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//! Types and functions related to graphical outputs
//!
//! This modules provides two main elements. The first is the
//! [`OutputHandler`](struct.OutputHandler.html) type, which is a
//! [`MultiGlobalHandler`](../environment/trait.MultiGlobalHandler.html) for
//! use with the [`init_environment!`](../macro.init_environment.html) macro. It is automatically
//! included if you use the [`new_default_environment!`](../macro.new_default_environment.html).
//!
//! The second is the [`with_output_info`](fn.with_output_info.html) with allows you to
//! access the information associated to this output, as an [`OutputInfo`](struct.OutputInfo.html).
use std::{
cell::RefCell,
fmt,
rc::{self, Rc},
sync::{self, Arc, Mutex},
};
use wayland_client::{
protocol::{
wl_output::{self, Event, WlOutput},
wl_registry,
},
Attached, DispatchData, Main,
};
use wayland_protocols::unstable::xdg_output::v1::client::{
zxdg_output_manager_v1::ZxdgOutputManagerV1,
zxdg_output_v1::{self, ZxdgOutputV1},
};
pub use wayland_client::protocol::wl_output::{Subpixel, Transform};
/// A possible mode for an output
#[derive(Copy, Clone, Debug)]
pub struct Mode {
/// Number of pixels of this mode in format `(width, height)`
///
/// for example `(1920, 1080)`
pub dimensions: (i32, i32),
/// Refresh rate for this mode, in mHz
pub refresh_rate: i32,
/// Whether this is the current mode for this output
pub is_current: bool,
/// Whether this is the preferred mode for this output
pub is_preferred: bool,
}
#[derive(Clone, Debug)]
#[non_exhaustive]
/// Compiled information about an output
pub struct OutputInfo {
/// The ID of this output as a global
pub id: u32,
/// The model name of this output as advertised by the server
pub model: String,
/// The make name of this output as advertised by the server
pub make: String,
/// The name of this output as advertised by the server
///
/// Each name is unique among all wl_output globals, but if a wl_output
/// global is destroyed the same name may be reused later. The names will
/// also remain consistent across sessions with the same hardware and
/// software configuration.
///
/// Examples of names include 'HDMI-A-1', 'WL-1', 'X11-1', etc. However, do
/// not assume that the name is a reflection of an underlying DRM connector,
/// X11 connection, etc.
///
/// Note that this is not filled in by version 3 of the wl_output protocol,
/// but it has been proposed for inclusion in version 4. Until then, it is
/// only filled in if your environment has an [XdgOutputHandler] global
/// handler for [ZxdgOutputManagerV1].
pub name: String,
/// The description of this output as advertised by the server
///
/// The description is a UTF-8 string with no convention defined for its
/// contents. The description is not guaranteed to be unique among all
/// wl_output globals. Examples might include 'Foocorp 11" Display' or
/// 'Virtual X11 output via :1'.
///
/// Note that this is not filled in by version 3 of the wl_output protocol,
/// but it has been proposed for inclusion in version 4. Until then, it is
/// only filled in if your environment has an [XdgOutputHandler] global
/// handler for [ZxdgOutputManagerV1].
pub description: String,
/// Location of the top-left corner of this output in compositor
/// space
///
/// Note that the compositor may decide to always report (0,0) if
/// it decides clients are not allowed to know this information.
pub location: (i32, i32),
/// Physical dimensions of this output, in unspecified units
pub physical_size: (i32, i32),
/// The subpixel layout for this output
pub subpixel: Subpixel,
/// The current transformation applied to this output
///
/// You can pre-render your buffers taking this information
/// into account and advertising it via `wl_buffer.set_tranform`
/// for better performances.
pub transform: Transform,
/// The scaling factor of this output
///
/// Any buffer whose scaling factor does not match the one
/// of the output it is displayed on will be rescaled accordingly.
