Render with winit/softbuffer

Cargo.toml

@@ -7,3 +7,10 @@ edition = "2021"
 
 [dependencies]
 alacritty_terminal = "0.19"
+softbuffer = "0.4"
+tiny-skia = "0.11"
+winit = "0.29"
+
+[dependencies.cosmic-text]
+git = "https://github.com/pop-os/cosmic-text.git"
+branch = "refactor"

src/main.rs

@@ -1,13 +1,24 @@
 use alacritty_terminal::{
     config::{Config, PtyConfig},
-    event::{Event, EventListener, Notify, WindowSize},
-    event_loop::{EventLoop, Notifier},
+    event::{Event as TermEvent, EventListener, Notify, WindowSize},
+    event_loop::{EventLoop as PtyEventLoop, Notifier},
     grid::Dimensions,
     index::{Column, Line, Point},
     sync::FairMutex,
+    term::cell::Flags,
     tty, Term,
 };
-use std::sync::{mpsc, Arc};
+use cosmic_text::{
+    Attrs, AttrsList, Buffer, BufferLine, Family, FontSystem, Metrics, Shaping, Style, SwashCache,
+    Weight,
+};
+use std::{num::NonZeroU32, rc::Rc, slice, sync::Arc};
+use tiny_skia::{Color, Paint, PixmapMut, Rect, Transform};
+use winit::{
+    event::{ElementState, Event as WinitEvent, KeyEvent, Modifiers, WindowEvent},
+    event_loop::{ControlFlow, EventLoopBuilder, EventLoopProxy},
+    window::WindowBuilder,
+};
 
 struct TermSize {
     rows: usize,
@@ -29,21 +40,35 @@ impl Dimensions for TermSize {
 }
 
 #[derive(Clone)]
-struct EventProxy(mpsc::Sender<Event>);
+struct EventProxy(EventLoopProxy<TermEvent>);
 
 impl EventListener for EventProxy {
-    fn send_event(&self, event: Event) {
-        let _ = self.0.send(event);
+    fn send_event(&self, event: TermEvent) {
+        let _ = self.0.send_event(event);
     }
 }
 
 fn main() {
+    let mut font_system = FontSystem::new();
+    let mut swash_cache = SwashCache::new();
+    let metrics = Metrics::new(14.0, 20.0);
+    let mut buffer = Buffer::new_empty(metrics);
+    let mut buffer = buffer.borrow_with(&mut font_system);
+
+    let event_loop = EventLoopBuilder::<TermEvent>::with_user_event()
+        .build()
+        .unwrap();
+    let event_loop_proxy = event_loop.create_proxy();
+    let window = Rc::new(WindowBuilder::new().build(&event_loop).unwrap());
+
     let config = Config::default();
     let dimensions = TermSize { rows: 24, cols: 80 };
-    let (event_tx, event_rx) = mpsc::channel();
-    let event_proxy = EventProxy(event_tx);
-    let term = Term::new(&config, &dimensions, event_proxy.clone());
-    let term = Arc::new(FairMutex::new(term));
+    let event_proxy = EventProxy(event_loop_proxy);
+    let term = Arc::new(FairMutex::new(Term::new(
+        &config,
+        &dimensions,
+        event_proxy.clone(),
+    )));
 
     let pty_config = PtyConfig::default();
     let window_size = WindowSize {
@@ -55,43 +80,187 @@ fn main() {
     let window_id = 0;
     let pty = tty::new(&pty_config, window_size, window_id).unwrap();
 
-    let event_loop = EventLoop::new(term.clone(), event_proxy, pty, pty_config.hold, false);
-    let notifier = Notifier(event_loop.channel());
-    let join_handle = event_loop.spawn();
+    let pty_event_loop = PtyEventLoop::new(term.clone(), event_proxy, pty, pty_config.hold, false);
+    let notifier = Notifier(pty_event_loop.channel());
+    let pty_join_handle = pty_event_loop.spawn();
 
     for i in 0..dimensions.rows {
         notifier.notify(format!("echo {}\r", i).into_bytes());
     }
-    notifier.notify(&b"exit 0\r"[..]);
 
