gdk:visual-best-depth ()

The integer with the best available depth.

Get the best available depth for the default GDK screen. "Best" means "largest", that is 32 preferred over 24 preferred over 8 bits per pixel. The gdk:visual-best-depth function has been deprecated since version 3.22 and should not be used in newly written code. Visual selection should be done using the gdk:screen-system-visual and gdk:screen-rgba-visual functions.