///
/// For example, a buffer of scaling factor 1 will be doubled in
/// size if the output scaling factor is 2.
pub scale_factor: i32,
/// Possible modes for an output
pub modes: Vec<Mode>,
/// Has this output been unadvertized by the registry
///
/// If this is the case, it has become inert, you might want to
/// call its `release()` method if you don't plan to use it any
/// longer.
pub obsolete: bool,
}
impl OutputInfo {
fn new(id: u32) -> OutputInfo {
OutputInfo {
id,
model: String::new(),
make: String::new(),
name: String::new(),
description: String::new(),
location: (0, 0),
physical_size: (0, 0),
subpixel: Subpixel::Unknown,
transform: Transform::Normal,
scale_factor: 1,
modes: Vec::new(),
obsolete: false,
}
}
}
type OutputCallback = dyn Fn(WlOutput, &OutputInfo, DispatchData) + Send + Sync;
enum OutputData {
Ready {
info: OutputInfo,
callbacks: Vec<sync::Weak<OutputCallback>>,
},
Pending {
id: u32,
has_xdg: bool,
events: Vec<Event>,
callbacks: Vec<sync::Weak<OutputCallback>>,
},
PendingXDG {
info: OutputInfo,
callbacks: Vec<sync::Weak<OutputCallback>>,
},
}
type OutputStatusCallback = dyn FnMut(WlOutput, &OutputInfo, DispatchData) + 'static;
/// A handler for `wl_output`
///
/// This handler can be used for managing `wl_output` in the
/// [`init_environment!`](../macro.init_environment.html) macro, and is automatically
/// included in [`new_default_environment!`](../macro.new_default_environment.html).
///
/// It aggregates the output information and makes it available via the
/// [`with_output_info`](fn.with_output_info.html) function.
pub struct OutputHandler {
outputs: Vec<(u32, Attached<WlOutput>)>,
status_listeners: Rc<RefCell<Vec<rc::Weak<RefCell<OutputStatusCallback>>>>>,
xdg_listener: Option<rc::Weak<RefCell<XdgOutputHandlerInner>>>,
}
impl OutputHandler {
/// Create a new instance of this handler
pub fn new() -> OutputHandler {
OutputHandler {
outputs: Vec::new(),
status_listeners: Rc::new(RefCell::new(Vec::new())),
xdg_listener: None,
}
}
}
impl crate::environment::MultiGlobalHandler<WlOutput> for OutputHandler {
fn created(
&mut self,
registry: Attached<wl_registry::WlRegistry>,
id: u32,
version: u32,
_: DispatchData,
) {
// We currently support wl_output up to version 4
let version = std::cmp::min(version, 4);
let output = registry.bind::<WlOutput>(version, id);
let has_xdg = if let Some(xdg) = self.xdg_listener.as_ref().and_then(rc::Weak::upgrade) {
xdg.borrow_mut().new_xdg_output(&output, &self.status_listeners)
} else {
false
};
if version > 1 {
// wl_output.done event was only added at version 2
// In case of an old version 1, we just behave as if it was send at the start
output.as_ref().user_data().set_threadsafe(|| {
Mutex::new(OutputData::Pending { id, has_xdg, events: vec![], callbacks: vec![] })
});
} else {
output.as_ref().user_data().set_threadsafe(|| {
Mutex::new(OutputData::Ready { info: OutputInfo::new(id), callbacks: vec![] })
});
}
let status_listeners_handle = self.status_listeners.clone();
let xdg_listener_handle = self.xdg_listener.clone();
output.quick_assign(move |output, event, ddata| {
process_output_event(
output,
event,
ddata,
&status_listeners_handle,
&xdg_listener_handle,
)
});
self.outputs.push((id, (*output).clone()));
}
fn removed(&mut self, id: u32, mut ddata: DispatchData) {
let status_listeners_handle = &self.status_listeners;
let xdg_listener_handle = &self.xdg_listener;
self.outputs.retain(|(i, o)| {
if *i != id {
true
} else {
make_obsolete(o, ddata.reborrow(), status_listeners_handle, xdg_listener_handle);
false
}
});
}
