gecko/gfx/layers/ipc/CompositorChild.cpp
Benoit Girard 5327c7eaab Bug 805792 - Avoid another extra copie when calling RenderTile. r=Cwiiis
* * *
Bug 805907 - Handle memory pressure notification in the TileStore. r=Cwiiis,ehsan

--HG--
extra : rebase_source : 976deda3ab13c2e178f9a6922b7c17c294175fad
2012-10-29 18:10:45 -04:00

148 lines
4.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=2 et tw=80 : */
/* 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 "CompositorChild.h"
#include "CompositorParent.h"
#include "LayerManagerOGL.h"
#include "mozilla/layers/ShadowLayersChild.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
using mozilla::layers::ShadowLayersChild;
namespace mozilla {
namespace layers {
// Observer for the memory-pressure notification, to trigger
// flushing of stale/low res content.
class MemoryPressureObserver MOZ_FINAL : public nsIObserver,
public nsSupportsWeakReference
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
explicit MemoryPressureObserver(CompositorChild* cc)
: mCC(cc)
{}
private:
CompositorChild* mCC;
};
NS_IMPL_ISUPPORTS2(MemoryPressureObserver, nsIObserver, nsISupportsWeakReference)
NS_IMETHODIMP
MemoryPressureObserver::Observe(nsISupports *aSubject,
const char *aTopic,
const PRUnichar *someData)
{
if (strcmp(aTopic, "memory-pressure") == 0) {
mCC->SendMemoryPressure();
}
return NS_OK;
}
/*static*/ CompositorChild* CompositorChild::sCompositor;
CompositorChild::CompositorChild(LayerManager *aLayerManager)
: mLayerManager(aLayerManager)
{
MOZ_COUNT_CTOR(CompositorChild);
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
mMemoryPressureObserver = new MemoryPressureObserver(this);
obs->AddObserver(mMemoryPressureObserver, "memory-pressure", false);
}
}
CompositorChild::~CompositorChild()
{
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(mMemoryPressureObserver, "memory-pressure");
}
MOZ_COUNT_DTOR(CompositorChild);
}
void
CompositorChild::Destroy()
{
mLayerManager = NULL;
while (size_t len = ManagedPLayersChild().Length()) {
ShadowLayersChild* layers =
static_cast<ShadowLayersChild*>(ManagedPLayersChild()[len - 1]);
layers->Destroy();
}
SendStop();
}
/*static*/ PCompositorChild*
CompositorChild::Create(Transport* aTransport, ProcessId aOtherProcess)
{
// There's only one compositor per child process.
MOZ_ASSERT(!sCompositor);
nsRefPtr<CompositorChild> child(new CompositorChild(nullptr));
ProcessHandle handle;
if (!base::OpenProcessHandle(aOtherProcess, &handle)) {
// We can't go on without a compositor.
NS_RUNTIMEABORT("Couldn't OpenProcessHandle() to parent process.");
return nullptr;
}
if (!child->Open(aTransport, handle, XRE_GetIOMessageLoop(),
AsyncChannel::Child)) {
NS_RUNTIMEABORT("Couldn't Open() Compositor channel.");
return nullptr;
}
// We release this ref in ActorDestroy().
return sCompositor = child.forget().get();
}
/*static*/ PCompositorChild*
CompositorChild::Get()
{
// This is only expected to be used in child processes.
MOZ_ASSERT(XRE_GetProcessType() != GeckoProcessType_Default);
return sCompositor;
}
PLayersChild*
CompositorChild::AllocPLayers(const LayersBackend& aBackendHint,
const uint64_t& aId,
LayersBackend* aBackend,
int* aMaxTextureSize)
{
return new ShadowLayersChild();
}
bool
CompositorChild::DeallocPLayers(PLayersChild* actor)
{
delete actor;
return true;
}
void
CompositorChild::ActorDestroy(ActorDestroyReason aWhy)
{
MOZ_ASSERT(sCompositor == this);
sCompositor = NULL;
// We don't want to release the ref to sCompositor here, during
// cleanup, because that will cause it to be deleted while it's
// still being used. So defer the deletion to after it's not in
// use.
MessageLoop::current()->PostTask(
FROM_HERE,
NewRunnableMethod(this, &CompositorChild::Release));
}
} // namespace layers
} // namespace mozilla