feat: initial project with CPU-rendered ring light overlay
Wayland layer-shell overlay using tiny-skia for rendering a glowing rounded rectangle ring. Includes PID-based lock file toggle via SIGUSR1, keyboard capture (Escape to exit), and pointer tracking for cursor avoidance. Configurable ring geometry and glow parameters.
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|
||||||
|
name = "zmij"
|
||||||
|
version = "1.0.21"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
|
||||||
+15
@@ -0,0 +1,15 @@
|
|||||||
|
[package]
|
||||||
|
name = "ringa"
|
||||||
|
version = "0.1.0"
|
||||||
|
edition = "2021"
|
||||||
|
description = "Wayland ring light overlay"
|
||||||
|
authors = ["Stephen Waits <steve@waits.net>"]
|
||||||
|
rust-version = "1.85"
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
anyhow = "1.0"
|
||||||
|
nix = { version = "0.29", features = ["signal", "process", "poll"] }
|
||||||
|
tempfile = "3"
|
||||||
|
tiny-skia = "0.12.0"
|
||||||
|
wayland-client = "0.31"
|
||||||
|
wayland-protocols-wlr = { version = "0.3", features = ["client"] }
|
||||||
+105
@@ -0,0 +1,105 @@
|
|||||||
|
//! PID-based lock file for toggle-on/toggle-off behavior.
|
||||||
|
//!
|
||||||
|
//! The first invocation creates a lock file and runs the overlay.
|
||||||
|
//! A second invocation sees the lock, sends SIGUSR1 to the running
|
||||||
|
//! instance, and exits immediately.
|
||||||
|
|
||||||
|
use std::fs;
|
||||||
|
use std::path::PathBuf;
|
||||||
|
use std::sync::atomic::{AtomicBool, Ordering};
|
||||||
|
|
||||||
|
use anyhow::{Context, Result};
|
||||||
|
use nix::sys::signal::{self, SaFlags, SigAction, SigHandler, SigSet, Signal};
|
||||||
|
use nix::unistd::Pid;
|
||||||
|
|
||||||
|
static SHOULD_EXIT: AtomicBool = AtomicBool::new(false);
|
||||||
|
|
||||||
|
extern "C" fn handle_sigusr1(_: nix::libc::c_int) {
|
||||||
|
SHOULD_EXIT.store(true, Ordering::Relaxed);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub enum ToggleResult {
|
||||||
|
RunNew,
|
||||||
|
SignaledExisting,
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Check if another instance is running and signal it, or indicate we should run.
|
||||||
|
pub fn try_toggle() -> Result<ToggleResult> {
|
||||||
|
let path = lock_file_path();
|
||||||
|
|
||||||
|
let contents = match fs::read_to_string(&path) {
|
||||||
|
Ok(c) => c,
|
||||||
|
Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Ok(ToggleResult::RunNew),
|
||||||
|
Err(e) => return Err(e).context("read lock file"),
|
||||||
|
};
|
||||||
|
|
||||||
|
let pid: i32 = contents
|
||||||
|
.trim()
|
||||||
|
.parse()
|
||||||
|
.context("parse PID from lock file")?;
|
||||||
|
let pid = Pid::from_raw(pid);
|
||||||
|
|
||||||
|
// Check if the process is alive.
|
||||||
|
match signal::kill(pid, None) {
|
||||||
|
Ok(()) => {}
|
||||||
|
Err(nix::errno::Errno::ESRCH) => {
|
||||||
|
// Stale lock — process is gone.
|
||||||
|
let _ = fs::remove_file(&path);
|
||||||
|
return Ok(ToggleResult::RunNew);
|
||||||
|
}
|
||||||
|
Err(e) => return Err(e).context("check if PID is alive"),
|
||||||
|
}
|
||||||
|
|
||||||
|
// Process is alive — send SIGUSR1 to tell it to exit.
|
||||||
|
match signal::kill(pid, Signal::SIGUSR1) {
|
||||||
|
Ok(()) => Ok(ToggleResult::SignaledExisting),
|
||||||
|
Err(nix::errno::Errno::ESRCH) => {
|
||||||
|
// Raced — process died between check and signal.
|
||||||
|
let _ = fs::remove_file(&path);
|
||||||
|
Ok(ToggleResult::RunNew)
|
||||||
|
}
|
||||||
|
Err(e) => Err(e).context("send SIGUSR1"),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns true if SIGUSR1 has been received.
|
||||||
|
pub fn should_exit() -> bool {
|
||||||
|
SHOULD_EXIT.load(Ordering::Relaxed)
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Create the lock file and install the SIGUSR1 handler. Returns a guard
|
||||||
|
/// that removes the lock file on drop.