fn get_all(&self) -> Vec<Attached<WlOutput>> {
self.outputs.iter().map(|(_, o)| o.clone()).collect()
}
}
impl fmt::Debug for OutputHandler {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("OutputHandler")
.field("outputs", &self.outputs)
.field("status_listeners", &"Fn() -> { ... }")
.field("xdg_listener", &self.xdg_listener)
.finish()
}
}
fn process_output_event(
output: Main<WlOutput>,
event: Event,
mut ddata: DispatchData,
listeners: &Rc<RefCell<Vec<rc::Weak<RefCell<OutputStatusCallback>>>>>,
xdg_listener: &Option<rc::Weak<RefCell<XdgOutputHandlerInner>>>,
) {
let udata_mutex = output
.as_ref()
.user_data()
.get::<Mutex<OutputData>>()
.expect("SCTK: wl_output has invalid UserData");
let mut udata = udata_mutex.lock().unwrap();
if let Event::Done = event {
let (id, has_xdg, pending_events, mut callbacks) = match *udata {
OutputData::Pending { id, has_xdg, events: ref mut v, callbacks: ref mut cb } => {
(id, has_xdg, std::mem::take(v), std::mem::take(cb))
}
OutputData::PendingXDG { ref mut info, ref mut callbacks } => {
notify(&output, info, ddata.reborrow(), callbacks);
notify_status_listeners(&output, info, ddata, listeners);
let info = info.clone();
let callbacks = std::mem::take(callbacks);
*udata = OutputData::Ready { info, callbacks };
return;
}
OutputData::Ready { ref mut info, ref mut callbacks } => {
// a Done event on an output that is already ready was due to a
// status change (which was already merged)
notify(&output, info, ddata, callbacks);
return;
}
};
let mut info = OutputInfo::new(id);
for evt in pending_events {
merge_event(&mut info, evt);
}
notify(&output, &info, ddata.reborrow(), &mut callbacks);
if let Some(xdg) = xdg_listener.as_ref().and_then(rc::Weak::upgrade) {
if has_xdg || xdg.borrow_mut().new_xdg_output(&output, listeners) {
*udata = OutputData::PendingXDG { info, callbacks };
return;
}
}
notify_status_listeners(&output, &info, ddata, listeners);
*udata = OutputData::Ready { info, callbacks };
} else {
match *udata {
OutputData::Pending { events: ref mut v, .. } => v.push(event),
OutputData::PendingXDG { ref mut info, .. }
| OutputData::Ready { ref mut info, .. } => {
merge_event(info, event);
}
}
}
}
fn make_obsolete(
output: &Attached<WlOutput>,
mut ddata: DispatchData,
listeners: &RefCell<Vec<rc::Weak<RefCell<OutputStatusCallback>>>>,
xdg_listener: &Option<rc::Weak<RefCell<XdgOutputHandlerInner>>>,
) {
let udata_mutex = output
.as_ref()
.user_data()
.get::<Mutex<OutputData>>()
.expect("SCTK: wl_output has invalid UserData");
let mut udata = udata_mutex.lock().unwrap();
if let Some(xdg) = xdg_listener.as_ref().and_then(rc::Weak::upgrade) {
xdg.borrow_mut().destroy_xdg_output(output);
}
let (id, mut callbacks) = match *udata {
OutputData::PendingXDG { ref mut info, ref mut callbacks }
| OutputData::Ready { ref mut info, ref mut callbacks } => {
info.obsolete = true;
notify(output, info, ddata.reborrow(), callbacks);
notify_status_listeners(output, info, ddata, listeners);
return;
}
OutputData::Pending { id, callbacks: ref mut cb, .. } => (id, std::mem::take(cb)),
};
let mut info = OutputInfo::new(id);
info.obsolete = true;
notify(output, &info, ddata.reborrow(), &mut callbacks);
notify_status_listeners(output, &info, ddata, listeners);
*udata = OutputData::Ready { info, callbacks };
}
fn merge_event(info: &mut OutputInfo, event: Event) {
match event {
Event::Geometry {
x,
y,
physical_width,
physical_height,
subpixel,
model,
make,
transform,
} => {
info.location = (x, y);
info.physical_size = (physical_width, physical_height);
info.subpixel = subpixel;
