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 "blimp/client/core/compositor/blimp_output_surface.h"
+#include "cc/output/output_surface.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace cc {
+class ContextProvider;
+}  // namespace cc
+
+namespace blimp {
+namespace client {
+
+// This class is created on the main thread, but then becomes bound to the
+// compositor thread and will be destroyed there (soon, crbug.com/640730).
+class DelegatedOutputSurface : public cc::OutputSurface,
+                               public BlimpOutputSurface {
+ public:
+  DelegatedOutputSurface(
+      scoped_refptr<cc::ContextProvider> compositor_context_provider,
+      scoped_refptr<cc::ContextProvider> worker_context_provider,
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+      base::WeakPtr<BlimpOutputSurfaceClient> client);
+
+  ~DelegatedOutputSurface() override;
+
+  // cc::OutputSurface implementation.
+  uint32_t GetFramebufferCopyTextureFormat() override;
+  bool BindToClient(cc::OutputSurfaceClient* client) override;
+  void SwapBuffers(cc::CompositorFrame frame) override;
+  void DetachFromClient() override;
+
+  // BlimpOutputSurface implementation.
+  void ReclaimCompositorResources(
+      const cc::ReturnedResourceArray& resources) override;
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
+  base::WeakPtr<BlimpOutputSurfaceClient> client_;
+
+  bool bound_to_client_;
+
+  base::WeakPtrFactory<DelegatedOutputSurface> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelegatedOutputSurface);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_CORE_COMPOSITOR_DELEGATED_OUTPUT_SURFACE_H_