Method decode_palettes

engine/dlib/src/basis/transcoder/basisu_transcoder.cpp:7565–7747

	}

	bool basisu_lowlevel_etc1s_transcoder::decode_palettes(
		uint32_t num_endpoints, const uint8_t* pEndpoints_data, uint32_t endpoints_data_size,
		uint32_t num_selectors, const uint8_t* pSelectors_data, uint32_t selectors_data_size)
	{
		if (m_pGlobal_codebook)
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 11\n");
			return false;
		}
		bitwise_decoder sym_codec;

		huffman_decoding_table color5_delta_model0, color5_delta_model1, color5_delta_model2, inten_delta_model;

		if (!sym_codec.init(pEndpoints_data, endpoints_data_size))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 0\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(color5_delta_model0))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 1\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(color5_delta_model1))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 1a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(color5_delta_model2))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 2a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(inten_delta_model))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 2b\n");
			return false;
		}

		if (!color5_delta_model0.is_valid() || !color5_delta_model1.is_valid() || !color5_delta_model2.is_valid() || !inten_delta_model.is_valid())
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_etc1s_transcoder::decode_palettes: fail 2b\n");
			return false;
		}

		const bool endpoints_are_grayscale = sym_codec.get_bits(1) != 0;

		m_local_endpoints.resize(num_endpoints);

		color32 prev_color5(16, 16, 16, 0);
		uint32_t prev_inten = 0;

		for (uint32_t i = 0; i < num_endpoints; i++)
		{