINUX DESKTOP:

$ cd myalpine/

DOWNLOAD THE REQUIRED PACKAGES:

$ wget https://dl-cdn.alpinelinux.org/alpin...le-1.93-r1.apk

$ tar zxvf gifsicle-1.93-r1.apk

$ mv usr/bin/gifsicle scripts/

NOW CONNECT YOUR KOBO TO YOUR PC:

Copy the following binaries from the scripts/ folder on the PC to the /mnt/onboard/.adds/koreader/scripts/ folder on the kobo.
pngtopnm
pamtogif
ppmtogif
giftopnm
gifsicle

FROM SSH SHELL OR ON KOBO:

# . /korenv.sh

# cd /mnt/onboard/.adds/rmkit/data/harmony

Convert png images to gif:

# pngtopnm lines.png | ppmtogif > 1.gif

# pngtopnm mtn.png | ppmtogif > 2.gif

Making a GIF animation with gifsicle:

# gifsicle --delay=123 --loop 1.gif 2.gif > anim.gif

# gifsicle -I anim.gif
* anim.gif 2 images
logical screen 1408x1920
global color table [2]
background 0
loop forever
+ image #0 1088x1448
delay 1.23s
+ image #1 1408x1920
delay 1.23s

View animated gif on desktop browser (or luakit browser if you had installed a graphical chroot on your Kobo) via html file:

# vi anim.html

Code:

<html>
<img SRC="anim.gif" ALT="anim">
</html>

# cp anim.* /mnt/onboard/shared/

# ls /mnt/onboard/shared/anim.*
/mnt/onboard/shared/anim.gif /mnt/onboard/shared/anim.html

View animated gif on Kobo via playgif.sh script (requires fbink binary and gifsicle from above):

# vi /mnt/onboard/.adds/kordir/scripts/playgif.sh

Code:

#!/bin/sh
# playgif.sh - play animated gifs using gifsicle and fbink

export LD_LIBRARY_PATH="/mnt/onboard/.adds/kordir/libs:$LD_LIBRARY_PATH"
nframes=`/mnt/onboard/.adds/kordir/scripts/gifsicle -I $1 | sed -n 's/ images//p' | sed 's/\* .*\.gif // '`
echo "nframes = $nframes"
nframes=$(expr "$nframes" - 1)
delays=`/mnt/onboard/.adds/kordir/scripts/gifsicle -I $1 | sed -n 's/.*delay //p' | sed  's/s//'`
for i in $(seq 0 1 "$nframes");do
 /mnt/onboard/.adds/kordir/scripts/gifsicle "$1" "#$i" > /tmp/tmp.gif;
 /mnt/onboard/.adds/kordir/scripts/fbink -G -g file=/tmp/tmp.gif;
 j=$(expr "$i" \+ 1)
 delayfraction=`echo "$delays" | sed -n "$j"' s/.*[0-9][0-9]*\.//p'`
 delaywhole=`echo "$delays" | sed -n "$j"' s/\.[0-9][0-9]//p'`
 delay=`echo $(expr "$delayfraction" \* 10000 \+ "$delaywhole" \* 1000000)`
echo "delay = $delay"
 usleep "$delay";
done

# playgif.sh anim.gif
nframes = 2
delay = 1230000
delay = 1230000

(can comment out : echo "delay = $delay")

***