|
||||||
|
pub fn create_lock() -> Result<LockGuard> {
|
||||||
|
let path = lock_file_path();
|
||||||
|
|
||||||
|
// Install SIGUSR1 handler before writing the lock file.
|
||||||
|
let action = SigAction::new(
|
||||||
|
SigHandler::Handler(handle_sigusr1),
|
||||||
|
SaFlags::SA_RESTART,
|
||||||
|
SigSet::empty(),
|
||||||
|
);
|
||||||
|
unsafe { signal::sigaction(Signal::SIGUSR1, &action) }.context("install SIGUSR1 handler")?;
|
||||||
|
|
||||||
|
let pid = std::process::id();
|
||||||
|
fs::write(&path, pid.to_string()).context("write lock file")?;
|
||||||
|
|
||||||
|
Ok(LockGuard { path })
|
||||||
|
}
|
||||||
|
|
||||||
|
pub struct LockGuard {
|
||||||
|
path: PathBuf,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Drop for LockGuard {
|
||||||
|
fn drop(&mut self) {
|
||||||
|
let _ = fs::remove_file(&self.path);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn lock_file_path() -> PathBuf {
|
||||||
|
if let Ok(dir) = std::env::var("XDG_RUNTIME_DIR") {
|
||||||
|
PathBuf::from(dir).join("ringa.lock")
|
||||||
|
} else {
|
||||||
|
PathBuf::from("/tmp/ringa.lock")
|
||||||
|
}
|
||||||
|
}
|
||||||
+74
@@ -0,0 +1,74 @@
|
|||||||
|
mod lock;
|
||||||
|
mod render;
|
||||||
|
mod wayland;
|
||||||
|
|
||||||
|
use std::time::{Duration, Instant};
|
||||||
|
|
||||||
|
use anyhow::{Context, Result};
|
||||||
|
use tiny_skia::Pixmap;
|
||||||
|
|
||||||
|
use lock::ToggleResult;
|
||||||
|
use wayland::{OverlayEvent, WaylandBackend};
|
||||||
|
|
||||||
|
const DISPLAY_DURATION: Duration = Duration::from_secs(5);
|
||||||
|
|
||||||
|
fn main() -> Result<()> {
|
||||||
|
match lock::try_toggle()? {
|
||||||
|
ToggleResult::SignaledExisting => return Ok(()),
|
||||||
|
ToggleResult::RunNew => {}
|
||||||
|
}
|
||||||
|
|
||||||
|
let _lock = lock::create_lock()?;
|
||||||
|
|
||||||
|
let mut wl = WaylandBackend::new()?;
|
||||||
|
let (w, h) = wl.screen_size();
|
||||||
|
let mut pixmap = Pixmap::new(w, h).context("create pixmap")?;
|
||||||
|
let mut argb_buf = vec![0u8; (w as usize) * (h as usize) * 4];
|
||||||
|
|
||||||
|
let mut cursor_x = w as f64 / 2.0;
|
||||||
|
let mut cursor_y = h as f64 / 2.0;
|
||||||
|
|
||||||
|
draw(&mut wl, &mut pixmap, &mut argb_buf, cursor_x, cursor_y)?;
|
||||||
|
|
||||||
|
let start = Instant::now();
|
||||||
|
|
||||||
|
loop {
|
||||||
|
let elapsed = start.elapsed();
|
||||||
|
if elapsed >= DISPLAY_DURATION || lock::should_exit() {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
let remaining = DISPLAY_DURATION - elapsed;
|
||||||
|
let event = match wl.next_event(remaining)? {
|
||||||
|
Some(ev) => ev,
|
||||||
|
None => continue, // poll timeout — loop back to check elapsed time
|
||||||
|
};
|
||||||
|
match event {
|
||||||
|
OverlayEvent::Close => break,
|
||||||
|
OverlayEvent::CursorMoved(x, y) => {
|
||||||
|
cursor_x = x;
|
||||||
|
cursor_y = y;
|
||||||
|
draw(&mut wl, &mut pixmap, &mut argb_buf, cursor_x, cursor_y)?;
|
||||||
|
}
|
||||||
|
OverlayEvent::Configure(new_w, new_h) => {
|
||||||
|
if new_w != w || new_h != h {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn draw(
|
||||||
|
wl: &mut WaylandBackend,
|
||||||
|
pixmap: &mut Pixmap,
|
||||||
|
argb_buf: &mut [u8],
|
||||||
|
cursor_x: f64,
|
||||||
|
cursor_y: f64,
|
||||||
|
) -> Result<()> {
|
||||||
|
render::render_ring_light(pixmap, cursor_x, cursor_y);
|
||||||
|
render::pixmap_to_argb8888(pixmap, argb_buf);
|
||||||
|
let (w, h) = wl.screen_size();
|
||||||
|
wl.present(argb_buf, w, h)
|
||||||
|
}
|
||||||
+183
@@ -0,0 +1,183 @@
|
|||||||
|
//! Ring light glow rendering.
