Get the monitors attached to the display, and their resolution for X11

src/x11/ffi.rs

@@ -29,6 +29,7 @@ pub type XrmDatabase = *const ();       // TODO: not sure
 pub type XIC = *mut ();
 pub type XID = uint;
 pub type XIM = *mut ();
+pub type Screen = ();
 
 pub static AllocNone: libc::c_int = 0;
 pub static AllocAll: libc::c_int = 1;
@@ -1393,6 +1394,10 @@ extern "C" {
     pub fn XSetWMProtocols(display: *mut Display, w: Window, protocols: *mut Atom,
         count: libc::c_int) -> Status;
     pub fn XStoreName(display: *mut Display, w: Window, window_name: *const libc::c_char);
+    pub fn XScreenCount(display: *mut Display) -> libc::c_int;
+    pub fn XScreenOfDisplay(display: *mut Display, screen_number: libc::c_int) -> *const Screen;
+    pub fn XWidthOfScreen(screen: *const Screen) -> libc::c_int;
+    pub fn XHeightOfScreen(screen: *const Screen) -> libc::c_int;
 
     pub fn XCloseIM(im: XIM) -> Status;
     pub fn XOpenIM(display: *mut Display, db: XrmDatabase, res_name: *mut libc::c_char,

src/x11/mod.rs

@@ -3,8 +3,11 @@ use libc;
 use std::{mem, ptr};
 use std::sync::atomics::AtomicBool;
 
+pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
+
 mod events;
 mod ffi;
+mod monitor;
 
 pub struct Window {
     display: *mut ffi::Display,
@@ -19,28 +22,6 @@ pub struct Window {
     is_fullscreen: bool,
 }
 
-pub struct MonitorID(uint);
-
-pub fn get_available_monitors() -> Vec<MonitorID> {
-    vec![get_primary_monitor()]
-}
-
-pub fn get_primary_monitor() -> MonitorID {
-    MonitorID(0u)
-}
-
-impl MonitorID {
-    pub fn get_name(&self) -> Option<String> {
-        Some("<Unknown>".to_string())
-    }
-
-    pub fn get_dimensions(&self) -> (uint, uint) {
-        //unimplemented!()
-        // TODO: Get the real dimensions from the monitor
-        (1024, 768)
-    }
-}
-
 impl Window {
     pub fn new(builder: WindowBuilder) -> Result<Window, String> {
         let dimensions = builder.dimensions.unwrap_or((800, 600));
@@ -159,7 +140,7 @@ impl Window {
 
         // finally creating the window
         let window = unsafe {
-            let win = ffi::XCreateWindow(display, root, 50, 50, dimensions.val0() as libc::c_uint,
+            let win = ffi::XCreateWindow(display, root, 0, 0, dimensions.val0() as libc::c_uint,
                 dimensions.val1() as libc::c_uint, 0, visual_infos.depth, ffi::InputOutput,
                 visual_infos.visual, window_attributes,
                 &mut set_win_attr);

src/x11/monitor.rs

@@ -0,0 +1,54 @@
+use std::{ptr};
+use super::ffi;
+
+pub struct MonitorID(uint);
+
+pub fn get_available_monitors() -> Vec<MonitorID> {
+    let nb_monitors = unsafe {
+        let display = ffi::XOpenDisplay(ptr::null());
+        if display.is_null() {
+            fail!("get_available_monitors failed");
+        }
+        let nb_monitors = ffi::XScreenCount(display);
+        ffi::XCloseDisplay(display);
+        nb_monitors
+    };
+
+    let mut vec = Vec::new();
+    vec.grow_fn(nb_monitors as uint, |i| MonitorID(i));
+    vec
+}
+
+pub fn get_primary_monitor() -> MonitorID {
+    let primary_monitor = unsafe {
+        let display = ffi::XOpenDisplay(ptr::null());
+        if display.is_null() {
+            fail!("get_available_monitors failed");
+        }
+        let primary_monitor = ffi::XDefaultScreen(display);
+        ffi::XCloseDisplay(display);
+        primary_monitor
+    };
+
+    MonitorID(primary_monitor as uint)
+}
+
+impl MonitorID {
+    pub fn get_name(&self) -> Option<String> {
+        Some("<Unknown>".to_string())
+    }
+
+    pub fn get_dimensions(&self) -> (uint, uint) {
+        let dimensions = unsafe {
+            let display = ffi::XOpenDisplay(ptr::null());
+            let MonitorID(screen_num) = *self;
+            let screen = ffi::XScreenOfDisplay(display, screen_num as i32);
+            let width = ffi::XWidthOfScreen(screen);
+            let height = ffi::XHeightOfScreen(screen);
+            (width as uint, height as uint)
+        };
+
+        dimensions
+    }
+}
+