cc/surfaces/surface_resource_holder.cc

   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.
   4
   5 #include "cc/surfaces/surface_resource_holder.h"
   6
   7 #include "cc/surfaces/surface_factory_client.h"
   8
   9 namespace cc {
  10
  11 SurfaceResourceHolder::SurfaceResourceHolder(SurfaceFactoryClient* client)
  12     : client_(client) {
  13 }
  14
  15 SurfaceResourceHolder::~SurfaceResourceHolder() {
  16 }
  17
  18 SurfaceResourceHolder::ResourceRefs::ResourceRefs()
  19     : refs_received_from_child(0), refs_holding_resource_alive(0) {
  20 }
  21
  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++;
  30   }
  31 }
  32
  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++;
  42   }
  43 }
  44
  45 void SurfaceResourceHolder::UnrefResources(
  46     const ReturnedResourceArray& resources) {
  47   ReturnedResourceArray resources_available_to_return;
  48
  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);
  63     }
  64   }
  65
  66   client_->ReturnResources(resources_available_to_return);
  67 }
  68
  69 }  // namespace cc