gdkScreenGetRgbaColormap {RGtk2} | R Documentation

## gdkScreenGetRgbaColormap

### Description

Gets a colormap to use for creating windows or pixmaps with an alpha channel. The windowing system on which GTK+ is running may not support this capability, in which case `NULL` will be returned. Even if a non-`NULL` value is returned, its possible that the window's alpha channel won't be honored when displaying the window on the screen: in particular, for X an appropriate windowing manager and compositing manager must be running to provide appropriate display.

### Usage

    gdkScreenGetRgbaColormap(object)

### Arguments

``object`` | a `GdkScreen`.

### Details

This functionality is not implemented in the Windows backend.

For setting an overall opacity for a top-level window, see `gdkWindowSetOpacity`. Since 2.8

### Value

[`GdkColormap`] a colormap to use for windows with an alpha channel or `NULL` if the capability is not available. [ transfer none ]

### Author(s)

Derived by RGtkGen from GTK+ documentation

[Package RGtk2 version 2.20.36.3 Index]