Add a spinner for layout

src/components/gfx/compositor.rs

@@ -24,9 +24,17 @@ pub struct LayerBufferSet {
     buffers: ~[LayerBuffer]
 }
 
+/// The status of the renderer.
+#[deriving(Eq)]
+pub enum RenderState {
+    IdleRenderState,
+    RenderingRenderState,
+}
+
 /// The interface used to by the renderer to acquire draw targets for each rendered frame and
 /// submit them to be drawn to the display.
 pub trait Compositor {
     fn paint(&self, layer_buffer_set: LayerBufferSet, new_size: Size2D<uint>);
+    fn set_render_state(&self, render_state: RenderState);
 }
 

src/components/gfx/render_task.rs

@@ -5,7 +5,7 @@
 // The task that handles all rendering/painting.
 
 use azure::AzFloat;
-use compositor::Compositor;
+use compositor::{Compositor, IdleRenderState, RenderingRenderState};
 use font_context::FontContext;
 use geom::matrix2d::Matrix2D;
 use opts::Opts;
@@ -122,6 +122,7 @@ impl<C: Compositor + Owned> Renderer<C> {
 
     fn render(&mut self, render_layer: RenderLayer) {
         debug!("renderer: rendering");
+        self.compositor.set_render_state(RenderingRenderState);
         do profile(time::RenderingCategory, self.profiler_chan.clone()) {
             let layer_buffer_set = do render_layers(&render_layer,
                                                     &self.opts,
@@ -168,6 +169,7 @@ impl<C: Compositor + Owned> Renderer<C> {
 
             debug!("renderer: returning surface");
             self.compositor.paint(layer_buffer_set, render_layer.size);
+            self.compositor.set_render_state(IdleRenderState);
         }
     }
 }

src/components/main/compositing/mod.rs

@@ -8,6 +8,7 @@ use script::script_task::{LoadMsg, ScriptMsg, SendEventMsg};
 use windowing::{ApplicationMethods, WindowMethods, WindowMouseEvent, WindowClickEvent};
 use windowing::{WindowMouseDownEvent, WindowMouseUpEvent};
 
+use gfx::compositor::RenderState;
 use script::dom::event::{Event, ClickEvent, MouseDownEvent, MouseUpEvent};
 use script::compositor_interface::{ReadyState, CompositorInterface};
 use script::compositor_interface;
@@ -20,7 +21,7 @@ use core::util;
 use geom::matrix::identity;
 use geom::point::Point2D;
 use geom::size::Size2D;
-use gfx::compositor::{Compositor, LayerBufferSet};
+use gfx::compositor::{Compositor, LayerBufferSet, RenderState};
 use layers::layers::{ARGB32Format, BasicImageData, ContainerLayer, ContainerLayerKind, Format};
 use layers::layers::{Image, ImageData, ImageLayer, ImageLayerKind, RGB24Format, WithDataFn};
 use layers::rendergl;
@@ -39,8 +40,8 @@ pub struct CompositorTask {
 }
 
 impl CompositorInterface for CompositorTask {
-    fn send_compositor_msg(&self, msg: ReadyState) {
-        let msg = ChangeReadyState(msg);
+    fn set_ready_state(&self, ready_state: ReadyState) {
+        let msg = ChangeReadyState(ready_state);
         self.chan.send(msg);
     }
 }
@@ -48,8 +49,7 @@ impl CompositorInterface for CompositorTask {
 impl CompositorTask {
     /// Starts the compositor. Returns an interface that can be used to communicate with the
     /// compositor and a port which allows notification when the compositor shuts down.
-    pub fn new(script_chan: SharedChan<ScriptMsg>,
-               profiler_chan: ProfilerChan)
+    pub fn new(script_chan: SharedChan<ScriptMsg>, profiler_chan: ProfilerChan)
                -> (CompositorTask, Port<()>) {
         let script_chan = Cell(script_chan);
         let (shutdown_port, shutdown_chan) = stream();
@@ -76,8 +76,10 @@ pub enum Msg {
     Exit,
     /// Requests that the compositor paint the given layer buffer set for the given page size.
     Paint(LayerBufferSet, Size2D<uint>),
-    /// Alerts the compositor to the current status of page loading
+    /// Alerts the compositor to the current status of page loading.
     ChangeReadyState(ReadyState),
+    /// Alerts the compositor to the current status of rendering.
+    ChangeRenderState(RenderState),
 }
 
 /// Azure surface wrapping to work with the layers infrastructure.
@@ -151,6 +153,7 @@ fn run_main_loop(port: Port<Msg>,
                 Exit => *done = true,
 
                 ChangeReadyState(ready_state) => window.set_ready_state(ready_state),
+                ChangeRenderState(render_state) => window.set_render_state(render_state),
 
