blimp: Move BlimpCompositor to use delegated rendering.

blimp/client/core/compositor/delegated_output_surface.h

+// 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.
+
+#ifndef BLIMP_CLIENT_CORE_COMPOSITOR_DELEGATED_OUTPUT_SURFACE_H_
+#define BLIMP_CLIENT_CORE_COMPOSITOR_DELEGATED_OUTPUT_SURFACE_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "cc/output/output_surface.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace cc {
+class ContextProvider;
+}  // namespace cc
+
+namespace blimp {
+namespace client {
+class OutputSurfaceProxy;
+
+class DelegatedOutputSurface : public cc::OutputSurface {
+ public:
+  DelegatedOutputSurface(
+      scoped_refptr<cc::ContextProvider> compositor_context_provider,
+      scoped_refptr<cc::ContextProvider> worker_context_provider,
+      scoped_refptr<base::SingleThreadTaskRunner> proxy_task_runner,
+      base::WeakPtr<OutputSurfaceProxy> output_surface_proxy);
+
+  ~DelegatedOutputSurface() override;
+
+ private:
+  class OutputSurfaceThreadPipe;
+
+  // cc::OutputSurface implementation.
+  uint32_t GetFramebufferCopyTextureFormat() override;
+  void SwapBuffers(cc::CompositorFrame frame) override;
+  bool BindToClient(cc::OutputSurfaceClient* client) override;
+  void DetachFromClient() override;
+
+  // These hold valid values only until the point when they are passed to the
+  // OutputSurfaceThreadPipe.
+  scoped_refptr<base::SingleThreadTaskRunner> proxy_task_runner_;
+  base::WeakPtr<OutputSurfaceProxy> output_surface_proxy_;
+
+  // The lifetime of this object is tied to the duration for which the
+  // cc::OutputSurface remains bound to its client. It is created on the
+  // compositor thread when the cc::OutputSurface successfully binds to its
+  // client, and destroyed when it is detached.
+  std::unique_ptr<OutputSurfaceThreadPipe> output_surface_thread_pipe_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelegatedOutputSurface);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_CORE_COMPOSITOR_DELEGATED_OUTPUT_SURFACE_H_