Theme system

MonsterMesh ships a device-wide theme system with seven palettes, selectable from the Meshtastic Settings → Theme dropdown. Themes recolor the entire device-ui (boot screen, node list, terminal, dropdowns) — not just the emulator.

The seven themes

Theme	Look
Dark	Stock dark UI
Light	Stock light UI
DMG	Original Game Boy LCD green (classic four-shade #0F380F → #9BBC0F)
GBC	Game Boy Color dark-teal palette
Pocket	High-contrast green (the default Game Boy Pocket look)
Poke Blue	Generation-1 “Blue” palette
Poke Red	Generation-1 “Red” palette

The three “green” themes (DMG, GBC, Pocket) switch the whole UI over to crisp Cozette bitmap fonts with tuned line spacing, for an authentic handheld feel; Dark/Light use the stock fonts.

How it works

Theming lives in the device-ui patches under patches/device-ui/ (these are full-file copies that get dropped into the meshtastic-device-ui library during the build — see BUILD.md):

• Themes.{h,cpp} — the theme enum plus a color table (themeColor[COLOR][theme]) and getter helpers (darkest(), dark(), mid(), accent(), light(), lightest()). Themes::set() re-applies every LVGL style, re-themes the live MonsterMesh terminal panel, and walks existing labels to recolor them. An isGreen() helper drives the Cozette-font / line-spacing path.
• screens.c — the LVGL screen definitions (boot screen, the MonsterMesh terminal, the theme dropdown). The boot screen is hard-coded to the Pocket palette because it draws before the theme system has loaded.
• lv_font_cozette_13.c, lv_font_cozette_20.c, lv_font_cozette_26.c — the Cozette bitmap fonts at three sizes.
• lv_i18n.c — localized strings, including the theme dropdown labels (Dark / Light / DMG / GBC / Pocket / Poke Blue / Poke Red).

In the MonsterMesh module itself, the ROM browser asks for the active palette (getBrowserPalette()) and rebuilds its screen when the theme changes, so the file picker matches your chosen look.

Fonts & credit

• Cozette — © Slavfox, MIT. https://github.com/slavfox/Cozette — the bitmap font the green themes switch the UI to.

See CREDITS.md.

Adding or editing a theme

1. Add the column to the themeColor[][] table in patches/device-ui/Themes.cpp (and the enum in Themes.h).
2. If it’s a green/handheld palette, make isGreen() return true for it so it gets the Cozette font.
3. Add its label to the dropdown strings in lv_i18n.c.
4. Rebuild and re-copy the patched device-ui files (see BUILD.md).