public void parseMetaData() {
    if (!sUseCachedMetadata) {
      internalParseMetaData();
      return;
    }

    if (mHasParsedMetadata) {
      return;
    }
    internalParseMetaData();
    mHasParsedMetadata = true;
  }
Sets the encoded image meta data if needed.
imagepipeline-base/src/main/java/com/facebook/imagepipeline/image/EncodedImage.java