[Bug 58662] 16-bit bitmap rendering

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58662

Rémi Bernon  changed:

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--- Comment #4 from Rémi Bernon  ---
Yeah I think faking the pixel format and fixing up when uploading/downloading
the pixels seems the easiest approach here. You can have a look at
`flush_memory_dc` in dlls/win32u/opengl.c which is where this is being done
with memory DCs.