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