Add shared bitmap managers for browser and renderer processes.

The shared bitmap managers will allow software tiles to be allocated in shared memory, so delegated rendering could be used with them.

BUG=327220
R=danakj@chromium.org, jschuh@chromium.org, piman@chromium.org

Review URL: https://codereview.chromium.org/148243013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256955 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 168 insertions, 0 deletions

diff --git a/content/common/host_shared_bitmap_manager.cc b/content/common/host_shared_bitmap_manager.cc
new file mode 100644
index 0000000..aa0cd81
--- /dev/null
+++ b/content/common/host_shared_bitmap_manager.cc
@@ -0,0 +1,168 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/common/host_shared_bitmap_manager.h"
+
+#include "base/lazy_instance.h"
+#include "base/memory/ref_counted.h"
+#include "content/common/view_messages.h"
+#include "ui/gfx/size.h"
+
+namespace content {
+
+class BitmapData : public base::RefCountedThreadSafe<BitmapData> {
+ public:
+  BitmapData(base::ProcessHandle process_handle,
+             base::SharedMemoryHandle memory_handle,
+             size_t buffer_size)
+      : process_handle(process_handle),
+        memory_handle(memory_handle),
+        buffer_size(buffer_size) {}
+  base::ProcessHandle process_handle;
+  base::SharedMemoryHandle memory_handle;
+  scoped_ptr<base::SharedMemory> memory;
+  size_t buffer_size;
+
+ private:
+  friend class base::RefCountedThreadSafe<BitmapData>;
+  ~BitmapData() {}
+  DISALLOW_COPY_AND_ASSIGN(BitmapData);
+};
+
+// Holds a reference on the memory to keep it alive.
+void FreeSharedMemory(scoped_refptr<BitmapData> data,
+                      cc::SharedBitmap* bitmap) {}
+
+base::LazyInstance<HostSharedBitmapManager> g_shared_memory_manager =
+    LAZY_INSTANCE_INITIALIZER;
+
+HostSharedBitmapManager::HostSharedBitmapManager() {}
+HostSharedBitmapManager::~HostSharedBitmapManager() {}
+
+HostSharedBitmapManager* HostSharedBitmapManager::current() {
+  return g_shared_memory_manager.Pointer();
+}
+
+scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::AllocateSharedBitmap(
+    const gfx::Size& size) {
+  // Bitmaps allocated in host don't need to be shared to other processes, so
+  // allocate them with new instead.
+  return scoped_ptr<cc::SharedBitmap>();
+}
+
+scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::GetSharedBitmapFromId(
+    const gfx::Size& size,
+    const cc::SharedBitmapId& id) {
+  base::AutoLock lock(lock_);
+  BitmapMap::iterator it = handle_map_.find(id);
+  if (it == handle_map_.end())
+    return scoped_ptr<cc::SharedBitmap>();
+
+  BitmapData* data = it->second.get();
+
+  size_t bitmap_size;
+  if (!cc::SharedBitmap::GetSizeInBytes(size, &bitmap_size) ||
+      bitmap_size > data->buffer_size)
+    return scoped_ptr<cc::SharedBitmap>();
+
+  if (!data->memory->memory()) {
+    TRACE_EVENT0("renderer_host",
+                 "HostSharedBitmapManager::GetSharedBitmapFromId");
+    if (!data->memory->Map(data->buffer_size)) {
+      return scoped_ptr<cc::SharedBitmap>();
+    }
+  }
+
+  scoped_ptr<cc::SharedBitmap> bitmap(new cc::SharedBitmap(
+      data->memory.get(), id, base::Bind(&FreeSharedMemory, it->second)));
+
+  return bitmap.Pass();
+}
+
+scoped_ptr<cc::SharedBitmap> HostSharedBitmapManager::GetBitmapForSharedMemory(
+    base::SharedMemory*) {
+  return scoped_ptr<cc::SharedBitmap>();
+}
+
+void HostSharedBitmapManager::ChildAllocatedSharedBitmap(
+    size_t buffer_size,
+    const base::SharedMemoryHandle& handle,
+    base::ProcessHandle process_handle,
+    const cc::SharedBitmapId& id) {
+  base::AutoLock lock(lock_);
+  if (handle_map_.find(id) != handle_map_.end())
+    return;
+  scoped_refptr<BitmapData> data(
+      new BitmapData(process_handle, handle, buffer_size));
+
+  handle_map_[id] = data;
+  process_map_[process_handle].insert(id);
+#if defined(OS_WIN)
+  data->memory = make_scoped_ptr(
+      new base::SharedMemory(data->memory_handle, false, data->process_handle));
+#else
+  data->memory =
+      make_scoped_ptr(new base::SharedMemory(data->memory_handle, false));
+#endif
+}
+
+void HostSharedBitmapManager::AllocateSharedBitmapForChild(
+    base::ProcessHandle process_handle,
+    size_t buffer_size,
+    const cc::SharedBitmapId& id,
+    base::SharedMemoryHandle* shared_memory_handle) {
+  base::AutoLock lock(lock_);
+  if (handle_map_.find(id) != handle_map_.end()) {
+    *shared_memory_handle = base::SharedMemory::NULLHandle();
+    return;
+  }
+  scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
+  if (!shared_memory->CreateAndMapAnonymous(buffer_size)) {
+    LOG(ERROR) << "Cannot create shared memory buffer";
+    *shared_memory_handle = base::SharedMemory::NULLHandle();
+    return;
+  }
+
+  scoped_refptr<BitmapData> data(
+      new BitmapData(process_handle, shared_memory->handle(), buffer_size));
+  data->memory = shared_memory.Pass();
+
+  handle_map_[id] = data;
+  process_map_[process_handle].insert(id);
+  if (!data->memory->ShareToProcess(process_handle, shared_memory_handle)) {
+    LOG(ERROR) << "Cannot share shared memory buffer";
+    *shared_memory_handle = base::SharedMemory::NULLHandle();
+    return;
+  }
+}
+
+void HostSharedBitmapManager::ChildDeletedSharedBitmap(
+    const cc::SharedBitmapId& id) {
+  base::AutoLock lock(lock_);
+  BitmapMap::iterator it = handle_map_.find(id);
+  if (it == handle_map_.end())
+    return;
+  base::hash_set<cc::SharedBitmapId>& res =
+      process_map_[it->second->process_handle];
+  res.erase(id);
+  handle_map_.erase(it);
+}
+
+void HostSharedBitmapManager::ProcessRemoved(
+    base::ProcessHandle process_handle) {
+  base::AutoLock lock(lock_);
+  ProcessMap::iterator proc_it = process_map_.find(process_handle);
+  if (proc_it == process_map_.end())
+    return;
+  base::hash_set<cc::SharedBitmapId>& res = proc_it->second;
+
+  for (base::hash_set<cc::SharedBitmapId>::iterator it = res.begin();
+       it != res.end();
+       ++it) {
+    handle_map_.erase(*it);
+  }
+  process_map_.erase(proc_it);
+}
+
+}  // namespace content