/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* 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 "mozilla/GfxMessageUtils.h";

include protocol PCompositorBridge;

using CSSRect from "Units.h";
using struct mozilla::layers::FrameMetrics from "FrameMetrics.h";
using struct mozilla::layers::ScrollableLayerGuid from "FrameMetrics.h";
using mozilla::layers::FrameMetrics::ViewID from "FrameMetrics.h";
using mozilla::layers::MaybeZoomConstraints from "FrameMetrics.h";
using mozilla::layers::TouchBehaviorFlags from "mozilla/layers/APZUtils.h";
using mozilla::layers::GeckoContentController::APZStateChange from "mozilla/layers/GeckoContentController.h";
using mozilla::dom::TabId from "mozilla/dom/ipc/IdType.h";
using mozilla::dom::ContentParentId from "mozilla/dom/ipc/IdType.h";
using mozilla::layers::AsyncDragMetrics from "mozilla/layers/AsyncDragMetrics.h";
using class nsRegion from "nsRegion.h";

namespace mozilla {
namespace layers {


/**
 * PAPZ is a protocol for remoting a GeckoContentController. PAPZ lives on the
 * PCompositorBridge protocol which either connects to the compositor thread
 * in the main process, or to the compositor thread in the gpu processs.
 *
 * PAPZParent lives in the compositor thread, while PAPZChild lives wherever the remoted
 * GeckoContentController lives (generally the main thread of the main or content process).
 * RemoteContentController implements PAPZParent, while APZChild implements PAPZChild.
 *
 * PAPZ is always used for ContentProcessController and only used for ChromeProcessController
 * when there is a gpu process, otherwhise ChromeProcessController is used directly on the
 * compositor thread. Only the methods that are used by the [Chrome,Content]ProcessController
 * are implemented. If a new method is needed then PAPZ, APZChild, and RemoteContentController
 * must be updated to handle it.
 */
sync protocol PAPZ
{
  manager PCompositorBridge;

parent:

  async __delete__();

child:

  async RequestContentRepaint(FrameMetrics frame);

  async UpdateOverscrollVelocity(float aX, float aY, bool aIsRootContent);

  async UpdateOverscrollOffset(float aX, float aY, bool aIsRootContent);

  async SetScrollingRootContent(bool aIsRootContent);

  async NotifyMozMouseScrollEvent(ViewID aScrollId, nsString aEvent);

  async NotifyAPZStateChange(ScrollableLayerGuid aGuid, APZStateChange aChange, int aArg);

  async NotifyFlushComplete();

  async NotifyAsyncScrollbarDragRejected(ViewID aScrollId);

  async Destroy();
};

} // layers
} // mozilla