Setup a experiment to enable background tracing.
[chromium-blink-merge.git] / cc / surfaces / surface_resource_holder.cc
blobc257b6082eb9cd83a1795e3eee754e32dc38b208
1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "cc/surfaces/surface_resource_holder.h"
7 #include "cc/surfaces/surface_factory_client.h"
9 namespace cc {
11 SurfaceResourceHolder::SurfaceResourceHolder(SurfaceFactoryClient* client)
12 : client_(client) {
15 SurfaceResourceHolder::~SurfaceResourceHolder() {
18 SurfaceResourceHolder::ResourceRefs::ResourceRefs()
19 : refs_received_from_child(0), refs_holding_resource_alive(0) {
22 void SurfaceResourceHolder::ReceiveFromChild(
23 const TransferableResourceArray& resources) {
24 for (TransferableResourceArray::const_iterator it = resources.begin();
25 it != resources.end();
26 ++it) {
27 ResourceRefs& ref = resource_id_use_count_map_[it->id];
28 ref.refs_holding_resource_alive++;
29 ref.refs_received_from_child++;
33 void SurfaceResourceHolder::RefResources(
34 const TransferableResourceArray& resources) {
35 for (TransferableResourceArray::const_iterator it = resources.begin();
36 it != resources.end();
37 ++it) {
38 ResourceIdCountMap::iterator count_it =
39 resource_id_use_count_map_.find(it->id);
40 DCHECK(count_it != resource_id_use_count_map_.end());
41 count_it->second.refs_holding_resource_alive++;
45 void SurfaceResourceHolder::UnrefResources(
46 const ReturnedResourceArray& resources) {
47 ReturnedResourceArray resources_available_to_return;
49 for (ReturnedResourceArray::const_iterator it = resources.begin();
50 it != resources.end();
51 ++it) {
52 unsigned id = it->id;
53 ResourceIdCountMap::iterator count_it = resource_id_use_count_map_.find(id);
54 if (count_it == resource_id_use_count_map_.end())
55 continue;
56 ResourceRefs& ref = count_it->second;
57 ref.refs_holding_resource_alive -= it->count;
58 if (ref.refs_holding_resource_alive == 0) {
59 ReturnedResource returned = *it;
60 returned.count = ref.refs_received_from_child;
61 resources_available_to_return.push_back(returned);
62 resource_id_use_count_map_.erase(count_it);
66 client_->ReturnResources(resources_available_to_return);
69 } // namespace cc