ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

content/browser/gpu/browser_native_pixmap_manager_ozone.cc

+// Copyright 2015 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/browser/gpu/browser_native_pixmap_manager_ozone.h"
+
+#include "base/memory/singleton.h"
+#include "base/posix/eintr_wrapper.h"
+#include "content/common/gpu/native_pixmap_manager_ozone_messages.h"
+#include "content/public/browser/browser_message_filter.h"
+#include "ui/ozone/public/ozone_platform.h"
+
+namespace content {
+
+namespace {
+
+class BrowserNativePixmapManagerMessageFilter : public BrowserMessageFilter {
+ public:
+  explicit BrowserNativePixmapManagerMessageFilter(
+      BrowserNativePixmapManager* manager)
+      : BrowserMessageFilter(BrowserNativePixmapManagerMsgStart),
+        manager_(manager) {}
+
+  bool OnMessageReceived(const IPC::Message& message) override {
+    bool handled = true;
+    IPC_BEGIN_MESSAGE_MAP(BrowserNativePixmapManagerMessageFilter, message)
+      IPC_MESSAGE_HANDLER_DELAY_REPLY(
+          BrowserNativePixmapManagerMsg_SyncGetVirtualDevice,
+          OnGetVirtualDevice)
+      IPC_MESSAGE_UNHANDLED(handled = false)
+    IPC_END_MESSAGE_MAP()
+    return handled;
+  }
+
+ private:
+  ~BrowserNativePixmapManagerMessageFilter() override {}
+
+  void OnGetVirtualDevice(IPC::Message* reply) {
+    DCHECK(manager_);
+    manager_->GetVirtualDeviceForChildProcess(base::Bind(
+        &BrowserNativePixmapManagerMessageFilter::VirtualDeviceRelpied, this,
+        reply));
+  }
+  void VirtualDeviceRelpied(IPC::Message* reply,
+                            const base::FileDescriptor& device) {
+    DCHECK_CURRENTLY_ON(BrowserThread::IO);
+    BrowserNativePixmapManagerMsg_SyncGetVirtualDevice::WriteReplyParams(
+        reply, device);
+    Send(reply);
+  }
+
+  BrowserNativePixmapManager* manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserNativePixmapManagerMessageFilter);
+};
+
+void DupVirtualDeviceFd(
+    int device_fd,
+    const BrowserNativePixmapManager::FileDescriptorCallback& callback) {
+  int duped_fd = -1;
+  base::ThreadRestrictions::AssertIOAllowed();
+  duped_fd = HANDLE_EINTR(dup(device_fd));
+  if (duped_fd < 0) {
+    PLOG(ERROR) << "dup() failed.";
+    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                            base::Bind(callback, base::FileDescriptor()));
+    return;
+  }
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(callback, base::FileDescriptor(duped_fd, true)));
+}
+
+}  // namespace
+
+struct BrowserNativePixmapManagerTrait
+    : public DefaultSingletonTraits<BrowserNativePixmapManager> {
+  static BrowserNativePixmapManager* New() {
+    BrowserNativePixmapManager* manager = new BrowserNativePixmapManager();
+    manager->Initialize(ui::OzonePlatform::GetInstance()->GetVirtualDeviceFd());
+    return manager;
+  }
+};
+
+// static
+BrowserNativePixmapManager* BrowserNativePixmapManager::GetInstance() {
+  return Singleton<BrowserNativePixmapManager,
+                   BrowserNativePixmapManagerTrait>::get();
+}
+
+BrowserNativePixmapManager::BrowserNativePixmapManager() {}
+
+BrowserNativePixmapManager::~BrowserNativePixmapManager() {}
+
+void BrowserNativePixmapManager::Initialize(
+    const base::FileDescriptor& device_fd) {
+  pixmap_manager_ = ui::NativePixmapManager::Create(device_fd);
+  device_fd_ = device_fd;
+}
+
+std::vector<ui::NativePixmapManager::Configuration>
+BrowserNativePixmapManager::GetSupportedNativePixmapConfigurations() const {
+  return pixmap_manager_->GetSupportedNativePixmapConfigurations();
+}
+
+void BrowserNativePixmapManager::GetVirtualDeviceForChildProcess(
+    const FileDescriptorCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  base::SequencedWorkerPool* pool = content::BrowserThread::GetBlockingPool();
+  pool->PostWorkerTask(
+      FROM_HERE, base::Bind(&DupVirtualDeviceFd, device_fd_.fd, callback));
+}
+
+BrowserMessageFilter* BrowserNativePixmapManager::CreateMessageFilter() {
+  return new BrowserNativePixmapManagerMessageFilter(this);
+}
+
+}  // namespace content