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Gergő Sályi 2023-04-07 17:25:48 +02:00
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[package]
name = "multibg-sway"
version = "0.1.0"
authors = ["Gergő Sályi <salyigergo94@gmail.com>"]
edition = "2021"
description = "Set a different wallpaper for the background of each Sway workspace"
license = "MIT OR Apache-2.0"
keywords = ["wallpaper", "background", "desktop", "wayland", "sway"]
categories = ["command-line-utilities", "multimedia::images"]
[dependencies]
clap = { version = "4.2.1", features = ["derive"] }
env_logger = "0.10.0"
image = "0.24.6"
log = "0.4.17"
mio = { version = "0.8.6", features = ["os-ext", "os-poll"] }
swayipc = "3.0.1"
[dependencies.smithay-client-toolkit]
git = "https://github.com/Smithay/client-toolkit.git"
rev = "389a4f21872a99a3ba346cc3dabd55c4079ec191" # master branch as of 2023-04-07

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Copyright 2023 Gergő Sályi
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the “Software”), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# multibg-sway
Set a different wallpaper for the background of each Sway workspace

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use clap::Parser;
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
pub struct Cli {
/// directory with: wallpaper_dir/output/workspace_name.{jpg|png|...}
pub wallpaper_dir: String,
}

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use std::{
fs::read_dir,
path::Path
};
use log::error;
use image::{ImageBuffer, Rgb, ImageError};
use smithay_client_toolkit::shm::slot::{Buffer, SlotPool};
use smithay_client_toolkit::reexports::client::protocol::wl_shm;
use crate::wayland::WorkspaceBackground;
pub fn workspace_bgs_from_output_image_dir(
dir_path: impl AsRef<Path>,
slot_pool: &mut SlotPool,
format: wl_shm::Format,
)
-> Result<Vec<WorkspaceBackground>, String>
{
let mut buffers = Vec::new();
let dir = read_dir(&dir_path)
.map_err(|e| format!("Failed to open directory: {}", e))?;
for entry_result in dir {
let entry = match entry_result {
Ok(entry) => entry,
Err(e) => {
error!(
"Skipping a directory entry in '{:?}' due to an error: {}",
dir_path.as_ref(), e
);
continue;
}
};
// Resolve symlinks
let path = match entry.path().canonicalize() {
Ok(file_type) => file_type,
Err(e) => {
error!(
"Skipping '{:?}' in '{:?}' due to an error: {}",
entry.path(), dir_path.as_ref(), e
);
continue;
}
};
// Skip dirs
if path.is_dir() { continue }
// Use the file stem as the name of the workspace for this wallpaper
let workspace_name = path.file_stem().unwrap()
.to_string_lossy().into_owned();
let raw_image = match image::io::Reader::open(&path)
.map_err(ImageError::IoError)
.and_then(|r| r.with_guessed_format()
.map_err(ImageError::IoError)
)
.and_then(|r| r.decode())
{
Ok(raw_image) => raw_image,
Err(e) => {
error!(
"Failed to open image '{:?}': {}",
path, e
);
continue;
}
};
let image = raw_image
// It is possible to adjust the contrast and brightness here
// .adjust_contrast(-25.0)
// .brighten(-60)
.into_rgb8();
let buffer = match format {
wl_shm::Format::Xrgb8888 =>
buffer_xrgb8888_from_image(image, slot_pool),
wl_shm::Format::Bgr888 =>
buffer_bgr888_from_image(image, slot_pool),
_ => unreachable!()
};
buffers.push(WorkspaceBackground { workspace_name, buffer });
}
if buffers.is_empty() {
Err("Found 0 suitable images in the directory".to_string())
}
else {
Ok(buffers)
}
}
fn buffer_xrgb8888_from_image(
image: ImageBuffer<Rgb<u8>, Vec<u8>>,
slot_pool: &mut SlotPool,
)
-> Buffer
{
let (buffer, canvas) = slot_pool
.create_buffer(
image.width() as i32,
image.height() as i32,
image.width() as i32 * 4,
wl_shm::Format::Xrgb8888
)
.unwrap();
let canvas_len = image.len() / 3 * 4;
let image_pixels = image.pixels();
let canvas_pixels = canvas[..canvas_len].chunks_exact_mut(4);
for (image_pixel, canvas_pixel) in image_pixels.zip(canvas_pixels) {
canvas_pixel[0] = image_pixel.0[2];
canvas_pixel[1] = image_pixel.0[1];
canvas_pixel[2] = image_pixel.0[0];
