cc/layers/delegated_frame_resource_collection.cc

   1 // Copyright 2013 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/layers/delegated_frame_resource_collection.h"
   6
   7 #include "base/bind.h"
   8 #include "cc/trees/blocking_task_runner.h"
   9
  10 namespace cc {
  11
  12 DelegatedFrameResourceCollection::DelegatedFrameResourceCollection()
  13     : client_(NULL),
  14       main_thread_runner_(BlockingTaskRunner::current()),
  15       lost_all_resources_(false),
  16       weak_ptr_factory_(this) {
  17   DCHECK(main_thread_checker_.CalledOnValidThread());
  18 }
  19
  20 DelegatedFrameResourceCollection::~DelegatedFrameResourceCollection() {
  21   DCHECK(main_thread_checker_.CalledOnValidThread());
  22 }
  23
  24 void DelegatedFrameResourceCollection::SetClient(
  25     DelegatedFrameResourceCollectionClient* client) {
  26   client_ = client;
  27 }
  28
  29 void DelegatedFrameResourceCollection::TakeUnusedResourcesForChildCompositor(
  30     ReturnedResourceArray* array) {
  31   DCHECK(main_thread_checker_.CalledOnValidThread());
  32   DCHECK(array->empty());
  33   array->swap(returned_resources_for_child_compositor_);
  34 }
  35
  36 bool DelegatedFrameResourceCollection::LoseAllResources() {
  37   DCHECK(main_thread_checker_.CalledOnValidThread());
  38   DCHECK(!lost_all_resources_);
  39   lost_all_resources_ = true;
  40
  41   if (resource_id_ref_count_map_.empty())
  42     return false;
  43
  44   ReturnedResourceArray to_return;
  45
  46   for (ResourceIdRefCountMap::iterator it = resource_id_ref_count_map_.begin();
  47        it != resource_id_ref_count_map_.end();
  48        ++it) {
  49     DCHECK_GE(it->second.refs_to_wait_for, 1);
  50
  51     ReturnedResource returned;
  52     returned.id = it->first;
  53     returned.count = it->second.refs_to_return;
  54     returned.lost = true;
  55     to_return.push_back(returned);
  56   }
  57
  58   returned_resources_for_child_compositor_.insert(
  59       returned_resources_for_child_compositor_.end(),
  60       to_return.begin(),
  61       to_return.end());
  62   if (client_)
  63     client_->UnusedResourcesAreAvailable();
  64   return true;
  65 }
  66
  67 void DelegatedFrameResourceCollection::ReceivedResources(
  68     const TransferableResourceArray& resources) {
  69   DCHECK(main_thread_checker_.CalledOnValidThread());
  70   DCHECK(!lost_all_resources_);
  71
  72   for (size_t i = 0; i < resources.size(); ++i)
  73     resource_id_ref_count_map_[resources[i].id].refs_to_return++;
  74 }
  75
  76 void DelegatedFrameResourceCollection::UnrefResources(
  77     const ReturnedResourceArray& returned) {
  78   DCHECK(main_thread_checker_.CalledOnValidThread());
  79
  80   if (lost_all_resources_)
  81     return;
  82
  83   ReturnedResourceArray to_return;
  84
  85   for (size_t i = 0; i < returned.size(); ++i) {
  86     ResourceIdRefCountMap::iterator it =
  87         resource_id_ref_count_map_.find(returned[i].id);
  88     DCHECK(it != resource_id_ref_count_map_.end());
  89     DCHECK_GE(it->second.refs_to_wait_for, returned[i].count);
  90     it->second.refs_to_wait_for -= returned[i].count;
  91     if (it->second.refs_to_wait_for == 0) {
  92       to_return.push_back(returned[i]);
  93       to_return.back().count = it->second.refs_to_return;
  94       resource_id_ref_count_map_.erase(it);
  95     }
  96   }
  97
  98   if (to_return.empty())
  99     return;
 100
 101   returned_resources_for_child_compositor_.insert(
 102       returned_resources_for_child_compositor_.end(),
 103       to_return.begin(),
 104       to_return.end());
 105   if (client_)
 106     client_->UnusedResourcesAreAvailable();
 107 }
 108
 109 void DelegatedFrameResourceCollection::RefResources(
 110     const TransferableResourceArray& resources) {
 111   DCHECK(main_thread_checker_.CalledOnValidThread());
 112   for (size_t i = 0; i < resources.size(); ++i)
 113     resource_id_ref_count_map_[resources[i].id].refs_to_wait_for++;
 114 }
 115
 116 static void UnrefResourcesOnImplThread(
 117     base::WeakPtr<DelegatedFrameResourceCollection> self,
 118     scoped_refptr<BlockingTaskRunner> main_thread_runner,
 119     const ReturnedResourceArray& returned) {
 120   main_thread_runner->PostTask(
 121       FROM_HERE,
 122       base::Bind(
 123           &DelegatedFrameResourceCollection::UnrefResources, self, returned));
 124 }
 125
 126 ReturnCallback
 127 DelegatedFrameResourceCollection::GetReturnResourcesCallbackForImplThread() {
 128   return base::Bind(&UnrefResourcesOnImplThread,
 129                     weak_ptr_factory_.GetWeakPtr(),
 130                     main_thread_runner_);
 131 }
 132
 133 }  // namespace cc