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use std::ptr;
use std::fmt;
use std::error::Error;
use std::ffi::CString;
use std::sync::Mutex;
use libc;
use super::ffi;
use api::egl::ffi::egl::Egl;
use api::dlopen;
/// A connection to an X server.
pub struct XConnection {
pub xlib: ffi::Xlib,
pub xf86vmode: ffi::Xf86vmode,
pub xcursor: ffi::Xcursor,
pub xinput2: ffi::XInput2,
pub glx: Option<ffi::glx::Glx>,
pub egl: Option<Egl>,
pub display: *mut ffi::Display,
pub latest_error: Mutex<Option<XError>>,
}
unsafe impl Send for XConnection {}
unsafe impl Sync for XConnection {}
pub type XErrorHandler = Option<unsafe extern fn(*mut ffi::Display, *mut ffi::XErrorEvent) -> libc::c_int>;
impl XConnection {
pub fn new(error_handler: XErrorHandler) -> Result<XConnection, XNotSupported> {
// opening the libraries
let xlib = try!(ffi::Xlib::open());
let xcursor = try!(ffi::Xcursor::open());
let xf86vmode = try!(ffi::Xf86vmode::open());
let xinput2 = try!(ffi::XInput2::open());
unsafe { (xlib.XInitThreads)() };
unsafe { (xlib.XSetErrorHandler)(error_handler) };
// TODO: use something safer than raw "dlopen"
let glx = {
let mut libglx = unsafe { dlopen::dlopen(b"libGL.so.1\0".as_ptr() as *const _, dlopen::RTLD_NOW) };
if libglx.is_null() {
libglx = unsafe { dlopen::dlopen(b"libGL.so\0".as_ptr() as *const _, dlopen::RTLD_NOW) };
}
if libglx.is_null() {
None
} else {
Some(ffi::glx::Glx::load_with(|sym| {
let sym = CString::new(sym).unwrap();
unsafe { dlopen::dlsym(libglx, sym.as_ptr()) }
}))
}
};
// TODO: use something safer than raw "dlopen"
let egl = {
let mut libegl = unsafe { dlopen::dlopen(b"libEGL.so.1\0".as_ptr() as *const _, dlopen::RTLD_NOW) };
if libegl.is_null() {
libegl = unsafe { dlopen::dlopen(b"libEGL.so\0".as_ptr() as *const _, dlopen::RTLD_NOW) };
}
if libegl.is_null() {
None
} else {
Some(Egl::load_with(|sym| {
let sym = CString::new(sym).unwrap();
unsafe { dlopen::dlsym(libegl, sym.as_ptr()) }
}))
}
};
// calling XOpenDisplay
let display = unsafe {
let display = (xlib.XOpenDisplay)(ptr::null());
if display.is_null() {
return Err(XNotSupported::XOpenDisplayFailed);
}
display
};
Ok(XConnection {
xlib: xlib,
xf86vmode: xf86vmode,
xcursor: xcursor,
xinput2: xinput2,
glx: glx,
egl: egl,
display: display,
latest_error: Mutex::new(None),
})
}
/// Checks whether an error has been triggered by the previous function calls.
#[inline]
pub fn check_errors(&self) -> Result<(), XError> {
let error = self.latest_error.lock().unwrap().take();
if let Some(error) = error {
Err(error)
} else {
Ok(())
}
}
/// Ignores any previous error.
#[inline]
pub fn ignore_error(&self) {
*self.latest_error.lock().unwrap() = None;
}
}
impl Drop for XConnection {
#[inline]
fn drop(&mut self) {
unsafe { (self.xlib.XCloseDisplay)(self.display) };
}
}
/// Error triggered by xlib.
#[derive(Debug, Clone)]
pub struct XError {
pub description: String,
pub error_code: u8,
pub request_code: u8,
pub minor_code: u8,
}
impl Error for XError {
#[inline]
fn description(&self) -> &str {
&self.description
}
}
impl fmt::Display for XError {
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(formatter, "X error: {} (code: {}, request code: {}, minor code: {})",
self.description, self.error_code, self.request_code, self.minor_code)
}
}
/// Error returned if this system doesn't have XLib or can't create an X connection.
#[derive(Clone, Debug)]
pub enum XNotSupported {
/// Failed to load one or several shared libraries.
LibraryOpenError(ffi::OpenError),
/// Connecting to the X server with `XOpenDisplay` failed.
XOpenDisplayFailed, // TODO: add better message
}
impl From<ffi::OpenError> for XNotSupported {
#[inline]
fn from(err: ffi::OpenError) -> XNotSupported {
XNotSupported::LibraryOpenError(err)
}
}
impl Error for XNotSupported {
#[inline]
fn description(&self) -> &str {
match *self {
XNotSupported::LibraryOpenError(_) => "Failed to load one of xlib's shared libraries",
XNotSupported::XOpenDisplayFailed => "Failed to open connection to X server",
}
}
#[inline]
fn cause(&self) -> Option<&Error> {
match *self {
XNotSupported::LibraryOpenError(ref err) => Some(err),
_ => None
}
}
}
impl fmt::Display for XNotSupported {
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
formatter.write_str(self.description())
}
}
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