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/* -*- 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 PLayerTransaction;
namespace mozilla {
namespace layers {
/**
* PLayer represents a layer shared across thread contexts.
*/
async protocol PLayer {
manager PLayerTransaction;
/**
* 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:
async __delete__();
};
} // layers
} // mozilla
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