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Wiki > Main > FontFormat (compare)

Difference: FontFormat (r2 vs. r1)

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 (In this context a 'long' is intended to mean a 32 bit unit regardless of target architecture. architecture)

Header

The FNT header is exactly 36 bytes long consisting of the following fields:

Fieldlength Length (bytes) description 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

Gyphs Glyphs

FieldLength (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

(to be written)

r3 - 05 Mar 2011 - 18:38:23 - ThomasMartitz

Revision r2 - 03 Mar 2006 - 04:55 - BernardKethlayne
Revision r1 - 03 Mar 2006 - 04:01 - BernardKethlayne
Copyright by the contributing authors.