info.transform = transform;
info.model = model;
info.make = make;
}
Event::Scale { factor } => {
info.scale_factor = factor;
}
Event::Mode { width, height, refresh, flags } => {
let mut found = false;
if let Some(mode) = info
.modes
.iter_mut()
.find(|m| m.dimensions == (width, height) && m.refresh_rate == refresh)
{
// this mode already exists, update it
mode.is_preferred = flags.contains(wl_output::Mode::Preferred);
mode.is_current = flags.contains(wl_output::Mode::Current);
found = true;
}
if !found {
// otherwise, add it
info.modes.push(Mode {
dimensions: (width, height),
refresh_rate: refresh,
is_preferred: flags.contains(wl_output::Mode::Preferred),
is_current: flags.contains(wl_output::Mode::Current),
})
}
}
Event::Name { name } => {
info.name = name;
}
Event::Description { description } => {
info.description = description;
}
// ignore all other events
_ => (),
}
}
fn notify(
output: &WlOutput,
info: &OutputInfo,
mut ddata: DispatchData,
callbacks: &mut Vec<sync::Weak<OutputCallback>>,
) {
callbacks.retain(|weak| {
if let Some(arc) = sync::Weak::upgrade(weak) {
(*arc)(output.clone(), info, ddata.reborrow());
true
} else {
false
}
});
}
fn notify_status_listeners(
output: &WlOutput,
info: &OutputInfo,
mut ddata: DispatchData,
listeners: &RefCell<Vec<rc::Weak<RefCell<OutputStatusCallback>>>>,
) {
// Notify the callbacks listening for new outputs
listeners.borrow_mut().retain(|lst| {
if let Some(cb) = rc::Weak::upgrade(lst) {
(cb.borrow_mut())(output.clone(), info, ddata.reborrow());
true
} else {
false
}
})
}
/// Access the info associated with this output
///
/// The provided closure is given the [`OutputInfo`](struct.OutputInfo.html) as argument,
/// and its return value is returned from this function.
///
/// If the provided `WlOutput` has not yet been initialized or is not managed by SCTK, `None` is returned.
///
/// If the output has been removed by the compositor, the `obsolete` field of the `OutputInfo`
/// will be set to `true`. This handler will not automatically detroy the output by calling its
/// `release` method, to avoid interfering with your logic.
pub fn with_output_info<T, F: FnOnce(&OutputInfo) -> T>(output: &WlOutput, f: F) -> Option<T> {
if let Some(udata_mutex) = output.as_ref().user_data().get::<Mutex<OutputData>>() {
let udata = udata_mutex.lock().unwrap();
match *udata {
OutputData::PendingXDG { ref info, .. } | OutputData::Ready { ref info, .. } => {
Some(f(info))
}
OutputData::Pending { .. } => None,
}
} else {
None
}
}
/// Add a listener to this output
///
/// The provided closure will be called whenever a property of the output changes,
/// including when it is removed by the compositor (in this case it'll be marked as
/// obsolete).
///
/// The returned [`OutputListener`](struct.OutputListener) keeps your callback alive,
/// dropping it will disable the callback and free the closure.
pub fn add_output_listener<F: Fn(WlOutput, &OutputInfo, DispatchData) + Send + Sync + 'static>(
output: &WlOutput,
f: F,
) -> OutputListener {
let arc = Arc::new(f) as Arc<_>;
if let Some(udata_mutex) = output.as_ref().user_data().get::<Mutex<OutputData>>() {
let mut udata = udata_mutex.lock().unwrap();
match *udata {
OutputData::Pending { ref mut callbacks, .. }
| OutputData::PendingXDG { ref mut callbacks, .. }
| OutputData::Ready { ref mut callbacks, .. } => {
callbacks.push(Arc::downgrade(&arc));
}
}
}
OutputListener { _cb: arc }
}
/// A handle to an output listener callback
///
/// Dropping it disables the associated callback and frees the closure.
