docs: private synchronized Producer<CloseableReference<CloseableImage>> getPostprocessorSequence(
        Producer<CloseableReference<CloseableImage>> inputProducer) {
      if (!mPostprocessorSequences.containsKey(inputProducer)) {
        PostprocessorProducer postprocessorProducer =
            mProducerFactory.newPostprocessorProducer(inputProducer);
        PostprocessedBitmapMemoryCacheProducer postprocessedBitmapMemoryCacheProducer =
            mProducerFactory.newPostprocessorBitmapMemoryCacheProducer(postprocessorProducer);
        mPostprocessorSequences.put(inputProducer, postprocessedBitmapMemoryCacheProducer);
      }
      return mPostprocessorSequences.get(inputProducer);
    }