6x12 pixel font. Go to /src to see source image.

Compiling

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.

Binary format

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.

Name format

0	1..14	15
format byte (0)	name (ascii, null terminated)	(empty)

Glyph format

0..3	4..
codepoint	rows

where a byte represents a row. (The least significant bit corresponds to the left most pixel.)