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third_party/polymer/components/web-animations-js/src/tick.js

Index: third_party/polymer/components/web-animations-js/src/tick.js
diff --git a/third_party/polymer/components/web-animations-js/src/tick.js b/third_party/polymer/components/web-animations-js/src/tick.js
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+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//     You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//     See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+(function(shared, scope, testing) {
+  var originalRequestAnimationFrame = window.requestAnimationFrame;
+  var rafCallbacks = [];
+  var rafId = 0;
+  window.requestAnimationFrame = function(f) {
+    var id = rafId++;
+    if (rafCallbacks.length == 0 && !WEB_ANIMATIONS_TESTING) {
+      originalRequestAnimationFrame(processRafCallbacks);
+    }
+    rafCallbacks.push([id, f]);
+    return id;
+  };
+
+  window.cancelAnimationFrame = function(id) {
+    rafCallbacks.forEach(function(entry) {
+      if (entry[0] == id) {
+        entry[1] = function() {};
+      }
+    });
+  };
+
+  function processRafCallbacks(t) {
+    var processing = rafCallbacks;
+    rafCallbacks = [];
+    if (t < timeline.currentTime)
+      t = timeline.currentTime;
+    timeline._animations.sort(compareAnimations);
+    timeline._animations = tick(t, true, timeline._animations)[0];
+    processing.forEach(function(entry) { entry[1](t); });
+    applyPendingEffects();
+    _now = undefined;
+  }
+
+  function compareAnimations(leftAnimation, rightAnimation) {
+    return leftAnimation._sequenceNumber - rightAnimation._sequenceNumber;
+  }
+
+  function InternalTimeline() {
+    this._animations = [];
+    // Android 4.3 browser has window.performance, but not window.performance.now
+    this.currentTime = window.performance && performance.now ? performance.now() : 0;
+  };
+
+  InternalTimeline.prototype = {
+    _play: function(effect) {
+      effect._timing = shared.normalizeTimingInput(effect.timing);
+      var animation = new scope.Animation(effect);
+      animation._idle = false;
+      animation._timeline = this;
+      this._animations.push(animation);
+      scope.restart();
+      scope.applyDirtiedAnimation(animation);
+      return animation;
+    }
+  };
+
+  var _now = undefined;
+
+  if (WEB_ANIMATIONS_TESTING) {
+    var now = function() { return timeline.currentTime; };
+  } else {
+    var now = function() {
+      if (_now == undefined)
+        _now = window.performance && performance.now ? performance.now() : Date.now();
+      return _now;
+    };
+  }
+
+  var ticking = false;
+  var hasRestartedThisFrame = false;
+
+  scope.restart = function() {
+    if (!ticking) {
+      ticking = true;
+      requestAnimationFrame(function() {});
+      hasRestartedThisFrame = true;
+    }
+    return hasRestartedThisFrame;
+  };
+
+  // RAF is supposed to be the last script to occur before frame rendering but not
+  // all browsers behave like this. This function is for synchonously updating an
+  // animation's effects whenever its state is mutated by script to work around
+  // incorrect script execution ordering by the browser.
+  scope.applyDirtiedAnimation = function(animation) {
+    if (inTick) {
+      return;
+    }
+    animation._markTarget();
+    var animations = animation._targetAnimations();
+    animations.sort(compareAnimations);
+    var inactiveAnimations = tick(scope.timeline.currentTime, false, animations.slice())[1];
+    inactiveAnimations.forEach(function(animation) {
+      var index = timeline._animations.indexOf(animation);
+      if (index !== -1) {
+        timeline._animations.splice(index, 1);
+      }
+    });
+    applyPendingEffects();
+  };
+
+  var pendingEffects = [];
+  function applyPendingEffects() {
+    pendingEffects.forEach(function(f) { f(); });
+    pendingEffects.length = 0;
+  }
+
+  var t60hz = 1000 / 60;
+
+  var inTick = false;
+  function tick(t, isAnimationFrame, updatingAnimations) {
+    inTick = true;
+    hasRestartedThisFrame = false;
+    var timeline = scope.timeline;
+
+    timeline.currentTime = t;
+    ticking = false;
+
+    var newPendingClears = [];
+    var newPendingEffects = [];
+    var activeAnimations = [];
+    var inactiveAnimations = [];
+    updatingAnimations.forEach(function(animation) {
+      animation._tick(t, isAnimationFrame);
+
+      if (!animation._inEffect) {
+        newPendingClears.push(animation._effect);
+        animation._unmarkTarget();
+      } else {
+        newPendingEffects.push(animation._effect);
+        animation._markTarget();
+      }
+
+      if (animation._needsTick)
+        ticking = true;
+
+      var alive = animation._inEffect || animation._needsTick;
+      animation._inTimeline = alive;
+      if (alive) {
+        activeAnimations.push(animation);
+      } else {
+        inactiveAnimations.push(animation);
+      }
+    });
+
+    // FIXME: Should remove dupliactes from pendingEffects.
+    pendingEffects.push.apply(pendingEffects, newPendingClears);
+    pendingEffects.push.apply(pendingEffects, newPendingEffects);
+
+    if (ticking)
+      requestAnimationFrame(function() {});
+
+    inTick = false;
+    return [activeAnimations, inactiveAnimations];
+  };
+
+  if (WEB_ANIMATIONS_TESTING) {
+    testing.tick = function(t) { timeline.currentTime = t; processRafCallbacks(t); };
+    testing.isTicking = function() { return ticking; };
+    testing.setTicking = function(newVal) { ticking = newVal; };
+  }
+
+  var timeline = new InternalTimeline();
+  scope.timeline = timeline;
+
+})(webAnimationsShared, webAnimations1, webAnimationsTesting);