Base/usr/share/man/man5/font.md
font - Bitmap Font File format (.font)
Font files contain bitmap definitions of fonts (Gfx::BitmapFont).
Bitmap fonts can be either varying-width or fixed-width.
The first four bytes of font files contain the filemagic: !Fnt (0x21466e74).
In addition, Gfx::BitmapFont supports reading from and writing to font files (as well as reading directly from memory).
The order is big-endian.
| Size | Member name |
|---|---|
| 4 bytes | Filemagic |
| 1 byte | Glyph width |
| 1 byte | Glyph height |
| 2 bytes | Range mask size |
| 1 byte | Variable width flag |
| 1 byte | Glyph spacing |
| 1 byte | Baseline |
| 1 byte | Mean line |
| 1 byte | Presentation size |
| 2 bytes | Weight |
| 1 byte | Slope |
| 32 bytes | Name |
| 32 bytes | Family |
Gfx::FontFileHeader in Userland/Libraries/LibGfx/Font/BitmapFont.cpp