layout/ipc/PVsync.ipdl
author Andrew McCreight <continuation@mozilla.com>
Mon, 12 Dec 2016 09:27:58 -0500
changeset 325677 f347515b29ae6f6bdc796261b11f58a3d6f3c8db
parent 321623 fab432069073857f66824c73353a6067fb493286
child 330612 2cded9d87d13294a1417a5bf46db6c64e3c7a951
permissions -rw-r--r--
Bug 1323042 - forbid MOZ_COUNT_{CTOR,DTOR} for nsISupports classes; r=froydnj

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

include protocol PBackground;

using class mozilla::TimeStamp from "mozilla/TimeStamp.h";

namespace mozilla {
namespace layout {

/*
 * The PVsync is a sub-protocol in PBackground and it is used to notify
 * the vsync event from chrome to content process. It also provides the
 * interfaces for content to observe/unobserve vsync event notifications.
 */
async protocol PVsync
{
  manager PBackground;

child:
  // Send vsync event from chrome to content process.
  prio(high) async Notify(TimeStamp aVsyncTimestamp) compress;

  // Send the vsync rate to the content process.
  async VsyncRate(float aVsyncRate);

parent:
  // Content process use these messages to acquire the vsync event.
  async Observe();
  async Unobserve();
  async RequestVsyncRate();

  // This message is never sent. Each PVsync actor will stay alive as long as
  // its PBackground manager.
  async __delete__();
};

} // namespace layout
} // namespace mozilla