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otf2svg

v1.0.2

Published

Convert Open Type (OTF) font files to SVG font files

Downloads

4,604

Readme

otf2svg

NPM version Build Status

This is a small utility that uses the fontkit module to convert Open Type (OTF) font files to SVG font files.

While the SVG font format is deprecated, there is currently (as of September 2020) no consistently working native javascript solution for converting Open Type fonts to any other format. Fontkit and opentype.js can parse Open Type fonts reasonably well, but cannot do any sort of conversion. The fonteditor-core package has code for opentype conversion but this has many known issues and can mangle glyphs on e.g. Google's Noto CJK fonts.

This tool provides a way around this problem by allowing accurate conversion into the SVG font format, which can then be converted into any other desired format by, e.g. fonteditor-core.

Unfortunately, SVG fonts are more limited than other formats and therefore considered deprecated. If/when fontkit or opentype.js implements direct opentype to truetype conversion or fonteditor-core fixes their opentype code this package should be deprecated in favor of a different solution.

Features

  • Converts OTF font files to SVG font files
  • Can be imported as a module or run as a command line tool
  • Works with Google's Noto CJK fonts

Usage

To use as a module:


const otf2svg = require('otf2svg');

let rawSVGString = otf2svg.convert("/path/to/input.otf");

let createdSVGFilePath = otf2svg.convertToFile("/path/to/input.otf", "/path/to/desired/output.svg");

let unicodePointsToInclude = [ 0x5b99 ];
let createdSvgSubsetFilePath = otf2svg.convertToFile("/path/to/input.otf", 
                                                     "/path/to/desired/output-subset.svg", 
                                                     unicodePointsToInclude);

To use as CLI:

otf2svg /path/to/input.otf /path/to/output.svg

The command line tool cannot do subsetting at this time (you will have to use as a module for this).

API

otf2svg.convert(inputOTF, subsetUnicodePointArray = null)

Converts an OTF font file to an SVG file, returning a string representation of the raw SVG file. All I/O is performed synchronously.

inputOTF: If this is a string, it is interpretted as a file to open and read. If this is a Buffer, it is interpretted as binary OTF data.

subsetUnicodePointArray: If this is null, the entire file is converted, which is the default. Otherwise it should be an integer array containing unicode code points to preserve.

otf2svg.convertToFile(inputOTF, outputSVG = null, subsetUnicodePointArray = null)

Converts an OTF font file to an SVG file, returning the path of the SVG file written. All I/O is performed synchronously.

inputOTF: If this is a string, it is interpretted as a file to open and read. If this is a Buffer, it is interpretted as binary OTF data.

outputOTF: The path of the output file to write the SVG file to. If this is null, the path will be the same as the input file with the extension switched to ".svg". If the input is a buffer and the parameter is null the output path will be "output.svg"

subsetUnicodePointArray: If this is null, the entire file is converted, which is the default. Otherwise it should be an integer array containing unicode code points to preserve.

License

ISC