harfbuzzjs-example.js

// In a directory, run "npm install harfbuzzjs" to install harfbuzzjs
// then "node main.js" to run this example

var fs = require('fs');
var path = require('path');

function example(hb, fontBlob, text) {
  var blob = hb.createBlob(fontBlob);
  var face = hb.createFace(blob, 0);
  // console.log(face.getAxisInfos());
  var font = hb.createFont(face);
  // font.setVariations({ wdth: 200, wght: 700 });
  font.setScale(1000, 1000); // Optional, if not given will be in font upem

  var buffer = hb.createBuffer();
  buffer.addText(text || 'abc');
  buffer.guessSegmentProperties();
  // buffer.setDirection('ltr'); // optional as can be set by guessSegmentProperties also
  hb.shape(font, buffer); // features are not supported yet
  var result = buffer.json(font);

  // returns glyphs paths, totally optional
  var glyphs = {};
  result.forEach(function (x) {
    if (glyphs[x.g]) return;
    glyphs[x.g] = {
      name: font.glyphName(x.g),
      // path: font.glyphToPath(x.g),
      json: font.glyphToJson(x.g)
    };
  });

  var unicodes = face.collectUnicodes()

  buffer.destroy();
  font.destroy();
  face.destroy();
  blob.destroy();
  return { shape: result, glyphs: glyphs, unicodes: unicodes };
}

require('harfbuzzjs').then(function (hbjs) {
  console.log(example(hbjs, new Uint8Array(fs.readFileSync(path.resolve(__dirname, 'NotoSans-Regular.ttf')))));
}, console.log);