}
buffer
}
fn buffer_bgr888_from_image(
image: ImageBuffer<Rgb<u8>, Vec<u8>>,
slot_pool: &mut SlotPool,
)
-> Buffer
{
let (buffer, canvas) = slot_pool
.create_buffer(
image.width() as i32,
image.height() as i32,
image.width() as i32 * 3,
wl_shm::Format::Bgr888
)
.unwrap();
canvas[..image.len()].copy_from_slice(&image);
buffer
}

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mod cli;
mod image;
mod sway;
mod wayland;
use std::{
io,
os::fd::AsRawFd,
path::Path,
sync::{
Arc,
mpsc::{channel, Receiver},
}
};
use clap::Parser;
use log::error;
use mio::{
Events, Interest, Poll, Token, Waker,
unix::SourceFd,
};
use smithay_client_toolkit::{
compositor::CompositorState,
output::OutputState,
registry::RegistryState,
shell::wlr_layer::LayerShell,
shm::{Shm, slot::SlotPool},
};
use smithay_client_toolkit::reexports::client::{
Connection, EventQueue,
backend::{ReadEventsGuard, WaylandError},
globals::registry_queue_init,
};
use crate::{
cli::Cli,
sway::{SwayConnectionTask, WorkspaceVisible},
wayland::State,
};
fn main()
{
#[cfg(debug_assertions)]
env_logger::Builder::from_env(
env_logger::Env::default().default_filter_or(
"warn,multibg_sway=trace"
)
).init();
#[cfg(not(debug_assertions))]
env_logger::Builder::from_env(
env_logger::Env::default().default_filter_or("warn")
).init();
let cli = Cli::parse();
let wallpaper_dir = Path::new(&cli.wallpaper_dir).canonicalize().unwrap();
// ********************************
// Initialize wayland client
// ********************************
let conn = Connection::connect_to_env().unwrap();
let (globals, mut event_queue) = registry_queue_init(&conn).unwrap();
let qh = event_queue.handle();
let compositor_state = CompositorState::bind(&globals, &qh).unwrap();
let layer_shell = LayerShell::bind(&globals, &qh).unwrap();
let shm = Shm::bind(&globals, &qh).unwrap();
// Initialize slot pool with a minimum size (0 is not allowed)
// it will be automatically resized later
let shm_slot_pool = SlotPool::new(1, &shm).unwrap();
// Sync tools for sway ipc tasks
let mut poll = Poll::new().unwrap();
let waker = Arc::new(Waker::new(poll.registry(), SWAY).unwrap());
let (tx, rx) = channel();
let mut state = State {
compositor_state,
registry_state: RegistryState::new(&globals),
output_state: OutputState::new(&globals, &qh),
shm,
shm_slot_pool,
layer_shell,
wallpaper_dir,
pixel_format: None,
background_layers: Vec::new(),
sway_connection_task: SwayConnectionTask::new(
tx.clone(), Arc::clone(&waker)
),
};
event_queue.roundtrip(&mut state).unwrap();
// ********************************
// Main event loop
// ********************************
let mut events = Events::with_capacity(16);
const WAYLAND: Token = Token(0);
let read_guard = event_queue.prepare_read().unwrap();
let wayland_socket_fd = read_guard.connection_fd().as_raw_fd();
poll.registry().register(
&mut SourceFd(&wayland_socket_fd),
WAYLAND,
Interest::READABLE
).unwrap();
drop(read_guard);
const SWAY: Token = Token(1);
SwayConnectionTask::new(tx, waker).spawn_subscribe_event_loop();
loop {
event_queue.flush().unwrap();
event_queue.dispatch_pending(&mut state).unwrap();
let mut read_guard_option = Some(event_queue.prepare_read().unwrap());
poll.poll(&mut events, None).unwrap();
for event in events.iter() {
match event.token() {
WAYLAND => handle_wayland_event(
&mut state,
&mut read_guard_option,
&mut event_queue
),
SWAY => handle_sway_event(&mut state, &rx),
_ => unreachable!()
}
}
}
}
fn handle_wayland_event(
state: &mut State,
read_guard_option: &mut Option<ReadEventsGuard>,
event_queue: &mut EventQueue<State>,
) {
if let Some(read_guard) = read_guard_option.take() {
if let Err(e) = read_guard.read() {
// WouldBlock is normal here because of epoll false wakeups
if let WaylandError::Io(ref io_err) = e {
if io_err.kind() == io::ErrorKind::WouldBlock {
return;
}
}
panic!("Failed to read Wayland events: {}", e)
}
if let Err(e) = event_queue.dispatch_pending(state) {
panic!("Failed to dispatch pending Wayland events: {}", e);
}
}
}
