Method is_luminancealpha

Source/astcenc_internal.h:877–883

* @brief Test if this block is a luminance block with variable alpha. * * @return @c true if the block is a luminance + alpha block , @c false otherwise. */

	 * @return @c true if the block is a luminance + alpha block , @c false otherwise.
	 */
	inline bool is_luminancealpha() const
	{
		float default_alpha = this->get_default_alpha();
		bool alpha1 = (this->data_min.lane<3>() == default_alpha) &&
		              (this->data_max.lane<3>() == default_alpha);
		return this->grayscale && !alpha1;
	}
};

/**