false if the display does not support this functionality.
Display.isRgba
bool isRgba()Returns whether surfaces on this display are created with an alpha channel.
Even if a true is returned, it is possible that the surface’s alpha channel won’t be honored when displaying the surface on the screen: in particular, for X an appropriate windowing manager and compositing manager must be running to provide appropriate display. Use [gdk.display.Display.isComposited] to check if that is the case.
On modern displays, this value is always true.
Returns
true if surfaces are created with an alpha channel or