Simple 1:1 interface to Xlib for ruby

This gem just wraps Xlib including Xrender and Xrandr and makes its interface available in ruby through ffi. Xlib documentation can be found in its manual. No functions have been renamed or abstracted away in some objects. It's just the plain Xlib API.

For a lightweight wrapper and a more ruby style access to X11 have a look at ruby-xlib-objects.

Installation

gem install xlib

Usage

The API lives in the Xlib namespace.

display_pointer = Xlib.XOpenDisplay(':0')
display = Xlib::Display.new(display_pointer)

screens = (0..display[:nscreens]-1).map do |number|
  screen_pointer = display[:screens] + number*Xlib::Screen.size
  Xlib::Screen.new(screen_pointer)
end

root_windows = screens.map do |screen|
  Xlib.XRootWindowOfScreen(screen.pointer)
end

root_window_sizes = root_windows.map do |root_win|
  attributes = Xlib::WindowAttributes.new
  Xlib.XGetWindowAttributes(display.pointer, root_win.pointer, attributes.
    pointer)
  { width: attributes[:width], height: attributes[:height] }
end