nodemcu-firmware/app/u8glib/README.md

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##U8glib package
Ported from https://github.com/olikraus/u8glib
Here is black magic with ImageMagic package for image conversion:
```bash
#!/bin/bash
mkdir out
for icon in *png; do
convert $icon -depth 1 ./out/$(basename $icon .png)_1bpp.png
if [[ "$icon" == *"black"* ]]; then
convert ./out/$(basename $icon .png)_1bpp.png -background white -alpha Background ./out/$(basename $icon .png)_1bpp.xbm
else
convert ./out/$(basename $icon .png)_1bpp.png -background black -alpha Background ./out/$(basename $icon .png)_1bpp.xbm
fi
cat ./out/$(basename $icon .png)_1bpp.xbm | tr '\n' ' ' | tr -d " " |sed -e s'#^.*{##g' | sed s'#,}##' |sed s'/;//' | xxd -r -p > ./out/$(basename $icon .png).xbm.mono
done
rm out/*png out/*xbm
```
Convert all the png in the current folder and put resulting .mono to ./out
The convert binary is a part of ImageMagic package. You need to install it.
```
sudo apt-get install imagemagick
```
for Debian/Ubuntu.