Re: [PATCH v3 0/7] MR6398: winex11: Use offscreen rendering to scale DPI-unaware GL windows.

[Rémi Bernon]

v2: Better version which creates per-drawable DCs instead and fixes missing offscreen drawable resize. 

Fwiw this fixes GL display when DPI scaling is used, and will also work for display mode virtualization, which I also intend to implement with DPI, similarly to how Windows now implements it.

I understand that using a display DC blit isn't great but it allows us to use XRender and to perform not too badly. Ideally this would be using some composition mechanism, but this will require a lot more work and could hopefully later replace it.

It's also not clear whether a compositor is doable in every case, as for instance it will require being able to export/import surfaces as DMA buffers, which simply may not be possible with remote X sessions.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6398#note_81606