Aaron Plattner authored Feb 04, 2020 and Marge Bot committed Jan 11, 2021

When supported, this property allows the window system to apply a 3x3 color
correction matrix in order to transform colors from the window system's native
color space to the measured color space of a display device.

Query for this property and set the 'supports-color-transform' property in the
GetResource reply. Add support for the SetOutputCTM DBus method and plumb that
through to the server's CTM property.

Part-of: <GNOME/mutter!1048>