Add CLI arg parsing with color customization

src/deco.rs

@@ -133,6 +133,7 @@ impl Deco {
         subsurface.set_forward_to_client(false);
         subsurface.send_place_below(&host_surface);
         let pool = SimpleBufferPool::new(globals, 1, 1).unwrap();
+        let args = crate::ARGS.get().unwrap();
         let deco = Rc::new(Deco {
             bounds: RefCell::new(Bounds {
                 x: 0,
@@ -140,8 +141,8 @@ impl Deco {
                 width: 10,
                 height: 10,
             }),
-            top_size: 24,
-            border_size: 8,
+            top_size: args.thickness as i32, // TODO: title
+            border_size: args.thickness as i32,
             wl_surface: wl_surface.clone(),
             subsurface,
             toplevel: toplevel.clone(),
@@ -192,13 +193,21 @@ impl Deco {
     fn draw(&self) -> eyre::Result<Rc<WlBuffer>> {
         let bounds = self.bounds.borrow();
         let (width, height) = self.transform_size(bounds.width, bounds.height);
-        log::info!("{:?} -> {}x{}", bounds, width, height);
 
         let mut pool = self.pool.borrow_mut();
         let (buf, map) = pool.buffer(width, height)?;
+        let (pre, pix, post) = unsafe { map.align_to_mut::<u32>() };
+        assert!(pre.len() == 0 && post.len() == 0);
+        let bg = crate::ARGS
+            .get()
+            .unwrap()
+            .background
+            .premultiply()
+            .to_rgba8();
+        let bg_argb = u32::from_be_bytes([bg.a, bg.r, bg.g, bg.b]);
         for y in 0..height {
-            for x in 0..width * 4 {
-                map[(y * (width * 4) + x) as usize] = 0xaf;
+            for x in 0..width {
+                pix[(y * width + x) as usize] = bg_argb;
             }
         }