.{log} := @use("../../../stn/src/lib.hb");
.{Surface} := @use("../lib.hb")
bmp := @use("bmp.hb")
qoi := @use("qoi.hb")

BMP := 0x4D42
QOI := 0x66696F71
// stand-in for null until bugfix
DOES_NOT_EXIST := 1 << 32

get_format := fn(file: ^u8): uint {
	if *@as(^u16, @bitcast(file)) == BMP {
		return BMP
	} else if *@as(^u32, @bitcast(file)) == QOI {
		return QOI
	} else {
		return DOES_NOT_EXIST
	}
}

from := fn(file: ^u8): ?Surface {
	format := get_format(file)

	if format == DOES_NOT_EXIST {
		log.error("Could not detect image format.\0")
		return null
	} else if format == BMP {
		return bmp.from(file)
	} else if format == QOI {
		return qoi.from(file)
	}

	return null
}