FNT Font File Format
FNT is a simple binary font format used by Rockbox. It is a fixed-size raster font format that supports unicode. (In this context a 'long' is intended to mean a 32 bit unit regardless of target architecture)Header
The FNT header is exactly 36 bytes long consisting of the following fields:| Field | Length (bytes) | Description |
|---|---|---|
| UCHAR version[4] | 4 | magic number and version bytes (currently 'RB12') |
| USHORT maxwidth | 2 | font max width in pixels |
| USHORT height | 2 | font height in pixels |
| USHORT ascent | 2 | font ascent (baseline) in pixels |
| USHORT pad | 2 | unused, pad to 32-bit boundary |
| ULONG firstchar | 4 | first character code in font |
| ULONG defaultchar | 4 | default character code in font |
| ULONG size | 4 | # characters in font |
| ULONG nbits | 4 | # bytes imagebits data in file |
| ULONG noffset | 4 | # longs offset data in file |
| ULONG nwidth | 4 | # bytes width data in file |
Glyphs
| Field | Length (bytes) | Description |
|---|---|---|
| MWIMAGEBITS bits | nbits | image bits variable data |
| [MWIMAGEBITS padded to 16-bit boundary] | ||
| USHORT offset | noffset*2 | offset variable data |
| UCHAR width | nwidth*1 | width variable data |
r2 - 03 Mar 2006 - 05:55:02 - BernardKethlayne
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