Method decode_image_v2

compat/image_parser_v2.cpp:176–238

used in resource_format_binary

// used in resource_format_binary
Error ImageParserV2::decode_image_v2(Ref<FileAccess> f, Variant &r_v, bool convert_indexed) {
	uint32_t encoding = f->get_32();
	Ref<Image> img;

	if (encoding == V2Image::IMAGE_ENCODING_EMPTY) {
		img.instantiate();
		r_v = img;
		return OK;
	} else if (encoding == V2Image::IMAGE_ENCODING_RAW) {
		uint32_t width = f->get_32();
		uint32_t height = f->get_32();
		uint32_t mipmaps = f->get_32();
		uint32_t old_format = f->get_32();
		if (old_format >= V2Image::Format::FORMAT_YUV_422) {
			old_format += 2; // the image format enum for resources doesn't have YUV422 and YUV444 formats, so it's off by 2 after
		}
		Image::Format fmt = ImageEnumCompat::convert_image_format_enum_v2_to_v4((V2Image::Format)old_format);

		uint32_t datalen = f->get_32();

		Vector<uint8_t> imgdata;
		imgdata.resize(datalen);
		uint8_t *w = imgdata.ptrw();
		f->get_buffer(w, datalen);
		_advance_padding(f, datalen);
		// This is for if we're saving the image as a png.
		if (convert_indexed && (old_format == 5 || old_format == 6 || old_format == 1)) {
			Error err;
			img = ImageParserV2::convert_indexed_image(imgdata, width, height, mipmaps, (V2Image::Format)old_format, &err);
			ERR_FAIL_COND_V_MSG(err, err,
					"Can't convert deprecated image format " + ImageEnumCompat::get_v2_format_name((V2Image::Format)old_format) + " to new image formats!");
		} else {
			// We wait until we've skipped all the data to do this
			ERR_FAIL_COND_V_MSG(
					fmt == Image::FORMAT_MAX && (old_format > 0 && old_format < V2Image::IMAGE_FORMAT_V2_MAX),
					ERR_UNAVAILABLE,
					"Converting deprecated image format " + ImageEnumCompat::get_v2_format_name((V2Image::Format)old_format) + " not implemented.");
			ERR_FAIL_COND_V_MSG(
					fmt == Image::FORMAT_MAX,
					ERR_FILE_CORRUPT,
					"Invalid format");

			img = Image::create_from_data(width, height, mipmaps > 0, fmt, imgdata);
		}
	} else {
		// compressed
		Vector<uint8_t> data;
		data.resize(f->get_32());
		uint8_t *w = data.ptrw();
		f->get_buffer(w, data.size());
		// Godot 2.0 sometimes exported empty images as "IMAGE_ENCODING_LOSSY" rather than "IMAGE_ENCODING_EMPTY", so we need to check for that.
		if (data.size() == 0) {
			img.instantiate();
		} else if (encoding == V2Image::IMAGE_ENCODING_LOSSY) {
			img = WebPCompat::webp_unpack_v2v3(data);
		} else if (encoding == V2Image::IMAGE_ENCODING_LOSSLESS && Image::png_unpacker) {
			img = img->png_unpacker(data);
		}