glcdfont converter to and from PBM

QMK-based keyboards support OLED displays and use a bitmap font encoded in glcdfont format. This tool decodes the font to PBM and back into char array for use in glcdfont.c. PBM is a plain-text monochrome image format supported by Gimp.

Usage

Setup

Make sure you have a working Elixir 1.8+ interpreter installed. Consult your package manager.

Macos: brew install elixir

Easiest way:

• install the asdf tool
• asdf plugin-add elixir
• asdf plugin-add erlang
• asdf install

Decode

Convert a glcdfont.c file

cat glcdfont.c | ./decode.exs > glcdfont.pbm

The PBM file can be edited with Gimp. When you export it back into PBM, make sure to pick the ASCII mode.

Encode

cat glcdfont.pbm | ./encode.exs

Paste output in the array in the glcdfont.c file. Done!