Made Page.window_size and Page.next_subpage_id Traceable, added trait…

… Encodable for WindowSizeData, ViewportPx, PagePx, and DevicePixel

src/components/msg/constellation_msg.rs

@@ -8,6 +8,7 @@
 use geom::rect::Rect;
 use geom::size::TypedSize2D;
 use geom::scale_factor::ScaleFactor;
+use serialize::Encodable;
 use servo_util::geometry::{DevicePixel, PagePx, ViewportPx};
 use std::comm::{channel, Sender, Receiver};
 use url::Url;
@@ -35,6 +36,7 @@ pub struct Failure {
     pub subpage_id: Option<SubpageId>,
 }
 
+#[deriving(Encodable)]
 pub struct WindowSizeData {
     /// The size of the initial layout viewport, before parsing an
     /// http://www.w3.org/TR/css-device-adapt/#initial-viewport

src/components/script/page.rs

@@ -60,7 +60,7 @@ pub struct Page {
     damage: Traceable<RefCell<Option<DocumentDamage>>>,
 
     /// The current size of the window, in pixels.
-    pub window_size: Untraceable<Cell<WindowSizeData>>,
+    pub window_size: Traceable<Cell<WindowSizeData>>,
 
     js_info: Traceable<RefCell<Option<JSPageInfo>>>,
 
@@ -70,7 +70,7 @@ pub struct Page {
     /// when reloading.
     url: Untraceable<RefCell<Option<(Url, bool)>>>,
 
-    next_subpage_id: Untraceable<Cell<SubpageId>>,
+    next_subpage_id: Traceable<Cell<SubpageId>>,
 
     /// Pending resize event, if any.
     pub resize_event: Untraceable<Cell<Option<WindowSizeData>>>,
@@ -132,10 +132,10 @@ impl Page {
             layout_chan: Untraceable::new(layout_chan),
             layout_join_port: Untraceable::new(RefCell::new(None)),
             damage: Traceable::new(RefCell::new(None)),
-            window_size: Untraceable::new(Cell::new(window_size)),
+            window_size: Traceable::new(Cell::new(window_size)),
             js_info: Traceable::new(RefCell::new(Some(js_info))),
             url: Untraceable::new(RefCell::new(None)),
-            next_subpage_id: Untraceable::new(Cell::new(SubpageId(0))),
+            next_subpage_id: Traceable::new(Cell::new(SubpageId(0))),
             resize_event: Untraceable::new(Cell::new(None)),
             fragment_node: Cell::new(None),
             last_reflow_id: Traceable::new(Cell::new(0)),

src/components/util/geometry.rs

@@ -16,6 +16,7 @@ use std::fmt;
 /// One hardware pixel.
 ///
 /// This unit corresponds to the smallest addressable element of the display hardware.
+#[deriving(Encodable)]
 pub enum DevicePixel {}
 
 /// A normalized "pixel" at the default resolution for the display.
@@ -42,6 +43,7 @@ pub enum ScreenPx {}
 ///
 /// At the default zoom level of 100%, one PagePx is equal to one ScreenPx.  However, if the
 /// document is zoomed in or out then this scale may be larger or smaller.
+#[deriving(Encodable)]
 pub enum ViewportPx {}
 
 /// One CSS "px" in the root coordinate system for the content document.
@@ -50,6 +52,7 @@ pub enum ViewportPx {}
 /// This is the mobile-style "pinch zoom" that enlarges content without reflowing it.  When the
 /// viewport zoom is not equal to 1.0, then the layout viewport is no longer the same physical size
 /// as the viewable area.
+#[deriving(Encodable)]
 pub enum PagePx {}
 
 // In summary, the hierarchy of pixel units and the factors to convert from one to the next: