Function _dds_load_layer

modules/dds/texture_loader_dds.cpp:134–395

}

static Ref<Image> _dds_load_layer(Ref<FileAccess> p_file, DDSFormat p_dds_format, uint32_t p_width, uint32_t p_height, uint32_t p_mipmaps, uint32_t p_pitch, uint32_t p_flags, Vector<uint8_t> &r_src_data) {
	const DDSFormatInfo &info = dds_format_info[p_dds_format];

	uint32_t w = p_width;
	uint32_t h = p_height;

	if (info.compressed) {
		// BC compressed.
		w += w % info.divisor;
		h += h % info.divisor;
		if (w != p_width) {
			WARN_PRINT(vformat("%s: DDS width '%d' is not divisible by %d. This is not allowed as per the DDS specification, attempting to load anyway.", p_file->get_path(), p_width, info.divisor));
		}
		if (h != p_height) {
			WARN_PRINT(vformat("%s: DDS height '%d' is not divisible by %d. This is not allowed as per the DDS specification, attempting to load anyway.", p_file->get_path(), p_height, info.divisor));
		}

		uint32_t size = MAX(1u, (w + 3) / 4) * MAX(1u, (h + 3) / 4) * info.block_size;

		if (p_flags & DDSD_LINEARSIZE) {
			ERR_FAIL_COND_V_MSG(size != p_pitch, Ref<Resource>(), "DDS header flags specify that a linear size of the top-level image is present, but the specified size does not match the expected value.");
		} else {
			ERR_FAIL_COND_V_MSG(p_pitch != 0, Ref<Resource>(), "DDS header flags specify that no linear size will given for the top-level image, but a non-zero linear size value is present in the header.");
		}

		for (uint32_t i = 1; i < p_mipmaps; i++) {
			w = MAX(1u, w >> 1);
			h = MAX(1u, h >> 1);

			uint32_t bsize = MAX(1u, (w + 3) / 4) * MAX(1u, (h + 3) / 4) * info.block_size;
			size += bsize;
		}

		r_src_data.resize(size);
		uint8_t *wb = r_src_data.ptrw();
		p_file->get_buffer(wb, size);

	} else {
		// Generic uncompressed.
		uint32_t size = p_width * p_height * info.block_size;

		for (uint32_t i = 1; i < p_mipmaps; i++) {
			w = MAX(1u, w >> 1);
			h = MAX(1u, h >> 1);
			size += w * h * info.block_size;
		}

		// Calculate the space these formats will take up after decoding.
		switch (p_dds_format) {
			case DDS_BGR5A1:
			case DDS_B2GR3A8:
			case DDS_LUMINANCE_ALPHA_4:
				size = size * 2;
				break;

			case DDS_B2GR3:
				size = size * 3;
				break;