gecko/dom/plugins/ipc/PluginBackgroundDestroyer.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: sw=4 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/. */

#ifndef dom_plugins_PluginBackgroundDestroyer
#define dom_plugins_PluginBackgroundDestroyer

#include "mozilla/plugins/PPluginBackgroundDestroyerChild.h"
#include "mozilla/plugins/PPluginBackgroundDestroyerParent.h"

#include "gfxSharedImageSurface.h"

class gfxASurface;

namespace mozilla {
namespace plugins {

/**
 * When instances of this class are destroyed, the old background goes
 * along with them, completing the destruction process (whether or not
 * the plugin stayed alive long enough to ack).
 */
class PluginBackgroundDestroyerParent : public PPluginBackgroundDestroyerParent {
public:
    explicit PluginBackgroundDestroyerParent(gfxASurface* aDyingBackground);

    virtual ~PluginBackgroundDestroyerParent();

private:
    virtual void ActorDestroy(ActorDestroyReason why) MOZ_OVERRIDE;

    nsRefPtr<gfxASurface> mDyingBackground;
};

/**
 * This class exists solely to instruct its instance to release its
 * current background, a new one may be coming.
 */
class PluginBackgroundDestroyerChild : public PPluginBackgroundDestroyerChild {
public:
    PluginBackgroundDestroyerChild() { }
    virtual ~PluginBackgroundDestroyerChild() { }

private:
    // Implementing this for good hygiene.
    virtual void ActorDestroy(ActorDestroyReason why) MOZ_OVERRIDE
    { }
};

} // namespace plugins
} // namespace mozilla

#endif  // dom_plugins_PluginBackgroundDestroyer