gecko-dev/gfx/layers/ipc/PCompositor.ipdl

/* -*- 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 protocol PLayers;

using mozilla::layers::LayersBackend;
using mozilla::null_t;

namespace mozilla {
namespace layers {

/**
 * The PCompositor protocol is used to manage communication between
 * the main thread and the compositor thread context. It's primary
 * purpose is to manage the PLayers sub protocol.
 */
// This should really be 'sync', but we're using 'rpc' as a workaround
// for Bug 716631.
rpc protocol PCompositor
{
  // A Compositor manages a single Layer Manager (PLayers)
  manages PLayers;

parent:  

  // The child is about to be destroyed, so perform any necessary cleanup.
  sync WillStop();

  // Clean up in preparation for own destruction.
  sync Stop();

  // Pause/resume the compositor. These are intended to be used on mobile, when
  // the compositor needs to pause/resume in lockstep with the application.
  sync Pause();
  sync Resume();

  sync PLayers(LayersBackend backendHint, uint64_t id)
    returns (LayersBackend backend, int32_t maxTextureSize);
};

} // layers
} // mozilla