servo: Structure layout task a little more

Source-Repo: https://github.com/servo/servo
Source-Revision: 35e24aafcafb3a1231f75209adb153bc314766e3

servo/src/servo/layout/layout.rs

@@ -6,10 +6,11 @@ Builds display lists on request and passes them to the renderer
 
 import task::*;
 import comm::*;
-import display_list::*;
 import gfx::geom;
 import gfx::geom::*;
 import gfx::renderer;
+import dom::base::*;
+import display_list::*;
 
 enum msg {
     build,
@@ -19,47 +20,17 @@ enum msg {
 fn layout(renderer: chan<renderer::msg>) -> chan<msg> {
 
     spawn_listener::<msg> {|po|
-        let mut x1 = 100;
-        let mut y1 = 100;
-        let mut w1 = 200;
-        let mut h1 = 200;
-        let mut x2 = 200;
-        let mut y2 = 200;
-        let mut w2 = 300;
-        let mut h2 = 300;
+
+        let dom = new_node(nk_div);
 
         loop {
             alt recv(po) {
               build {
-                let dlist = [
-                    display_item({
-                        item_type: solid_color,
-                        bounds: geom::box(
-                            int_to_au(x1),
-                            int_to_au(y1),
-                            int_to_au(w1),
-                            int_to_au(h1))
-                    }),
-                    display_item({
-                        item_type: solid_color,
-                        bounds: geom::box(
-                            int_to_au(x2),
-                            int_to_au(y2),
-                            int_to_au(w2),
-                            int_to_au(h2))
-                    })
-                ];
+
+                let box = layout_dom(dom);
+                let dlist = build_display_list(box);
 
                 send(renderer, gfx::renderer::draw(dlist));
-
-                x1 += 1;
-                y1 += 1;
-                x2 -= 1;
-                y2 -= 1;
-                if x1 > 800 { x1 = 0 }
-                if y1 > 600 { y1 = 0 }
-                if x2 < 0 { x2 = 800 }
-                if y2 < 0 { y2 = 600 }
               }
               exit {
                 break;
@@ -69,3 +40,28 @@ fn layout(renderer: chan<renderer::msg>) -> chan<msg> {
     }
 
 }
+
+fn layout_dom(dom: node) -> base::box {
+    base::new_box(dom)
+}
+
+fn build_display_list(_box: base::box) -> display_list::display_list {
+    [
+        display_item({
+            item_type: solid_color,
+            bounds: geom::box(
+                int_to_au(0),
+                int_to_au(0),
+                int_to_au(100),
+                int_to_au(100))
+        }),
+        display_item({
+            item_type: solid_color,
+            bounds: geom::box(
+                int_to_au(100),
+                int_to_au(100),
+                int_to_au(100),
+                int_to_au(100))
+        })
+    ]
+}