Re: Apply filter effect to windows

[Christian Hergert <christian hergert me>]

On 04/18/2018 03:59 PM, Alessandro Re wrote:
> The Night Mode in GNOME shell is performing something similar to what I 
> have in mind, although it is apparently working on the entire screen, 
> and not single windows, but this is still Ok for my use cases, as long 
> as it is possible to read and modify the screen.

Temperature/gamma transforms are usually done using calibration tables 
as part of scan-out (which is why they work on the composited frame).

What you're asking for is transforms as part of the (pre/post)-composite 
phase.

There is not currently API to control the effects pipeline (although I 
hear that kwin this) and I'd certainly like a way for some of this in 
GNOME Builder.

Although I'd prefer to see it as a wayland protocol to enable 
"categories" of filters on a region of a window rather than any sort of 
code/shader upload into the compositor.

-- Christian