content/browser/renderer_host/offscreen_canvas_surface_impl.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 CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_
#define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_

#include "cc/surfaces/surface_id.h"
#include "cc/surfaces/surface_id_allocator.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "mojo/public/cpp/bindings/string.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
#include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"

namespace content {

class CONTENT_EXPORT OffscreenCanvasSurfaceImpl
    : public blink::mojom::OffscreenCanvasSurface {
 public:
  OffscreenCanvasSurfaceImpl(
      const cc::FrameSinkId& frame_sink_id,
      blink::mojom::OffscreenCanvasSurfaceClientPtr client);
  ~OffscreenCanvasSurfaceImpl() override;

  static void Create(const cc::FrameSinkId& frame_sink_id,
                     blink::mojom::OffscreenCanvasSurfaceClientPtr client,
                     blink::mojom::OffscreenCanvasSurfaceRequest request);

  void OnSurfaceCreated(const cc::SurfaceId& surface_id,
                        const gfx::Size& frame_size,
                        float device_scale_factor);

  // blink::mojom::OffscreenCanvasSurface implementation.
  void Require(const cc::SurfaceId& surface_id,
               const cc::SurfaceSequence& sequence) override;
  void Satisfy(const cc::SurfaceSequence& sequence) override;

  const cc::FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
  const cc::LocalFrameId& current_local_frame_id() const {
    return current_local_frame_id_;
  }

 private:
  blink::mojom::OffscreenCanvasSurfaceClientPtr client_;
  mojo::StrongBindingPtr<blink::mojom::OffscreenCanvasSurface> binding_;

  // Surface-related state
  cc::FrameSinkId frame_sink_id_;
  cc::LocalFrameId current_local_frame_id_;

  DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasSurfaceImpl);
};

}  // namespace content

#endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_IMPL_H_