fn handle_sway_event(
state: &mut State,
rx: &Receiver<WorkspaceVisible>,
) {
while let Ok(workspace) = rx.try_recv()
{
// Find the background layer that of the output where the workspace is
if let Some(affected_bg_layer) = state.background_layers.iter_mut()
.find(|bg_layer| bg_layer.output_name == workspace.output)
{
affected_bg_layer.draw_workspace_bg(&workspace.workspace_name);
}
else {
error!(
"Workspace '{}' is on an unknown output '{}', known outputs were: {}",
workspace.workspace_name,
workspace.output,
state.background_layers.iter()
.map(|bg_layer| bg_layer.output_name.as_str())
.collect::<Vec<_>>().join(", ")
);
continue;
};
}
}

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use std::{
sync::{Arc, mpsc::Sender},
thread::spawn,
};
use mio::Waker;
use swayipc::{Connection, Event, EventType, WorkspaceChange};
#[derive(Debug)]
pub struct WorkspaceVisible {
pub output: String,
pub workspace_name: String
}
pub struct SwayConnectionTask {
sway_conn: Connection,
tx: Sender<WorkspaceVisible>,
waker: Arc<Waker>,
}
impl SwayConnectionTask
{
pub fn new(tx: Sender<WorkspaceVisible>, waker: Arc<Waker>) -> Self {
SwayConnectionTask {
sway_conn: Connection::new()
.expect("Failed to connect to sway socket"),
tx,
waker
}
}
pub fn request_visible_workspace(&mut self, output: &str) {
if let Some(workspace) = self.sway_conn.get_workspaces().unwrap()
.into_iter()
.filter(|w| w.visible)
.find(|w| w.output == output)
{
self.tx.send(WorkspaceVisible {
output: workspace.output,
workspace_name: workspace.name,
}).unwrap();
self.waker.wake().unwrap();
}
}
pub fn request_visible_workspaces(&mut self) {
for workspace in self.sway_conn.get_workspaces().unwrap()
.into_iter().filter(|w| w.visible)
{
self.tx.send(WorkspaceVisible {
output: workspace.output,
workspace_name: workspace.name,
}).unwrap();
}
self.waker.wake().unwrap();
}
pub fn spawn_subscribe_event_loop(self) {
spawn(|| self.subscribe_event_loop());
}
fn subscribe_event_loop(self) {
let event_stream = self.sway_conn.subscribe([EventType::Workspace])
.unwrap();
for event_result in event_stream {
let event = event_result.unwrap();
let Event::Workspace(workspace_event) = event else {continue};
if let WorkspaceChange::Focus = workspace_event.change {
let current_workspace = workspace_event.current.unwrap();
self.tx.send(WorkspaceVisible {
output: current_workspace.output.unwrap(),
workspace_name: current_workspace.name.unwrap(),
}).unwrap();
self.waker.wake().unwrap();
}
}
}
}
// pub fn spawn_sway_events_loop_task(tx: Sender<WorkspaceVisible>, waker: Waker)
// {
// spawn(|| sway_events_loop_task(tx, waker));
// }
//
// pub fn sway_events_loop_task(tx: Sender<WorkspaceVisible>, waker: Waker)
// {
// let mut sway_conn = Connection::new()
// .expect("Failed to connect to sway socket");
//
// // Send the initial workspaces
// for workspace in sway_conn.get_workspaces().unwrap().into_iter() {
// if workspace.visible {
// tx.send(WorkspaceVisible {
// output: workspace.output,
// workspace_name: workspace.name,
// }).unwrap();
// }
// }
// waker.wake().unwrap();
//
// // Event loop
// let event_stream = sway_conn.subscribe([EventType::Workspace]).unwrap();
// for event_result in event_stream {
// let event = event_result.unwrap();
// let Event::Workspace(workspace_event) = event else {continue};
// if let WorkspaceChange::Focus = workspace_event.change {
// let current_workspace = workspace_event.current.unwrap();
//
// tx.send(WorkspaceVisible {
// output: current_workspace.output.unwrap(),
// workspace_name: current_workspace.name.unwrap(),
// }).unwrap();
//
// waker.wake().unwrap();
// }
// }
// }

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use std::path::PathBuf;
use log::{debug, error};
use smithay_client_toolkit::{
delegate_compositor, delegate_layer, delegate_output, delegate_registry,
delegate_shm,
compositor::{CompositorHandler, CompositorState},
output::{OutputHandler, OutputState},
registry::{ProvidesRegistryState, RegistryState},
registry_handlers,
shell::{
