cc: Move UI Resource management out of LayerTreeHost.

cc/resources/ui_resource_manager.cc

+// Copyright 2016 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 <algorithm>
+
+#include "cc/resources/ui_resource_manager.h"
+
+namespace cc {
+
+UIResourceManager::UIResourceManager() : next_ui_resource_id_(1) {}
+
+UIResourceManager::~UIResourceManager() = default;
+
+UIResourceId UIResourceManager::CreateUIResource(UIResourceClient* client) {
+  DCHECK(client);
+
+  UIResourceId next_id = next_ui_resource_id_++;
+  DCHECK(ui_resource_client_map_.find(next_id) ==
+         ui_resource_client_map_.end());
+
+  bool resource_lost = false;
+  UIResourceRequest request(UIResourceRequest::UI_RESOURCE_CREATE, next_id,
+                            client->GetBitmap(next_id, resource_lost));
+  ui_resource_request_queue_.push_back(request);
+
+  UIResourceClientData data;
+  data.client = client;
+  data.size = request.GetBitmap().GetSize();
+
+  ui_resource_client_map_[request.GetId()] = data;
+  return request.GetId();
+}
+
+void UIResourceManager::DeleteUIResource(UIResourceId uid) {
+  UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);
+  if (iter == ui_resource_client_map_.end())
+    return;
+
+  UIResourceRequest request(UIResourceRequest::UI_RESOURCE_DELETE, uid);
+  ui_resource_request_queue_.push_back(request);
+  ui_resource_client_map_.erase(iter);
+}
+
+void UIResourceManager::RecreateUIResources() {
+  for (UIResourceClientMap::iterator iter = ui_resource_client_map_.begin();
+       iter != ui_resource_client_map_.end(); ++iter) {
+    UIResourceId uid = iter->first;
+    const UIResourceClientData& data = iter->second;
+    bool resource_lost = true;
+    auto it = std::find_if(ui_resource_request_queue_.begin(),
+                           ui_resource_request_queue_.end(),
+                           [uid](const UIResourceRequest& request) {
+                             return request.GetId() == uid;
+                           });
+    if (it == ui_resource_request_queue_.end()) {
+      UIResourceRequest request(UIResourceRequest::UI_RESOURCE_CREATE, uid,
+                                data.client->GetBitmap(uid, resource_lost));
+      ui_resource_request_queue_.push_back(request);
+    }
+  }
+}
+
+gfx::Size UIResourceManager::GetUIResourceSize(UIResourceId uid) const {
+  UIResourceClientMap::const_iterator iter = ui_resource_client_map_.find(uid);
+  if (iter == ui_resource_client_map_.end())
+    return gfx::Size();
+
+  const UIResourceClientData& data = iter->second;
+  return data.size;
+}
+
+std::vector<UIResourceRequest> UIResourceManager::TakeUIResourcesRequests() {
+  UIResourceRequestQueue result;
+  result.swap(ui_resource_request_queue_);
+  return result;
+}
+
+}  // namespace cc