sverrejb/slint-kindle-backend

This is a Rust library that lets developers run graphical apps on jailbroken Kindle e-readers. Kindle devices were designed for reading books, not running custom software, but people who have modified (jailbroken) their Kindles can use this library to display interactive screens built with Slint, a graphical interface toolkit written in Rust. The project acts as a connector between Slint and the Kindle's hardware. Slint is a toolkit for building user interfaces that normally targets desktop operating systems or embedded devices with standard display setups. This library provides the missing piece that tells Slint how to draw pixels on a Kindle screen specifically, which lacks the font and display infrastructure that most operating systems provide out of the box. Because Kindles do not ship with any system fonts, every application built with this library must bundle its own font file. The setup is straightforward: a developer adds the library as a dependency, points the startup code at a font file included in the app's binary, and from there Slint widgets render normally on the Kindle screen. Additional fonts can be registered after the initial setup if an application needs more than one typeface. Compiling the code for a Kindle requires a special build step because Kindles run on an older ARM processor architecture with a minimal system layer called musl. The README documents the exact toolchain commands needed to produce a binary that runs on the device. The library has been tested on two Kindle models: a 7th-generation Paperwhite and a 4th-generation Touch. The author marks it as experimental and notes that other Kindle models have not been tested. The roadmap lists example apps, broader device support, and automatic font detection as future goals. The code is available under MIT or Apache 2.0 licenses, though applications built with it must also comply with Slint's own licensing terms.