Converting fonts for lvgl

convert_fonts_for_lvgl.md

OTF fonts

OTFs have to be converted to TTF first.

see: https://convertio.co/otf-ttf/

TTF fonts

Use the official web-based converter: https://lvgl.io/tools/fontconverter

• Bpp:

  • 1bpp: Takes up the least amount of space but has no antialiasing and will not look good in most cases.
  • 2bpp: Noticeable improvement but flaws are still visible (esp in SeedSigner button text).
  • 3bpp: Did not try
  • 4bpp: Strikes the right mix between size vs rendering quality.

• Output format:

  • C file: for main / system fonts that will be compiled into the firmware.
  • Binary: For additional fonts (e.g. l10n) that may or may not be included at runtime.

• Additional options checkboxes:

  • None selected.

• Range:

  • Basic ASCII: 0x20-0x7f
  • SeedSigner icons: 0xe900-0xe923