src/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
  18 class CC_EXPORT ResourcePool {
  19  public:
  20   class CC_EXPORT Resource : public cc::Resource {
  21    public:
  22     Resource(ResourceProvider* resource_provider,
  23              gfx::Size size,
  24              ResourceFormat format);
  25     ~Resource();
  26
  27    private:
  28     ResourceProvider* resource_provider_;
  29
  30     DISALLOW_COPY_AND_ASSIGN(Resource);
  31   };
  32
  33   static scoped_ptr<ResourcePool> Create(ResourceProvider* resource_provider) {
  34     return make_scoped_ptr(new ResourcePool(resource_provider));
  35   }
  36
  37   virtual ~ResourcePool();
  38
  39   scoped_ptr<ResourcePool::Resource> AcquireResource(
  40       gfx::Size size, ResourceFormat format);
  41   void ReleaseResource(scoped_ptr<ResourcePool::Resource>);
  42
  43   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
  44                               size_t max_unused_memory_usage_bytes,
  45                               size_t max_resource_count);
  46
  47   void ReduceResourceUsage();
  48
  49   size_t total_memory_usage_bytes() const {
  50     return memory_usage_bytes_;
  51   }
  52   size_t acquired_memory_usage_bytes() const {
  53     return memory_usage_bytes_ - unused_memory_usage_bytes_;
  54   }
  55   size_t acquired_resource_count() const {
  56     return resource_count_ - unused_resources_.size();
  57   }
  58
  59  protected:
  60   explicit ResourcePool(ResourceProvider* resource_provider);
  61
  62   bool ResourceUsageTooHigh();
  63
  64  private:
  65   ResourceProvider* resource_provider_;
  66   size_t max_memory_usage_bytes_;
  67   size_t max_unused_memory_usage_bytes_;
  68   size_t max_resource_count_;
  69   size_t memory_usage_bytes_;
  70   size_t unused_memory_usage_bytes_;
  71   size_t resource_count_;
  72
  73   typedef std::list<Resource*> ResourceList;
  74   ResourceList unused_resources_;
  75
  76   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
  77 };
  78
  79 }  // namespace cc
  80
  81 #endif  // CC_RESOURCES_RESOURCE_POOL_H_