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

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
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* http://www.mozilla.org/MPL/
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* The Original Code is Mozilla Code.
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* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
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include protocol PLayers;
namespace mozilla {
namespace layers {
/**
* PLayer represents a layer shared across thread contexts.
*/
sync protocol PLayer {
manager PLayers;
/**
* OWNERSHIP MODEL
*
* Roughly speaking, the child side "actually owns" a Layer. This
* is because the parent side is the "shadow"; when the child
* releases a Layer, the parent's shadow is no longer meaningful.
*
* To implement this model, the concrete PLayerParent keeps a
* strong ref to its Layer, so the Layer's lifetime is bound to
* the PLayerParent's. Then, when the Layer's refcount hits 0 on
* the child side, we send __delete__() from the child to parent.
* The parent then releases its Layer, which results in the Layer
* being deleted "soon" (usually immediately).
*/
parent:
__delete__();
};
} // layers
} // mozilla