                 Paint(new_layer_buffer_set, new_size) => {
                     debug!("osmain: received new frame");
@@ -356,6 +359,9 @@ impl Compositor for CompositorTask {
     fn paint(&self, layer_buffer_set: LayerBufferSet, new_size: Size2D<uint>) {
         self.chan.send(Paint(layer_buffer_set, new_size))
     }
+    fn set_render_state(&self, render_state: RenderState) {
+        self.chan.send(ChangeRenderState(render_state))
+    }
 }
 
 /// A function for spawning into the platform's main thread.

src/components/main/engine.rs

@@ -78,7 +78,7 @@ impl Engine {
                                               script_chan.take(),
                                               engine_chan_clone.clone(),
                                               |msg: ReadyState| {
-                                                  compositor_clone.send_compositor_msg(msg)
+                                                  compositor_clone.set_ready_state(msg)
                                               },
                                               layout_task.clone(),
                                               resource_task.clone(),

src/components/main/layout/layout_task.rs

@@ -38,7 +38,7 @@ use script::layout_interface::{ContentBoxesQuery, ContentBoxesResponse, ExitMsg,
 use script::layout_interface::{LayoutResponse, LayoutTask, MatchSelectorsDocumentDamage, Msg};
 use script::layout_interface::{QueryMsg, Reflow, ReflowDocumentDamage, ReflowForDisplay};
 use script::layout_interface::{ReflowMsg};
-use script::script_task::{ScriptMsg, SendEventMsg};
+use script::script_task::{ReflowCompleteMsg, ScriptMsg, SendEventMsg};
 use servo_net::image_cache_task::{ImageCacheTask, ImageResponseMsg};
 use servo_net::local_image_cache::LocalImageCache;
 use servo_util::tree::{TreeNodeRef, TreeUtils};
@@ -255,7 +255,11 @@ impl Layout {
         debug!("%?", layout_root.dump());
 
         // Tell script that we're done.
+        //
+        // FIXME(pcwalton): This should probably be *one* channel, but we can't fix this without
+        // either select or a filtered recv() that only looks for messages of a given type.
         data.script_join_chan.send(());
+        data.script_chan.send(ReflowCompleteMsg);
     }
 
     /// Handles a query from the script task. This is the main routine that DOM functions like

src/components/main/platform/common/glut_windowing.rs

@@ -16,10 +16,11 @@ use core::cell::Cell;
 use core::libc::c_int;
 use geom::point::Point2D;
 use geom::size::Size2D;
+use gfx::compositor::{IdleRenderState, RenderState, RenderingRenderState};
 use glut::glut::{ACTIVE_CTRL, DOUBLE, HAVE_PRECISE_MOUSE_WHEEL, WindowHeight, WindowWidth};
 use glut::glut;
 use glut::machack;
-use script::compositor_interface::{FinishedLoading, Loading, Rendering, ReadyState};
+use script::compositor_interface::{FinishedLoading, Loading, PerformingLayout, ReadyState};
 
 static THROBBER: [char, ..8] = [ '⣾', '⣽', '⣻', '⢿', '⡿', '⣟', '⣯', '⣷' ];
 
@@ -51,6 +52,7 @@ pub struct Window {
     mouse_down_point: @mut Point2D<c_int>,
 
     ready_state: ReadyState,
+    render_state: RenderState,
     throbber_frame: u8,
 }
 
@@ -78,6 +80,7 @@ impl WindowMethods<Application> for Window {
             mouse_down_point: @mut Point2D(0, 0),
 
             ready_state: FinishedLoading,
+            render_state: IdleRenderState,
             throbber_frame: 0,
         };
 
@@ -190,6 +193,12 @@ impl WindowMethods<Application> for Window {
         self.ready_state = ready_state;
         self.update_window_title()
     }
+
+    /// Sets the render state.
+    pub fn set_render_state(@mut self, render_state: RenderState) {
+        self.render_state = render_state;
+        self.update_window_title()
+    }
 }
 
 impl Window {
@@ -200,10 +209,19 @@ impl Window {
             Loading => {
                 glut::set_window_title(self.glut_window, fmt!("%c Loading — Servo", throbber))
             }
-            Rendering => {
-                glut::set_window_title(self.glut_window, fmt!("%c Rendering — Servo", throbber))
+            PerformingLayout => {
+                glut::set_window_title(self.glut_window,
+                                       fmt!("%c Performing Layout — Servo", throbber))
+            }
+            FinishedLoading => {
+                match self.render_state {
+                    RenderingRenderState => {
+                        glut::set_window_title(self.glut_window,
+                                               fmt!("%c Rendering — Servo", throbber))
+                    }
+                    IdleRenderState => glut::set_window_title(self.glut_window, "Servo"),
+                }
             }
-            FinishedLoading => glut::set_window_title(self.glut_window, "Servo"),
         }
     }
 

