static LayerActivity*
GetLayerActivity(nsIFrame* aFrame)
{
if (!aFrame->HasAnyStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY)) {
return nullptr;
}
FrameProperties properties = aFrame->Properties();
return static_cast<LayerActivity*>(properties.Get(LayerActivityProperty()));
}
static LayerActivity*
GetLayerActivityForUpdate(nsIFrame* aFrame)
{
FrameProperties properties = aFrame->Properties();
LayerActivity* layerActivity =
static_cast<LayerActivity*>(properties.Get(LayerActivityProperty()));
if (layerActivity) {
gLayerActivityTracker->MarkUsed(layerActivity);
} else {
if (!gLayerActivityTracker) {
gLayerActivityTracker = new LayerActivityTracker();
}
layerActivity = new LayerActivity(aFrame);
gLayerActivityTracker->AddObject(layerActivity);
aFrame->AddStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
properties.Set(LayerActivityProperty(), layerActivity);
}
return layerActivity;
}
/* static */ void
ActiveLayerTracker::TransferActivityToFrame(nsIContent* aContent, nsIFrame* aFrame)
{
LayerActivity* layerActivity = static_cast<LayerActivity*>(
aContent->UnsetProperty(nsGkAtoms::LayerActivity));
if (!layerActivity) {
return;
}
layerActivity->mContent = nullptr;
layerActivity->mFrame = aFrame;
aFrame->AddStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
aFrame->Properties().Set(LayerActivityProperty(), layerActivity);
}
/* static */ void
ActiveLayerTracker::TransferActivityToContent(nsIFrame* aFrame, nsIContent* aContent)
{
if (!aFrame->HasAnyStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY)) {
return;
}
FrameProperties properties = aFrame->Properties();
LayerActivity* layerActivity = properties.Remove(LayerActivityProperty());
aFrame->RemoveStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
if (!layerActivity) {
return;
}
layerActivity->mFrame = nullptr;
layerActivity->mContent = aContent;
aContent->SetProperty(nsGkAtoms::LayerActivity, layerActivity,
nsINode::DeleteProperty<LayerActivity>, true);
}