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#![cfg(feature = "gui")]
use anyhow::{anyhow, Result};
use gtk4::{self as gtk, glib, cairo, gio};
use gtk4::prelude::*;
use glib::{clone, spawn_future_local};
use std::thread;
use std::sync::{Arc, Mutex};
use std::rc::Rc;
use std::cell::Cell;
use crate::sync::Signal;
use std::future::poll_fn;
use std::task::Poll;
pub struct FbPool{
size: usize,
pool: Vec<cairo::ImageSurfaceDataOwned>,
}
impl FbPool{
pub fn new(size: usize) -> Self{
FbPool{
size,
pool: Vec::with_capacity(size),
}
}
pub fn put(&mut self, buf: cairo::ImageSurfaceDataOwned){
if self.pool.len() < self.size{
self.pool.push(buf);
}
}
pub fn get(&mut self, w: usize, h: usize) -> Result<cairo::ImageSurface>{
while let Some(i) = self.pool.pop(){
let i = i.into_inner();
if i.width() as usize == w && i.height() as usize == h{
return Ok(i);
}
}
Ok(cairo::ImageSurface::create(
cairo::Format::Rgb24,
w.try_into()?, h.try_into()?)?)
}
}
pub trait FbSourceOnce{
fn get(self, w: usize, h: usize) -> Result<cairo::ImageSurface>;
}
impl FbSourceOnce for &Mutex<FbPool>{
fn get(self, w: usize, h: usize) -> Result<cairo::ImageSurface>{
self.lock().map_err(|e| anyhow!("{}", e))?.get(w, h)
}
}
pub struct Packet<T>{
pub image: cairo::ImageSurfaceDataOwned,
pub attr: T,
}
pub trait Overlay: Send + 'static{
type Widget: glib::object::IsA<gtk::Widget>;
fn empty() -> Result<Self::Widget>;
fn activate(_widget: &Self::Widget) -> Result<()>{
Ok(())
}
fn update(&self, _widget: &Self::Widget) -> Result<()>{
Ok(())
}
}
pub trait Source: Send + 'static{
type Attr: Overlay;
fn next(&mut self, fbpool: impl FbSourceOnce) -> Result<Packet<Self::Attr>>;
}
impl Overlay for (){
type Widget = gtk::Box;
fn empty() -> Result<gtk::Box>{
Ok(gtk::Box::builder()
.halign(gtk::Align::Start)
.valign(gtk::Align::Start)
.visible(false)
.build())
}
}
struct AppState<T>{
next: Mutex<Option<Packet<T>>>,
update: Mutex<Signal>,
abort: Mutex<Signal>,
fbpool: Mutex<FbPool>,
}
fn sourcing_loop<Attr: Overlay>(
apps: &AppState<Attr>,
src: &mut impl Source<Attr=Attr>
) -> Result<()>{
loop{
let p = src.next(&apps.fbpool)?;
let old = apps.next.lock()
.map_err(|e| anyhow!("{}", e))?
.replace(p);
apps.update.lock().map_err(|e| anyhow!("{}", e))?.wake();
if let Some(old) = old{
apps.fbpool.lock()
.map_err(|e| anyhow!("{}", e))?
.put(old.image);
}
}
}
fn activate<Attr: Overlay>(app: >k::Application, apps: Arc<AppState<Attr>>){
let draw = gtk::DrawingArea::new();
let overlay = Attr::empty().unwrap();
let frame_cache: Rc<Cell<Option<cairo::ImageSurface>>>
= Rc::new(Cell::new(None));
let attr_cache: Rc<Cell<Option<Attr>>> = Rc::new(Cell::new(None));
draw.set_draw_func(clone!{
#[strong] frame_cache,
move |_draw, ctx, canvas_w, canvas_h|{
ctx.set_source_rgb(0., 0., 0.);
ctx.paint().unwrap();
if let Some(image) = frame_cache.take(){
let ipat = cairo::SurfacePattern::create(&image);
let scale = ((canvas_w as f64) / (image.width() as f64)).min(
(canvas_h as f64) / (image.height() as f64));
ctx.scale(scale, scale);
ctx.set_source(&ipat).unwrap();
ctx.paint().unwrap();
frame_cache.replace(Some(image));
}
}
});
overlay.add_tick_callback(clone!{
#[strong] attr_cache,
move |overlay, _clock|{
if let Some(attr) = attr_cache.take(){
attr.update(overlay).unwrap();
attr_cache.replace(Some(attr));
}
glib::ControlFlow::Continue
}
});
spawn_future_local(poll_fn(clone!{
#[strong] apps,
#[strong] draw,
#[strong] frame_cache,
#[strong] attr_cache,
#[strong] overlay,
move |ctx|{
loop{
match apps.update.lock().unwrap().poll(ctx){
Poll::Ready(_) => {
if let Some(newfb) = apps.next.lock().unwrap().take(){
if let Some(lastframe) = frame_cache.take(){
apps.fbpool.lock().unwrap()
.put(lastframe.take_data().unwrap());
}
frame_cache.replace(Some(newfb.image.into_inner()));
newfb.attr.update(&overlay).unwrap();
attr_cache.replace(Some(newfb.attr));
}
draw.queue_draw();
},
pending => return pending,
}
}
}
}));
spawn_future_local(poll_fn(clone!{
#[strong] apps,
#[strong] app,
move |ctx|{
loop{
match apps.abort.lock().unwrap().poll(ctx){
Poll::Ready(_) => {
app.quit();
},
pending => return pending,
}
}
}
}));
let olcontainer = gtk::Overlay::builder()
.child(&draw)
.build();
olcontainer.add_overlay(&overlay);
let win = gtk::ApplicationWindow::builder()
.application(app)
.child(&olcontainer)
.build();
win.present();
Attr::activate(&overlay).unwrap();
}
pub fn main(src: impl Source + 'static) -> Result<glib::ExitCode>{
let apps = Arc::new(AppState{
next: Mutex::new(None),
update: Mutex::new(Signal::new()),
abort: Mutex::new(Signal::new()),
fbpool: Mutex::new(FbPool::new(4)),
});
thread::spawn(clone!{
#[strong] apps,
move ||{
let mut src = src;
let res = sourcing_loop(&apps, &mut src);
apps.abort.lock().unwrap().wake();
res.unwrap();
}
});
let app = gtk::Application::builder()
.flags(gio::ApplicationFlags::HANDLES_COMMAND_LINE)
.build();
app.connect_command_line(clone!{
#[strong] apps,
move |app, _| {
activate(app, apps.clone());
0
}
});
Ok(app.run())
}
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