function copy_result()

in js/qcms_utils.js [24:48]

• 22 lines of code
• 5 McCabe index (conditional complexity)

function copy_result(ptr, len) {
  // This function is called from the wasm module (it's an external
  // "C" function). Its goal is to copy the result from the wasm memory
  // to the destination buffer without any intermediate copies.
  const { _module, _mustAddAlpha, _destBuffer } = QCMS;
  const result = new Uint8Array(_module.memory.buffer, ptr, len);
  if (result.length === _destBuffer.length) {
    _destBuffer.set(result);
    return;
  }
  if (_mustAddAlpha) {
    for (let i = 0, j = 0, ii = result.length; i < ii; i += 3, j += 4) {
      _destBuffer[j] = result[i];
      _destBuffer[j + 1] = result[i + 1];
      _destBuffer[j + 2] = result[i + 2];
      _destBuffer[j + 3] = 255;
    }
  } else {
    for (let i = 0, j = 0, ii = result.length; i < ii; i += 3, j += 4) {
      _destBuffer[j] = result[i];
      _destBuffer[j + 1] = result[i + 1];
      _destBuffer[j + 2] = result[i + 2];
    }
  }
}