Move mus to //services/ui

components/mus/public/interfaces/gpu/display_compositor.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 mus.gpu.mojom;
-
-import "cc/ipc/compositor_frame.mojom";
-import "cc/ipc/returned_resource.mojom";
-
-
-// Indicates whether the submitted CompositorFrame has been drawn to the display
-// or has been skipped (e.g. another frame may have been submitted before
-// vblank).
-enum CompositorFrameDrawStatus {
-  DRAW_SKIPPED,
-  DRAWN
-};
-
-// A CompositorFrameSinkFactory represents a single Display client.
-// The client (a process) can use this interface to create
-// CompositorFrameSinks.
-// TODO(fsamuel): This needs a better name.
-interface CompositorFrameSinkFactory {
-  // Requests a CompositorFrameSink interface from the display compositor.
-  // A CompositorFrameSink has an associated ID consisting of three components:
-  // 1. Namespace picked by the service associated with this
-  //    CompositorFrameSinkFactory.
-  // 2. |local_id| which is a monotonically increasing ID allocated by the
-  //    client.
-  // 3. |nonce| is a cryptographically secure random number making this Sink
-  //    unguessable by other clients.
-  CreateCompositorFrameSink(uint32 local_id,
-                            uint64 nonce,
-                            CompositorFrameSink& sink,
-                            CompositorFrameSinkClient client);
-};
-
-// A CompositorFrameSink is an interface for receiving CompositorFrame structs.
-// A CompositorFrame contains the complete output meant for display. Each time a
-// client has a graphical update, and receives an OnBeginFrame, it is
-// responsible for creating a CompositorFrame to update its portion of the
-// screen.
-interface CompositorFrameSink {
-  // After the submitted frame is either drawn for the first time by the display
-  // compositor or discarded, the callback will be called with the status of the
-  // submitted frame. Clients should use this acknowledgement to ratelimit frame
-  // submissions.
-  // TODO(fsamuel): We should support identifying the CF in the callback.
-  SubmitCompositorFrame(cc.mojom.CompositorFrame frame) =>
-      (CompositorFrameDrawStatus status);
-
-  // Lets the display compositor know that the client wishes to receive the next
-  // BeginFrame event.
-  SetNeedsBeginFrame(bool needs_begin_frame);
-
-  // TODO(fsamuel): ReadbackBitmap API would be useful here.
-};
-
-interface CompositorFrameSinkClient {
-  ReturnResources(array<cc.mojom.ReturnedResource> resources);
-};
-
-// This is a public interface implemented by Display clients.
-// Each client implements a single instance of the DisplayClient interface.
-interface DisplayClient {
-  // Clients can register CompositorFrameSinks via the provided |factory|.
-  OnClientCreated(uint32 client_id, CompositorFrameSinkFactory factory);
-
-  // TODO(fsamuel): OnBeginFrame needs to take a BeginFrameArgs instance per
-  // cc/output/begin_frame_args.h.
-  OnBeginFrame();
-};