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use std::ptr;
use std::fmt;
use std::error::Error;
use std::os::raw::c_int;
use libc;
use parking_lot::Mutex;
use super::ffi;
pub struct XConnection {
pub xlib: ffi::Xlib,
pub xrandr: ffi::Xrandr_2_2_0,
pub xrandr_1_5: Option<ffi::Xrandr>,
pub xcursor: ffi::Xcursor,
pub xinput2: ffi::XInput2,
pub xlib_xcb: ffi::Xlib_xcb,
pub display: *mut ffi::Display,
pub x11_fd: c_int,
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> {
let xlib = ffi::Xlib::open()?;
let xcursor = ffi::Xcursor::open()?;
let xrandr = ffi::Xrandr_2_2_0::open()?;
let xrandr_1_5 = ffi::Xrandr::open().ok();
let xinput2 = ffi::XInput2::open()?;
let xlib_xcb = ffi::Xlib_xcb::open()?;
unsafe { (xlib.XInitThreads)() };
unsafe { (xlib.XSetErrorHandler)(error_handler) };
let display = unsafe {
let display = (xlib.XOpenDisplay)(ptr::null());
if display.is_null() {
return Err(XNotSupported::XOpenDisplayFailed);
}
display
};
let fd = unsafe {
(xlib.XConnectionNumber)(display)
};
Ok(XConnection {
xlib,
xrandr,
xrandr_1_5,
xcursor,
xinput2,
xlib_xcb,
display,
x11_fd: fd,
latest_error: Mutex::new(None),
})
}
#[inline]
pub fn check_errors(&self) -> Result<(), XError> {
let error = self.latest_error.lock().take();
if let Some(error) = error {
Err(error)
} else {
Ok(())
}
}
#[inline]
pub fn ignore_error(&self) {
*self.latest_error.lock() = None;
}
}
impl fmt::Debug for XConnection {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.display.fmt(f)
}
}
impl Drop for XConnection {
#[inline]
fn drop(&mut self) {
unsafe { (self.xlib.XCloseDisplay)(self.display) };
}
}
#[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)
}
}
#[derive(Clone, Debug)]
pub enum XNotSupported {
LibraryOpenError(ffi::OpenError),
XOpenDisplayFailed,
}
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())
}
}