前端性能优化思想模型，在自动驾驶领域的实践（下）

const transformToBinaryPcd = (points) => {
  // XYZI模式，共4个参数，每个参数4个字节
  const dataview = new DataView(new ArrayBuffer(16 * points.length));
  points.forEach((point, rowIndex) => {
    if (point.length) {
      point.forEach((axis, axisIndex) => {
      dataview.setFloat32(rowIndex * 16 + axisIndex * 4, Number(axis), true)
      })
    }
  })
  return dataview;
}
const run = (input, output) => new Promise((resolve) => {
  const data = fs.readFileSync(input)
  const ab = data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength);
  const result = parse(ab);
  const finalPoints = trans(result.points)
  const dataview = transformToBinaryPcd(finalPoints);
  const wstream = fs.createWriteStream(output, 'binary');
  wstream.write(getPCDHeaderString(finalPoints.length))
  wstream.write(Buffer.from(dataview.buffer))
  wstream.end(() => {
    resolve(`${output} 写入成功！`);
  });
})