blimp: Move BlimpCompositor to use delegated rendering.

blimp/client/core/compositor/blimp_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_BLIMP_OUTPUT_SURFACE_H_
+#define BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_OUTPUT_SURFACE_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "cc/resources/returned_resource.h"
+
+namespace cc {
+class CompositorFrame;
+}
+
+namespace blimp {
+namespace client {
+
+// This class is a proxy for the BlimpOutputSurfaceClient to interact with the
+// DelegatedOutputSurface. It should be called on the compositor thread only.
+class BlimpOutputSurface {
+ public:
+  virtual ~BlimpOutputSurface() {}
+
+  // Sent when the compositor can reclaim the |resources| references in a
+  // compositor frame.
+  virtual void ReclaimCompositorResources(
+      const cc::ReturnedResourceArray& resources) = 0;
+};
+
+// This class is meant to be a proxy for the OutputSurface to interact with the
+// consumer of the CompositorFrames. It should be called on the main thread
+// only.
+class BlimpOutputSurfaceClient {
+ public:
+  virtual ~BlimpOutputSurfaceClient() {}
+
+  // Will be called before any frames are sent to the client. The weak ptr
+  // provided here can be used to post messages to the output surface on the
+  // compositor thread.
+  virtual void BindToOutputSurface(
+      base::WeakPtr<BlimpOutputSurface> output_surface) = 0;
+
+  // The implementation should take the contents of the compositor frame and
+  // return the referenced resources when the frame is no longer being drawn
+  // using BlimpOutputSurface::ReclaimCompositorResources.
+  virtual void SwapCompositorFrame(cc::CompositorFrame frame) = 0;
+
+  // Will be called when the use of the OutputSurface is being terminated. No
+  // calls from this output surface will be made to the client after this point.
+  virtual void UnbindOutputSurface() = 0;
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_OUTPUT_SURFACE_H_