blimp: Move BlimpCompositor to use delegated rendering.

blimp/client/app/compositor/browser_compositor.cc

Index: blimp/client/app/compositor/browser_compositor.cc
diff --git a/blimp/client/app/compositor/browser_compositor.cc b/blimp/client/app/compositor/browser_compositor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..280b2cf3c504181326663a136e2b05b282227c7c
--- /dev/null
+++ b/blimp/client/app/compositor/browser_compositor.cc
@@ -0,0 +1,225 @@
+// Copyright 2016 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/app/compositor/browser_compositor.h"
+
+#include "base/lazy_instance.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "blimp/client/feature/compositor/blimp_context_provider.h"
+#include "blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.h"
+#include "cc/animation/animation_host.h"
+#include "cc/layers/layer.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/texture_mailbox_deleter.h"
+#include "cc/raster/single_thread_task_graph_runner.h"
+#include "cc/surfaces/display.h"
+#include "cc/surfaces/surface_display_output_surface.h"
+#include "cc/surfaces/surface_id_allocator.h"
+#include "cc/surfaces/surface_manager.h"
+#include "cc/trees/layer_tree_host.h"
+#include "gpu/command_buffer/client/context_support.h"
+
+namespace blimp {
+namespace client {
+
+namespace {
+
+class SimpleTaskGraphRunner : public cc::SingleThreadTaskGraphRunner {
+ public:
+  SimpleTaskGraphRunner() {
+    Start("BlimpBrowserCompositorWorker",
+          base::SimpleThread::Options(base::ThreadPriority::BACKGROUND));
+  }
+
+  ~SimpleTaskGraphRunner() override { Shutdown(); }
+};
+
+class DisplayOutputSurface : public cc::OutputSurface {
+ public:
+  explicit DisplayOutputSurface(
+      scoped_refptr<cc::ContextProvider> context_provider)
+      : cc::OutputSurface(std::move(context_provider), nullptr, nullptr) {}
+
+  ~DisplayOutputSurface() override = default;
+
+  // cc::OutputSurface implementation
+  void SwapBuffers(cc::CompositorFrame frame) override {
+    // See cc::OutputSurface::SwapBuffers() comment for details.
+    context_provider_->ContextSupport()->Swap();
+    cc::OutputSurface::PostSwapBuffersComplete();
+  }
+
+  uint32_t GetFramebufferCopyTextureFormat() override {
+    auto* gl = static_cast<BlimpContextProvider*>(context_provider());
+    return gl->GetCopyTextureInternalFormat();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplayOutputSurface);
+};
+
+base::LazyInstance<SimpleTaskGraphRunner> g_task_graph_runner =
+    LAZY_INSTANCE_INITIALIZER;
+
+base::LazyInstance<cc::SurfaceManager> g_surface_manager =
+    LAZY_INSTANCE_INITIALIZER;
+
+base::LazyInstance<BlimpGpuMemoryBufferManager> g_gpu_memory_buffer_manager =
+    LAZY_INSTANCE_INITIALIZER;
+
+uint32_t g_surface_id = 0;
+
+}  // namespace
+
+// static
+cc::SurfaceManager* BrowserCompositor::GetSurfaceManager() {
+  return g_surface_manager.Pointer();
+}
+
+// static
+BlimpGpuMemoryBufferManager* BrowserCompositor::GetGpuMemoryBufferManager() {
+  return g_gpu_memory_buffer_manager.Pointer();
+}
+
+// static
+uint32_t BrowserCompositor::AllocateSurfaceClientId() {
+  return ++g_surface_id;
+}
+
+BrowserCompositor::BrowserCompositor()
+    : surface_id_allocator_(base::MakeUnique<cc::SurfaceIdAllocator>(
+          BrowserCompositor::AllocateSurfaceClientId())),
+      widget_(gfx::kNullAcceleratedWidget),
+      output_surface_request_pending_(false),
+      root_layer_(cc::Layer::Create()) {
+  BrowserCompositor::GetSurfaceManager()->RegisterSurfaceClientId(
+      surface_id_allocator_->client_id());
+
+  cc::LayerTreeHost::InitParams params;
+  params.client = this;
+  params.gpu_memory_buffer_manager =
+      BrowserCompositor::GetGpuMemoryBufferManager();
+  params.task_graph_runner = g_task_graph_runner.Pointer();
+  cc::LayerTreeSettings settings;
+  params.settings = &settings;
+  params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
+  params.animation_host = cc::AnimationHost::CreateMainInstance();
+  host_ = cc::LayerTreeHost::CreateSingleThreaded(this, &params);
+
+  root_layer_->SetBackgroundColor(SK_ColorWHITE);
+  host_->GetLayerTree()->SetRootLayer(root_layer_);
+  host_->set_surface_client_id(surface_id_allocator_->client_id());
+}
+
+BrowserCompositor::~BrowserCompositor() {
+  BrowserCompositor::GetSurfaceManager()->InvalidateSurfaceClientId(
+      surface_id_allocator_->client_id());
+}
+
+void BrowserCompositor::SetContentLayer(
+    scoped_refptr<cc::Layer> content_layer) {
+  root_layer_->RemoveAllChildren();
+  root_layer_->AddChild(content_layer);
+}
+
+void BrowserCompositor::SetSize(const gfx::Size& size_in_px) {
+  viewport_size_in_px_ = size_in_px;
+
+  // Update the host.