|
||||||
|
//!
|
||||||
|
//! The ring is a thick stroke centered on a single rounded rectangle SDF.
|
||||||
|
//! This guarantees uniform width everywhere, including at corners.
|
||||||
|
//! Glow bleeds outward and inward from the stroke edges.
|
||||||
|
|
||||||
|
use tiny_skia::Pixmap;
|
||||||
|
|
||||||
|
// The rounded rect centerline is inset this far from the screen edge.
|
||||||
|
// The visible ring extends RING_HALF_WIDTH on either side of this line.
|
||||||
|
const CENTERLINE_INSET: f32 = 80.0;
|
||||||
|
// Half the stroke width. Total ring thickness = 2 * RING_HALF_WIDTH.
|
||||||
|
const RING_HALF_WIDTH: f32 = 30.0;
|
||||||
|
// Corner radius of the centerline rounded rect.
|
||||||
|
const CORNER_RADIUS: f32 = 30.0;
|
||||||
|
|
||||||
|
// Soft glow spread outward and inward from the ring edges.
|
||||||
|
const GLOW_SPREAD: f32 = 50.0;
|
||||||
|
const RING_ALPHA: f32 = 1.00;
|
||||||
|
|
||||||
|
// Cursor avoidance.
|
||||||
|
const CURSOR_AVOID_RADIUS: f32 = 120.0;
|
||||||
|
const CURSOR_AVOID_FALLOFF: f32 = 60.0;
|
||||||
|
|
||||||
|
/// Render the ring light glow into `pixmap`, avoiding the cursor at `(cx, cy)`.
|
||||||
|
pub fn render_ring_light(pixmap: &mut Pixmap, cx: f64, cy: f64) {
|
||||||
|
let w = pixmap.width() as f32;
|
||||||
|
let h = pixmap.height() as f32;
|
||||||
|
let cx = cx as f32;
|
||||||
|
let cy = cy as f32;
|
||||||
|
let wi = pixmap.width() as usize;
|
||||||
|
let hi = pixmap.height() as usize;
|
||||||
|
|
||||||
|
let data = pixmap.data_mut();
|
||||||
|
data.fill(0);
|
||||||
|
|
||||||
|
let screen_cx = w / 2.0;
|
||||||
|
let screen_cy = h / 2.0;
|
||||||
|
|
||||||
|
// Single rounded rect centerline.
|
||||||
|
let hw = w / 2.0 - CENTERLINE_INSET;
|
||||||
|
let hh = h / 2.0 - CENTERLINE_INSET;
|
||||||
|
|
||||||
|
// The affected band: from (CENTERLINE_INSET - RING_HALF_WIDTH - GLOW_SPREAD)
|
||||||
|
// to (CENTERLINE_INSET + RING_HALF_WIDTH + GLOW_SPREAD) from each screen edge.
|
||||||
|
let band_start = (CENTERLINE_INSET - RING_HALF_WIDTH - GLOW_SPREAD)
|
||||||
|
.max(0.0)
|
||||||
|
.floor() as usize;
|
||||||
|
let band_end = (CENTERLINE_INSET + RING_HALF_WIDTH + GLOW_SPREAD).ceil() as usize + 1;
|
||||||
|
|
||||||
|
// Top band
|
||||||
|
for py in band_start..band_end.min(hi) {
|
||||||
|
for px in 0..wi {
|
||||||
|
let a = pixel_alpha(px as f32, py as f32, screen_cx, screen_cy, hw, hh, cx, cy);
|
||||||
|
write_pixel(data, py * wi + px, a);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Bottom band
|
||||||
|
let bottom_start = hi.saturating_sub(band_end);
|
||||||
|
let bottom_end = hi.saturating_sub(band_start);
|
||||||
|
for py in bottom_start..bottom_end.min(hi) {
|
||||||
|
if py < band_end {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
for px in 0..wi {
|
||||||
|
let a = pixel_alpha(px as f32, py as f32, screen_cx, screen_cy, hw, hh, cx, cy);
|
||||||
|
write_pixel(data, py * wi + px, a);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Left band (between top and bottom)
|
||||||
|
let vert_start = band_end.min(hi);
|
||||||
|
let vert_end = hi.saturating_sub(band_end);
|
||||||
|
for py in vert_start..vert_end {
|
||||||
|
for px in band_start..band_end.min(wi) {
|
||||||
|
let a = pixel_alpha(px as f32, py as f32, screen_cx, screen_cy, hw, hh, cx, cy);
|
||||||
|
write_pixel(data, py * wi + px, a);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Right band (between top and bottom)
|
||||||
|
let right_start = wi.saturating_sub(band_end);
|
||||||
|
let right_end = wi.saturating_sub(band_start);
|
||||||
|
for py in vert_start..vert_end {
|
||||||
|
for px in right_start..right_end.min(wi) {
|
||||||
|
if px < band_end {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
let a = pixel_alpha(px as f32, py as f32, screen_cx, screen_cy, hw, hh, cx, cy);
|
||||||
|
write_pixel(data, py * wi + px, a);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Convert a tiny-skia `Pixmap` (premultiplied RGBA) to Wayland's ARGB8888
|
||||||
|
/// format (premultiplied BGRA in memory on little-endian).
