Thanks for sharing that, I'll have a read. Knowing very little on the subject, I was missing the keywords to duck-duck-go for to find any info on the topic of generating font sprites for embedded systems.
Thanks! That's right, and I haven't even thought about it at all. So cool :)
It's a hobby/educational project, but I'm happy to see it solving some people's problems. I once wanted to add a good-looking font to my e-paper display for the air quality monitor project and I stumbled upon a simple MacOS app that converted images with text to byte arrays (https://luckyresistor.me/font-to-byte/). I picked it up, updated to Swift 3 and adjusted to my needs. When I blogged about it, somebody complained that it's MacOS only, so I decided to rewrite it in C++ with Qt (learning some modern C++ on that occasion).
The app was still quite cumbersome as it required you to prepare input images in external software like GIMP or Ps, and people had a hard time understanding the process. I was being asked repeatedly to help generate an image for a given font, so I figured out that the app could (should) be generating those input images programmatically. From there I added a minimal graphical editor to allow making corrections to auto-generated bitmaps (or drawing ones from scratch) and here we are.
Last but not least, I had a great fun learning C++17 and writing a template-based source code generator.