content/common/host_shared_bitmap_manager.cc

   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 #include "content/common/host_shared_bitmap_manager.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/memory/ref_counted.h"
   9 #include "content/common/view_messages.h"
  10 #include "ui/gfx/size.h"
  11
  12 namespace content {
  13
  14 class BitmapData : public base::RefCountedThreadSafe<BitmapData> {
  15  public:
  16   BitmapData(base::ProcessHandle process_handle,
  17              base::SharedMemoryHandle memory_handle,
  18              size_t buffer_size)
  19       : process_handle(process_handle),
  20         memory_handle(memory_handle),
  21         buffer_size(buffer_size) {}
  22   base::ProcessHandle process_handle;
  23   base::SharedMemoryHandle memory_handle;
  24   scoped_ptr<base::SharedMemory> memory;
  25   scoped_ptr<uint8[]> pixels;
  26   size_t buffer_size;
  27
  28  private:
  29   friend class base::RefCountedThreadSafe<BitmapData>;
  30   ~BitmapData() {}
  31   DISALLOW_COPY_AND_ASSIGN(BitmapData);
  32 };
  33
  34 // Holds a reference on the memory to keep it alive.
  35 void FreeSharedMemory(scoped_refptr<BitmapData> data,
  36                       cc::SharedBitmap* bitmap) {}
  37
  38 base::LazyInstance<HostSharedBitmapManager> g_shared_memory_manager =
  39     LAZY_INSTANCE_INITIALIZER;
  40
  41 HostSharedBitmapManager::HostSharedBitmapManager() {}
  42 HostSharedBitmapManager::~HostSharedBitmapManager() {}
  43
  44 HostSharedBitmapManager* HostSharedBitmapManager::current() {
  45   return g_shared_memory_manager.Pointer();
  46 }
  47
  48 scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::AllocateSharedBitmap(
  49     const gfx::Size& size) {
  50   base::AutoLock lock(lock_);
  51   size_t bitmap_size;
  52   if (!cc::SharedBitmap::SizeInBytes(size, &bitmap_size))
  53     return scoped_ptr<cc::SharedBitmap>();
  54
  55   scoped_refptr<BitmapData> data(
  56       new BitmapData(base::GetCurrentProcessHandle(),
  57                      base::SharedMemory::NULLHandle(),
  58                      bitmap_size));
  59   // Bitmaps allocated in host don't need to be shared to other processes, so
  60   // allocate them with new instead.
  61   data->pixels = scoped_ptr<uint8[]>(new uint8[bitmap_size]);
  62
  63   cc::SharedBitmapId id = cc::SharedBitmap::GenerateId();
  64   handle_map_[id] = data;
  65   return make_scoped_ptr(new cc::SharedBitmap(
  66       data->pixels.get(),
  67       id,
  68       base::Bind(&HostSharedBitmapManager::FreeSharedMemoryFromMap,
  69                  base::Unretained(this))));
  70 }
  71
  72 scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::GetSharedBitmapFromId(
  73     const gfx::Size& size,
  74     const cc::SharedBitmapId& id) {
  75   base::AutoLock lock(lock_);
  76   BitmapMap::iterator it = handle_map_.find(id);
  77   if (it == handle_map_.end())
  78     return scoped_ptr<cc::SharedBitmap>();
  79
  80   BitmapData* data = it->second.get();
  81
  82   size_t bitmap_size;
  83   if (!cc::SharedBitmap::SizeInBytes(size, &bitmap_size) ||
  84       bitmap_size > data->buffer_size)
  85     return scoped_ptr<cc::SharedBitmap>();
  86
  87   if (data->pixels) {
  88     return make_scoped_ptr(new cc::SharedBitmap(
  89         data->pixels.get(), id, base::Bind(&FreeSharedMemory, it->second)));
  90   }
  91   if (!data->memory->memory()) {
  92     TRACE_EVENT0("renderer_host",
  93                  "HostSharedBitmapManager::GetSharedBitmapFromId");
  94     if (!data->memory->Map(data->buffer_size)) {
