Class decimation_mode

Source/astcenc_internal.h:449–512

* @brief Metadata for single decimation mode for a specific block size. */

 * @brief Metadata for single decimation mode for a specific block size.
 */
struct decimation_mode
{
	/** @brief The max weight precision for 1 plane, or -1 if not supported. */
	int8_t maxprec_1plane;

	/** @brief The max weight precision for 2 planes, or -1 if not supported. */
	int8_t maxprec_2planes;

	/**
	 * @brief Bitvector indicating weight quant modes used by active 1 plane block modes.
	 *
	 * Bit 0 = QUANT_2, Bit 1 = QUANT_3, etc.
	 */
	uint16_t refprec_1plane;

	/**
	 * @brief Bitvector indicating weight quant methods used by active 2 plane block modes.
	 *
	 * Bit 0 = QUANT_2, Bit 1 = QUANT_3, etc.
	 */
	uint16_t refprec_2planes;

	/**
	 * @brief Set a 1 plane weight quant as active.
	 *
	 * @param weight_quant   The quant method to set.
	 */
	void set_ref_1plane(quant_method weight_quant)
	{
		refprec_1plane |= (1 << weight_quant);
	}

	/**
	 * @brief Test if this mode is active below a given 1 plane weight quant (inclusive).
	 *
	 * @param max_weight_quant   The max quant method to test.
	 */
	bool is_ref_1plane(quant_method max_weight_quant) const
	{
		uint16_t mask = static_cast<uint16_t>((1 << (max_weight_quant + 1)) - 1);
		return (refprec_1plane & mask) != 0;
	}

	/**
	 * @brief Set a 2 plane weight quant as active.
	 *
	 * @param weight_quant   The quant method to set.
	 */
	void set_ref_2plane(quant_method weight_quant)
	{
		refprec_2planes |= static_cast<uint16_t>(1 << weight_quant);
	}

	/**
	 * @brief Test if this mode is active below a given 2 plane weight quant (inclusive).
	 *
	 * @param max_weight_quant   The max quant method to test.
	 */