BMF – ByteMap font format
| offset | size | meaning |
|---|---|---|
| 0 | 4 | magic header (its hexa dump is: E1 E6 D5 1A) |
| 4 | 1 | version (currently 11h) |
| 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 (non-caps level) (-128…127) |
| 10 | 1 | count of used colors (usually <= 32) |
| 11 | 1 | highest used color attribute |
| 12 | 4 | reserved |
| 16 | 1 | number of RGB entries (P) |
| 17 | P*3 | font palette (RGB bytes, max=63) |
| 17+P*3 | 1 | info length (L) |
| 18+P*3 | L | info string |
| 19+P*3+L | 2 | number of characters in font |
| 20+P*3+L | ? | list of bitmap character definitions [which char, entry, data] |
| offset | size | meaning |
|---|---|---|
| –1 | 1 | which character |
| 0 | 1 | character width (W) |
| 1 | 1 | character height (H) |
| 2 | 1 | relx horizontal offset according to cursor (-128…127) |
| 3 | 1 | rely vertical offset according to cursor (-128…127) |
| 4 | 1 | horizontal cursor shift after drawing the character |
| 5 | W * H | character data itself (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.