CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/animation/animation_timeline.cc

Index: cc/animation/animation_timeline.cc
diff --git a/cc/animation/animation_timeline.cc b/cc/animation/animation_timeline.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9d19f8fbe0be53284056059c0023f473cc24e16d
--- /dev/null
+++ b/cc/animation/animation_timeline.cc
@@ -0,0 +1,120 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/animation/animation_timeline.h"
+
+#include <algorithm>
+
+#include "cc/animation/animation_player.h"
+
+namespace cc {
+
+scoped_refptr<AnimationTimeline> AnimationTimeline::Create(int id) {
+  return make_scoped_refptr(new AnimationTimeline(id));
+}
+
+AnimationTimeline::AnimationTimeline(int id)
+    : id_(id), animation_host_(), is_impl_only_(false) {
+}
+
+AnimationTimeline::~AnimationTimeline() {
+  for (auto& player : players_)
+    player->SetAnimationTimeline(nullptr);
+}
+
+scoped_refptr<AnimationTimeline> AnimationTimeline::CreateImplInstance() const {
+  scoped_refptr<AnimationTimeline> timeline = AnimationTimeline::Create(id());
+  return timeline;
+}
+
+void AnimationTimeline::SetAnimationHost(AnimationHost* animation_host) {
+  animation_host_ = animation_host;
+  for (auto& player : players_)
+    player->SetAnimationHost(animation_host);
+}
+
+void AnimationTimeline::AttachPlayer(scoped_refptr<AnimationPlayer> player) {
+  DCHECK(animation_host_);
+  player->SetAnimationHost(animation_host_);
+  player->SetAnimationTimeline(this);
+  players_.push_back(player);
+}
+
+void AnimationTimeline::DetachPlayer(scoped_refptr<AnimationPlayer> player) {
+  for (AnimationPlayerList::iterator iter = players_.begin();
+       iter != players_.end(); ++iter) {
+    if (iter->get() != player)
+      continue;
+
+    ErasePlayers(iter, iter + 1);
+    break;
+  }
+
+  player->SetAnimationHost(nullptr);
+}
+
+AnimationPlayer* AnimationTimeline::GetPlayerById(int player_id) const {
+  for (auto& player : players_)
+    if (player->id() == player_id)
+      return player.get();
+  return nullptr;
+}
+
+void AnimationTimeline::ClearPlayers() {
+  ErasePlayers(players_.begin(), players_.end());
+}
+
+void AnimationTimeline::PushPropertiesTo(AnimationTimeline* timeline_impl) {
+  PushAttachedPlayersToImplThread(timeline_impl);
+  RemoveDetachedPlayersFromImplThread(timeline_impl);
+  PushPropertiesToImplThread(timeline_impl);
+}
+
+void AnimationTimeline::PushAttachedPlayersToImplThread(
+    AnimationTimeline* timeline_impl) const {
+  for (auto& player : players_) {
+    AnimationPlayer* player_impl = timeline_impl->GetPlayerById(player->id());
+    if (player_impl)
+      continue;
+
+    scoped_refptr<AnimationPlayer> to_add = player->CreateImplInstance();
+    timeline_impl->AttachPlayer(to_add.get());
+  }
+}
+
+void AnimationTimeline::RemoveDetachedPlayersFromImplThread(
+    AnimationTimeline* timeline_impl) const {
+  AnimationPlayerList& players_impl = timeline_impl->players_;
+
+  auto to_erase =
+      std::partition(players_impl.begin(), players_impl.end(),
+                     [this](AnimationPlayerList::value_type player_impl) {
+                       return GetPlayerById(player_impl->id());
+                     });
+
+  timeline_impl->ErasePlayers(to_erase, players_impl.end());
+}
+
+void AnimationTimeline::ErasePlayers(AnimationPlayerList::iterator begin,
+                                     AnimationPlayerList::iterator end) {
+  for (auto i = begin; i != end; ++i) {
+    auto& player = *i;
+    if (player->element_animations())
+      player->DetachLayer();
+    player->SetAnimationTimeline(nullptr);
+  }
+
+  players_.erase(begin, end);
+}
+
+void AnimationTimeline::PushPropertiesToImplThread(
+    AnimationTimeline* timeline_impl) {
+  for (auto& player : players_) {
+    AnimationPlayer* player_impl = timeline_impl->GetPlayerById(player->id());
+    if (player_impl)
+      player->PushPropertiesTo(player_impl);
+  }
+}
+
+}  // namespace cc