[Bug 37398] Urban Assault black screen when using software renderer and DDSCAPS_SYSTEMMEMORY

https://bugs.winehq.org/show_bug.cgi?id=37398

--- Comment #10 from Erich E. Hoover  ---
(In reply to Stefan Dösinger from comment #9)
> Hmm, it sounds like the game wants palettized blits to just pass data from
> src to dst surface without doing any palette lookup or other conversions.
> But I think this is what the current code should already do.
>
> Can you check what the format of the destination surface is in the affected
> blits?

This is actually to get the primary surface to work, without the patch (on
current git) I get:
fixme:d3d_surface:surface_convert_format Cannot find a conversion function from
format WINED3DFMT_P8_UINT to WINED3DFMT_B5G6R5_UNORM.