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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 "config.h"
#include "cc/tree_synchronizer.h"
#include "CCLayerImpl.h"
#include "CCScrollbarAnimationController.h"
#include "CCScrollbarLayerImpl.h"
#include "cc/layer.h"
#include "cc/scrollbar_layer.h"
namespace cc {
scoped_ptr<CCLayerImpl> TreeSynchronizer::synchronizeTrees(LayerChromium* layerChromiumRoot, scoped_ptr<CCLayerImpl> oldCCLayerImplRoot, CCLayerTreeHostImpl* hostImpl)
{
ScopedPtrCCLayerImplMap oldLayers;
RawPtrCCLayerImplMap newLayers;
collectExistingCCLayerImplRecursive(oldLayers, oldCCLayerImplRoot.Pass());
scoped_ptr<CCLayerImpl> newTree = synchronizeTreeRecursive(newLayers, oldLayers, layerChromiumRoot, hostImpl);
updateScrollbarLayerPointersRecursive(newLayers, layerChromiumRoot);
return newTree.Pass();
}
void TreeSynchronizer::collectExistingCCLayerImplRecursive(ScopedPtrCCLayerImplMap& oldLayers, scoped_ptr<CCLayerImpl> ccLayerImpl)
{
if (!ccLayerImpl)
return;
ScopedPtrVector<CCLayerImpl>& children = ccLayerImpl->m_children;
for (size_t i = 0; i < children.size(); ++i)
collectExistingCCLayerImplRecursive(oldLayers, children.take(i));
collectExistingCCLayerImplRecursive(oldLayers, ccLayerImpl->m_maskLayer.Pass());
collectExistingCCLayerImplRecursive(oldLayers, ccLayerImpl->m_replicaLayer.Pass());
int id = ccLayerImpl->id();
oldLayers.set(id, ccLayerImpl.Pass());
}
scoped_ptr<CCLayerImpl> TreeSynchronizer::reuseOrCreateCCLayerImpl(RawPtrCCLayerImplMap& newLayers, ScopedPtrCCLayerImplMap& oldLayers, LayerChromium* layer)
{
scoped_ptr<CCLayerImpl> ccLayerImpl = oldLayers.take(layer->id());
if (!ccLayerImpl)
ccLayerImpl = layer->createCCLayerImpl();
newLayers[layer->id()] = ccLayerImpl.get();
return ccLayerImpl.Pass();
}
scoped_ptr<CCLayerImpl> TreeSynchronizer::synchronizeTreeRecursive(RawPtrCCLayerImplMap& newLayers, ScopedPtrCCLayerImplMap& oldLayers, LayerChromium* layer, CCLayerTreeHostImpl* hostImpl)
{
if (!layer)
return scoped_ptr<CCLayerImpl>();
scoped_ptr<CCLayerImpl> ccLayerImpl = reuseOrCreateCCLayerImpl(newLayers, oldLayers, layer);
ccLayerImpl->clearChildList();
const std::vector<scoped_refptr<LayerChromium> >& children = layer->children();
for (size_t i = 0; i < children.size(); ++i)
ccLayerImpl->addChild(synchronizeTreeRecursive(newLayers, oldLayers, children[i].get(), hostImpl));
ccLayerImpl->setMaskLayer(synchronizeTreeRecursive(newLayers, oldLayers, layer->maskLayer(), hostImpl));
ccLayerImpl->setReplicaLayer(synchronizeTreeRecursive(newLayers, oldLayers, layer->replicaLayer(), hostImpl));
layer->pushPropertiesTo(ccLayerImpl.get());
ccLayerImpl->setLayerTreeHostImpl(hostImpl);
// Remove all dangling pointers. The pointers will be setup later in updateScrollbarLayerPointersRecursive phase
if (CCScrollbarAnimationController* scrollbarController = ccLayerImpl->scrollbarAnimationController()) {
scrollbarController->setHorizontalScrollbarLayer(0);
scrollbarController->setVerticalScrollbarLayer(0);
}
return ccLayerImpl.Pass();
}
void TreeSynchronizer::updateScrollbarLayerPointersRecursive(const RawPtrCCLayerImplMap& newLayers, LayerChromium* layer)
{
if (!layer)
return;
const std::vector<scoped_refptr<LayerChromium> >& children = layer->children();
for (size_t i = 0; i < children.size(); ++i)
updateScrollbarLayerPointersRecursive(newLayers, children[i].get());
ScrollbarLayerChromium* scrollbarLayer = layer->toScrollbarLayerChromium();
if (!scrollbarLayer)
return;
RawPtrCCLayerImplMap::const_iterator iter = newLayers.find(scrollbarLayer->id());
CCScrollbarLayerImpl* ccScrollbarLayerImpl = iter != newLayers.end() ? static_cast<CCScrollbarLayerImpl*>(iter->second) : NULL;
iter = newLayers.find(scrollbarLayer->scrollLayerId());
CCLayerImpl* ccScrollLayerImpl = iter != newLayers.end() ? iter->second : NULL;
DCHECK(ccScrollbarLayerImpl);
DCHECK(ccScrollLayerImpl);
if (ccScrollbarLayerImpl->orientation() == WebKit::WebScrollbar::Horizontal)
ccScrollLayerImpl->setHorizontalScrollbarLayer(ccScrollbarLayerImpl);
else
ccScrollLayerImpl->setVerticalScrollbarLayer(ccScrollbarLayerImpl);
}
} // namespace cc
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