code: public GenericDraweeHierarchyBuilder setActualImageScaleType(
        @Nullable ScalingUtils.ScaleType actualImageScaleType) {
      mActualImageScaleType = actualImageScaleType;
      mActualImageMatrix = null;
      return this;
    }
docs: Sets the scale type for the actual image.
  
  <p>If not set, the default value CENTER_CROP will be used.
  
  @param actualImageScaleType scale type for the actual image
  @return modified instance of this builder