|
||||||
|
pub fn pixmap_to_argb8888(pixmap: &Pixmap, out: &mut [u8]) {
|
||||||
|
let src = pixmap.data();
|
||||||
|
assert_eq!(out.len(), src.len());
|
||||||
|
for (dst, src) in out.chunks_exact_mut(4).zip(src.chunks_exact(4)) {
|
||||||
|
dst[0] = src[2]; // B
|
||||||
|
dst[1] = src[1]; // G
|
||||||
|
dst[2] = src[0]; // R
|
||||||
|
dst[3] = src[3]; // A
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// ---- Private helpers --------------------------------------------------------
|
||||||
|
|
||||||
|
/// Compute glow alpha for a single pixel using a single rounded rect SDF.
|
||||||
|
///
|
||||||
|
/// The ring is all pixels where |sdf| <= RING_HALF_WIDTH (a thick stroke).
|
||||||
|
/// Glow fades from the ring edges outward/inward over GLOW_SPREAD pixels.
|
||||||
|
#[allow(clippy::too_many_arguments)]
|
||||||
|
fn pixel_alpha(
|
||||||
|
px: f32,
|
||||||
|
py: f32,
|
||||||
|
scx: f32,
|
||||||
|
scy: f32,
|
||||||
|
hw: f32,
|
||||||
|
hh: f32,
|
||||||
|
cursor_x: f32,
|
||||||
|
cursor_y: f32,
|
||||||
|
) -> u8 {
|
||||||
|
// Signed distance to the rounded rect centerline.
|
||||||
|
let sd = rounded_rect_sdf(px, py, scx, scy, hw, hh, CORNER_RADIUS);
|
||||||
|
let abs_sd = sd.abs();
|
||||||
|
|
||||||
|
let glow = if abs_sd <= RING_HALF_WIDTH {
|
||||||
|
// Inside the ring stroke — full brightness.
|
||||||
|
RING_ALPHA
|
||||||
|
} else {
|
||||||
|
// Distance from the nearest ring edge.
|
||||||
|
let dist = abs_sd - RING_HALF_WIDTH;
|
||||||
|
if dist >= GLOW_SPREAD {
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
let t = dist / GLOW_SPREAD;
|
||||||
|
smoothstep(1.0 - t) * RING_ALPHA
|
||||||
|
};
|
||||||
|
|
||||||
|
// Cursor avoidance.
|
||||||
|
let dx = px - cursor_x;
|
||||||
|
let dy = py - cursor_y;
|
||||||
|
let cursor_dist = (dx * dx + dy * dy).sqrt();
|
||||||
|
let cursor_factor =
|
||||||
|
smoothstep(((cursor_dist - CURSOR_AVOID_RADIUS) / CURSOR_AVOID_FALLOFF).clamp(0.0, 1.0));
|
||||||
|
|
||||||
|
let alpha = glow * cursor_factor;
|
||||||
|
(alpha * 255.0) as u8
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Signed distance field for a rounded rectangle.
|
||||||
|
///
|
||||||
|
/// Returns negative inside, positive outside, zero on the boundary.
|
||||||
|
fn rounded_rect_sdf(px: f32, py: f32, cx: f32, cy: f32, hw: f32, hh: f32, r: f32) -> f32 {
|
||||||
|
let dx = (px - cx).abs() - (hw - r);
|
||||||
|
let dy = (py - cy).abs() - (hh - r);
|
||||||
|
let outside = dx.max(0.0);
|
||||||
|
let outside_y = dy.max(0.0);
|
||||||
|
let outside_len = (outside * outside + outside_y * outside_y).sqrt();
|
||||||
|
let inside = dx.max(dy).min(0.0);
|
||||||
|
outside_len + inside - r
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Write a premultiplied white pixel with the given alpha.
