third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom

// 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.

module blink.mojom;

import "cc/ipc/frame_sink_id.mojom";
import "cc/ipc/frame_sink_manager.mojom";
import "cc/ipc/mojo_compositor_frame_sink.mojom";
import "cc/ipc/surface_id.mojom";
import "cc/ipc/surface_info.mojom";
import "cc/ipc/surface_sequence.mojom";

interface OffscreenCanvasSurface {
  Require(cc.mojom.SurfaceId surface_id, cc.mojom.SurfaceSequence sequence);
  Satisfy(cc.mojom.SurfaceSequence sequence);
};

interface OffscreenCanvasSurfaceClient {
  OnSurfaceCreated(cc.mojom.SurfaceInfo surface_info);
};

// Creates OffscreenCanvasSurface and MojoCompositorFrameSink instances for use
// with offscreen canvas.
interface OffscreenCanvasProvider {
  // Create an OffscreenCanvasSurface for |frame_sink_id|. |client| will observe
  // any changes to the SurfaceId associated with |frame_sink_id|.
  CreateOffscreenCanvasSurface(cc.mojom.FrameSinkId parent_frame_sink_id,
                               cc.mojom.FrameSinkId frame_sink_id,
                               OffscreenCanvasSurfaceClient client,
                               OffscreenCanvasSurface& surface);

  // Create an MojoCompositorFrameSink for |frame_sink_id|. This must happen
  // after creating an OffsreenCanvasSurface for |frame_sink_id|.
  CreateCompositorFrameSink(cc.mojom.FrameSinkId frame_sink_id,
                            cc.mojom.MojoCompositorFrameSinkClient client,
                            cc.mojom.MojoCompositorFrameSink& sink);
};