Function get_ise_sequence_bitcount

Source/astcenc_integer_sequence.cpp:419–433

See header for documentation. */

/* See header for documentation. */
unsigned int get_ise_sequence_bitcount(
	unsigned int character_count,
	quant_method quant_level
) {
	// Cope with out-of bounds values - input might be invalid
	if (static_cast<size_t>(quant_level) >= ise_sizes.size())
	{
		// Arbitrary large number that's more than an ASTC block can hold
		return 1024;
	}

	auto& entry = ise_sizes[quant_level];
	unsigned int divisor = (entry.divisor << 1) + 1;
	return (entry.scale * character_count + divisor - 1) / divisor;
}

/**
 * @brief Write up to 8 bits at an arbitrary bit offset.