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                                          ResourceFormat default_format) {
  24     return make_scoped_ptr(new ResourcePool(resource_provider,
  25                                             target,
  26                                             default_format));
  27   }
  28
  29   virtual ~ResourcePool();
  30
  31   scoped_ptr<ScopedResource> AcquireResource(const gfx::Size& size,
  32                                              ResourceFormat format);
  33   void ReleaseResource(scoped_ptr<ScopedResource>);
  34
  35   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
  36                               size_t max_unused_memory_usage_bytes,
  37                               size_t max_resource_count);
  38
  39   void ReduceResourceUsage();
  40   // This might block if |wait_if_needed| is true and one of the currently
  41   // busy resources has a read lock fence that needs to be waited upon before
  42   // it can be locked for write again.
  43   void CheckBusyResources(bool wait_if_needed);
  44
  45   size_t total_memory_usage_bytes() const { return memory_usage_bytes_; }
  46   size_t acquired_memory_usage_bytes() const {
  47     return memory_usage_bytes_ - unused_memory_usage_bytes_;
  48   }
  49   size_t total_resource_count() const { return resource_count_; }
  50   size_t acquired_resource_count() const {
  51     return resource_count_ - unused_resources_.size();
  52   }
  53   size_t busy_resource_count() const { return busy_resources_.size(); }
  54
  55   ResourceFormat default_format() const { return default_format_; }
  56
  57  protected:
  58   ResourcePool(ResourceProvider* resource_provider,
  59                GLenum target,
  60                ResourceFormat default_format);
  61
  62   bool ResourceUsageTooHigh();
  63
  64  private:
  65   void DidFinishUsingResource(ScopedResource* resource);
  66
  67   ResourceProvider* resource_provider_;
  68   const GLenum target_;
  69   // TODO(peterp): Remove the format state and let the clients keep track of
  70   // this instead.
  71   const ResourceFormat default_format_;
  72   size_t max_memory_usage_bytes_;
  73   size_t max_unused_memory_usage_bytes_;
  74   size_t max_resource_count_;
  75   size_t memory_usage_bytes_;
  76   size_t unused_memory_usage_bytes_;
  77   size_t resource_count_;
  78
  79   typedef std::list<ScopedResource*> ResourceList;
  80   ResourceList unused_resources_;
  81   ResourceList busy_resources_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
  84 };
  85
  86 }  // namespace cc
  87
  88 #endif  // CC_RESOURCES_RESOURCE_POOL_H_