-    loop {
-        let event = match event_rx.recv() {
-            Ok(ok) => ok,
-            Err(err) => {
-                eprintln!("failed to recv event: {}", err);
-                break;
+    let context = softbuffer::Context::new(window.clone()).unwrap();
+    let mut surface = softbuffer::Surface::new(&context, window.clone()).unwrap();
+    let mut modifiers = Modifiers::default();
+    event_loop
+        .run(move |event, elwt| {
+            elwt.set_control_flow(ControlFlow::Wait);
+
+            match event {
+                WinitEvent::WindowEvent {
+                    window_id,
+                    event: WindowEvent::RedrawRequested,
+                } if window_id == window.id() => {
+                    let (width, height) = {
+                        let size = window.inner_size();
+                        (size.width, size.height)
+                    };
+                    surface
+                        .resize(
+                            NonZeroU32::new(width).unwrap(),
+                            NonZeroU32::new(height).unwrap(),
+                        )
+                        .unwrap();
+
+                    let mut surface_buffer = surface.buffer_mut().unwrap();
+                    let surface_buffer_u8 = unsafe {
+                        slice::from_raw_parts_mut(
+                            surface_buffer.as_mut_ptr() as *mut u8,
+                            surface_buffer.len() * 4,
+                        )
+                    };
+                    let mut pixmap =
+                        PixmapMut::from_bytes(surface_buffer_u8, width, height).unwrap();
+                    pixmap.fill(Color::from_rgba8(0, 0, 0, 0xFF));
+
+                    // Set scroll to view scroll
+                    //TODO buffer.set_scroll(*scroll);
+                    // Set size, will relayout and shape until scroll if changed
+                    buffer.set_size(width as f32, height as f32);
+                    // Shape until scroll, ensures scroll is clamped
+                    buffer.shape_until_scroll(true);
+                    // Update scroll after buffer clamps it
+                    //TODO *scroll = buffer.scroll();
+
+                    let mut paint = Paint::default();
+                    paint.anti_alias = false;
+                    let transform = Transform::identity();
+                    buffer.draw(
+                        &mut swash_cache,
+                        cosmic_text::Color::rgb(0xFF, 0xFF, 0xFF),
+                        |x, y, w, h, color| {
+                            paint.set_color_rgba8(color.r(), color.g(), color.b(), color.a());
+                            pixmap.fill_rect(
+                                Rect::from_xywh(x as f32, y as f32, w as f32, h as f32).unwrap(),
+                                &paint,
+                                transform,
+                                None,
+                            );
+                        },
+                    );
+                    buffer.set_redraw(false);
+
+                    surface_buffer.present().unwrap();
+                }
+                WinitEvent::WindowEvent {
+                    event:
+                        WindowEvent::KeyboardInput {
+                            event:
+                                KeyEvent {
+                                    text: Some(text),
+                                    state: ElementState::Pressed,
+                                    ..
+                                },
+                            ..
+                        },
+                    window_id,
+                } if window_id == window.id() => {
+                    println!("{:?}", text);
+                    notifier.notify(text.as_bytes().to_vec());
+                }
+                WinitEvent::WindowEvent {
+                    event: WindowEvent::ModifiersChanged(new_modifiers),
+                    window_id,
+                } if window_id == window.id() => {
+                    modifiers = new_modifiers;
+                }
+                WinitEvent::WindowEvent {
+                    event: WindowEvent::CloseRequested,
+                    window_id,
+                } if window_id == window.id() => {
+                    term.lock().exit();
+                }
+                WinitEvent::UserEvent(user_event) => {
+                    println!("{:?}", user_event);
+                    match user_event {
+                        TermEvent::PtyWrite(text) => notifier.notify(text.into_bytes()),
+                        TermEvent::Exit => elwt.exit(),
+                        _ => {}
+                    }
+
+                    //TODO: is redraw needed after all events?
+                    //TODO: use LineDamageBounds
+                    {
+                        //TODO: set color to default fg
+                        let default_attrs = Attrs::new().family(Family::Monospace);
+                        let mut last_point = Point::new(Line(0), Column(0));
+                        let mut text = String::new();
+                        let mut attrs_list = AttrsList::new(default_attrs);
+                        for indexed in term.lock().grid().display_iter() {
+                            if indexed.point.line != last_point.line {
+                                let line_i = last_point.line.0 as usize;
+                                while line_i >= buffer.lines.len() {
+                                    buffer.lines.push(BufferLine::new(
+                                        "",
+                                        AttrsList::new(default_attrs),
+                                        Shaping::Advanced,
+                                    ));
+                                    buffer.set_redraw(true);
+                                }
+
+                                if buffer.lines[line_i].set_text(text.clone(), attrs_list.clone()) {
+                                    buffer.set_redraw(true);
+                                }
+
+                                text.clear();
+                                attrs_list.clear_spans();
+                            }
+                            //TODO: use indexed.point.column?
+
+                            let start = text.len();
+                            text.push(indexed.cell.c);
+                            let end = text.len();
+
+                            let mut attrs = default_attrs;
+                            println!("{:?}", indexed.cell.fg);
+                            //TODO: fg and bg
+                            //TODO: more flags
+                            if indexed.cell.flags.contains(Flags::BOLD) {
+                                attrs = attrs.weight(Weight::BOLD);
+                            }
+                            if indexed.cell.flags.contains(Flags::ITALIC) {
+                                attrs = attrs.style(Style::Italic);
+                            }
+                            if attrs != attrs_list.defaults() {
+                                attrs_list.add_span(start..end, attrs);
+                            }
+
+                            last_point = indexed.point;
+                        }
+
+                        //TODO: do not repeat!
+                        let line_i = last_point.line.0 as usize;
+                        while line_i >= buffer.lines.len() {
+                            buffer.lines.push(BufferLine::new(
+                                "",
+                                AttrsList::new(default_attrs),
+                                Shaping::Advanced,
+                            ));
+                            buffer.set_redraw(true);
+                        }
+
+                        if buffer.lines[line_i].set_text(text, attrs_list) {
+                            buffer.set_redraw(true);
+                        }
+                    }
+
+                    if buffer.redraw() {
+                        window.request_redraw();
+                    }
+                }
+                _ => {}
             }
-        };
-        println!("{:?}", event);
-        match event {
-            Event::PtyWrite(text) => notifier.notify(text.into_bytes()),
-            Event::Exit => break,
-            _ => {}
-        }
+        })
+        .unwrap();
 
-        let mut last_point = Point::new(Line(0), Column(0));
-        let mut text = String::new();
-        for indexed in term.lock().grid().display_iter() {
-            if indexed.point.line != last_point.line {
-                println!("{:2}: {:?}", last_point.line.0, text);
-                text.clear();
-            }
-            //TODO: use indexed.point.column?
-            text.push(indexed.cell.c);
-            last_point = indexed.point;
-        }
-        println!("{:2}: {:?}", last_point.line.0, text);
-    }
-
-    join_handle.join().unwrap();
+    //TODO: hangs after event loop exit pty_join_handle.join().unwrap();
 }