cc:: Add remote mode to the compositor

cc/trees/layer_tree_host.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 28 matching lines @@
 #include "cc/layers/layer_settings.h"
 #include "cc/layers/painted_scrollbar_layer.h"
 #include "cc/resources/ui_resource_request.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/trees/draw_property_utils.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "cc/trees/proxy_main.h"
+#include "cc/trees/remote_channel_impl.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "cc/trees/tree_synchronizer.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
 
 namespace {
 static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
 }
 
 namespace cc {
@@ skipping 23 matching lines @@
     InitParams* params) {
   DCHECK(params->settings);
   scoped_ptr<LayerTreeHost> layer_tree_host(
       new LayerTreeHost(params, CompositorMode::SingleThreaded));
   layer_tree_host->InitializeSingleThreaded(
       single_thread_client, params->main_task_runner,
       std::move(params->external_begin_frame_source));
   return layer_tree_host;
 }
 
+scoped_ptr<LayerTreeHost> LayerTreeHost::CreateRemoteServer(
+    RemoteProtoChannel* remote_proto_channel,
+    InitParams* params) {
+  DCHECK(params->main_task_runner.get());
+  DCHECK(params->settings);
+  DCHECK(remote_proto_channel);
+
+  // Using an external begin frame source is not supported in remote mode.

[vmpstr, 2016/01/11 21:50:15]

... in remote server mode.

[Khushal, 2016/01/13 02:07:12]

Done.

+  DCHECK(!params->settings->use_external_begin_frame_source);
+  DCHECK(!params->external_begin_frame_source);
+
+  scoped_ptr<LayerTreeHost> layer_tree_host(
+      new LayerTreeHost(params, CompositorMode::Remote));
+  layer_tree_host->InitializeRemoteServer(remote_proto_channel,
+                                          params->main_task_runner);
+  return layer_tree_host;
+}
+
+scoped_ptr<LayerTreeHost> LayerTreeHost::CreateRemoteClient(
+    RemoteProtoChannel* remote_proto_channel,
+    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
+    InitParams* params) {
+  DCHECK(params->main_task_runner.get());
+  DCHECK(params->settings);
+  DCHECK(remote_proto_channel);
+
+  // Using an external begin frame source is not supported in remote mode.
+  // TODO(khushalsagar): Add support for providing an external begin frame

[vmpstr, 2016/01/11 21:50:15]

File a bug for this and reference it in here, please.

[Khushal, 2016/01/13 02:07:12]

Done.

+  // source on the client LayerTreeHost.
+  DCHECK(!params->settings->use_external_begin_frame_source);
+  DCHECK(!params->external_begin_frame_source);
+
+  scoped_ptr<LayerTreeHost> layer_tree_host(
+      new LayerTreeHost(params, CompositorMode::Remote));
+  layer_tree_host->InitializeRemoteClient(
+      remote_proto_channel, params->main_task_runner, impl_task_runner);
+  return layer_tree_host;
+}
+
 LayerTreeHost::LayerTreeHost(InitParams* params, CompositorMode mode)
     : micro_benchmark_controller_(this),
       next_ui_resource_id_(1),
       compositor_mode_(mode),
       needs_full_tree_sync_(true),
       needs_meta_info_recomputation_(true),
       client_(params->client),
       source_frame_number_(0),
       meta_information_sequence_number_(1),
       rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
@@ skipping 53 matching lines @@
 void LayerTreeHost::InitializeSingleThreaded(
     LayerTreeHostSingleThreadClient* single_thread_client,
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
   task_runner_provider_ = TaskRunnerProvider::Create(main_task_runner, nullptr);
   InitializeProxy(SingleThreadProxy::Create(this, single_thread_client,
                                             task_runner_provider_.get()),
                   std::move(external_begin_frame_source));
 }
 
+void LayerTreeHost::InitializeRemoteServer(
+    RemoteProtoChannel* remote_proto_channel,
+    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner) {
+  task_runner_provider_ = TaskRunnerProvider::Create(main_task_runner, nullptr);
+  InitializeProxy(ProxyMain::CreateRemote(remote_proto_channel, this,
+                                          task_runner_provider_.get()),
+                  nullptr);
+}
+
+void LayerTreeHost::InitializeRemoteClient(
+    RemoteProtoChannel* remote_proto_channel,
+    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
+  task_runner_provider_ =
+      TaskRunnerProvider::Create(main_task_runner, impl_task_runner);
+  InitializeProxy(RemoteChannelImpl::Create(this, remote_proto_channel,

[vmpstr, 2016/01/11 21:50:15]

I think it's worth putting a comment here to kind of explain the overall
structure of the client

LTH owns RCI which owns foo

[Khushal, 2016/01/13 02:07:12]

Done.

+                                            task_runner_provider_.get()),
+                  nullptr);
+}
+
 void LayerTreeHost::InitializeForTesting(
     scoped_ptr<TaskRunnerProvider> task_runner_provider,
     scoped_ptr<Proxy> proxy_for_testing,
     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
   task_runner_provider_ = std::move(task_runner_provider);
   InitializeProxy(std::move(proxy_for_testing),
                   std::move(external_begin_frame_source));
 }
 
 void LayerTreeHost::SetTaskRunnerProviderForTesting(
     scoped_ptr<TaskRunnerProvider> task_runner_provider) {
   DCHECK(!task_runner_provider_);
   task_runner_provider_ = std::move(task_runner_provider);
 }
 
 void LayerTreeHost::InitializeProxy(
     scoped_ptr<Proxy> proxy,
     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
   TRACE_EVENT0("cc", "LayerTreeHost::InitializeForReal");
+  DCHECK(task_runner_provider_);
 
   proxy_ = std::move(proxy);
   proxy_->Start(std::move(external_begin_frame_source));
   if (settings_.accelerated_animation_enabled) {
     if (animation_host_)
       animation_host_->SetSupportsScrollAnimations(
           proxy_->SupportsImplScrolling());
     else
       animation_registrar_->set_supports_scroll_animations(
           proxy_->SupportsImplScrolling());
@@ skipping 25 matching lines @@
   RegisterViewportLayers(NULL, NULL, NULL, NULL);
 
   if (root_layer_.get()) {
     // The layer tree must be destroyed before the layer tree host. We've
     // made a contract with our animation controllers that the registrar
     // will outlive them, and we must make good.
     root_layer_ = NULL;
   }
 }
 