pub struct OutputListener {
_cb: Arc<dyn Fn(WlOutput, &OutputInfo, DispatchData) + Send + Sync + 'static>,
}
impl fmt::Debug for OutputListener {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("OutputListener").field("_cb", &"fn() -> { ... }").finish()
}
}
/// A handle to an output status callback
///
/// Dropping it disables the associated callback and frees the closure.
pub struct OutputStatusListener {
_cb: Rc<RefCell<OutputStatusCallback>>,
}
impl fmt::Debug for OutputStatusListener {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("OutputStatusListener").field("_cb", &"fn() -> { ... }").finish()
}
}
/// Trait representing the OutputHandler functions
///
/// Implementing this trait on your inner environment struct used with the
/// [`environment!`](../macro.environment.html) by delegating it to its
/// [`OutputHandler`](struct.OutputHandler.html) field will make available the output-associated
/// method on your [`Environment`](../environment/struct.Environment.html).
pub trait OutputHandling {
/// Insert a listener for output creation and removal events
fn listen<F: FnMut(WlOutput, &OutputInfo, DispatchData) + 'static>(
&mut self,
f: F,
) -> OutputStatusListener;
}
impl OutputHandling for OutputHandler {
fn listen<F: FnMut(WlOutput, &OutputInfo, DispatchData) + 'static>(
&mut self,
f: F,
) -> OutputStatusListener {
let rc = Rc::new(RefCell::new(f)) as Rc<_>;
self.status_listeners.borrow_mut().push(Rc::downgrade(&rc));
OutputStatusListener { _cb: rc }
}
}
impl<E: OutputHandling> crate::environment::Environment<E> {
/// Insert a new listener for outputs
///
/// The provided closure will be invoked whenever a `wl_output` is created or removed.
///
/// Note that if outputs already exist when this callback is setup, it'll not be invoked on them.
/// For you to be notified of them as well, you need to first process them manually by calling
/// `.get_all_outputs()`.
///
/// The returned [`OutputStatusListener`](../output/struct.OutputStatusListener.hmtl) keeps your
/// callback alive, dropping it will disable it.
#[must_use = "the returned OutputStatusListener keeps your callback alive, dropping it will disable it"]
pub fn listen_for_outputs<F: FnMut(WlOutput, &OutputInfo, DispatchData) + 'static>(
&self,
f: F,
) -> OutputStatusListener {
self.with_inner(move |inner| OutputHandling::listen(inner, f))
}
}
impl<E: crate::environment::MultiGlobalHandler<WlOutput>> crate::environment::Environment<E> {
/// Shorthand method to retrieve the list of outputs
pub fn get_all_outputs(&self) -> Vec<WlOutput> {
self.get_all_globals::<WlOutput>().into_iter().map(|o| o.detach()).collect()
}
}
/// A handler for `zxdg_output_manager_v1`
///
/// This handler adds additional information to the OutputInfo struct that is
/// available through the xdg_output interface. Because this requires binding
/// the two handlers together when they are being created, it does not work with
/// [`new_default_environment!`](../macro.new_default_environment.html); you
/// must use [`default_environment!`](../macro.default_environment.html) and
/// create the [OutputHandler] outside the constructor.
///
/// ```no_compile
/// let (sctk_outputs, sctk_xdg_out) = smithay_client_toolkit::output::XdgOutputHandler::new_output_handlers();
///
/// let env = smithay_client_toolkit::environment::Environment::new(&wl_display, &mut wl_queue, Globals {
/// sctk_compositor: SimpleGlobal::new(),
/// sctk_shm: smithay_client_toolkit::shm::ShmHandler::new(),
/// sctk_seats : smithay_client_toolkit::seat::SeatHandler::new(),
/// sctk_shell : smithay_client_toolkit::shell::ShellHandler::new(),
/// sctk_outputs,
/// sctk_xdg_out,
/// // ...
