export-kerning/convertOptimizedKerning.js

Export kernings of a Opentype font

// Utility to convert SVG-style optimized kerning format back to simple kerning pairs
// Input: { unitsPerEm, kerningPairs: [ { left: [...], right: [...], value: ... }, ... ] }
// Output: { unitsPerEm, kerningPairs: { 'AV': -80, ... } }

function convertOptimizedToSimple(optimizedData) {
  const result = {};
  for (const group of optimizedData.kerningPairs) {
    for (const left of group.left) {
      for (const right of group.right) {
        result[left + right] = group.value;
      }
    }
  }
  return {
    unitsPerEm: optimizedData.unitsPerEm,
    kerningPairs: result
  };
}

module.exports = { convertOptimizedToSimple };