Function getCachedMatrix

components/QRCode.tsx:64–79

(value: string, ecl: ErrorCorrectionLevel)

const matrixCache = new Map<string, boolean[][]>();

const getCachedMatrix = (value: string, ecl: ErrorCorrectionLevel): boolean[][] => {
  const key = `${ecl}|${value}`;
  const hit = matrixCache.get(key);
  if (hit) {
    matrixCache.delete(key);
    matrixCache.set(key, hit);
    return hit;
  }
  const m = encodeQR(value, 'raw', { ecc: eclMap[ecl], border: 0 });
  matrixCache.set(key, m);
  if (matrixCache.size > MATRIX_CACHE_MAX) {
    const first = matrixCache.keys().next().value;
    if (first !== undefined) matrixCache.delete(first);
  }
  return m;
};

type RenderPlan = {
  N: number;