public void setFlippedHorizontally(boolean flipHorizontally) {
    if (mFlipHorizontally != flipHorizontally) {
      mFlipHorizontally = flipHorizontally;
      applyImageMatrix(getWidth(), getHeight(), true, false);
    }
  }
Sets whether the image should be flipped horizontally
core/src/main/java/com/theartofdev/edmodo/cropper/CropImageView.java