blimp: Move compositing, input and render widget feature to client/core.

blimp/client/core/compositor/blimp_compositor.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 "blimp/client/core/compositor/blimp_compositor.h"
+
+#include "base/bind_helpers.h"
+#include "base/command_line.h"
+#include "base/memory/ptr_util.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread.h"
+#include "base/threading/thread_local.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "cc/animation/animation_host.h"
+#include "cc/layers/layer.h"
+#include "cc/output/output_surface.h"
+#include "cc/proto/compositor_message.pb.h"
+#include "cc/trees/layer_tree_host.h"
+#include "cc/trees/layer_tree_settings.h"
+
+namespace blimp {
+namespace client {
+
+BlimpCompositor::BlimpCompositor(
+    cc::TaskGraphRunner* task_graph_runner,
+    gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+    cc::ImageSerializationProcessor* image_serialization_processor,
+    cc::LayerTreeSettings* settings,
+    scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner,
+    BlimpCompositorClient* client)
+    : task_graph_runner_(task_graph_runner),
+      gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
+      image_serialization_processor_(image_serialization_processor),
+      settings_(settings),
+      compositor_task_runner_(compositor_task_runner),
+      client_(client),
+      host_should_be_visible_(false),
+      remote_proto_channel_receiver_(nullptr) {
+  DCHECK(client_);
+  // TODO(khushalsagar): The BlimpCompositor is the remote counterpart to the
+  // RenderWidgetCompositor, and should have a 1:1 mapping with the
+  // LayerTreeHost, and we should be creating it when we create the host.
+  // Clean up this mess... D:
+}
+
+BlimpCompositor::~BlimpCompositor() {
+  if (host_) {
+    DestroyLayerTreeHost();
+  }
+}
+
+void BlimpCompositor::SetVisible(bool visible) {
+  host_should_be_visible_ = visible;
+  if (host_) {
+    host_->SetVisible(visible);
+  }
+}
+
+bool BlimpCompositor::IsVisible() const {
+  return host_should_be_visible_;
+}
+
+void BlimpCompositor::SetOutputSurface(
+    std::unique_ptr<cc::OutputSurface> output_surface) {
+  if (host_) {
+    host_->SetOutputSurface(std::move(output_surface));
+  }
+}
+
+void BlimpCompositor::ReleaseOutputSurface() {
+  if (!host_ || host_->output_surface_lost()) {
+    return;
+  }
+
+  host_->ReleaseOutputSurface();
+}
+
+void BlimpCompositor::WillBeginMainFrame() {}
+
+void BlimpCompositor::DidBeginMainFrame() {}
+
+void BlimpCompositor::BeginMainFrame(const cc::BeginFrameArgs& args) {}
+
+void BlimpCompositor::BeginMainFrameNotExpectedSoon() {}
+
+void BlimpCompositor::UpdateLayerTreeHost() {}
+
+void BlimpCompositor::ApplyViewportDeltas(
+    const gfx::Vector2dF& inner_delta,
+    const gfx::Vector2dF& outer_delta,
+    const gfx::Vector2dF& elastic_overscroll_delta,
+    float page_scale,
+    float top_controls_delta) {}
+
+void BlimpCompositor::RequestNewOutputSurface() {
+  client_->RequestOutputSurface();
+}
+
+void BlimpCompositor::DidInitializeOutputSurface() {}
+
+void BlimpCompositor::DidFailToInitializeOutputSurface() {}
+
+void BlimpCompositor::WillCommit() {}
+
+void BlimpCompositor::DidCommit() {}
+
+void BlimpCompositor::DidCommitAndDrawFrame() {
+  client_->DidCommitAndDrawFrame();
+}
+
+void BlimpCompositor::DidCompleteSwapBuffers() {
+  client_->DidCompleteSwapBuffers();
+}
+
+void BlimpCompositor::DidCompletePageScaleAnimation() {}
+
+void BlimpCompositor::SetProtoReceiver(ProtoReceiver* receiver) {
+  remote_proto_channel_receiver_ = receiver;
+}
+
+void BlimpCompositor::SendCompositorProto(
+    const cc::proto::CompositorMessage& proto) {
+  client_->SendCompositorMessage(proto);
+}
+
+void BlimpCompositor::OnCompositorMessageReceived(
+    std::unique_ptr<cc::proto::CompositorMessage> message) {
+  DCHECK(message->has_to_impl());
+  const cc::proto::CompositorMessageToImpl& to_impl_proto = message->to_impl();
+
+  DCHECK(to_impl_proto.has_message_type());
+  switch (to_impl_proto.message_type()) {
+    case cc::proto::CompositorMessageToImpl::UNKNOWN:
+      NOTIMPLEMENTED() << "Ignoring message of UNKNOWN type";
+      break;
+    case cc::proto::CompositorMessageToImpl::INITIALIZE_IMPL:
+      DCHECK(!host_);
+      DCHECK(to_impl_proto.has_initialize_impl_message());
+
+      // Create the remote client LayerTreeHost for the compositor.
+      CreateLayerTreeHost();
+      break;
+    case cc::proto::CompositorMessageToImpl::CLOSE_IMPL:
+      DCHECK(host_);
+
+      // Destroy the remote client LayerTreeHost for the compositor.
+      DestroyLayerTreeHost();
+      break;
+    default:
+      // We should have a receiver if we're getting compositor messages that
+      // are not INITIALIZE_IMPL or CLOSE_IMPL.
+      DCHECK(remote_proto_channel_receiver_);
+      remote_proto_channel_receiver_->OnProtoReceived(std::move(message));
+  }
+}
+
+void BlimpCompositor::SendWebGestureEvent(
+    const blink::WebGestureEvent& gesture_event) {
+  client_->SendWebGestureEvent(gesture_event);
+}
+
+void BlimpCompositor::CreateLayerTreeHost() {
+  DCHECK(!host_);
+  VLOG(1) << "Creating LayerTreeHost";
+
+  cc::LayerTreeHost::InitParams host_params;
+  host_params.client = this;
+  host_params.task_graph_runner = task_graph_runner_;
+  host_params.gpu_memory_buffer_manager = gpu_memory_buffer_manager_;
+  host_params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
+  host_params.image_serialization_processor = image_serialization_processor_;
+  host_params.settings = settings_;
+  host_params.animation_host = cc::AnimationHost::CreateMainInstance();
+
+  // Create the LayerTreeHost
+  host_ = cc::LayerTreeHost::CreateRemoteClient(
+      this /* remote_proto_channel */, compositor_task_runner_, &host_params);
+
+  host_->SetVisible(host_should_be_visible_);
+
+  DCHECK(!input_manager_);
+  input_manager_ = BlimpInputManager::Create(
+      this, base::ThreadTaskRunnerHandle::Get(), compositor_task_runner_,
+      host_->GetInputHandler());
+}
+
+void BlimpCompositor::DestroyLayerTreeHost() {
+  DCHECK(host_);
+  VLOG(1) << "Destroying LayerTreeHost";
+
+  // Destroy the old LayerTreeHost state.
+  host_.reset();
+
+  // Destroy the old input manager state.
+  // It is important to destroy the LayerTreeHost before destroying the input
+  // manager as it has a reference to the cc::InputHandlerClient owned by the
+  // BlimpInputManager.
+  input_manager_.reset();
+
+  // Make sure we don't have a receiver at this point.
+  DCHECK(!remote_proto_channel_receiver_);
+}
+
+}  // namespace client
+}  // namespace blimp