WaylandSurface,
wlr_layer::{
KeyboardInteractivity, Layer, LayerShell,
LayerShellHandler, LayerSurface, LayerSurfaceConfigure,
},
},
shm::{
Shm, ShmHandler,
slot::{Buffer, SlotPool},
},
};
use smithay_client_toolkit::reexports::client::{
Connection, QueueHandle,
protocol::{wl_output, wl_shm, wl_surface},
};
use crate::{
image::workspace_bgs_from_output_image_dir,
sway::SwayConnectionTask,
};
pub struct State {
pub compositor_state: CompositorState,
pub registry_state: RegistryState,
pub output_state: OutputState,
pub shm: Shm,
pub shm_slot_pool: SlotPool,
pub layer_shell: LayerShell,
pub wallpaper_dir: PathBuf,
pub pixel_format: Option<wl_shm::Format>,
pub background_layers: Vec<BackgroundLayer>,
pub sway_connection_task: SwayConnectionTask,
}
impl State {
fn pixel_format(&mut self) -> wl_shm::Format {
*self.pixel_format.get_or_insert_with(|| {
// Consume less gpu memory by using Bgr888 if available,
// fall back to the always supported Xrgb8888 otherwise
for format in self.shm.formats() {
if let wl_shm::Format::Bgr888 = format {
debug!("Using pixel format: {:?}", format);
return *format
}
// XXX: One may add Rgb888 and HDR support here
}
debug!("Using default pixel format: Xrgb8888");
wl_shm::Format::Xrgb8888
})
}
}
impl CompositorHandler for State
{
fn scale_factor_changed(
&mut self,
_conn: &Connection,
_qh: &QueueHandle<Self>,
_surface: &wl_surface::WlSurface,
_new_factor: i32,
) {
}
fn frame(
&mut self,
_conn: &Connection,
_qh: &QueueHandle<Self>,
_surface: &wl_surface::WlSurface,
_time: u32,
) {
}
}
impl LayerShellHandler for State
{
fn closed(
&mut self,
_conn: &Connection,
_qh: &QueueHandle<Self>,
_layer: &LayerSurface
) {
}
fn configure(
&mut self,
_conn: &Connection,
_qh: &QueueHandle<Self>,
layer: &LayerSurface,
_configure: LayerSurfaceConfigure,
_serial: u32,
) {
// The new layer is ready: request all the visible workspace from sway,
// it will get picked up by the main event loop and be drawn from there
let bg_layer = self.background_layers.iter_mut()
.find(|bg_layer| &bg_layer.layer == layer).unwrap();
if !bg_layer.configured {
bg_layer.configured = true;
self.sway_connection_task
.request_visible_workspace(&bg_layer.output_name);
debug!(
"Background layer has been configured for output: {}",
bg_layer.output_name
);
}
}
}
impl OutputHandler for State {
fn output_state(&mut self) -> &mut OutputState {
&mut self.output_state
}
fn new_output(
&mut self,
_conn: &Connection,
qh: &QueueHandle<Self>,
output: wl_output::WlOutput,
) {
let Some(info) = self.output_state.info(&output)
else {
error!("New output has no output info, skipping");
return;
};
let Some(output_name) = info.name
else {
error!("New output has no name, skipping");
return;
};
let Some((width, height)) = info.modes.iter()
.find(|mode| mode.current)
.map(|mode| mode.dimensions)
else {
error!(
"New output '{}' has no current mode set, skipping",
output_name
);
return;
};
debug!(
"New output, name: {}, resolution: {}x{}",
output_name, width, height
);
let surface = self.compositor_state.create_surface(qh);
let layer = self.layer_shell.create_layer_surface(
qh,
surface,
Layer::Background,
layer_surface_name(&output_name),
Some(&output)
);
layer.set_exclusive_zone(-1); // Don't let the status bar push it around
layer.set_keyboard_interactivity(KeyboardInteractivity::None);
layer.set_size(width as u32, height as u32);
layer.commit();
let pixel_format = self.pixel_format();
let output_wallpaper_dir = self.wallpaper_dir.join(&output_name);
let workspace_backgrounds = match workspace_bgs_from_output_image_dir(
&output_wallpaper_dir,
&mut self.shm_slot_pool,
pixel_format
) {
Ok(workspace_bgs) => {
debug!(
"Loaded {} wallpapers on new output for workspaces: {}",
workspace_bgs.len(),
workspace_bgs.iter()
.map(|workspace_bg| workspace_bg.workspace_name.as_str())
.collect::<Vec<_>>().join(", ")
);
workspace_bgs
},
Err(e) => {
error!(
"Failed to get wallpapers for new output '{}' form '{:?}': {}",
output_name, output_wallpaper_dir, e
);
return;
}
};
