Returns the number of significant bits per red, green and blue value.
Not all GDK backend provide a meaningful value for this function.
Deprecated: Use gdk_visual_get_red_pixel_details() and its variants to learn about the pixel layout of TrueColor and DirectColor visuals
Return: The number of significant bits per color value for @visual.
2.22
See Implementation
Returns the number of significant bits per red, green and blue value.
Not all GDK backend provide a meaningful value for this function.