BMF – ByteMap font format
Version 1.1
| offset |
size |
meaning |
| 0 | 4 | magic header (its hexa dump is: E1 E6 D5 1A) |
| 4 | 1 | version (0x11 for v1.1) |
| 5 | 1 | line-height |
| 6 | 1 | size-over the base line (–128…127) |
| 7 | 1 | size-under the base line (–128…127) |
| 8 | 1 | add-space after each char (–128…127) |
| 9 | 1 | size-inner (small letters height) (–128…127) |
| 10 | 1 | count of used colors |
| 11 | 1 | highest used color attribute |
| 12 | 4 | reserved |
| 16 | 1 | number of colors in palette (P) |
| 17 | P*3 | font palette (RGB, 0…63 per component) |
| 17+P*3 | 1 | title length (T) |
| 18+P*3 | T | title string |
| 19+P*3+T | 2 | number of characters in font (N) |
| 20+P*3+T | ? | list of bitmap character definitions [which char, entry, bitmap] |
N * …
| offset | size | meaning |
|---|
| 0 | 1 | which character |
| 1 | 1 | character width (W) |
| 2 | 1 | character height (H) |
| 3 | 1 | relx – horizontal offset according to cursor (–128…127) |
| 4 | 1 | rely – vertical offset according to cursor (–128…127) |
| 5 | 1 | horizontal cursor shift after drawing the character |
| 6 | W * H | character bitmap (uncompressed, 8 bits per pixel) |
Example
| | F | j | : | Q |
| relx | 0 | –2 | 1 | 0 |
| rely | 0 | 2 | 2 | 0 |
| W | 4 | 4 | 1 | 10 |
| H | 8 | 9 | 4 | 9 |
| shift | 4 | 2 | 3 | 8 |
addspace=1. The red arrow is cursor position during outputing each character in the text.
