[Bug 26712] Fading in virtual desktop affects the entire screen (Syberia demo, Black Mirror 1 demo, Half-Life demo)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=26712

--- Comment #9 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to Bruno Jesus from comment #8)
> Is any log useful to check this? Would it be possible to make only the game
> window or virtual desktop to receive the gamma changes?

You'd see (probably a lot of) SetDeviceGammaRamp() calls in +dc, and
wined3d_swapchain_set_gamma_ramp() calls in +d3d if it's going through D3D. The
gamma ramps are a property of the CRTC/screen, so you can't set it per-window.
It's usually not really an issue because applications typically only do this
kind of thing in full-screen mode, although sometimes it's visible on Windows
as well on e.g. multi-head setups or when switching away from full-screen
windows. For things that set the gamma ramp through D3D it would in theory be
possible to do the gamma correction in a post-processing shader instead,
although I'm not convinced that would be desirable. For things that go directly
through gdi32 it would be harder, although perhaps it could be done when
flushing window surfaces.

Of course if you just don't want the application to mess with the display
gamma, you can disable UseXVidMode, but then you probably won't get fading at
all.

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