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/compiler_specific.h"
  13 #include "base/containers/hash_tables.h"
  14 #include "base/hash.h"
  15 #include "base/memory/ref_counted.h"
  16 #include "base/memory/scoped_ptr.h"
  17 #include "base/memory/shared_memory.h"
  18 #include "base/synchronization/lock.h"
  19 #include "cc/resources/shared_bitmap_manager.h"
  20 #include "content/common/content_export.h"
  21
  22 namespace BASE_HASH_NAMESPACE {
  23 #if defined(COMPILER_GCC)
  24 template <>
  25 struct hash<cc::SharedBitmapId> {
  26   size_t operator()(const cc::SharedBitmapId& id) const {
  27     return base::Hash(reinterpret_cast<const char*>(id.name), sizeof(id.name));
  28   }
  29 };
  30 #elif defined(COMPILER_MSVC)
  31 inline std::size_t hash_value(const cc::SharedBitmapId& id) {
  32   return base::Hash(reinterpret_cast<const char*>(id.name), sizeof(id.name));
  33 }
  34 #endif  // COMPILER
  35 }  // namespace BASE_HASH_NAMESPACE
  36
  37 namespace content {
  38 class BitmapData;
  39
  40 class CONTENT_EXPORT HostSharedBitmapManager : public cc::SharedBitmapManager {
  41  public:
  42   HostSharedBitmapManager();
  43   ~HostSharedBitmapManager() override;
  44
  45   static HostSharedBitmapManager* current();
  46
  47   // cc::SharedBitmapManager implementation.
  48   scoped_ptr<cc::SharedBitmap> AllocateSharedBitmap(
  49       const gfx::Size& size) override;
  50   scoped_ptr<cc::SharedBitmap> GetSharedBitmapFromId(
  51       const gfx::Size& size,
  52       const cc::SharedBitmapId&) override;
  53   scoped_ptr<cc::SharedBitmap> GetBitmapForSharedMemory(
  54       base::SharedMemory*) override;
  55
  56   void AllocateSharedBitmapForChild(
  57       base::ProcessHandle process_handle,
  58       size_t buffer_size,
  59       const cc::SharedBitmapId& id,
  60       base::SharedMemoryHandle* shared_memory_handle);
  61   void ChildAllocatedSharedBitmap(size_t buffer_size,
  62                                   const base::SharedMemoryHandle& handle,
  63                                   base::ProcessHandle process_handle,
  64                                   const cc::SharedBitmapId& id);
  65   void ChildDeletedSharedBitmap(const cc::SharedBitmapId& id);
  66   void ProcessRemoved(base::ProcessHandle process_handle);
  67
  68   size_t AllocatedBitmapCount() const;
  69
  70  private:
  71   void FreeSharedMemoryFromMap(cc::SharedBitmap* bitmap);
  72
  73   mutable base::Lock lock_;
  74
  75   typedef base::hash_map<cc::SharedBitmapId, scoped_refptr<BitmapData> >
  76       BitmapMap;
  77   BitmapMap handle_map_;
  78
  79   typedef base::hash_map<base::ProcessHandle,
  80                          base::hash_set<cc::SharedBitmapId> > ProcessMap;
  81   ProcessMap process_map_;
  82 };
  83
  84 }  // namespace content
  85
  86 #endif  // CONTENT_COMMON_HOST_SHARED_BITMAP_MANAGER_H_