Method read_source_images

engine/dlib/src/basis/encoder/basisu_comp.cpp:466–914

	}

	bool basis_compressor::read_source_images()
	{
		debug_printf("basis_compressor::read_source_images\n");

		const uint32_t total_source_files = m_params.m_read_source_images ? (uint32_t)m_params.m_source_filenames.size() : (uint32_t)m_params.m_source_images.size();
		if (!total_source_files)
			return false;

		m_stats.resize(0);
		m_slice_descs.resize(0);
		m_slice_images.resize(0);

		m_total_blocks = 0;
		uint32_t total_macroblocks = 0;

		m_any_source_image_has_alpha = false;

		basisu::vector<image> source_images;
		basisu::vector<std::string> source_filenames;
		
		// First load all source images, and determine if any have an alpha channel.
		for (uint32_t source_file_index = 0; source_file_index < total_source_files; source_file_index++)
		{
			const char *pSource_filename = "";

			image file_image;
			
			if (m_params.m_read_source_images)
			{
				pSource_filename = m_params.m_source_filenames[source_file_index].c_str();

				// Load the source image
				if (!load_image(pSource_filename, file_image))
				{
					error_printf("Failed reading source image: %s\n", pSource_filename);
					return false;
				}

				if (m_params.m_status_output)
				{
					printf("Read source image \"%s\", %ux%u\n", pSource_filename, file_image.get_width(), file_image.get_height());
				}

				// Optionally load another image and put a grayscale version of it into the alpha channel.
				if ((source_file_index < m_params.m_source_alpha_filenames.size()) && (m_params.m_source_alpha_filenames[source_file_index].size()))
				{
					const char *pSource_alpha_image = m_params.m_source_alpha_filenames[source_file_index].c_str();

					image alpha_data;

					if (!load_image(pSource_alpha_image, alpha_data))
					{
						error_printf("Failed reading source image: %s\n", pSource_alpha_image);
						return false;
					}

					printf("Read source alpha image \"%s\", %ux%u\n", pSource_alpha_image, alpha_data.get_width(), alpha_data.get_height());