use {Event, BuilderAttribs, MouseCursor}; use CreationError; use CreationError::OsError; use libc; use std::borrow::Borrow; use std::{mem, ptr}; use std::cell::Cell; use std::sync::atomic::AtomicBool; use std::collections::VecDeque; use std::sync::{Arc, Mutex}; use Api; use ContextError; use CursorState; use GlContext; use GlRequest; use PixelFormat; use api::glx::Context as GlxContext; use api::egl; use api::egl::Context as EglContext; use platform::MonitorID as PlatformMonitorID; use super::input::XInputEventHandler; use super::{ffi}; use super::{MonitorID, XConnection}; // XOpenIM doesn't seem to be thread-safe lazy_static! { // TODO: use a static mutex when that's possible, and put me back in my function static ref GLOBAL_XOPENIM_LOCK: Mutex<()> = Mutex::new(()); } // TODO: remove me fn with_c_str(s: &str, f: F) -> T where F: FnOnce(*const libc::c_char) -> T { use std::ffi::CString; let c_str = CString::new(s.as_bytes().to_vec()).unwrap(); f(c_str.as_ptr()) } struct WindowProxyData { display: Arc, window: ffi::Window, } unsafe impl Send for WindowProxyData {} pub struct XWindow { display: Arc, window: ffi::Window, pub context: Context, is_fullscreen: bool, screen_id: libc::c_int, xf86_desk_mode: *mut ffi::XF86VidModeModeInfo, ic: ffi::XIC, im: ffi::XIM, colormap: ffi::Colormap, window_proxy_data: Arc>>, } pub enum Context { Glx(GlxContext), Egl(EglContext), None, } unsafe impl Send for XWindow {} unsafe impl Sync for XWindow {} unsafe impl Send for Window {} unsafe impl Sync for Window {} impl Drop for XWindow { fn drop(&mut self) { unsafe { // Clear out the window proxy data arc, so that any window proxy objects // are no longer able to send messages to this window. *self.window_proxy_data.lock().unwrap() = None; // we don't call MakeCurrent(0, 0) because we are not sure that the context // is still the current one self.context = Context::None; let _lock = GLOBAL_XOPENIM_LOCK.lock().unwrap(); if self.is_fullscreen { (self.display.xf86vmode.XF86VidModeSwitchToMode)(self.display.display, self.screen_id, self.xf86_desk_mode); (self.display.xf86vmode.XF86VidModeSetViewPort)(self.display.display, self.screen_id, 0, 0); } (self.display.xlib.XDestroyIC)(self.ic); (self.display.xlib.XCloseIM)(self.im); (self.display.xlib.XDestroyWindow)(self.display.display, self.window); (self.display.xlib.XFreeColormap)(self.display.display, self.colormap); } } } #[derive(Clone)] pub struct WindowProxy { data: Arc>>, } impl WindowProxy { pub fn wakeup_event_loop(&self) { let window_proxy_data = self.data.lock().unwrap(); if let Some(ref data) = *window_proxy_data { let mut xev = ffi::XClientMessageEvent { type_: ffi::ClientMessage, window: data.window, format: 32, message_type: 0, serial: 0, send_event: 0, display: data.display.display, data: unsafe { mem::zeroed() }, }; unsafe { (data.display.xlib.XSendEvent)(data.display.display, data.window, 0, 0, mem::transmute(&mut xev)); (data.display.xlib.XFlush)(data.display.display); } } } } // XEvents of type GenericEvent store their actual data // in an XGenericEventCookie data structure. This is a wrapper // to extract the cookie from a GenericEvent XEvent and release // the cookie data once it has been processed struct GenericEventCookie<'a> { display: &'a XConnection, cookie: ffi::XGenericEventCookie } impl<'a> GenericEventCookie<'a> { fn from_event<'b>(display: &'b XConnection, event: ffi::XEvent) -> Option> { unsafe { let mut cookie: ffi::XGenericEventCookie = From::from(event); if (display.xlib.XGetEventData)(display.display, &mut cookie) == ffi::True { Some(GenericEventCookie{display: display, cookie: cookie}) } else { None } } } } impl<'a> Drop for GenericEventCookie<'a> { fn drop(&mut self) { unsafe { let xlib = &self.display.xlib; (xlib.XFreeEventData)(self.display.display, &mut self.cookie); } } } pub struct PollEventsIterator<'a> { window: &'a Window } impl<'a> Iterator for PollEventsIterator<'a> { type Item = Event; fn next(&mut self) -> Option { let xlib = &self.window.x.display.xlib; loop { if let Some(ev) = self.window.pending_events.lock().unwrap().pop_front() { return Some(ev); } let mut xev = unsafe { mem::uninitialized() }; let res = unsafe { (xlib.XCheckMaskEvent)(self.window.x.display.display, -1, &mut xev) }; if res == 0 { let res = unsafe { (xlib.XCheckTypedEvent)(self.window.x.display.display, ffi::ClientMessage, &mut xev) }; if res == 0 { let res = unsafe { (xlib.XCheckTypedEvent)(self.window.x.display.display, ffi::GenericEvent, &mut xev) }; if res == 0 { return None; } } } match xev.get_type() { ffi::MappingNotify => { unsafe { (xlib.XRefreshKeyboardMapping)(mem::transmute(&xev)); } }, ffi::ClientMessage => { use events::Event::{Closed, Awakened}; use std::sync::atomic::Ordering::Relaxed; let client_msg: &ffi::XClientMessageEvent = unsafe { mem::transmute(&xev) }; if client_msg.data.get_long(0) == self.window.wm_delete_window as libc::c_long { self.window.is_closed.store(true, Relaxed); return Some(Closed); } else { return Some(Awakened); } }, ffi::ConfigureNotify => { use events::Event::Resized; let cfg_event: &ffi::XConfigureEvent = unsafe { mem::transmute(&xev) }; let (current_width, current_height) = self.window.current_size.get(); if current_width != cfg_event.width || current_height != cfg_event.height { self.window.current_size.set((cfg_event.width, cfg_event.height)); return Some(Resized(cfg_event.width as u32, cfg_event.height as u32)); } }, ffi::Expose => { use events::Event::Refresh; return Some(Refresh); }, ffi::KeyPress | ffi::KeyRelease => { let mut event: &mut ffi::XKeyEvent = unsafe { mem::transmute(&mut xev) }; let events = self.window.input_handler.lock().unwrap().translate_key_event(&mut event); for event in events { self.window.pending_events.lock().unwrap().push_back(event); } }, ffi::GenericEvent => { if let Some(cookie) = GenericEventCookie::from_event(self.window.x.display.borrow(), xev) { match cookie.cookie.evtype { ffi::XI_DeviceChanged...ffi::XI_LASTEVENT => { match self.window.input_handler.lock() { Ok(mut handler) => { match handler.translate_event(&cookie.cookie) { Some(event) => self.window.pending_events.lock().unwrap().push_back(event), None => {} } }, Err(_) => {} } }, _ => {} } } } _ => {} }; } } } pub struct WaitEventsIterator<'a> { window: &'a Window, } impl<'a> Iterator for WaitEventsIterator<'a> { type Item = Event; fn next(&mut self) -> Option { use std::sync::atomic::Ordering::Relaxed; use std::mem; while !self.window.is_closed.load(Relaxed) { if let Some(ev) = self.window.pending_events.lock().unwrap().pop_front() { return Some(ev); } // this will block until an event arrives, but doesn't remove // it from the queue let mut xev = unsafe { mem::uninitialized() }; unsafe { (self.window.x.display.xlib.XPeekEvent)(self.window.x.display.display, &mut xev) }; // calling poll_events() if let Some(ev) = self.window.poll_events().next() { return Some(ev); } } None } } pub struct Window { pub x: Arc, is_closed: AtomicBool, wm_delete_window: ffi::Atom, current_size: Cell<(libc::c_int, libc::c_int)>, /// Events that have been retreived with XLib but not dispatched with iterators yet pending_events: Mutex>, cursor_state: Mutex, input_handler: Mutex } impl Window { pub fn new(display: &Arc, builder: BuilderAttribs) -> Result { let dimensions = builder.window.dimensions.unwrap_or((800, 600)); let screen_id = match builder.window.monitor { Some(PlatformMonitorID::X(MonitorID(_, monitor))) => monitor as i32, _ => unsafe { (display.xlib.XDefaultScreen)(display.display) }, }; // finding the mode to switch to if necessary let (mode_to_switch_to, xf86_desk_mode) = unsafe { let mut mode_num: libc::c_int = mem::uninitialized(); let mut modes: *mut *mut ffi::XF86VidModeModeInfo = mem::uninitialized(); if (display.xf86vmode.XF86VidModeGetAllModeLines)(display.display, screen_id, &mut mode_num, &mut modes) == 0 { return Err(OsError(format!