Add get_x11_xconnection function

src/os/unix.rs

@@ -5,6 +5,7 @@ use std::ptr;
 use libc;
 use Window;
 use platform::Window as LinuxWindow;
+use platform::{UnixBackend, UNIX_BACKEND};
 use WindowBuilder;
 use api::x11::XConnection;
 use api::x11::ffi::XVisualInfo;
@@ -14,6 +15,13 @@ use wayland_client::protocol::wl_surface::WlSurface;
 
 pub use api::x11;
 
+pub fn get_x11_xconnection() -> Option<Arc<XConnection>> {
+    match *UNIX_BACKEND {
+        UnixBackend::X(ref connec) => Some(connec.clone()),
+        _ => None,
+    }
+}
+
 /// Additional methods on `Window` that are specific to Unix.
 pub trait WindowExt {
     /// Returns a pointer to the `Window` object of xlib that is used by this window.
@@ -144,21 +152,21 @@ impl WindowExt for Window {
 
 /// Additional methods on `WindowBuilder` that are specific to Unix.
 pub trait WindowBuilderExt {
-    fn with_visual(self, visual_infos: *const XVisualInfo) -> WindowBuilder;
-    fn with_screen(self, screen_id: i32) -> WindowBuilder;
+    fn with_x11_visual<T>(self, visual_infos: *const T) -> WindowBuilder;
+    fn with_x11_screen(self, screen_id: i32) -> WindowBuilder;
 }
 
 impl WindowBuilderExt for WindowBuilder {
     #[inline]
-    fn with_visual(mut self, visual_infos: *const XVisualInfo) -> WindowBuilder {
+    fn with_x11_visual<T>(mut self, visual_infos: *const T) -> WindowBuilder {
         self.platform_specific.visual_infos = Some(
-            unsafe { ptr::read(visual_infos) }
-            );
+            unsafe { ptr::read(visual_infos as *const XVisualInfo) }
+        );
         self
     }
 
     #[inline]
-    fn with_screen(mut self, screen_id: i32) -> WindowBuilder {
+    fn with_x11_screen(mut self, screen_id: i32) -> WindowBuilder {
         self.platform_specific.screen_id = Some(screen_id);
         self
     }

src/platform/linux/api_dispatch.rs

@@ -21,14 +21,14 @@ pub struct PlatformSpecificWindowBuilderAttributes {
     pub screen_id: Option<i32>,
 }
 
-enum Backend {
+pub enum Backend {
     X(Arc<XConnection>),
     Wayland(Arc<wayland::WaylandContext>),
     Error(XNotSupported),
 } 
 
 lazy_static!(
-    static ref BACKEND: Backend = {
+    pub static ref BACKEND: Backend = {
         if let Some(ctxt) = wayland::WaylandContext::init() {
             Backend::Wayland(Arc::new(ctxt))
         } else {
@@ -40,6 +40,7 @@ lazy_static!(
     };
 );
 
+
 pub enum Window {
     #[doc(hidden)]
     X(x11::Window),

src/platform/linux/mod.rs

@@ -3,5 +3,7 @@
 pub use self::api_dispatch::{Window, WindowProxy, MonitorId, get_available_monitors, get_primary_monitor};
 pub use self::api_dispatch::{WaitEventsIterator, PollEventsIterator};
 pub use self::api_dispatch::PlatformSpecificWindowBuilderAttributes;
+pub use self::api_dispatch::Backend as UnixBackend;
+pub use self::api_dispatch::BACKEND as UNIX_BACKEND;
 
 mod api_dispatch;