http://bugs.winehq.org/show_bug.cgi?id=33384
--- Comment #9 from Vincent Povirk madewokherd@gmail.com 2013-04-14 18:33:38 CDT --- There isn't any such enum, but most of the pixel formats that were there originally differ only by the last byte, which happens to be within the needed range: http://source.winehq.org/source/include/wincodec.idl#L177
Or if not, it shouldn't be hard to write tests to find the values.