("Could not query the video modes"))); } let xf86_desk_mode = *modes.offset(0); // FIXME: `XF86VidModeModeInfo` is missing its `hskew` field. Therefore we point to // `vsyncstart` instead of `vdisplay` as a temporary hack. let mode_to_switch_to = if builder.window.monitor.is_some() { let matching_mode = (0 .. mode_num).map(|i| { let m: ffi::XF86VidModeModeInfo = ptr::read(*modes.offset(i as isize) as *const _); m }).find(|m| m.hdisplay == dimensions.0 as u16 && m.vsyncstart == dimensions.1 as u16); if let Some(matching_mode) = matching_mode { Some(matching_mode) } else { let m = (0 .. mode_num).map(|i| { let m: ffi::XF86VidModeModeInfo = ptr::read(*modes.offset(i as isize) as *const _); m }).find(|m| m.hdisplay >= dimensions.0 as u16 && m.vsyncstart == dimensions.1 as u16); match m { Some(m) => Some(m), None => return Err(OsError(format!("Could not find a suitable graphics mode"))) } } } else { None }; (display.xlib.XFree)(modes as *mut _); (mode_to_switch_to, xf86_desk_mode) }; // start the context building process enum Prototype<'a> { Glx(::api::glx::ContextPrototype<'a>), Egl(::api::egl::ContextPrototype<'a>), } let builder_clone = builder.clone(); let builder_clone_opengl_glx = builder_clone.opengl.clone().map_sharing(|_| unimplemented!()); // FIXME: let builder_clone_opengl_egl = builder_clone.opengl.clone().map_sharing(|_| unimplemented!()); // FIXME: let context = match builder.opengl.version { GlRequest::Latest | GlRequest::Specific(Api::OpenGl, _) | GlRequest::GlThenGles { .. } => { // GLX should be preferred over EGL, otherwise crashes may occur // on X11 – issue #314 if let Some(ref glx) = display.glx { Prototype::Glx(try!(GlxContext::new(glx.clone(), &display.xlib, &builder_clone.pf_reqs, &builder_clone_opengl_glx, display.display))) } else if let Some(ref egl) = display.egl { Prototype::Egl(try!(EglContext::new(egl.clone(), &builder_clone.pf_reqs, &builder_clone_opengl_egl, egl::NativeDisplay::X11(Some(display.display as *const _))))) } else { return Err(CreationError::NotSupported); } }, GlRequest::Specific(Api::OpenGlEs, _) => { if let Some(ref egl) = display.egl { Prototype::Egl(try!(EglContext::new(egl.clone(), &builder_clone.pf_reqs, &builder_clone_opengl_egl, egl::NativeDisplay::X11(Some(display.display as *const _))))) } else { return Err(CreationError::NotSupported); } }, GlRequest::Specific(_, _) => { return Err(CreationError::NotSupported); }, }; // getting the `visual_infos` (a struct that contains information about the visual to use) let visual_infos = match context { Prototype::Glx(ref p) => p.get_visual_infos().clone(), Prototype::Egl(ref p) => { unsafe { let mut template: ffi::XVisualInfo = mem::zeroed(); template.visualid = p.get_native_visual_id() as ffi::VisualID; let mut num_visuals = 0; let vi = (display.xlib.XGetVisualInfo)(display.display, ffi::VisualIDMask, &mut template, &mut num_visuals); assert!(!vi.is_null()); assert!