gecko/gfx/layers/ipc/PLayerTransaction.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 LayersSurfaces;
include LayerTransaction;
include protocol PCompositable;
include protocol PCompositor;
include protocol PGrallocBuffer;
include protocol PLayer;
include protocol PRenderFrame;

include "mozilla/WidgetUtils.h";
include "mozilla/TimeStamp.h";
include "mozilla/dom/ScreenOrientation.h";
include "nsCSSProperty.h";
include "gfxipc/ShadowLayerUtils.h";

using mozilla::layers::TextureInfo;

/**
 * The layers protocol is spoken between thread contexts that manage
 * layer (sub)trees.  The protocol comprises atomically publishing
 * layer subtrees to a "shadow" thread context (which grafts the
 * subtree into its own tree), and atomically updating a published
 * subtree.  ("Atomic" in this sense is wrt painting.)
 */

namespace mozilla {
namespace layers {

sync protocol PLayerTransaction {
  manager PRenderFrame or PCompositor;
  manages PLayer;
  manages PCompositable;
  manages PGrallocBuffer;

parent:
  /**
   * Only the parent side has privileges to allocate the buffer.
   * Allocation may fail (pmem is a scarce resource), and if so null_t
   * is returned.
   */
  sync PGrallocBuffer(gfxIntSize size, gfxContentType content)
    returns (MaybeMagicGrallocBufferHandle handle);
  async PLayer();
  async PCompositable(TextureInfo aTextureInfo);

  // The isFirstPaint flag can be used to indicate that this is the first update
  // for a particular document.
  sync Update(Edit[] cset, TargetConfig targetConfig, bool isFirstPaint)
    returns (EditReply[] reply);

  // We don't need to send a sync transaction if
  // no transaction operate require a swap.
  async UpdateNoSwap(Edit[] cset, TargetConfig targetConfig, bool isFirstPaint);

  // Drop any front buffers that might be retained on the compositor
  // side.
  async ClearCachedResources();

  async __delete__();
};

} // namespace layers
} // namespace mozilla