code: public Texture texture () {
      if (texture == null || texture.disposed()) texture = createTexture(texconf);
      return texture;
    }
docs: Returns, creating if necessary, this image's default texture. When the texture is created, it
  will use the {@link Texture.Config} set via {@link #setConfig}. If an image's default texture
  is {@link Texture#close}d, a subsequent call to this method will create a new default texture.