(num_visuals == 1); let vi_copy = ptr::read(vi as *const _); (display.xlib.XFree)(vi as *mut _); vi_copy } }, }; // getting the root window let root = unsafe { (display.xlib.XDefaultRootWindow)(display.display) }; // creating the color map let cmap = unsafe { let cmap = (display.xlib.XCreateColormap)(display.display, root, visual_infos.visual as *mut _, ffi::AllocNone); // TODO: error checking? cmap }; // creating let mut set_win_attr = { let mut swa: ffi::XSetWindowAttributes = unsafe { mem::zeroed() }; swa.colormap = cmap; swa.event_mask = ffi::ExposureMask | ffi::StructureNotifyMask | ffi::VisibilityChangeMask | ffi::KeyPressMask | ffi::PointerMotionMask | ffi::KeyReleaseMask | ffi::ButtonPressMask | ffi::ButtonReleaseMask | ffi::KeymapStateMask; swa.border_pixel = 0; if builder.window.transparent { swa.background_pixel = 0; } swa.override_redirect = 0; swa }; let mut window_attributes = ffi::CWBorderPixel | ffi::CWColormap | ffi::CWEventMask; if builder.window.transparent { window_attributes |= ffi::CWBackPixel; } // switching to fullscreen if let Some(mut mode_to_switch_to) = mode_to_switch_to { window_attributes |= ffi::CWOverrideRedirect; unsafe { (display.xf86vmode.XF86VidModeSwitchToMode)(display.display, screen_id, &mut mode_to_switch_to); (display.xf86vmode.XF86VidModeSetViewPort)(display.display, screen_id, 0, 0); set_win_attr.override_redirect = 1; } } // finally creating the window let window = unsafe { let win = (display.xlib.XCreateWindow)(display.display, root, 0, 0, dimensions.0 as libc::c_uint, dimensions.1 as libc::c_uint, 0, visual_infos.depth, ffi::InputOutput as libc::c_uint, visual_infos.visual as *mut _, window_attributes, &mut set_win_attr); win }; // set visibility if builder.window.visible { unsafe { (display.xlib.XMapRaised)(display.display, window); (display.xlib.XFlush)(display.display); } } // creating window, step 2 let wm_delete_window = unsafe { let mut wm_delete_window = with_c_str("WM_DELETE_WINDOW", |delete_window| (display.xlib.XInternAtom)(display.display, delete_window, 0) ); (display.xlib.XSetWMProtocols)(display.display, window, &mut wm_delete_window, 1); with_c_str(&*builder.window.title, |title| {; (display.xlib.XStoreName)(display.display, window, title); }); (display.xlib.XFlush)(display.display); wm_delete_window }; // creating IM let im = unsafe { let _lock = GLOBAL_XOPENIM_LOCK.lock().unwrap(); let im = (display.xlib.XOpenIM)(display.display, ptr::null_mut(), ptr::null_mut(), ptr::null_mut()); if im.is_null() { return Err(OsError(format!("XOpenIM failed"))); } im }; // creating input context let ic = unsafe { let ic = with_c_str("inputStyle", |input_style| with_c_str("clientWindow", |client_window| (display.xlib.XCreateIC)( im, input_style, ffi::XIMPreeditNothing | ffi::XIMStatusNothing, client_window, window, ptr::null::<()>() ) ) ); if ic.is_null() { return Err(OsError(format!("XCreateIC failed"))); } (display.xlib.XSetICFocus)(ic); ic }; // Attempt to make keyboard input repeat detectable unsafe { let mut supported_ptr = ffi::False; (display.xlib.XkbSetDetectableAutoRepeat)(display.display, ffi::True, &mut supported_ptr); if supported_ptr == ffi::False { return Err(OsError(format!("XkbSetDetectableAutoRepeat failed"))); } } // Set ICCCM WM_CLASS property based on initial window title unsafe { with_c_str(&*builder.window.title, |c_name| { let hint = (display.xlib.XAllocClassHint)(); (*hint).res_name = c_name as *mut libc::c_char; (*hint).res_class = c_name as *mut libc::c_char; (display.xlib.XSetClassHint)(display.display, window, hint); (display.xlib.XFree)(hint as *mut libc::c_void); }); } let is_fullscreen = builder.window.monitor.is_some(); // finish creating the OpenGL context let context = match context { Prototype::Glx(ctxt) => { Context::Glx(try!(ctxt.finish(window))) }, Prototype::Egl(ctxt) => { Context::Egl(try!