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|
use anyhow::{anyhow, Result};
use gtk4::{self as gtk, glib, cairo};
use gtk4::prelude::*;
use glib::{clone, spawn_future_local};
use std::thread;
use std::sync::{Arc, Mutex};
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 Overray: Send + 'static{}
pub trait Source: Send + 'static{
type Attr: Overray;
fn next(&mut self, fbpool: impl FbSourceOnce) -> Result<Packet<Self::Attr>>;
}
impl Overray for (){}
struct AppState<T>{
next: Mutex<Option<Packet<T>>>,
update: Mutex<Signal>,
abort: Mutex<Signal>,
fbpool: Mutex<FbPool>,
}
fn sourcing_loop<Attr: Overray>(
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: Overray>(app: >k::Application, apps: Arc<AppState<Attr>>){
let draw = gtk::DrawingArea::new();
let mut frame_cache: Option<cairo::ImageSurface> = None;
draw.set_draw_func(clone!{
#[strong] apps,
move |_draw, ctx, canvas_w, canvas_h|{
ctx.set_source_rgb(0., 0., 0.);
ctx.paint().unwrap();
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 = Some(newfb.image.into_inner());
}
if let Some(image) = frame_cache.clone(){
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();
}
}
});
spawn_future_local(poll_fn(clone!{
#[strong] apps,
#[strong] draw,
move |ctx|{
loop{
match apps.update.lock().unwrap().poll(ctx){
Poll::Ready(_) => {
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 win = gtk::ApplicationWindow::builder()
.application(app)
.child(&draw)
.build();
win.present();
}
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()
.build();
app.connect_activate(clone!{
#[strong] apps,
move |app| activate(app, apps.clone())
});
Ok(app.run())
}
|
