gecko/dom/plugins/ipc/PluginBackgroundDestroyer.h

76 lines
2.2 KiB
C
Raw Normal View History

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: sw=4 ts=8 et :
*/
2012-05-21 04:12:37 -07:00
/* 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 "gfxASurface.h"
#include "gfxSharedImageSurface.h"
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:
PluginBackgroundDestroyerParent(gfxASurface* aDyingBackground)
: mDyingBackground(aDyingBackground)
{ }
virtual ~PluginBackgroundDestroyerParent() { }
private:
NS_OVERRIDE
virtual void ActorDestroy(ActorDestroyReason why)
{
switch(why) {
case Deletion:
case AncestorDeletion:
if (gfxSharedImageSurface::IsSharedImage(mDyingBackground)) {
gfxSharedImageSurface* s =
static_cast<gfxSharedImageSurface*>(mDyingBackground.get());
DeallocShmem(s->GetShmem());
}
break;
default:
// We're shutting down or crashed, let automatic cleanup
// take care of our shmem, if we have one.
break;
}
}
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.
NS_OVERRIDE
virtual void ActorDestroy(ActorDestroyReason why)
{ }
};
} // namespace plugins
} // namespace mozilla
#endif // dom_plugins_PluginBackgroundDestroyer