| // Copyright 2012 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/resources/resource_pool.h" |
| |
| #include "cc/resources/resource_provider.h" |
| #include "cc/resources/scoped_resource.h" |
| |
| namespace cc { |
| |
| ResourcePool::ResourcePool(ResourceProvider* resource_provider, |
| GLenum target, |
| ResourceFormat format) |
| : resource_provider_(resource_provider), |
| target_(target), |
| format_(format), |
| max_memory_usage_bytes_(0), |
| max_unused_memory_usage_bytes_(0), |
| max_resource_count_(0), |
| memory_usage_bytes_(0), |
| unused_memory_usage_bytes_(0), |
| resource_count_(0) {} |
| |
| ResourcePool::~ResourcePool() { |
| while (!busy_resources_.empty()) { |
| DidFinishUsingResource(busy_resources_.front()); |
| busy_resources_.pop_front(); |
| } |
| |
| SetResourceUsageLimits(0, 0, 0); |
| DCHECK_EQ(0u, unused_resources_.size()); |
| DCHECK_EQ(0u, memory_usage_bytes_); |
| DCHECK_EQ(0u, unused_memory_usage_bytes_); |
| DCHECK_EQ(0u, resource_count_); |
| } |
| |
| scoped_ptr<ScopedResource> ResourcePool::AcquireResource( |
| const gfx::Size& size) { |
| for (ResourceList::iterator it = unused_resources_.begin(); |
| it != unused_resources_.end(); |
| ++it) { |
| ScopedResource* resource = *it; |
| DCHECK(resource_provider_->CanLockForWrite(resource->id())); |
| |
| if (resource->size() != size) |
| continue; |
| |
| unused_resources_.erase(it); |
| unused_memory_usage_bytes_ -= resource->bytes(); |
| return make_scoped_ptr(resource); |
| } |
| |
| scoped_ptr<ScopedResource> resource = |
| ScopedResource::Create(resource_provider_); |
| resource->AllocateManaged(size, target_, format_); |
| |
| memory_usage_bytes_ += resource->bytes(); |
| ++resource_count_; |
| return resource.Pass(); |
| } |
| |
| void ResourcePool::ReleaseResource(scoped_ptr<ScopedResource> resource) { |
| busy_resources_.push_back(resource.release()); |
| } |
| |
| void ResourcePool::SetResourceUsageLimits(size_t max_memory_usage_bytes, |
| size_t max_unused_memory_usage_bytes, |
| size_t max_resource_count) { |
| max_memory_usage_bytes_ = max_memory_usage_bytes; |
| max_unused_memory_usage_bytes_ = max_unused_memory_usage_bytes; |
| max_resource_count_ = max_resource_count; |
| |
| ReduceResourceUsage(); |
| } |
| |
| void ResourcePool::ReduceResourceUsage() { |
| while (!unused_resources_.empty()) { |
| if (!ResourceUsageTooHigh()) |
| break; |
| |
| // LRU eviction pattern. Most recently used might be blocked by |
| // a read lock fence but it's still better to evict the least |
| // recently used as it prevents a resource that is hard to reuse |
| // because of unique size from being kept around. Resources that |
| // can't be locked for write might also not be truly free-able. |
| // We can free the resource here but it doesn't mean that the |
| // memory is necessarily returned to the OS. |
| ScopedResource* resource = unused_resources_.front(); |
| unused_resources_.pop_front(); |
| memory_usage_bytes_ -= resource->bytes(); |
| unused_memory_usage_bytes_ -= resource->bytes(); |
| --resource_count_; |
| delete resource; |
| } |
| } |
| |
| bool ResourcePool::ResourceUsageTooHigh() { |
| if (resource_count_ > max_resource_count_) |
| return true; |
| if (memory_usage_bytes_ > max_memory_usage_bytes_) |
| return true; |
| if (unused_memory_usage_bytes_ > max_unused_memory_usage_bytes_) |
| return true; |
| return false; |
| } |
| |
| void ResourcePool::CheckBusyResources(bool wait_if_needed) { |
| ResourceList::iterator it = busy_resources_.begin(); |
| |
| while (it != busy_resources_.end()) { |
| ScopedResource* resource = *it; |
| |
| if (wait_if_needed) |
| resource_provider_->WaitReadLockIfNeeded(resource->id()); |
| |
| if (resource_provider_->CanLockForWrite(resource->id())) { |
| DidFinishUsingResource(resource); |
| it = busy_resources_.erase(it); |
| } else { |
| ++it; |
| } |
| } |
| } |
| |
| void ResourcePool::DidFinishUsingResource(ScopedResource* resource) { |
| unused_memory_usage_bytes_ += resource->bytes(); |
| unused_resources_.push_back(resource); |
| } |
| |
| } // namespace cc |