|
||||||
|
fn write_pixel(data: &mut [u8], idx: usize, alpha: u8) {
|
||||||
|
if alpha == 0 {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
let offset = idx * 4;
|
||||||
|
data[offset] = alpha;
|
||||||
|
data[offset + 1] = alpha;
|
||||||
|
data[offset + 2] = alpha;
|
||||||
|
data[offset + 3] = alpha;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Hermite smoothstep: 3t^2 - 2t^3
|
||||||
|
fn smoothstep(t: f32) -> f32 {
|
||||||
|
let t = t.clamp(0.0, 1.0);
|
||||||
|
t * t * (3.0 - 2.0 * t)
|
||||||
|
}
|
||||||
+409
@@ -0,0 +1,409 @@
|
|||||||
|
//! Wayland backend: layer-shell overlay with keyboard and pointer tracking.
|
||||||
|
//!
|
||||||
|
//! Creates a full-screen layer-shell surface for the ring light overlay.
|
||||||
|
//! Tracks pointer position for cursor avoidance and captures keyboard
|
||||||
|
//! for Escape to exit.
|
||||||
|
|
||||||
|
use std::collections::VecDeque;
|
||||||
|
use std::io::Write;
|
||||||
|
use std::os::fd::AsFd;
|
||||||
|
use std::time::Duration;
|
||||||
|
|
||||||
|
use wayland_client::{
|
||||||
|
delegate_noop,
|
||||||
|
protocol::{
|
||||||
|
wl_buffer, wl_compositor, wl_keyboard, wl_pointer, wl_region, wl_registry, wl_seat,
|
||||||
|
wl_shm, wl_shm_pool, wl_surface,
|
||||||
|
},
|
||||||
|
Connection, Dispatch, EventQueue, QueueHandle, WEnum,
|
||||||
|
};
|
||||||
|
use wayland_protocols_wlr::layer_shell::v1::client::{zwlr_layer_shell_v1, zwlr_layer_surface_v1};
|
||||||
|
|
||||||
|
use anyhow::{Context, Result};
|
||||||
|
|
||||||
|
// Linux evdev key code for Escape.
|
||||||
|
const KEY_ESCAPE: u32 = 1;
|
||||||
|
|
||||||
|
/// Events emitted by the Wayland backend to the main loop.
|
||||||
|
pub enum OverlayEvent {
|
||||||
|
/// Escape pressed or surface closed by compositor.
|
||||||
|
Close,
|
||||||
|
/// Pointer moved to (x, y) in surface-local coordinates.
|
||||||
|
CursorMoved(f64, f64),
|
||||||
|
/// Surface (re-)configured with new dimensions.
|
||||||
|
Configure(u32, u32),
|
||||||
|
}
|
||||||
|
|
||||||
|
// ===========================================================================
|
||||||
|
// WaylandBackend — public API.
|
||||||
|
// ===========================================================================
|
||||||
|
|
||||||
|
pub struct WaylandBackend {
|
||||||
|
state: WaylandState,
|
||||||
|
event_queue: EventQueue<WaylandState>,
|
||||||
|
queue_handle: QueueHandle<WaylandState>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl WaylandBackend {
|
||||||
|
pub fn new() -> Result<Self> {
|
||||||
|
let conn = Connection::connect_to_env().context("connect to Wayland display")?;
|
||||||
|
let mut event_queue = conn.new_event_queue();
|
||||||
|
let queue_handle = event_queue.handle();
|
||||||
|
|
||||||
|
conn.display().get_registry(&queue_handle, ());
|
||||||
|
|
||||||
|
let mut state = WaylandState {
|
||||||
|
conn,
|
||||||
|
compositor: None,
|
||||||
|
shm: None,
|
||||||
|
surface: None,
|
||||||
|
layer_shell: None,
|
||||||
|
layer_surface: None,
|
||||||
|
seat: None,
|
||||||
|
screen_w: 0,
|
||||||
|
screen_h: 0,
|
||||||
|
configured: false,
|
||||||
|
pending_events: VecDeque::new(),
|
||||||
|
};
|
||||||
|
|
||||||
|
event_queue
|
||||||
|
.roundtrip(&mut state)
|
||||||
|
.context("initial roundtrip")?;
|
||||||
|
|
||||||
|
if state.compositor.is_none() {
|
||||||
|
anyhow::bail!("compositor does not advertise wl_compositor");
|
||||||
|
}
|
||||||
|
if state.shm.is_none() {
|
||||||
|
anyhow::bail!("compositor does not advertise wl_shm");
|
||||||
|
}
|
||||||
|
if state.layer_shell.is_none() {
|
||||||
|
anyhow::bail!(
|
||||||
|
"compositor does not support wlr-layer-shell-unstable-v1. \
|
||||||
|
Supported compositors: Sway, Hyprland, river, etc."
