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robhagemans/monobit: Tools for working with monochrome bitmap fonts

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The monobit tools let you modify bitmap fonts and convert between several formats.

monobit's native format is yaff, a human-friendly, text-based visual format similar to the ones used by Roman Czyborra's hexdraw, Simon Tatham's mkwinfont and John Elliott's psftools. Details are given in the yaff font file format specification.

Monobit requires Python 3.9 or above. Install through pip install monobit. Some formats or features require additional packages; see Dependencies below for a list. These will be installed automatically if you use pip.

monobit can be used as a Python package or as a command-line tool.

Here are some examples of how to use the conversion utility.

monobit-convert --help

Display usage summary and command-line options

monobit-convert --help load --format=raw

Display usage summary and additional format-specific command-line options for conversion from raw binary.

monobit-convert fixedsys.fon

Recognise the source file format from "magic bytes" or suffix (here, a Windows font) and write fonts to standard output in yaff format.

monobit-convert roman.bdf to --format=unifont

Read font from BDF file and write to standard output as Unifont HEX.

monobit-convert fixed.psf to fixed.png

Read font in PSF format and write to disk as image in PNG format.

monobit-convert --format=c to --format=bdf

Read font from standard input as C-source coded binary and write to standard output as BDF.

The converter transparently reads and writes gz, bz2, or xz-compressed font files and can read and write zip and tar archives. Some font formats contain multiple fonts whereas others can contain only one; the converter will write multiple files to a directory or archive if needed.

It is also possible to apply various transformations on the font before saving it. Check monobit-convert --help for usage.

The banner utility renders text to standard output in a given font. This is similar to the ancient banner commands included in System-V and BSD Unixes.

For example, the banner at the top of this README was made with

me@bandit:~$ monobit-banner '| monobit. |' --font=VGASYS.FON

monobit-banner has a number of rendering options - you can choose fonts, change the "ink" and "paper" characters, set a margin, scale text, and rotate by quarter turns. Check monobit-banner --help for usage.

[P] requires PIL
[F] requires fontTools

(1) 16-bit Windows NE container with FNT resource only
(2) Bitmap only (OTB)
(3) Limited read functionality: no support for ASCII-art, which is a core feature of Figlet

M multiple-font container
U Unicode
US Unicode, multi-codepoint sequences
SB Single-byte character sets
MB Multi-byte character sets
O Overlapping glyphs K Kerning
V Vertical metrics
G Greyscale fonts
C Colour fonts (not supported by monobit)

If the abbreviation is bracketed, the format supports this but it is not implemented.

MC multi-cell glyphs

These formats output a table of glyphs. PDF, text and block charts are write-only, image charts can be read through the image reader.

[P] requires PIL
[R] requires reportlab

Greyscale and colour support is experimental. An extension of the YAFF format allows storing glyphs with up to 8 bits per pixel (256 colours or grey levels).

Stroke font support is experimental. Stroke fonts are scalable fonts defined as line segments. They are fundamentally different from modern fonts in that they define single strokes whereas modern fonts define outlines to be filled with ink. Additionally, the fonts currently supported consist of straight line segments only.

monobit will recurse and extract font files from a number of common container, archive, compression and encoding formats:

[A] requires libarchive
[C] requires acefile
[Y] requires python3-yenc
[Z] requires ncompress

Note that many of these currently require reading the full archive into memory, which may not be practicable with e.g ISO9660 or WARC files which can hold whole filesystems.

This is the most common format used on old platforms, often with the unhelpful suffix .fnt. As there is no metadata, it's up to you to specify the character-cell size. The most common, and default, size is 8x8 (CGA and many 8-bit platforms), followed by 8x16 (VGA) and 8x14 (EGA).

• 8x8 raw files are also known as .f08, .ch8, .88, .chr, .udg, and many others.
• 8x14 raw files are also known as .f14 or .814.
• 8x16 raw files are also known as .f16, Warp 9 .fnt or Degas Elite .fnt
• Genecar .car files are 16x16 raw files.
• Harlekin III .fnt files are raw binaries with a 4096x8 pixel bitmap strike hosting 512 8x8 glyphs side by side. Extract with -strike-width=512.

It is also useful to check the file size. Raw files commonly hold 96 (ASCII excluding controls), 128 (ASCII), 256, or multiples thereof. Common file sizes therefore are:

If your unidentified font file has one of these sizes, chances are it is a raw binary file.

monobit can extract bitmaps embedded in TrueType and OpenType font files. It should be kept in mind that these are primarily intended as scalable formats, and only exceptionally embed bitmaps to improve rendering on low-resolution displays.

The vast majority of .ttf, .otf, .dfont etc. files do not contain bitmaps at all. This is true even for fonts with a pixelised look. To convert these you first need to rasterise them, which monobit does not do. Some of the other font tools linked below do have rasterising features.

monobit can experimentally output OpenType Bitmap (.otb) files, a bitmap-only file format supported by Linux desktops.

Some formats require

• PIL (Pillow)
• reportlab
• fontTools
• libarchive
• python3-yenc
• ncompress
• acefile

The renderer additionally employs

• uniseg
• python-bidi
• arabic-reshaper

Almost all can be installed through Pip:

pip install Pillow reportlab fonttools uniseg python-bidi arabic-reshaper libarchive-c ncompress acefile

The package python3-yenc is available at https://github.com/oe-mirrors/python3-yenc and through some Linux distributions. Without these packages, some functionality may not be available.

monobit and the yaff specification are copyright 2019--2024 Rob Hagemans and released under the MIT licence.

monobit contains code from:

• mkwinfont copyright 2001 Simon Tatham. All rights reserved.
• dewinfont copyright 2001,2017 Simon Tatham. All rights reserved.
• OS/2 GPI Font Tools (C) 2012 Alexander Taylor
• FONDU copyright (C) 2000,2001,2002,2003 by George Williams

Please refer to the notices in the windows and os2 subpackages and mac/fond.py module for licences and more information.

The font files in tests/fonts are subject to their own licences, some of which are more restrictive. These are files used for testing and development and are not included in the packaged distribution. See tests/fonts/README.md and notices included with individual files.

monobit would not exist without those documenting, reverse-engineering, implementing and preserving font formats and files:

• The Internet Archive
• Archive Team
• Jason Scott's textfiles.com
• John Elliott's homepage
• Simon Tatham's fonts page
• Aivosto's character set documentation
• Rebecca Bettencourt's character set documentation
• Xiphoseer's Signum Document Toolbox
• George Williams et al.'s FontForge documentation
• FreeType Glyph Conventions
• ... and many others

Other bitmap font tools you could use in conjunction with (or instead of) monobit include:

• FontForge
• Rebecca Bettencourt's Bits'n'Picas
• John Elliott's PSFTools
• Mark Leisher's gbdfed
• RECOIL
• John Zaitseff's console font utilities
• George Williams's Fondu
• VileR's Fontraption

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