private synchronized CloseableReference<Bitmap> detachBitmapReference() {
    CloseableReference<Bitmap> reference = mBitmapReference;
    mBitmapReference = null;
    mBitmap = null;
    return reference;
  }
Releases the bitmap to the pool.
imagepipeline-base/src/main/java/com/facebook/imagepipeline/image/BaseCloseableStaticBitmap.java