src/components/main/windowing.rs

@@ -6,6 +6,7 @@
 
 use geom::point::Point2D;
 use geom::size::Size2D;
+use gfx::compositor::RenderState;
 use script::compositor_interface::ReadyState;
 
 pub enum WindowMouseEvent {
@@ -64,5 +65,7 @@ pub trait WindowMethods<A> {
     pub fn set_needs_display(@mut self);
     /// Sets the ready state of the current page.
     pub fn set_ready_state(@mut self, ready_state: ReadyState);
+    /// Sets the render state of the current page.
+    pub fn set_render_state(@mut self, render_state: RenderState);
 }
 

src/components/script/compositor_interface.rs

@@ -8,12 +8,12 @@
 pub enum ReadyState {
     /// Informs the compositor that a page is loading. Used for setting status
     Loading,
-    /// Informs the compositor that a page is rendering. Used for setting status
-    Rendering,
+    /// Informs the compositor that a page is performing layout. Used for setting status
+    PerformingLayout,
     /// Informs the compositor that a page is finished loading. Used for setting status
     FinishedLoading,
 }
 
 pub trait CompositorInterface : Clone {
-    fn send_compositor_msg(&self, ReadyState);
+    fn set_ready_state(&self, ReadyState);
 }

src/components/script/script_task.rs

@@ -5,7 +5,7 @@
 /// The script task is the task that owns the DOM in memory, runs JavaScript, and spawns parsing
 /// and layout tasks.
 
-use compositor_interface::{ReadyState, Loading, Rendering, FinishedLoading};
+use compositor_interface::{ReadyState, Loading, PerformingLayout, FinishedLoading};
 use dom::bindings::utils::GlobalStaticData;
 use dom::document::Document;
 use dom::element::Element;
@@ -54,6 +54,8 @@ pub enum ScriptMsg {
     SendEventMsg(Event),
     /// Fires a JavaScript timeout.
     FireTimerMsg(~TimerData),
+    /// Notifies script that reflow is finished.
+    ReflowCompleteMsg,
     /// Exits the engine.
     ExitMsg,
 }
@@ -262,6 +264,10 @@ impl ScriptContext {
                 self.handle_fire_timer_msg(timer_data);
                 true
             }
+            ReflowCompleteMsg => {
+                self.handle_reflow_complete_msg();
+                true
+            }
             ExitMsg => {
                 self.handle_exit_msg();
                 false
@@ -306,6 +312,12 @@ impl ScriptContext {
         self.reflow(ReflowForScriptQuery)
     }
 
+    /// Handles a notification that reflow completed.
+    fn handle_reflow_complete_msg(&mut self) {
+        self.layout_join_port = None;
+        self.set_ready_state(FinishedLoading)
+    }
+
     /// Handles a request to exit the script task and shut down layout.
     fn handle_exit_msg(&mut self) {
         self.join_layout();
@@ -318,7 +330,7 @@ impl ScriptContext {
 
     // tells the compositor when loading starts and finishes
     // FIXME ~compositor_interface doesn't work right now, which is why this is necessary
-    fn send_compositor_msg(&self, msg: ReadyState) {
+    fn set_ready_state(&self, msg: ReadyState) {
         (self.compositor_task)(msg);
     }
 
@@ -333,7 +345,7 @@ impl ScriptContext {
             self.bindings_initialized = true
         }
 
-        self.send_compositor_msg(Loading);
+        self.set_ready_state(Loading);
         // Parse HTML.
         //
         // Note: We can parse the next document in parallel with any previous documents.
@@ -374,7 +386,6 @@ impl ScriptContext {
             url: url
         });
 
-        self.send_compositor_msg(Rendering);
         // Perform the initial reflow.
         self.damage = Some(DocumentDamage {
             root: root_node,
@@ -392,7 +403,6 @@ impl ScriptContext {
                                                     ~"???",
                                                     1);
         }
-        self.send_compositor_msg(FinishedLoading);
     }
 
     /// Sends a ping to layout and waits for the response. The response will arrive when the
@@ -426,6 +436,9 @@ impl ScriptContext {
         // Now, join the layout so that they will see the latest changes we have made.
         self.join_layout();
 
+        // Tell the user that we're performing layout.
+        self.set_ready_state(PerformingLayout);
+
         // Layout will let us know when it's done.
         let (join_port, join_chan) = comm::stream();
         self.layout_join_port = Some(join_port);
@@ -438,8 +451,8 @@ impl ScriptContext {
                     document_root: root_frame.document.root,
                     url: copy root_frame.url,
                     goal: goal,
-                    script_chan: self.script_chan.clone(),
                     window_size: self.window_size,
+                    script_chan: self.script_chan.clone(),
                     script_join_chan: join_chan,
                     damage: replace(&mut self.damage, None).unwrap(),
                 };