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Wiki > Main > CreateFonts > FontFormat

---++ 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 depth|2|monochrome (0) or anti-aliased (1)|
|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|

(to be written)

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

Parents: CreateFonts