public GenericDraweeHierarchyBuilder setPlaceholderImageScaleType(
      @Nullable ScalingUtils.ScaleType placeholderImageScaleType) {
    mPlaceholderImageScaleType = placeholderImageScaleType;
    return this;
  }
Sets the placeholder image scale type.

<p>If not set, the default value CENTER_INSIDE will be used.

@param placeholderImageScaleType scale type for the placeholder image
@return modified instance of this builder
drawee/src/main/java/com/facebook/drawee/generic/GenericDraweeHierarchyBuilder.java