private ImageDecoder createRegionDecoder() {
    return new FrescoVitoRegionDecoder(Fresco.getImagePipelineFactory().getPlatformDecoder());
  }
Simple experimental Fresco Vito fragment that just displays an image.
samples/showcase/src/main/java/com/facebook/fresco/samples/showcase/vito/FrescoVitoLithoRegionDecodeFragment.java