Method dump_debug_image

external/basisu/encoder/basisu_frontend.cpp:3412–3455

	}

	void basisu_frontend::dump_debug_image(const char *pFilename, uint32_t first_block, uint32_t num_blocks_x, uint32_t num_blocks_y, bool output_blocks)
	{
		gpu_image g;
		g.init(texture_format::cETC1, num_blocks_x * 4, num_blocks_y * 4);

		for (uint32_t y = 0; y < num_blocks_y; y++)
		{
			for (uint32_t x = 0; x < num_blocks_x; x++)
			{
				const uint32_t block_index = first_block + x + y * num_blocks_x;

				etc_block &blk = *(etc_block *)g.get_block_ptr(x, y);

				if (output_blocks)
					blk = get_output_block(block_index);
				else
				{
					const bool diff_flag = get_diff_flag(block_index);

					blk.set_diff_bit(diff_flag);
					blk.set_flip_bit(true);

					const uint32_t endpoint_cluster0_index = get_subblock_endpoint_cluster_index(block_index, 0);
					const uint32_t endpoint_cluster1_index = get_subblock_endpoint_cluster_index(block_index, 1);

					if (diff_flag)
						blk.set_block_color5(get_endpoint_cluster_unscaled_color(endpoint_cluster0_index, false), get_endpoint_cluster_unscaled_color(endpoint_cluster1_index, false));
					else
						blk.set_block_color4(get_endpoint_cluster_unscaled_color(endpoint_cluster0_index, true), get_endpoint_cluster_unscaled_color(endpoint_cluster1_index, true));

					blk.set_inten_table(0, get_endpoint_cluster_inten_table(endpoint_cluster0_index, !diff_flag));
					blk.set_inten_table(1, get_endpoint_cluster_inten_table(endpoint_cluster1_index, !diff_flag));

					const uint32_t selector_cluster_index = get_block_selector_cluster_index(block_index);
					blk.set_raw_selector_bits(get_selector_cluster_selector_bits(selector_cluster_index).get_raw_selector_bits());
				}
			}
		}

		image img;
		g.unpack(img);

		save_png(pFilename, img);
	}

} // namespace basisu