Function read_bits

Source/astcenc_integer_sequence.cpp:478–490

* @brief Read up to 16 bits from two bytes. * * This function reads a packed N-bit field from two bytes in memory. The stored value must exist * within the two bytes, but can start at an arbitrary bit offset and span the two bytes in memory. * * @param bitcount The number of bits to read. * @param bitoffset The bit offset to read from, between 0 and 7. * @param[in,out]

 * @return The read value.
 */
static inline unsigned int read_bits(
	unsigned int bitcount,
	unsigned int bitoffset,
	const uint8_t* ptr
) {
	unsigned int mask = (1 << bitcount) - 1;
	ptr += bitoffset >> 3;
	bitoffset &= 7;
	unsigned int value = ptr[0] | (ptr[1] << 8);
	value >>= bitoffset;
	value &= mask;
	return value;
}

/* See header for documentation. */
void encode_ise(