self.background_layers.push(BackgroundLayer {
output_name,
width,
height,
layer,
configured: false,
workspace_backgrounds,
});
}
fn update_output(
&mut self,
_conn: &Connection,
_qh: &QueueHandle<Self>,
_output: wl_output::WlOutput,
) {
// This will only be needed if we implement scaling the wallpapers
// to the output resolution
//
// let Some(info) = self.output_state.info(&output)
// else {
// error!("Updated output has no output info, skipping");
// return;
// };
//
// let Some(name) = info.name
// else {
// error!("Updated output has no name, skipping");
// return;
// };
//
// let Some((width, height)) = info.modes.iter()
// .find(|mode| mode.current)
// .map(|mode| mode.dimensions)
// else {
// error!(
// "Updated output '{}' has no current mode set, skipping",
// name
// );
// return;
// };
//
// if let Some(bg_layer) = self.background_layers.iter()
// .find(|bg_layers| bg_layers.output_name == name)
// {
// if bg_layer.width == width && bg_layer.height == height {
// // if a known output has its resolution unchanged
// // then ignore this event
// return;
// }
// }
//
// // renew the output otherwise
// self.output_destroyed(conn, qh, output.clone());
// self.new_output(conn, qh, output)
}
fn output_destroyed(
&mut self,
_conn: &Connection,
_qh: &QueueHandle<Self>,
output: wl_output::WlOutput,
) {
let Some(info) = self.output_state.info(&output)
else {
error!("Destroyed output has no output info, skipping");
return;
};
let Some(name) = info.name
else {
error!("Destroyed output has no name, skipping");
return;
};
if let Some(bg_layer_index) = self.background_layers.iter()
.position(|bg_layers| bg_layers.output_name == name)
{
self.background_layers.swap_remove(bg_layer_index);
// Workspaces on the destroyed output may have been moved anywhere
// so reset the wallpaper on all the visible workspaces
self.sway_connection_task.request_visible_workspaces();
debug!("Destroyed output: {}", name);
}
else {
error!(
"Ignoring destroyed output with unknown name '{}', known outputs were: {}",
name,
self.background_layers.iter()
.map(|bg_layer| bg_layer.output_name.as_str())
.collect::<Vec<_>>().join(", ")
);
}
}
}
impl ProvidesRegistryState for State {
fn registry(&mut self) -> &mut RegistryState {
&mut self.registry_state
}
registry_handlers![OutputState];
}
impl ShmHandler for State {
fn shm_state(&mut self) -> &mut Shm {
&mut self.shm
}
}
delegate_compositor!(State);
delegate_layer!(State);
delegate_output!(State);
delegate_registry!(State);
delegate_shm!(State);
pub struct BackgroundLayer {
pub output_name: String,
pub width: i32,
pub height: i32,
pub layer: LayerSurface,
pub configured: bool,
pub workspace_backgrounds: Vec<WorkspaceBackground>,
}
impl BackgroundLayer
{
pub fn draw_workspace_bg(&mut self, workspace_name: &str)
{
if !self.configured {
error!(
"Cannot draw wallpaper image on the not yet configured layer for output: {}",
self.output_name
);
return;
}
let Some(workspace_bg) = self.workspace_backgrounds.iter()
.find(|workspace_bg| workspace_bg.workspace_name == workspace_name)
else {
error!(
"There is no wallpaper image on output '{}' for workspace '{}', only for: {}",
self.output_name,
workspace_name,
self.workspace_backgrounds.iter()
.map(|workspace_bg| workspace_bg.workspace_name.as_str())
.collect::<Vec<_>>().join(", ")
);
return;
};
// Attach and commit to new workspace background
if let Err(e) = workspace_bg.buffer.attach_to(self.layer.wl_surface()) {
error!(
"Error attaching buffer of workspace '{}' on output '{}': {:#?}",
workspace_name,
self.output_name,
e
);
return;
}
// Damage the entire surface
self.layer.wl_surface().damage_buffer(0, 0, self.width, self.height);
self.layer.commit();
debug!(
"Setting wallpaper on output '{}' for workspace: {}",
self.output_name, workspace_name
);
}
}
pub struct WorkspaceBackground {
pub workspace_name: String,
pub buffer: Buffer,
}
fn layer_surface_name(output_name: &str) -> Option<String> {
Some([env!("CARGO_PKG_NAME"), "_wallpaper_", output_name].concat())
}