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
state.init_layer_surface(&queue_handle)?;
|
||||||
|
event_queue
|
||||||
|
.roundtrip(&mut state)
|
||||||
|
.context("roundtrip after layer surface")?;
|
||||||
|
|
||||||
|
while !state.configured {
|
||||||
|
event_queue
|
||||||
|
.blocking_dispatch(&mut state)
|
||||||
|
.context("waiting for configure")?;
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(Self {
|
||||||
|
state,
|
||||||
|
event_queue,
|
||||||
|
queue_handle,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn screen_size(&self) -> (u32, u32) {
|
||||||
|
(self.state.screen_w, self.state.screen_h)
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Wait up to `timeout` for the next event. Returns `None` on timeout
|
||||||
|
/// or if the surface has been torn down.
|
||||||
|
pub fn next_event(&mut self, timeout: Duration) -> Result<Option<OverlayEvent>> {
|
||||||
|
// First drain any already-buffered events.
|
||||||
|
if let Some(ev) = self.state.pending_events.pop_front() {
|
||||||
|
return Ok(Some(ev));
|
||||||
|
}
|
||||||
|
if self.state.surface.is_none() {
|
||||||
|
return Ok(None);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Flush outgoing requests, then poll the fd with a timeout.
|
||||||
|
self.event_queue
|
||||||
|
.flush()
|
||||||
|
.context("flush before poll")?;
|
||||||
|
|
||||||
|
let read_guard = self.event_queue.prepare_read().unwrap();
|
||||||
|
let fd = read_guard.connection_fd();
|
||||||
|
let mut pollfd = [nix::poll::PollFd::new(fd, nix::poll::PollFlags::POLLIN)];
|
||||||
|
let millis = timeout.as_millis().min(u16::MAX as u128) as u16;
|
||||||
|
let n = nix::poll::poll(&mut pollfd, millis).context("poll")?;
|
||||||
|
|
||||||
|
if n > 0 {
|
||||||
|
// Data available — read and dispatch.
|
||||||
|
let _ = read_guard.read();
|
||||||
|
} else {
|
||||||
|
// Timeout — drop the read guard (cancels the read).
|
||||||
|
drop(read_guard);
|
||||||
|
return Ok(None);
|
||||||
|
}
|
||||||
|
|
||||||
|
self.event_queue
|
||||||
|
.dispatch_pending(&mut self.state)
|
||||||
|
.context("dispatch_pending")?;
|
||||||
|
|
||||||
|
Ok(self.state.pending_events.pop_front())
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Copy an ARGB8888 pixel buffer to the overlay surface via wl_shm.
|
||||||
|
pub fn present(&mut self, pixels: &[u8], width: u32, height: u32) -> Result<()> {
|
||||||
|
let shm = self.state.shm.as_ref().context("wl_shm not available")?;
|
||||||
|
let surface = self
|
||||||
|
.state
|
||||||
|
.surface
|
||||||
|
.as_ref()
|
||||||
|
.context("wl_surface not available")?;
|
||||||
|
|
||||||
|
let stride = width * 4;
|
||||||
|
let mut file = tempfile::tempfile().context("create shm tempfile")?;
|
||||||
|
file.write_all(pixels).context("write pixel buffer")?;
|
||||||
|
|
||||||
|
let pool = shm.create_pool(file.as_fd(), pixels.len() as i32, &self.queue_handle, ());
|
||||||
|
let buffer = pool.create_buffer(
|
||||||
|
0,
|
||||||
|
width as i32,
|
||||||
|
height as i32,
|
||||||
|
stride as i32,
|
||||||
|
wl_shm::Format::Argb8888,
|
||||||
|
&self.queue_handle,
|
||||||
|
(),
|
||||||
|
);
|
||||||
|
|
||||||
|
surface.attach(Some(&buffer), 0, 0);
|
||||||
|
surface.damage_buffer(0, 0, width as i32, height as i32);
|
||||||
|
surface.commit();
|
||||||
|
pool.destroy();
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Drop for WaylandBackend {
|
||||||
|
fn drop(&mut self) {
|
||||||
|
if let Some(ls) = self.state.layer_surface.take() {
|
||||||
|
ls.destroy();
|
||||||
|
}
|
||||||
|
if let Some(s) = self.state.surface.take() {
|
||||||
|
s.destroy();
|
||||||
|
}
|
||||||
|
let _ = self.state.conn.flush();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// ===========================================================================
|
||||||
|
// Internal state.
