package_resources.py 文件源码

def _ConvertToWebP(webp_binary, png_files):
  pool = multiprocessing.pool.ThreadPool(10)
  def convert_image(png_path):
    root = os.path.splitext(png_path)[0]
    webp_path = root + '.webp'
    args = [webp_binary, png_path] + _PNG_TO_WEBP_ARGS + [webp_path]
    subprocess.check_call(args)
    os.remove(png_path)
  # Android requires pngs for 9-patch images.
  pool.map(convert_image, [f for f in png_files if not f.endswith('.9.png')])
  pool.close()
  pool.join()