cc/resources/memory_history.h

   1 // Copyright 2013 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_MEMORY_HISTORY_H_
   6 #define CC_RESOURCES_MEMORY_HISTORY_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/time/time.h"
  11 #include "cc/debug/ring_buffer.h"
  12
  13 namespace cc {
  14
  15 // Maintains a history of memory for each frame.
  16 class MemoryHistory {
  17  public:
  18   static scoped_ptr<MemoryHistory> Create();
  19
  20   size_t HistorySize() const { return ring_buffer_.BufferSize(); }
  21
  22   struct Entry {
  23     Entry()
  24         : total_budget_in_bytes(0),
  25           total_bytes_used(0),
  26           had_enough_memory(false) {}
  27
  28     size_t total_budget_in_bytes;
  29     size_t total_bytes_used;
  30     bool had_enough_memory;
  31   };
  32
  33   void SaveEntry(const Entry& entry);
  34   void GetMinAndMax(size_t* min, size_t* max) const;
  35
  36   typedef RingBuffer<Entry, 80> RingBufferType;
  37   RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
  38   RingBufferType::Iterator End() const { return ring_buffer_.End(); }
  39
  40  private:
  41   MemoryHistory();
  42
  43   RingBufferType ring_buffer_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(MemoryHistory);
  46 };
  47
  48 }  // namespace cc
  49
  50 #endif  // CC_RESOURCES_MEMORY_HISTORY_H_