private void init() {
    mFadeDuration = DEFAULT_FADE_DURATION;

    mDesiredAspectRatio = 0;

    mPlaceholderImage = null;
    mPlaceholderImageScaleType = DEFAULT_SCALE_TYPE;

    mRetryImage = null;
    mRetryImageScaleType = DEFAULT_SCALE_TYPE;

    mFailureImage = null;
    mFailureImageScaleType = DEFAULT_SCALE_TYPE;

    mProgressBarImage = null;
    mProgressBarImageScaleType = DEFAULT_SCALE_TYPE;

    mActualImageScaleType = DEFAULT_ACTUAL_IMAGE_SCALE_TYPE;
    mActualImageMatrix = null;
    mActualImageFocusPoint = null;
    mActualImageColorFilter = null;

    mBackground = null;
    mOverlays = null;
    mPressedStateOverlay = null;

    mRoundingParams = null;
  }
Initializes this builder to its defaults.
drawee/src/main/java/com/facebook/drawee/generic/GenericDraweeHierarchyBuilder.java