Firefox timeline integration #4957

components/devtools/actors/framerate.rs

@@ -0,0 +1,88 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use rustc_serialize::json;
+use std::mem;
+use std::net::TcpStream;
+use time::precise_time_ns;
+
+use actor::{Actor, ActorRegistry};
+
+pub struct FramerateActor {
+    name: String,
+    start_time: Option<u64>,
+    is_recording: bool,
+    ticks: Vec<u64>,
+}
+
+impl Actor for FramerateActor {
+    fn name(&self) -> String {
+        self.name.clone()
+    }
+
+
+    fn handle_message(&self,
+                      _registry: &ActorRegistry,
+                      _msg_type: &str,
+                      _msg: &json::Object,
+                      _stream: &mut TcpStream) -> Result<bool, ()> {
+        Ok(false)
+    }
+}
+
+impl FramerateActor {
+    /// return name of actor
+    pub fn create(registry: &ActorRegistry) -> String {
+        let actor_name = registry.new_name("framerate");
+        let mut actor = FramerateActor {
+            name: actor_name.clone(),
+            start_time: None,
+            is_recording: false,
+            ticks: Vec::new(),
+        };
+
+        actor.start_recording();
+        registry.register_later(box actor);
+        actor_name
+    }
+
+    // callback on request animation frame
+    pub fn on_refresh_driver_tick(&mut self) {
+        if !self.is_recording {
+            return;
+        }
+        // TODO: Need implement requesting animation frame
+        // http://hg.mozilla.org/mozilla-central/file/0a46652bd992/dom/base/nsGlobalWindow.cpp#l5314
+
+        let start_time = self.start_time.as_ref().unwrap();
+        self.ticks.push(*start_time - precise_time_ns());
+    }
+
+    pub fn take_pending_ticks(&mut self) -> Vec<u64> {
+        mem::replace(&mut self.ticks, Vec::new())
+    }
+
+    fn start_recording(&mut self) {
+        self.is_recording = true;
+        self.start_time = Some(precise_time_ns());
+
+        // TODO: Need implement requesting animation frame
+        // http://hg.mozilla.org/mozilla-central/file/0a46652bd992/dom/base/nsGlobalWindow.cpp#l5314
+    }
+
+    fn stop_recording(&mut self) {
+        if !self.is_recording {
+            return;
+        }
+        self.is_recording = false;
+        self.start_time = None;
+    }
+
+}
+
+impl Drop for FramerateActor {
+    fn drop(&mut self) {
+        self.stop_recording();
+    }
+}