The AAF Font File Format is used to store fonts in Fallouts 1 & 2. Only the AAF files used in the English versions are discussed here, there may or may not be variations for other languages.
The AAF file stores a separate glyph for each of the 256 position in the ASCII table. The fonts in an AAF file are typically non-fixed size, i.e. each glyph has it's own width and height. A glyph is defined by a rectangular bitmap representing the pixels of the glyph, corresponding to the way that it appears on the screen. Each pixel can have a possible value in the range of 0 to 9.
Here is an example of the bitmap of a glyph. This glyph is from the file FONT1.AAF and represents the character 'b' (ASCII 98).
77 77 777763 77 76 77 77 77 76 777763
Pixels with value 0 are not shown as they are transparent. The higher numbers 7 and 6 represent the brighter parts of the glyph, while the 3 would be much duller in colour. This would be expected for the rounder corners of the b.
| Offset | Bytes | Data Type | Description |
|---|---|---|---|
| 0x000 | 4 | char[4] = "AAFF" | Signature used to identify file type. |
| 0x004 | 2 | unsigned short | Maximum glyph Height.This is the maximum height of the glyph, including ascenders and descenders. |
| 0x006 | 2 | unsigned short | Horizontal gap.Gap size (in pixels) between adjacent glyphs. |
| 0x008 | 2 | unsigned short | Width of space.The width of the space character. |
| 0x00A | 2 | unsigned short | Vertical gap.The number of pixels between two lines of glyphs. |
| 0x00C | 2 | unsigned short | GLYPH-0-WIDTH : Width of glyph 0.The width (in pixels) of the glyph corresponding to ascii 0. |
| 0x00E | 2 | unsigned short | GLYPH-0-HEIGHT : Height of glyph 0.The height (in pixels) of the glyph corresponding to ascii 0. |
| 0x010 | 4 | unsigned long | Offset of glyph 0.The offset in this AAF file where the data for glyph 0 is stored.You need add 0x080C to this value to getting REAL offset from begin of file. Note: If GLYPH-x-WIDTH * GLYPH-x-HEIGHT = 0 (NULL glyph), then this value is offset of next "REAL" glyph. |
| 0x014 | 2 | unsigned short | GLYPH-1-WIDTH : Width of glyph 1. |
| 0x016 | 2 | unsigned short | GLYPH-1-HEIGHT : Height of glyph 1. |
| 0x018 | 4 | unsigned long | Offset of glyph 1. You need add 0x080C to this value to getting REAL offset from begin of file. |
| 0x01C | (2 + 2 + 2) * (256 - 2) | Descriptions of glyphs 2 through 255, as described above. | |
| 0x80C | GLYPH-0-WIDTH * GLYPH-0-HEIGHT | byte = [0..9] | Pixel data for glyph 0. Contains the pixel data for the glyph. Each pixel in the glyph is represented by one byte, with possible values in the range 0 to 9. A value of 0 means the pixel is transparent, while values 1 to 9 represent different brightness values of the pixel (1 is dark and 9 is bright). Pixel data is starts at the top left corner of the glyph and increases left to right, then top to bottom. |
| 0x080C + (GLYPH-0-WIDTH * GLYPH-0-HEIGHT) | GLYPH-1-WIDTH * GLYPH-1-HEIGHT | byte = [0..9] | Pixel data for glyph 1. |
| 0x080C + (GLYPH-0-WIDTH * GLYPH-0-HEIGHT) + (GLYPH-1-WIDTH * GLYPH-1-HEIGHT) | ... | byte = [0..9] | Pixel data for glyphs 2 to 255, as described above. |
Note: All integers are in Motorola / big-endian format.
2019-12-16 - Ported from https://falloutmods.fandom.com/wiki/AAF_File_Format by ghost
Patched by Anchorite (anchorite2001@yandex.ru)
Created by Noid (noid@888.nu)