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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/tree_synchronizer.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "cc/layer.h"
#include "cc/layer_impl.h"
#include "cc/scrollbar_animation_controller.h"
#include "cc/scrollbar_layer.h"
#include "cc/scrollbar_layer_impl.h"
namespace cc {
scoped_ptr<LayerImpl> TreeSynchronizer::synchronizeTrees(Layer* layerRoot, scoped_ptr<LayerImpl> oldLayerImplRoot, LayerTreeImpl* treeImpl)
{
DCHECK(treeImpl);
TRACE_EVENT0("cc", "TreeSynchronizer::synchronizeTrees");
ScopedPtrLayerImplMap oldLayers;
RawPtrLayerImplMap newLayers;
collectExistingLayerImplRecursive(oldLayers, oldLayerImplRoot.Pass());
scoped_ptr<LayerImpl> newTree = synchronizeTreeRecursive(newLayers, oldLayers, layerRoot, treeImpl);
updateScrollbarLayerPointersRecursive(newLayers, layerRoot);
return newTree.Pass();
}
void TreeSynchronizer::collectExistingLayerImplRecursive(ScopedPtrLayerImplMap& oldLayers, scoped_ptr<LayerImpl> layerImpl)
{
if (!layerImpl)
return;
ScopedPtrVector<LayerImpl>& children = layerImpl->m_children;
for (ScopedPtrVector<LayerImpl>::iterator it = children.begin(); it != children.end(); ++it)
collectExistingLayerImplRecursive(oldLayers, children.take(it));
collectExistingLayerImplRecursive(oldLayers, layerImpl->takeMaskLayer());
collectExistingLayerImplRecursive(oldLayers, layerImpl->takeReplicaLayer());
int id = layerImpl->id();
oldLayers.set(id, layerImpl.Pass());
}
scoped_ptr<LayerImpl> TreeSynchronizer::reuseOrCreateLayerImpl(RawPtrLayerImplMap& newLayers, ScopedPtrLayerImplMap& oldLayers, Layer* layer, LayerTreeImpl* treeImpl)
{
scoped_ptr<LayerImpl> layerImpl = oldLayers.take(layer->id());
if (!layerImpl)
layerImpl = layer->createLayerImpl(treeImpl);
newLayers[layer->id()] = layerImpl.get();
return layerImpl.Pass();
}
scoped_ptr<LayerImpl> TreeSynchronizer::synchronizeTreeRecursive(RawPtrLayerImplMap& newLayers, ScopedPtrLayerImplMap& oldLayers, Layer* layer, LayerTreeImpl* treeImpl)
{
if (!layer)
return scoped_ptr<LayerImpl>();
scoped_ptr<LayerImpl> layerImpl = reuseOrCreateLayerImpl(newLayers, oldLayers, layer, treeImpl);
layerImpl->clearChildList();
const std::vector<scoped_refptr<Layer> >& children = layer->children();
for (size_t i = 0; i < children.size(); ++i)
layerImpl->addChild(synchronizeTreeRecursive(newLayers, oldLayers, children[i].get(), treeImpl));
layerImpl->setMaskLayer(synchronizeTreeRecursive(newLayers, oldLayers, layer->maskLayer(), treeImpl));
layerImpl->setReplicaLayer(synchronizeTreeRecursive(newLayers, oldLayers, layer->replicaLayer(), treeImpl));
// Remove all dangling pointers. The pointers will be setup later in updateScrollbarLayerPointersRecursive phase
if (ScrollbarAnimationController* scrollbarController = layerImpl->scrollbarAnimationController()) {
scrollbarController->setHorizontalScrollbarLayer(0);
scrollbarController->setVerticalScrollbarLayer(0);
}
return layerImpl.Pass();
}
void TreeSynchronizer::updateScrollbarLayerPointersRecursive(const RawPtrLayerImplMap& newLayers, Layer* layer)
{
if (!layer)
return;
const std::vector<scoped_refptr<Layer> >& children = layer->children();
for (size_t i = 0; i < children.size(); ++i)
updateScrollbarLayerPointersRecursive(newLayers, children[i].get());
ScrollbarLayer* scrollbarLayer = layer->toScrollbarLayer();
if (!scrollbarLayer)
return;
RawPtrLayerImplMap::const_iterator iter = newLayers.find(scrollbarLayer->id());
ScrollbarLayerImpl* scrollbarLayerImpl = iter != newLayers.end() ? static_cast<ScrollbarLayerImpl*>(iter->second) : NULL;
iter = newLayers.find(scrollbarLayer->scrollLayerId());
LayerImpl* scrollLayerImpl = iter != newLayers.end() ? iter->second : NULL;
DCHECK(scrollbarLayerImpl);
DCHECK(scrollLayerImpl);
if (scrollbarLayerImpl->orientation() == WebKit::WebScrollbar::Horizontal)
scrollLayerImpl->setHorizontalScrollbarLayer(scrollbarLayerImpl);
else
scrollLayerImpl->setVerticalScrollbarLayer(scrollbarLayerImpl);
}
void TreeSynchronizer::pushProperties(Layer* layer, LayerImpl* layerImpl)
{
if (!layer) {
DCHECK(!layerImpl);
return;
}
DCHECK_EQ(layer->id(), layerImpl->id());
layer->pushPropertiesTo(layerImpl);
pushProperties(layer->maskLayer(), layerImpl->maskLayer());
pushProperties(layer->replicaLayer(), layerImpl->replicaLayer());
const std::vector<scoped_refptr<Layer> >& children = layer->children();
const ScopedPtrVector<LayerImpl>& implChildren = layerImpl->children();
DCHECK_EQ(children.size(), implChildren.size());
for (size_t i = 0; i < children.size(); ++i) {
pushProperties(children[i].get(), implChildren[i]);
}
}
} // namespace cc
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