6x12 pixel font. Go to /src to see source image.
The image files get included in the compiled binary. Simply running the code should output the file at /target/io.abf.
Files should be named src_U+X where X is the starting codepoint of the glyph. The glyph data is assumed to be contiguious.
Any glyph with a color other than black / white is assumed to be a skipped glyph.
These colors are used as a convention:
| color | meaning |
|---|---|
| red | empty codepoint |
| green | unrepresentable |
| blue | to do |
To add a file, first add the file itself, then modify the source code at /src/main.rs:
const FILES: &[FontImage] = &files!["00"];to contain the exact string of the codepoint part of the file name.
For example, if you've added src_U+030.png and src_U+40.png, you would modify it to be like this:
const FILES: &[FontImage] = &files!["00", "030", "40"];and not this:
const FILES: &[FontImage] = &files!["00", "30", "40"];or this:
const FILES: &[FontImage] = &files!["00", "U+0030", "U+0040"];Since the string is used for both finding the codepoint AND the source image.
In general, stick to 2, 4, and 6 letters long representation of codepoints.
The binary format is divided into 16 byte chunks. A chunk represents a glyph except for the first chunk which contains the name of the font.
| 0 | 1..14 | 15 |
|---|---|---|
| format byte (0) | name (ascii, null terminated) | (empty) |
| 0..3 | 4.. |
|---|---|
| codepoint | rows |
where a byte represents a row. (The least significant bit corresponds to the left most pixel.)