content/common/host_shared_bitmap_manager.h

   1 // Copyright (c) 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 CONTENT_COMMON_HOST_SHARED_BITMAP_MANAGER_H_
   6 #define CONTENT_COMMON_HOST_SHARED_BITMAP_MANAGER_H_
   7
   8 #include <map>
   9 #include <set>
  10
  11 #include "base/basictypes.h"
  12 #include "base/containers/hash_tables.h"
  13 #include "base/hash.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/memory/shared_memory.h"
  17 #include "base/synchronization/lock.h"
  18 #include "base/trace_event/memory_dump_provider.h"
  19 #include "cc/resources/shared_bitmap_manager.h"
  20 #include "content/common/content_export.h"
  21
  22 namespace BASE_HASH_NAMESPACE {
  23 template <>
  24 struct hash<cc::SharedBitmapId> {
  25   size_t operator()(const cc::SharedBitmapId& id) const {
  26     return base::Hash(reinterpret_cast<const char*>(id.name), sizeof(id.name));
  27   }
  28 };
  29 }  // namespace BASE_HASH_NAMESPACE
  30
  31 namespace content {
  32 class BitmapData;
  33 class HostSharedBitmapManager;
  34
  35 class CONTENT_EXPORT HostSharedBitmapManagerClient {
  36  public:
  37   explicit HostSharedBitmapManagerClient(HostSharedBitmapManager* manager);
  38
  39   ~HostSharedBitmapManagerClient();
  40
  41   void AllocateSharedBitmapForChild(
  42       base::ProcessHandle process_handle,
  43       size_t buffer_size,
  44       const cc::SharedBitmapId& id,
  45       base::SharedMemoryHandle* shared_memory_handle);
  46   void ChildAllocatedSharedBitmap(size_t buffer_size,
  47                                   const base::SharedMemoryHandle& handle,
  48                                   base::ProcessHandle process_handle,
  49                                   const cc::SharedBitmapId& id);
  50   void ChildDeletedSharedBitmap(const cc::SharedBitmapId& id);
  51
  52  private:
  53   HostSharedBitmapManager* manager_;
  54   base::hash_set<cc::SharedBitmapId> owned_bitmaps_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(HostSharedBitmapManagerClient);
  57 };
  58
  59 class CONTENT_EXPORT HostSharedBitmapManager
  60     : public cc::SharedBitmapManager,
  61       public base::trace_event::MemoryDumpProvider {
  62  public:
  63   HostSharedBitmapManager();
  64   ~HostSharedBitmapManager() override;
  65
  66   static HostSharedBitmapManager* current();
  67
  68   // cc::SharedBitmapManager implementation.
  69   scoped_ptr<cc::SharedBitmap> AllocateSharedBitmap(
  70       const gfx::Size& size) override;
  71   scoped_ptr<cc::SharedBitmap> GetSharedBitmapFromId(
  72       const gfx::Size& size,
  73       const cc::SharedBitmapId&) override;
  74
  75   // base::trace_event::MemoryDumpProvider implementation.
  76   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
  77                     base::trace_event::ProcessMemoryDump* pmd) override;
  78
  79   size_t AllocatedBitmapCount() const;
  80
  81   void FreeSharedMemoryFromMap(const cc::SharedBitmapId& id);
  82
  83  private:
  84   friend class HostSharedBitmapManagerClient;
  85
  86   void AllocateSharedBitmapForChild(
  87       base::ProcessHandle process_handle,
  88       size_t buffer_size,
  89       const cc::SharedBitmapId& id,
  90       base::SharedMemoryHandle* shared_memory_handle);
  91   void ChildAllocatedSharedBitmap(size_t buffer_size,
  92                                   const base::SharedMemoryHandle& handle,
  93                                   base::ProcessHandle process_handle,
  94                                   const cc::SharedBitmapId& id);
  95   void ChildDeletedSharedBitmap(const cc::SharedBitmapId& id);
  96
  97   mutable base::Lock lock_;
  98
  99   typedef base::hash_map<cc::SharedBitmapId, scoped_refptr<BitmapData> >
 100       BitmapMap;
 101   BitmapMap handle_map_;
 102
 103   DISALLOW_COPY_AND_ASSIGN(HostSharedBitmapManager);
 104 };
 105
 106 }  // namespace content
 107
 108 #endif  // CONTENT_COMMON_HOST_SHARED_BITMAP_MANAGER_H_