|
||||||
|
// ===========================================================================
|
||||||
|
|
||||||
|
struct WaylandState {
|
||||||
|
conn: Connection,
|
||||||
|
|
||||||
|
compositor: Option<wl_compositor::WlCompositor>,
|
||||||
|
shm: Option<wl_shm::WlShm>,
|
||||||
|
seat: Option<wl_seat::WlSeat>,
|
||||||
|
layer_shell: Option<zwlr_layer_shell_v1::ZwlrLayerShellV1>,
|
||||||
|
|
||||||
|
surface: Option<wl_surface::WlSurface>,
|
||||||
|
layer_surface: Option<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1>,
|
||||||
|
|
||||||
|
screen_w: u32,
|
||||||
|
screen_h: u32,
|
||||||
|
configured: bool,
|
||||||
|
|
||||||
|
pending_events: VecDeque<OverlayEvent>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl WaylandState {
|
||||||
|
fn init_layer_surface(&mut self, qh: &QueueHandle<Self>) -> Result<()> {
|
||||||
|
let compositor = self
|
||||||
|
.compositor
|
||||||
|
.as_ref()
|
||||||
|
.context("wl_compositor not available")?;
|
||||||
|
let layer_shell = self
|
||||||
|
.layer_shell
|
||||||
|
.as_ref()
|
||||||
|
.context("zwlr_layer_shell_v1 not available")?;
|
||||||
|
|
||||||
|
let surface = compositor.create_surface(qh, ());
|
||||||
|
let layer_surface = layer_shell.get_layer_surface(
|
||||||
|
&surface,
|
||||||
|
None,
|
||||||
|
zwlr_layer_shell_v1::Layer::Overlay,
|
||||||
|
"ringa".to_string(),
|
||||||
|
qh,
|
||||||
|
(),
|
||||||
|
);
|
||||||
|
|
||||||
|
layer_surface.set_size(0, 0);
|
||||||
|
layer_surface.set_anchor(
|
||||||
|
zwlr_layer_surface_v1::Anchor::Top
|
||||||
|
| zwlr_layer_surface_v1::Anchor::Bottom
|
||||||
|
| zwlr_layer_surface_v1::Anchor::Left
|
||||||
|
| zwlr_layer_surface_v1::Anchor::Right,
|
||||||
|
);
|
||||||
|
layer_surface.set_exclusive_zone(-1);
|
||||||
|
layer_surface
|
||||||
|
.set_keyboard_interactivity(zwlr_layer_surface_v1::KeyboardInteractivity::Exclusive);
|
||||||
|
|
||||||
|
surface.commit();
|
||||||
|
|
||||||
|
self.surface = Some(surface);
|
||||||
|
self.layer_surface = Some(layer_surface);
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// ===========================================================================
|
||||||
|
// Wayland dispatch implementations.
|
||||||
|
// ===========================================================================
|
||||||
|
|
||||||
|
impl Dispatch<wl_registry::WlRegistry, ()> for WaylandState {
|
||||||
|
fn event(
|
||||||
|
state: &mut Self,
|
||||||
|
registry: &wl_registry::WlRegistry,
|
||||||
|
event: wl_registry::Event,
|
||||||
|
_: &(),
|
||||||
|
_: &Connection,
|
||||||
|
qh: &QueueHandle<Self>,
|
||||||
|
) {
|
||||||
|
let wl_registry::Event::Global {
|
||||||
|
name,
|
||||||
|
interface,
|
||||||
|
version,
|
||||||
|
} = event
|
||||||
|
else {
|
||||||
|
return;
|
||||||
|
};
|
||||||
|
match interface.as_str() {
|
||||||
|
"wl_compositor" => {
|
||||||
|
state.compositor = Some(registry.bind(name, version.min(4), qh, ()));
|
||||||
|
}
|
||||||
|
"wl_shm" => {
|
||||||
|
state.shm = Some(registry.bind(name, 1, qh, ()));
|
||||||
|
}
|
||||||
|
"wl_seat" => {
|
||||||
|
state.seat = Some(registry.bind(name, version.min(7), qh, ()));
|
||||||
|
}
|
||||||
|
"zwlr_layer_shell_v1" => {
|
||||||
|
state.layer_shell = Some(registry.bind(name, version.min(4), qh, ()));
|
||||||
|
}
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Dispatch<wl_seat::WlSeat, ()> for WaylandState {
|
||||||
|
fn event(
|
||||||
|
_state: &mut Self,
|
||||||
|
seat: &wl_seat::WlSeat,
|
||||||
|
event: wl_seat::Event,
|
||||||
|
_: &(),
|
||||||
|
_: &Connection,
|
||||||
|
qh: &QueueHandle<Self>,
|
||||||
|
) {
|
||||||
|
if let wl_seat::Event::Capabilities {
|
||||||
|
capabilities: WEnum::Value(caps),
|
||||||
|
} = event
|
||||||
|
{
|
||||||
|
if caps.contains(wl_seat::Capability::Keyboard) {
|
||||||
|
seat.get_keyboard(qh, ());
|
||||||
|
}
|
||||||
|
if caps.contains(wl_seat::Capability::Pointer) {
|
||||||
|
seat.get_pointer(qh, ());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Dispatch<wl_keyboard::WlKeyboard, ()> for WaylandState {
|
||||||
|
fn event(
|
||||||
|
state: &mut Self,
|
||||||
|
_: &wl_keyboard::WlKeyboard,
|
||||||
|
event: wl_keyboard::Event,
|
||||||
|
_: &(),
|
||||||
|
_: &Connection,
|
||||||
|
_: &QueueHandle<Self>,
|
||||||
|
) {
|
||||||
|
if let wl_keyboard::Event::Key {
|
||||||
|
key,
|
||||||
|
state: WEnum::Value(wl_keyboard::KeyState::Pressed),
|
||||||
|
..
