cc/resources/resource_pool.h

   1 // Copyright 2012 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 #ifndef CC_RESOURCES_RESOURCE_POOL_H_
   6 #define CC_RESOURCES_RESOURCE_POOL_H_
   7
   8 #include <list>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "cc/base/cc_export.h"
  12 #include "cc/output/renderer.h"
  13 #include "cc/resources/resource.h"
  14 #include "cc/resources/resource_format.h"
  15
  16 namespace cc {
  17 class ScopedResource;
  18
  19 class CC_EXPORT ResourcePool {
  20  public:
  21   static scoped_ptr<ResourcePool> Create(ResourceProvider* resource_provider,
  22                                          GLenum target) {
  23     return make_scoped_ptr(new ResourcePool(resource_provider, target));
  24   }
  25
  26   virtual ~ResourcePool();
  27
  28   scoped_ptr<ScopedResource> AcquireResource(const gfx::Size& size,
  29                                              ResourceFormat format);
  30   void ReleaseResource(scoped_ptr<ScopedResource>);
  31
  32   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
  33                               size_t max_unused_memory_usage_bytes,
  34                               size_t max_resource_count);
  35
  36   void ReduceResourceUsage();
  37   // This might block if |wait_if_needed| is true and one of the currently
  38   // busy resources has a read lock fence that needs to be waited upon before
  39   // it can be locked for write again.
  40   void CheckBusyResources(bool wait_if_needed);
  41
  42   size_t total_memory_usage_bytes() const { return memory_usage_bytes_; }
  43   size_t acquired_memory_usage_bytes() const {
  44     return memory_usage_bytes_ - unused_memory_usage_bytes_;
  45   }
  46   size_t total_resource_count() const { return resource_count_; }
  47   size_t acquired_resource_count() const {
  48     return resource_count_ - unused_resources_.size();
  49   }
  50   size_t busy_resource_count() const { return busy_resources_.size(); }
  51
  52  protected:
  53   ResourcePool(ResourceProvider* resource_provider, GLenum target);
  54
  55   bool ResourceUsageTooHigh();
  56
  57  private:
  58   void DidFinishUsingResource(ScopedResource* resource);
  59
  60   ResourceProvider* resource_provider_;
  61   const GLenum target_;
  62   size_t max_memory_usage_bytes_;
  63   size_t max_unused_memory_usage_bytes_;
  64   size_t max_resource_count_;
  65   size_t memory_usage_bytes_;
  66   size_t unused_memory_usage_bytes_;
  67   size_t resource_count_;
  68
  69   typedef std::list<ScopedResource*> ResourceList;
  70   ResourceList unused_resources_;
  71   ResourceList busy_resources_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
  74 };
  75
  76 }  // namespace cc
  77
  78 #endif  // CC_RESOURCES_RESOURCE_POOL_H_