+void LayerTreeHost::ToProtobuf() {
+  DCHECK(task_runner_provider_->IsMainThread());
+  DCHECK(IsRemoteServer());
+
+  // TODO(khushalsagar, nyquist): Serialize LayerTreeHost state to proto.

[vmpstr, 2016/01/11 21:50:15]

crbug?

[Khushal, 2016/01/13 02:07:12]

Removed.

+}
+
+void LayerTreeHost::FromProtobuf() {
+  DCHECK(task_runner_provider_->IsMainThread());
+  DCHECK(IsRemoteClient());
+
+  // TODO(khushalsagar, nyquist): Deserialize LayerTreeHost state from proto.

[vmpstr, 2016/01/11 21:50:15]

crbug?

[Khushal, 2016/01/13 02:07:12]

Removed.

+}
+
 void LayerTreeHost::WillBeginMainFrame() {
   devtools_instrumentation::WillBeginMainThreadFrame(id(),
                                                      source_frame_number());
   client_->WillBeginMainFrame();
 }
 
 void LayerTreeHost::DidBeginMainFrame() {
   client_->DidBeginMainFrame();
 }
 
@@ skipping 12 matching lines @@
 void LayerTreeHost::RequestMainFrameUpdate() {
   client_->UpdateLayerTreeHost();
 }
 
 // This function commits the LayerTreeHost to an impl tree. When modifying
 // this function, keep in mind that the function *runs* on the impl thread! Any
 // code that is logically a main thread operation, e.g. deletion of a Layer,
 // should be delayed until the LayerTreeHost::CommitComplete, which will run
 // after the commit, but on the main thread.
 void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
+  DCHECK(!IsRemoteServer());
   DCHECK(task_runner_provider_->IsImplThread());
 
   bool is_new_trace;
   TRACE_EVENT_IS_NEW_TRACE(&is_new_trace);
   if (is_new_trace &&
       frame_viewer_instrumentation::IsTracingLayerTreeSnapshots() &&
       root_layer()) {
     LayerTreeHostCommon::CallFunctionForSubtree(
         root_layer(), [](Layer* layer) { layer->DidBeginTracing(); });
   }
@@ skipping 165 matching lines @@
   // Note: It is safe to drop all output surface references here as
   // LayerTreeHostImpl will not keep a pointer to either the old or
   // new output surface after failing to initialize the new one.
   current_output_surface_ = nullptr;
   new_output_surface_ = nullptr;
   client_->DidFailToInitializeOutputSurface();
 }
 
 scoped_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
     LayerTreeHostImplClient* client) {
+  DCHECK(!IsRemoteServer());
   DCHECK(task_runner_provider_->IsImplThread());
   scoped_ptr<LayerTreeHostImpl> host_impl = LayerTreeHostImpl::Create(
       settings_, client, task_runner_provider_.get(),
       rendering_stats_instrumentation_.get(), shared_bitmap_manager_,
       gpu_memory_buffer_manager_, task_graph_runner_, id_);
   host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
   host_impl->SetContentIsSuitableForGpuRasterization(
       content_is_suitable_for_gpu_rasterization_);
   shared_bitmap_manager_ = NULL;
   gpu_memory_buffer_manager_ = NULL;
@@ skipping 449 matching lines @@
   if (painted_device_scale_factor == painted_device_scale_factor_)
     return;
   painted_device_scale_factor_ = painted_device_scale_factor;
 
   SetNeedsCommit();
 }
 
 void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
                                            TopControlsState current,
                                            bool animate) {
-  // Top controls are only used in threaded mode.
-  DCHECK(IsThreaded());
+  // Top controls are only used in threaded or remote mode.
+  DCHECK(IsThreaded() || IsRemoteServer());
   proxy_->UpdateTopControlsState(constraints, current, animate);
 }
 
 void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {
   if (!settings_.accelerated_animation_enabled)
     return;
 
   AnimationEventsVector events;
   if (animation_host_) {
     if (animation_host_->AnimateLayers(monotonic_time))
@@ skipping 342 matching lines @@
          !task_runner_provider_->HasImplThread());
   return compositor_mode_ == CompositorMode::SingleThreaded;
 }
 
 bool LayerTreeHost::IsThreaded() const {
   DCHECK(compositor_mode_ != CompositorMode::Threaded ||
          task_runner_provider_->HasImplThread());
   return compositor_mode_ == CompositorMode::Threaded;
 }
 
+bool LayerTreeHost::IsRemoteServer() const {
+  // The LayerTreeHost on the server does not have an impl task runner.
+  return compositor_mode_ == CompositorMode::Remote &&
+         !task_runner_provider_->HasImplThread();
+}
+
+bool LayerTreeHost::IsRemoteClient() const {
+  return compositor_mode_ == CompositorMode::Remote &&
+         task_runner_provider_->HasImplThread();
+}
+
 }  // namespace cc