|
||||||
|
} = event
|
||||||
|
{
|
||||||
|
if key == KEY_ESCAPE {
|
||||||
|
state.pending_events.push_back(OverlayEvent::Close);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Dispatch<wl_pointer::WlPointer, ()> for WaylandState {
|
||||||
|
fn event(
|
||||||
|
state: &mut Self,
|
||||||
|
_: &wl_pointer::WlPointer,
|
||||||
|
event: wl_pointer::Event,
|
||||||
|
_: &(),
|
||||||
|
_: &Connection,
|
||||||
|
_: &QueueHandle<Self>,
|
||||||
|
) {
|
||||||
|
match event {
|
||||||
|
wl_pointer::Event::Enter {
|
||||||
|
surface_x,
|
||||||
|
surface_y,
|
||||||
|
..
|
||||||
|
} => {
|
||||||
|
state
|
||||||
|
.pending_events
|
||||||
|
.push_back(OverlayEvent::CursorMoved(surface_x, surface_y));
|
||||||
|
}
|
||||||
|
wl_pointer::Event::Motion {
|
||||||
|
surface_x,
|
||||||
|
surface_y,
|
||||||
|
..
|
||||||
|
} => {
|
||||||
|
state
|
||||||
|
.pending_events
|
||||||
|
.push_back(OverlayEvent::CursorMoved(surface_x, surface_y));
|
||||||
|
}
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Dispatch<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1, ()> for WaylandState {
|
||||||
|
fn event(
|
||||||
|
state: &mut Self,
|
||||||
|
layer_surface: &zwlr_layer_surface_v1::ZwlrLayerSurfaceV1,
|
||||||
|
event: zwlr_layer_surface_v1::Event,
|
||||||
|
_: &(),
|
||||||
|
_: &Connection,
|
||||||
|
_: &QueueHandle<Self>,
|
||||||
|
) {
|
||||||
|
match event {
|
||||||
|
zwlr_layer_surface_v1::Event::Configure {
|
||||||
|
serial,
|
||||||
|
width,
|
||||||
|
height,
|
||||||
|
} => {
|
||||||
|
layer_surface.ack_configure(serial);
|
||||||
|
const MAX_SCREEN_DIM: u32 = 16384;
|
||||||
|
if width > 0 && height > 0 && width <= MAX_SCREEN_DIM && height <= MAX_SCREEN_DIM {
|
||||||
|
state.screen_w = width;
|
||||||
|
state.screen_h = height;
|
||||||
|
state.configured = true;
|
||||||
|
state
|
||||||
|
.pending_events
|
||||||
|
.push_back(OverlayEvent::Configure(width, height));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
zwlr_layer_surface_v1::Event::Closed => {
|
||||||
|
state.pending_events.push_back(OverlayEvent::Close);
|
||||||
|
}
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
delegate_noop!(WaylandState: ignore wl_compositor::WlCompositor);
|
||||||
|
delegate_noop!(WaylandState: ignore wl_region::WlRegion);
|
||||||
|
delegate_noop!(WaylandState: ignore wl_surface::WlSurface);
|
||||||
|
delegate_noop!(WaylandState: ignore wl_shm::WlShm);
|
||||||
|
delegate_noop!(WaylandState: ignore wl_shm_pool::WlShmPool);
|
||||||
|
delegate_noop!(WaylandState: ignore wl_buffer::WlBuffer);
|
||||||
|
delegate_noop!(WaylandState: ignore zwlr_layer_shell_v1::ZwlrLayerShellV1);
|
||||||
Reference in new issue
Block a user