+  host_->GetLayerTree()->SetViewportSize(viewport_size_in_px_);
+  root_layer_->SetBounds(viewport_size_in_px_);
+
+  // Update the display.
+  if (display_) {
+    display_->Resize(viewport_size_in_px_);
+  }
+}
+
+void BrowserCompositor::SetAcceleratedWidget(gfx::AcceleratedWidget widget) {
+  // Kill all references to the old widget.
+  if (widget_ != gfx::kNullAcceleratedWidget) {
+    // We are always visible if we have a widget.
+    DCHECK(host_->visible());
+    host_->SetVisible(false);
+    if (!host_->output_surface_lost()) {
+      host_->ReleaseOutputSurface();
+    }
+    display_.reset();
+  }
+
+  widget_ = gfx::kNullAcceleratedWidget;
+
+  if (widget != gfx::kNullAcceleratedWidget) {
+    widget_ = widget;
+    host_->SetVisible(true);
+    if (output_surface_request_pending_)
+      HandlePendingOutputSurfaceRequest();
+  }
+}
+
+void BrowserCompositor::RequestNewOutputSurface() {
+  DCHECK(!output_surface_request_pending_)
+      << "We already have a pending request?";
+  output_surface_request_pending_ = true;
+  HandlePendingOutputSurfaceRequest();
+}
+
+void BrowserCompositor::DidInitializeOutputSurface() {
+  output_surface_request_pending_ = false;
+}
+
+void BrowserCompositor::DidFailToInitializeOutputSurface() {
+  NOTREACHED() << "Can't fail to initialize the OutputSurface here";
+}
+
+void BrowserCompositor::DidCompleteSwapBuffers() {
+  if (!did_complete_swap_buffers_.is_null()) {
+    did_complete_swap_buffers_.Run();
+  }
+}
+
+void BrowserCompositor::HandlePendingOutputSurfaceRequest() {
+  DCHECK(output_surface_request_pending_);
+
+  // Can't handle the request right now since we don't have a widget.
+  if (!host_->visible())
+    return;
+
+  DCHECK_NE(gfx::kNullAcceleratedWidget, widget_);
+
+  scoped_refptr<cc::ContextProvider> context_provider =
+      BlimpContextProvider::Create(
+          widget_, BrowserCompositor::GetGpuMemoryBufferManager());
+
+  std::unique_ptr<cc::OutputSurface> display_output_surface =
+      base::MakeUnique<DisplayOutputSurface>(context_provider);
+
+  auto* task_runner = base::ThreadTaskRunnerHandle::Get().get();
+  std::unique_ptr<cc::SyntheticBeginFrameSource> begin_frame_source(
+      new cc::DelayBasedBeginFrameSource(
+          base::MakeUnique<cc::DelayBasedTimeSource>(task_runner)));
+  std::unique_ptr<cc::DisplayScheduler> scheduler(new cc::DisplayScheduler(
+      begin_frame_source.get(), task_runner,
+      display_output_surface->capabilities().max_frames_pending));
+
+  display_ = base::MakeUnique<cc::Display>(
+      nullptr /*shared_bitmap_manager*/,
+      BrowserCompositor::GetGpuMemoryBufferManager(),
+      host_->settings().renderer_settings, std::move(begin_frame_source),
+      std::move(display_output_surface), std::move(scheduler),
+      base::MakeUnique<cc::TextureMailboxDeleter>(task_runner));
+  display_->SetVisible(true);
+  display_->Resize(viewport_size_in_px_);
+
+  // The Browser compositor and display share the same context provider.
+  std::unique_ptr<cc::OutputSurface> delegated_output_surface =
+      base::MakeUnique<cc::SurfaceDisplayOutputSurface>(
+          BrowserCompositor::GetSurfaceManager(), surface_id_allocator_.get(),
+          display_.get(), context_provider, nullptr);
+
+  host_->SetOutputSurface(std::move(delegated_output_surface));
+}
+
+}  // namespace client
+}  // namespace blimp