  95       return scoped_ptr<cc::SharedBitmap>();
  96     }
  97   }
  98
  99   scoped_ptr<cc::SharedBitmap> bitmap(new cc::SharedBitmap(
 100       data->memory.get(), id, base::Bind(&FreeSharedMemory, it->second)));
 101
 102   return bitmap.Pass();
 103 }
 104
 105 scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::GetBitmapForSharedMemory(
 106     base::SharedMemory*) {
 107   return scoped_ptr<cc::SharedBitmap>();
 108 }
 109
 110 void HostSharedBitmapManager::ChildAllocatedSharedBitmap(
 111     size_t buffer_size,
 112     const base::SharedMemoryHandle& handle,
 113     base::ProcessHandle process_handle,
 114     const cc::SharedBitmapId& id) {
 115   base::AutoLock lock(lock_);
 116   if (handle_map_.find(id) != handle_map_.end())
 117     return;
 118   scoped_refptr<BitmapData> data(
 119       new BitmapData(process_handle, handle, buffer_size));
 120
 121   handle_map_[id] = data;
 122   process_map_[process_handle].insert(id);
 123 #if defined(OS_WIN)
 124   data->memory = make_scoped_ptr(
 125       new base::SharedMemory(data->memory_handle, false, data->process_handle));
 126 #else
 127   data->memory =
 128       make_scoped_ptr(new base::SharedMemory(data->memory_handle, false));
 129 #endif
 130 }
 131
 132 void HostSharedBitmapManager::AllocateSharedBitmapForChild(
 133     base::ProcessHandle process_handle,
 134     size_t buffer_size,
 135     const cc::SharedBitmapId& id,
 136     base::SharedMemoryHandle* shared_memory_handle) {
 137   base::AutoLock lock(lock_);
 138   if (handle_map_.find(id) != handle_map_.end()) {
 139     *shared_memory_handle = base::SharedMemory::NULLHandle();
 140     return;
 141   }
 142   scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
 143   if (!shared_memory->CreateAndMapAnonymous(buffer_size)) {
 144     LOG(ERROR) << "Cannot create shared memory buffer";
 145     *shared_memory_handle = base::SharedMemory::NULLHandle();
 146     return;
 147   }
 148
 149   scoped_refptr<BitmapData> data(
 150       new BitmapData(process_handle, shared_memory->handle(), buffer_size));
 151   data->memory = shared_memory.Pass();
 152
 153   handle_map_[id] = data;
 154   process_map_[process_handle].insert(id);
 155   if (!data->memory->ShareToProcess(process_handle, shared_memory_handle)) {
 156     LOG(ERROR) << "Cannot share shared memory buffer";
 157     *shared_memory_handle = base::SharedMemory::NULLHandle();
 158     return;
 159   }
 160 }
 161
 162 void HostSharedBitmapManager::ChildDeletedSharedBitmap(
 163     const cc::SharedBitmapId& id) {
 164   base::AutoLock lock(lock_);
 165   BitmapMap::iterator it = handle_map_.find(id);
 166   if (it == handle_map_.end())
 167     return;
 168   base::hash_set<cc::SharedBitmapId>& res =
 169       process_map_[it->second->process_handle];
 170   res.erase(id);
 171   handle_map_.erase(it);
 172 }
 173
 174 void HostSharedBitmapManager::ProcessRemoved(
 175     base::ProcessHandle process_handle) {
 176   base::AutoLock lock(lock_);
 177   ProcessMap::iterator proc_it = process_map_.find(process_handle);
 178   if (proc_it == process_map_.end())
 179     return;
 180   base::hash_set<cc::SharedBitmapId>& res = proc_it->second;
 181
 182   for (base::hash_set<cc::SharedBitmapId>::iterator it = res.begin();
 183        it != res.end();
 184        ++it) {
 185     handle_map_.erase(*it);
 186   }
 187   process_map_.erase(proc_it);
 188 }
 189
 190 void HostSharedBitmapManager::FreeSharedMemoryFromMap(
 191     cc::SharedBitmap* bitmap) {
 192   base::AutoLock lock(lock_);
 193   handle_map_.erase(bitmap->id());
 194 }
 195
 196 }  // namespace content