CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/animation/animation_timeline.cc

+// 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() {
+  return make_scoped_refptr(new AnimationTimeline());
+}
+
+AnimationTimeline::AnimationTimeline() : layer_tree_mutators_client_() {
+}
+
+AnimationTimeline::~AnimationTimeline() {
+  DCHECK(!layer_tree_mutators_client());
+  for (auto& player : players_)
+    player->SetAnimationTimeline(nullptr);
+}
+
+void AnimationTimeline::AttachPlayer(AnimationPlayer* player) {
+  player->SetAnimationTimeline(this);
+  players_.push_back(player);
+}
+
+void AnimationTimeline::DetachPlayer(AnimationPlayer* player) {
+  for (AnimationPlayerList::iterator iter = players_.begin();
+       iter != players_.end(); ++iter) {
+    if (iter->get() != player)
+      continue;
+
+    players_.erase(iter);
+    player->SetAnimationTimeline(nullptr);
+    break;
+  }
+}
+
+AnimationPlayer* AnimationTimeline::GetPlayerById(int player_id) const {
+  for (auto& player : players_)
+    if (player->id() == player_id)
+      return player.get();
+  return nullptr;
+}
+
+void AnimationTimeline::RegisterLayerImpl(int layer_id, bool is_active_tree) {
+  AnimationPlayer* player = GetPlayerForLayerId(layer_id);
+  if (player)
+    player->LayerImplRegistered(layer_id, is_active_tree);
+}
+
+void AnimationTimeline::UnregisterLayerImpl(int layer_id, bool is_active_tree) {
+  AnimationPlayer* player = GetPlayerForLayerId(layer_id);
+  if (player)
+    player->LayerImplUnregistered(layer_id, is_active_tree);
+}
+
+void AnimationTimeline::RegisterPlayerForLayer(int layer_id,
+                                               AnimationPlayer* player) {
+  DCHECK(layer_id);
+  DCHECK(player);
+  layer_to_player_map_[layer_id] = player;
+}
+
+void AnimationTimeline::UnregisterPlayerForLayer(int layer_id,
+                                                 AnimationPlayer* player) {
+  DCHECK(layer_id);
+  DCHECK(player);
+  auto iter = layer_to_player_map_.find(layer_id);
+  if (iter != layer_to_player_map_.end() && iter->second == player)
+    layer_to_player_map_.erase(iter);
+}
+
+void AnimationTimeline::SetLayerTreeMutatorsClient(
+    LayerTreeMutatorsClient* client) {
+  if (layer_tree_mutators_client_ == client)
+    return;
+
+  layer_tree_mutators_client_ = client;
+}
+
+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());
+                     });
+
+  for (auto i = to_erase; i != players_impl.end(); ++i) {
+    auto& player_impl = *i;
+    if (player_impl->layer_animation_controller())
+      player_impl->DetachLayer();
+    player_impl->SetAnimationTimeline(nullptr);
+  }
+
+  players_impl.erase(to_erase, players_impl.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);
+  }
+}
+
+AnimationPlayer* AnimationTimeline::GetPlayerForLayerId(int layer_id) const {
+  DCHECK(layer_id);
+  auto iter = layer_to_player_map_.find(layer_id);
+  return iter == layer_to_player_map_.end() ? nullptr : iter->second;
+}
+
+}  // namespace cc