Revert "Delete CC."

cc/resources/resource_pool.h

+// 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.
+
+#ifndef CC_RESOURCES_RESOURCE_POOL_H_
+#define CC_RESOURCES_RESOURCE_POOL_H_
+
+#include <list>
+
+#include "base/memory/scoped_ptr.h"
+#include "cc/output/renderer.h"
+#include "cc/resources/resource.h"
+#include "cc/resources/resource_format.h"
+
+namespace cc {
+class ScopedResource;
+
+class ResourcePool {
+ public:
+  static scoped_ptr<ResourcePool> Create(ResourceProvider* resource_provider,
+                                         GLenum target) {
+    return make_scoped_ptr(new ResourcePool(resource_provider, target));
+  }
+
+  virtual ~ResourcePool();
+
+  scoped_ptr<ScopedResource> AcquireResource(const gfx::Size& size,
+                                             ResourceFormat format);
+  void ReleaseResource(scoped_ptr<ScopedResource>);
+
+  void SetResourceUsageLimits(size_t max_memory_usage_bytes,
+                              size_t max_unused_memory_usage_bytes,
+                              size_t max_resource_count);
+
+  void ReduceResourceUsage();
+  // This might block if |wait_if_needed| is true and one of the currently
+  // busy resources has a read lock fence that needs to be waited upon before
+  // it can be locked for write again.
+  void CheckBusyResources(bool wait_if_needed);
+
+  size_t total_memory_usage_bytes() const { return memory_usage_bytes_; }
+  size_t acquired_memory_usage_bytes() const {
+    return memory_usage_bytes_ - unused_memory_usage_bytes_;
+  }
+  size_t total_resource_count() const { return resource_count_; }
+  size_t acquired_resource_count() const {
+    return resource_count_ - unused_resources_.size();
+  }
+  size_t busy_resource_count() const { return busy_resources_.size(); }
+
+ protected:
+  ResourcePool(ResourceProvider* resource_provider, GLenum target);
+
+  bool ResourceUsageTooHigh();
+
+ private:
+  void DidFinishUsingResource(ScopedResource* resource);
+
+  ResourceProvider* resource_provider_;
+  const GLenum target_;
+  size_t max_memory_usage_bytes_;
+  size_t max_unused_memory_usage_bytes_;
+  size_t max_resource_count_;
+  size_t memory_usage_bytes_;
+  size_t unused_memory_usage_bytes_;
+  size_t resource_count_;
+
+  typedef std::list<ScopedResource*> ResourceList;
+  ResourceList unused_resources_;
+  ResourceList busy_resources_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResourcePool);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RESOURCE_POOL_H_