lv_font_conv is a Node.js-based command-line tool (with a web interface) that converts vector fonts (TTF, OTF, etc.) into bitmap fonts optimized for embedded systems, particularly the LVGL graphics library. It processes font files using opentype.js and an Emscripten-compiled FreeType WebAssembly module to extract glyph metrics and rasterize bitmaps. The tool supports subsetting, merging multiple fonts, kerning preservation, and configurable output formats (raw binary, LVGL-specific C arrays, and debug dumps) with adjustable bits-per-pixel (1-4) and optional RLE/XOR compression. The architecture follows a modular pipeline: argument parsing delegates to font data collection, which feeds into conversion logic that builds font tables (head, cmap, glyf, loca, kern) before format-specific writers produce the final output. Key entry points are the CLI script (lv_font_conv.js) and the web interface (web/index.html via parcel/bundler).
fontbm is a cross-platform command-line tool for generating BMFont-compatible bitmap fonts from TrueType/OpenType fonts using FreeType2. The application parses command-line options, renders glyphs, packs them into texture atlases using MaxRectsBinPack, and outputs font metrics in multiple formats (text, XML, binary, JSON) along with PNG texture pages. The architecture is modular with clear separation of concerns: option parsing, FreeType handling, glyph packing, rendering, and output formatting. While the core logic is specific to font bitmap generation, several utility components demonstrate reusable patterns.