(ctxt.finish(window as *const libc::c_void))) }, }; // creating the window object let window_proxy_data = WindowProxyData { display: display.clone(), window: window, }; let window_proxy_data = Arc::new(Mutex::new(Some(window_proxy_data))); let window = Window { x: Arc::new(XWindow { display: display.clone(), window: window, im: im, ic: ic, context: context, screen_id: screen_id, is_fullscreen: is_fullscreen, xf86_desk_mode: xf86_desk_mode, colormap: cmap, window_proxy_data: window_proxy_data, }), is_closed: AtomicBool::new(false), wm_delete_window: wm_delete_window, current_size: Cell::new((0, 0)), pending_events: Mutex::new(VecDeque::new()), cursor_state: Mutex::new(CursorState::Normal), input_handler: Mutex::new(XInputEventHandler::new(display, window, ic)) }; // returning Ok(window) } pub fn set_title(&self, title: &str) { with_c_str(title, |title| unsafe { (self.x.display.xlib.XStoreName)(self.x.display.display, self.x.window, title); (self.x.display.xlib.XFlush)(self.x.display.display); }) } pub fn show(&self) { unsafe { (self.x.display.xlib.XMapRaised)(self.x.display.display, self.x.window); (self.x.display.xlib.XFlush)(self.x.display.display); } } pub fn hide(&self) { unsafe { (self.x.display.xlib.XUnmapWindow)(self.x.display.display, self.x.window); (self.x.display.xlib.XFlush)(self.x.display.display); } } fn get_geometry(&self) -> Option<(i32, i32, u32, u32, u32)> { unsafe { use std::mem; let mut root: ffi::Window = mem::uninitialized(); let mut x: libc::c_int = mem::uninitialized(); let mut y: libc::c_int = mem::uninitialized(); let mut width: libc::c_uint = mem::uninitialized(); let mut height: libc::c_uint = mem::uninitialized(); let mut border: libc::c_uint = mem::uninitialized(); let mut depth: libc::c_uint = mem::uninitialized(); if (self.x.display.xlib.XGetGeometry)(self.x.display.display, self.x.window, &mut root, &mut x, &mut y, &mut width, &mut height, &mut border, &mut depth) == 0 { return None; } Some((x as i32, y as i32, width as u32, height as u32, border as u32)) } } pub fn get_position(&self) -> Option<(i32, i32)> { self.get_geometry().map(|(x, y, _, _, _)| (x, y)) } pub fn set_position(&self, x: i32, y: i32) { unsafe { (self.x.display.xlib.XMoveWindow)(self.x.display.display, self.x.window, x as libc::c_int, y as libc::c_int); } } pub fn get_inner_size(&self) -> Option<(u32, u32)> { self.get_geometry().map(|(_, _, w, h, _)| (w, h)) } pub fn get_outer_size(&self) -> Option<(u32, u32)> { self.get_geometry().map(|(_, _, w, h, b)| (w + b, h + b)) // TODO: is this really outside? } pub fn set_inner_size(&self, x: u32, y: u32) { unsafe { (self.x.display.xlib.XResizeWindow)(self.x.display.display, self.x.window, x as libc::c_uint, y as libc::c_uint); } } pub fn create_window_proxy(&self) -> WindowProxy { WindowProxy { data: self.x.window_proxy_data.clone() } } pub fn poll_events(&self) -> PollEventsIterator { PollEventsIterator { window: self } } pub fn wait_events(&self) -> WaitEventsIterator { WaitEventsIterator { window: self } } pub fn platform_display(&self) -> *mut libc::c_void { self.x.display.display as *mut libc::c_void } pub fn platform_window(&self) -> *mut libc::c_void { self.x.window as *mut libc::c_void } pub fn set_window_resize_callback(&mut self, _: Option) { } pub fn set_cursor(&self, cursor: MouseCursor) { unsafe { use std::ffi::CString; let cursor_name = match cursor { MouseCursor::Alias => "link", MouseCursor::Arrow => "arrow", MouseCursor::Cell => "plus", MouseCursor::Copy => "copy", MouseCursor::Crosshair => "crosshair", MouseCursor::Default => "left_ptr", MouseCursor::Grabbing => "grabbing", MouseCursor::Hand | MouseCursor::Grab => "hand", MouseCursor::Help => "question_arrow", MouseCursor::Move => "move", MouseCursor::NoDrop => "circle", MouseCursor::NotAllowed => "crossed_circle", MouseCursor::Progress => "left_ptr_watch", /// Resize cursors MouseCursor::EResize => "right_side", MouseCursor::NResize => "top_side", MouseCursor::NeResize => "top_right_corner", MouseCursor::NwResize => "top_left_corner", MouseCursor::SResize => "bottom_side", MouseCursor::SeResize => "bottom_right_corner", MouseCursor::SwResize => "bottom_left_corner", MouseCursor::WResize => "left_side", MouseCursor::EwResize | MouseCursor::ColResize => "h_double_arrow", MouseCursor::NsResize | MouseCursor::RowResize => "v_double_arrow", MouseCursor::NwseResize => "bd_double_arrow", MouseCursor::NeswResize => "fd_double_arrow", MouseCursor::Text | MouseCursor::VerticalText => "xterm", MouseCursor::Wait => "watch", /// TODO: Find matching X11 cursors MouseCursor::ContextMenu | MouseCursor::NoneCursor | MouseCursor::AllScroll | MouseCursor::ZoomIn | MouseCursor::ZoomOut => "left_ptr", }; let c_string = CString::new(cursor_name.as_bytes().to_vec()).unwrap(); let xcursor = (self.x.display.xcursor.XcursorLibraryLoadCursor)(self.x.display.display, c_string.as_ptr()); (self.x.display.xlib.XDefineCursor)(self.x.display.display, self.x.window, xcursor); (self.x.display.xlib.XFlush)(self.x.display.display); } } pub fn set_cursor_state(&self, state: CursorState) -> Result<(), String> { use CursorState::{ Grab, Normal }; let mut cursor_state = self.cursor_state.lock().unwrap(); match (state, *cursor_state) { (Normal, Grab) => { unsafe { (self.x.display.xlib.XUngrabPointer)(self.x.display.display, ffi::CurrentTime); *cursor_state = Normal; Ok(()) } }, (Grab, Normal) => { unsafe { *cursor_state = Grab; match (self.x.display.xlib.XGrabPointer)( self.x.display.display, self.x.window, ffi::False, (ffi::ButtonPressMask | ffi::ButtonReleaseMask | ffi::EnterWindowMask | ffi::LeaveWindowMask | ffi::PointerMotionMask | ffi::PointerMotionHintMask | ffi::Button1MotionMask | ffi::Button2MotionMask | ffi::Button3MotionMask | ffi::Button4MotionMask | ffi::Button5MotionMask | ffi::ButtonMotionMask | ffi::KeymapStateMask) as libc::c_uint, ffi::GrabModeAsync, ffi::GrabModeAsync, self.x.window, 0, ffi::CurrentTime ) { ffi::GrabSuccess => Ok(()), ffi::AlreadyGrabbed | ffi::GrabInvalidTime | ffi::GrabNotViewable | ffi::GrabFrozen => Err("cursor could not be grabbed".to_string()), _ => unreachable!(), } } }, // Nothing needs to change (Grab, Grab) | (Normal, Normal) => Ok(()), _ => unimplemented!(), } } pub fn hidpi_factor(&self) -> f32 { 1.0 } pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> { unsafe { (self.x.display.xlib.XWarpPointer)(self.x.display.display, 0, self.x.window, 0, 0, 0, 0, x, y); } Ok(()) } } impl GlContext for Window { unsafe fn make_current(&self) -> Result<(), ContextError> { match self.x.context { Context::Glx(ref ctxt) => ctxt.make_current(), Context::Egl(ref ctxt) => ctxt.make_current(), Context::None => Ok(()) } } fn is_current(&self) -> bool { match self.x.context { Context::Glx(ref ctxt) => ctxt.is_current(), Context::Egl(ref ctxt) => ctxt.is_current(), Context::None => panic!() } } fn get_proc_address(&self, addr: &str) -> *const libc::c_void { match self.x.context { Context::Glx(ref ctxt) => ctxt.get_proc_address(addr), Context::Egl(ref ctxt) => ctxt.get_proc_address(addr), Context::None => ptr::null() } } fn swap_buffers(&self) -> Result<(), ContextError> { match self.x.context { Context::Glx(ref ctxt) => ctxt.swap_buffers(), Context::Egl(ref ctxt) => ctxt.swap_buffers(), Context::None => Ok(()) } } fn get_api(&self) -> Api { match self.x.context { Context::Glx(ref ctxt) => ctxt.get_api(), Context::Egl(ref ctxt) => ctxt.get_api(), Context::None => panic!() } } fn get_pixel_format(&self) -> PixelFormat { match self.x.context { Context::Glx(ref ctxt) => ctxt.get_pixel_format(), Context::Egl(ref ctxt) => ctxt.get_pixel_format(), Context::None => panic!() } } }