From acf30d100156964c9a68e796ae2c0fc555a272fb Mon Sep 17 00:00:00 2001
From: Gergely Polonkai <gergely@polonkai.eu>
Date: Sat, 21 May 2022 07:58:26 +0200
Subject: [PATCH] Initial version with a non-working example

---
 Cargo.lock  | 321 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   8 ++
 src/main.rs | 154 +++++++++++++++++++++++++
 3 files changed, 483 insertions(+)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f8e9ef4
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,321 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+
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+ "log",
+ "nix",
+]
+
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+ "nix",
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+ "wayland-cursor",
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+ "wayland-sys",
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+version = "0.1.0"
+dependencies = [
+ "calloop",
+ "smithay-client-toolkit",
+]
+
+[[package]]
+name = "xcursor"
+version = "0.3.4"
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+ "nom",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..75d50a1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "wl-seasonal-hours-clock"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+smithay-client-toolkit = "0.15"
+calloop = "0.9"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7d90a93
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,154 @@
+extern crate smithay_client_toolkit as sctk;
+
+use calloop::{timer::Timer, EventLoop};
+use sctk::reexports::client::protocol::{wl_shm, wl_surface};
+use sctk::shm::AutoMemPool;
+use sctk::window::{Event as WEvent, FallbackFrame};
+
+sctk::default_environment!(TimedRefresh, desktop);
+
+fn main() {
+    let (env, display, queue) = sctk::new_default_environment!(TimedRefresh, desktop)
+        .expect("Unable to connect to a Wayland compositor");
+
+    let surface = env
+        .create_surface_with_scale_callback(|dpi, _surface, _dispatch_data| {
+            println!("dpi changed to {}", dpi);
+        })
+        .detach();
+
+    let mut next_action = None::<WEvent>;
+
+    let mut window = env
+        .create_window::<FallbackFrame, _>(
+            surface,
+            None,
+            (100, 100),
+            move |evt, mut dispatch_data| {
+                let next_action = dispatch_data.get::<Option<WEvent>>().unwrap();
+                let replace = matches!(
+                    (&evt, &*next_action),
+                    (_, &None)
+                        | (_, &Some(WEvent::Refresh))
+                        | (&WEvent::Configure { .. }, &Some(WEvent::Configure { .. }))
+                        | (&WEvent::Close, _)
+                );
+
+                if replace {
+                    *next_action = Some(evt);
+                }
+            },
+        )
+        .expect("Failed to create a window !");
+
+    window.set_title("Seasonal Hours Clock".to_string());
+
+    let mut pool = env
+        .create_auto_pool()
+        .expect("Failed to create the memory pool.");
+    let mut need_redraw = false;
+    let mut dimensions = (700, 700);
+
+    if !env.get_shell().unwrap().needs_configure() {
+        redraw(&mut pool, window.surface(), dimensions).expect("Failed to draw");
+        window.refresh()
+    }
+
+    let mut event_loop = EventLoop::<Option<WEvent>>::try_new().unwrap();
+    let handle = event_loop.handle();
+    let source = Timer::new().expect("Failed to create timer event source!");
+    let timer_handle = source.handle();
+    timer_handle.add_timeout(std::time::Duration::from_secs(1), "");
+
+    handle.insert_source(source, |_, timer_handle, _| {
+        println!("Redraw!");
+        redraw(&mut pool, window.surface(), dimensions).expect("Failed to draw");
+        window.refresh();
+        timer_handle.add_timeout(std::time::Duration::from_secs(1), "");
+    });
+
+    sctk::WaylandSource::new(queue).quick_insert(handle).unwrap();
+
+    loop {
+        // Update every second
+        match next_action.take() {
+            Some(WEvent::Close) => break,
+            Some(WEvent::Refresh) => {
+                window.refresh();
+                window.surface().commit();
+            }
+            Some(WEvent::Configure {
+                new_size,
+                states: _,
+            }) => {
+                if let Some((w, h)) = new_size {
+                    if dimensions != (w, h) {
+                        dimensions = (w, h);
+                    }
+                }
+                window.resize(dimensions.0, dimensions.1);
+                window.refresh();
+                need_redraw = true;
+            }
+            None => {}
+        }
+
+        if need_redraw {
+            need_redraw = false;
+
+            redraw(&mut pool, window.surface(), dimensions).expect("Failed to draw")
+        }
+
+        if let Err(e) = display.flush() {
+            if e.kind() != ::std::io::ErrorKind::WouldBlock {
+                eprintln!("Error while trying to flush the wayland socket: {:?}", e);
+            }
+        }
+
+        event_loop.dispatch(None, &mut next_action).unwrap();
+    }
+}
+
+fn redraw(
+    pool: &mut AutoMemPool,
+    surface: &wl_surface::WlSurface,
+    (buf_x, buf_y): (u32, u32),
+) -> Result<(), ::std::io::Error> {
+    let (canvas, new_buffer) = pool.buffer(
+        buf_x as i32,
+        buf_y as i32,
+        4 * buf_x as i32,
+        wl_shm::Format::Argb8888,
+    )?;
+
+    // We do not have anything to draw yet, so draw an empty surface
+    for dst_pixel in canvas.chunks_exact_mut(4) {
+        let r = 0u32;
+        let g = 0u32;
+        let b = 0u32;
+        let a = 255u32;
+
+        let r = ::std::cmp::min(0xFF, (0xFF * (0xFF - a) + a * r) / 0xFF);
+        let g = ::std::cmp::min(0xFF, (0xFF * (0xFF - a) + a * g) / 0xFF);
+        let b = ::std::cmp::min(0xFF, (0xFF * (0xFF - a) + a * b) / 0xFF);
+
+        let pixel: [u8; 4] = ((0xFF << 24) + (r << 16) + (g << 8) + b).to_ne_bytes();
+
+        dst_pixel[0] = pixel[0];
+        dst_pixel[1] = pixel[1];
+        dst_pixel[2] = pixel[2];
+        dst_pixel[3] = pixel[3];
+    }
+
+    surface.attach(Some(&new_buffer), 0, 0);
+
+    if surface.as_ref().version() >= 4 {
+        surface.damage_buffer(0, 0, buf_x as i32, buf_y as i32);
+    } else {
+        surface.damage(0, 0, buf_x as i32, buf_y as i32);
+    }
+
+    surface.commit();
+
+    Ok(())
+}