/// })?;
///
/// ```
#[derive(Debug)]
pub struct XdgOutputHandler {
inner: Rc<RefCell<XdgOutputHandlerInner>>,
}
#[derive(Debug)]
struct XdgOutputHandlerInner {
xdg_manager: Option<Attached<ZxdgOutputManagerV1>>,
outputs: Vec<(WlOutput, Attached<ZxdgOutputV1>)>,
}
impl XdgOutputHandler {
/// Create a new instance of this handler bound to the given OutputHandler.
pub fn new(output_handler: &mut OutputHandler) -> Self {
let inner =
Rc::new(RefCell::new(XdgOutputHandlerInner { xdg_manager: None, outputs: Vec::new() }));
output_handler.xdg_listener = Some(Rc::downgrade(&inner));
XdgOutputHandler { inner }
}
/// Helper function to create a bound pair of OutputHandler and XdgOutputHandler.
pub fn new_output_handlers() -> (OutputHandler, Self) {
let mut oh = OutputHandler::new();
let xh = XdgOutputHandler::new(&mut oh);
(oh, xh)
}
}
impl XdgOutputHandlerInner {
fn new_xdg_output(
&mut self,
output: &WlOutput,
listeners: &Rc<RefCell<Vec<rc::Weak<RefCell<OutputStatusCallback>>>>>,
) -> bool {
if let Some(xdg_manager) = &self.xdg_manager {
let xdg_main = xdg_manager.get_xdg_output(output);
let wl_out = output.clone();
let listeners = listeners.clone();
xdg_main.quick_assign(move |_xdg_out, event, ddata| {
process_xdg_event(&wl_out, event, ddata, &listeners)
});
self.outputs.push((output.clone(), xdg_main.into()));
true
} else {
false
}
}
fn destroy_xdg_output(&mut self, output: &WlOutput) {
self.outputs.retain(|(out, xdg_out)| {
if out.as_ref().is_alive() && out != output {
true
} else {
xdg_out.destroy();
false
}
});
}
}
fn process_xdg_event(
wl_out: &WlOutput,
event: zxdg_output_v1::Event,
mut ddata: DispatchData,
listeners: &RefCell<Vec<rc::Weak<RefCell<OutputStatusCallback>>>>,
) {
use zxdg_output_v1::Event;
let udata_mutex = wl_out
.as_ref()
.user_data()
.get::<Mutex<OutputData>>()
.expect("SCTK: wl_output has invalid UserData");
let mut udata = udata_mutex.lock().unwrap();
let (info, callbacks, pending) = match &mut *udata {
OutputData::Ready { info, callbacks } => (info, callbacks, false),
OutputData::PendingXDG { info, callbacks } => (info, callbacks, true),
OutputData::Pending { .. } => unreachable!(),
};
match event {
Event::Name { name } => {
info.name = name;
}
Event::Description { description } => {
info.description = description;
}
Event::Done => {
notify(wl_out, info, ddata.reborrow(), callbacks);
if pending {
notify_status_listeners(wl_out, info, ddata, listeners);
let info = info.clone();
let callbacks = std::mem::take(callbacks);
*udata = OutputData::Ready { info, callbacks };
}
}
_ => (),
}
}
impl crate::environment::GlobalHandler<ZxdgOutputManagerV1> for XdgOutputHandler {
fn created(
&mut self,
registry: Attached<wl_registry::WlRegistry>,
id: u32,
version: u32,
_: DispatchData,
) {
let version = std::cmp::min(version, 3);
let mut inner = self.inner.borrow_mut();
let xdg_manager: Main<ZxdgOutputManagerV1> = registry.bind(version, id);
inner.xdg_manager = Some(xdg_manager.into());
}
fn get(&self) -> Option<Attached<ZxdgOutputManagerV1>> {
let inner = self.inner.borrow();
inner.xdg_manager.clone()
}
}