The .hex Font Format
The GNU Unifont .hex format defines its glyphs as either 8 or 16 pixels in width by 16 pixels in height. Most Western script glyphs can be defined as 8 pixels wide, while other glyphs (notably the Chinese-Japanese-Korean, or CJK set) are typically defined as 16 pixels wide.
The unifont.hex file contains one line for each glyph. Each line consists of a four digit Unicode hexadecimal code point, a colon, and the bitmap string. The bit string is 32 hexadecimal digits for an 8 pixel wide glyph or 64 hexadecimal digits for a 16 pixel wide glyph.
A '1' bit in the bit string corresponds to an 'on' pixel. Pixels bits are stored top to bottom, left to right.
The font is then converted into a BDF file for use on X11.
Read more about this topic: GNU Unifont
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