Method create_encoder_blocks

engine/dlib/src/basis/encoder/basisu_backend.cpp:406–617

	}

	void basisu_backend::create_encoder_blocks()
	{
		debug_printf("basisu_backend::create_encoder_blocks\n");

		interval_timer tm;
		tm.start();

		basisu_frontend& r = *m_pFront_end;
		const bool is_video = r.get_params().m_tex_type == basist::cBASISTexTypeVideoFrames;

		m_slice_encoder_blocks.resize(m_slices.size());

		uint32_t total_endpoint_pred_missed = 0, total_endpoint_pred_hits = 0, total_block_endpoints_remapped = 0;

		uint_vec all_endpoint_indices;
		all_endpoint_indices.reserve(get_total_blocks());

		for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
		{
			const int prev_frame_slice_index = is_video ? find_video_frame(slice_index, -1) : -1;
			const bool is_iframe = m_slices[slice_index].m_iframe;
			const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;

			//const uint32_t width = m_slices[slice_index].m_width;
			//const uint32_t height = m_slices[slice_index].m_height;
			const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
			const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;

			m_slice_encoder_blocks[slice_index].resize(num_blocks_x, num_blocks_y);

			for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
			{
				for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
				{
					const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;

					encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);

					m.m_endpoint_index = r.get_subblock_endpoint_cluster_index(block_index, 0);
					BASISU_BACKEND_VERIFY(r.get_subblock_endpoint_cluster_index(block_index, 0) == r.get_subblock_endpoint_cluster_index(block_index, 1));

					m.m_selector_index = r.get_block_selector_cluster_index(block_index);

					m.m_endpoint_predictor = basist::NO_ENDPOINT_PRED_INDEX;

					const uint32_t block_endpoint = m.m_endpoint_index;

					uint32_t best_endpoint_pred = UINT32_MAX;

					for (uint32_t endpoint_pred = 0; endpoint_pred < basist::NUM_ENDPOINT_PREDS; endpoint_pred++)
					{
						if ((is_video) && (endpoint_pred == basist::CR_ENDPOINT_PRED_INDEX))
						{
							if ((prev_frame_slice_index != -1) && (!is_iframe))
							{
								const uint32_t cur_endpoint = m_slice_encoder_blocks[slice_index](block_x, block_y).m_endpoint_index;
								const uint32_t cur_selector = m_slice_encoder_blocks[slice_index](block_x, block_y).m_selector_index;
								const uint32_t prev_endpoint = m_slice_encoder_blocks[prev_frame_slice_index](block_x, block_y).m_endpoint_index;