Each font is based upon a single font texture, and a list of offsets into that texture at which the various characters may be found. A font texture is an alpha channel only. Every font is declared with a font start chunk :

[standard chunk header - type is 0x0300]

Offset	Length	Description
0	4	Font id.
4	2	font texture width
6	2	font texture height
8	(width * height)	font texture. Stored as one byte per pixel, which is the alpha component at that position.

There then follows a list of character declarations which express which characters are present on the font bitmap and where they are. Character declarations refer to the last declared font. The form is :

[standard chunk header - type is 0x0301]

Offset	Length	Description
0	2	Character range start.
2	4	Character range end.
6	(1 + range start - range end)*8	Character position information. Contains the following info (measured in pixels) : 2 bytes - start x position for this character 2 bytes - start y position for this character 2 bytes - width of this character 2 bytes - height of this character The first one of these records relates to the character 'character range start', the next to 'character range start+1', and so on. Characters 0x20-0x7f (inclusive) are considered to be the ASCII standards. Beyond this I have not yet decided.

NB due to a typo in my font creation program, the most recent set of release data files has these chunks as 0x0200 & 0x0201, clashing with object declarations. This is a short term error!