https://bugs.winehq.org/show_bug.cgi?id=48492
--- Comment #12 from Esme Povirk madewokherd@gmail.com --- Created attachment 67214 --> https://bugs.winehq.org/attachment.cgi?id=67214 test
I wrote a test for this. It seems native accepts arbitrary bitfields, but it converts them to 32bppBGR, ignoring alpha information.