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 <deque>
   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   scoped_ptr<ScopedResource> TryAcquireResourceWithContentId(uint64 content_id);
  31   void ReleaseResource(scoped_ptr<ScopedResource> resource,
  32                        uint64_t content_id);
  33
  34   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
  35                               size_t max_unused_memory_usage_bytes,
  36                               size_t max_resource_count);
  37
  38   void ReduceResourceUsage();
  39   // This might block if |wait_if_needed| is true and one of the currently
  40   // busy resources has a read lock fence that needs to be waited upon before
  41   // it can be locked for write again.
  42   void CheckBusyResources(bool wait_if_needed);
  43
  44   size_t total_memory_usage_bytes() const { return memory_usage_bytes_; }
  45   size_t acquired_memory_usage_bytes() const {
  46     return memory_usage_bytes_ - unused_memory_usage_bytes_;
  47   }
  48   size_t total_resource_count() const { return resource_count_; }
  49   size_t acquired_resource_count() const {
  50     return resource_count_ - unused_resources_.size();
  51   }
  52   size_t busy_resource_count() const { return busy_resources_.size(); }
  53
  54  protected:
  55   ResourcePool(ResourceProvider* resource_provider, GLenum target);
  56
  57   bool ResourceUsageTooHigh();
  58
  59  private:
  60   void DidFinishUsingResource(ScopedResource* resource, uint64_t content_id);
  61
  62   ResourceProvider* resource_provider_;
  63   const GLenum target_;
  64   size_t max_memory_usage_bytes_;
  65   size_t max_unused_memory_usage_bytes_;
  66   size_t max_resource_count_;
  67   size_t memory_usage_bytes_;
  68   size_t unused_memory_usage_bytes_;
  69   size_t resource_count_;
  70
  71   struct PoolResource {
  72     PoolResource(ScopedResource* resource, uint64_t content_id)
  73         : resource(resource), content_id(content_id) {}
  74     ScopedResource* resource;
  75     uint64_t content_id;
  76   };
  77   typedef std::deque<PoolResource> ResourceList;
  78   ResourceList unused_resources_;
  79   ResourceList busy_resources_;
  80
  81   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
  82 };
  83
  84 }  // namespace cc
  85
  86 #endif  // CC_RESOURCES_RESOURCE_POOL_H_