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## Summary **What is the goal of this PR?** Improved typesetting, including [kerning](https://en.wikipedia.org/wiki/Kerning) and [ligatures](https://en.wikipedia.org/wiki/Ligature_(writing)#Latin_alphabet). **What changes are included?** - The script to convert built-in fonts now adds kerning and ligature information to the generated font headers. - Epub page layout calculates proper kerning spaces and makes ligature substitutions according to the selected font.    ## Additional Context - I am not a typography expert. - The implementation has been reworked from the earlier version, so it is no longer necessary to omit Open Dyslexic, and kerning data now covers all fonts, styles, and codepoints for which we include bitmap data. - Claude Opus 4.6 helped with a lot of this. - There's an included test epub document with lots of kerning and ligature examples, shown in the photos. **_After some time to mature, I think this change is in decent shape to merge and get people testing._** After opening this PR I came across #660, which overlaps in adding ligature support. --- ### AI Usage While CrossPoint doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it helps set the right context for reviewers. Did you use AI tools to help write this code? _**YES, Claude Opus 4.6**_ --------- Co-authored-by: Cursor <cursoragent@cursor.com>
This directory is intended for PlatformIO Test Runner and project tests. Unit Testing is a software testing method by which individual units of source code, sets of one or more MCU program modules together with associated control data, usage procedures, and operating procedures, are tested to determine whether they are fit for use. Unit testing finds problems early in the development cycle. More information about PlatformIO Unit Testing: - https://docs.platformio.org/en/latest/advanced/unit-testing/index.html