cc/tree_synchronizer.cc

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6
   7 #include "TreeSynchronizer.h"
   8
   9 #include "CCLayerImpl.h"
  10 #include "CCScrollbarAnimationController.h"
  11 #include "CCScrollbarLayerImpl.h"
  12 #include "LayerChromium.h"
  13 #include "ScrollbarLayerChromium.h"
  14
  15 namespace cc {
  16
  17 scoped_ptr<CCLayerImpl> TreeSynchronizer::synchronizeTrees(LayerChromium* layerChromiumRoot, scoped_ptr<CCLayerImpl> oldCCLayerImplRoot, CCLayerTreeHostImpl* hostImpl)
  18 {
  19     ScopedPtrCCLayerImplMap oldLayers;
  20     RawPtrCCLayerImplMap newLayers;
  21
  22     collectExistingCCLayerImplRecursive(oldLayers, oldCCLayerImplRoot.Pass());
  23
  24     scoped_ptr<CCLayerImpl> newTree = synchronizeTreeRecursive(newLayers, oldLayers, layerChromiumRoot, hostImpl);
  25
  26     updateScrollbarLayerPointersRecursive(newLayers, layerChromiumRoot);
  27
  28     return newTree.Pass();
  29 }
  30
  31 void TreeSynchronizer::collectExistingCCLayerImplRecursive(ScopedPtrCCLayerImplMap& oldLayers, scoped_ptr<CCLayerImpl> ccLayerImpl)
  32 {
  33     if (!ccLayerImpl)
  34         return;
  35
  36     ScopedPtrVector<CCLayerImpl>& children = ccLayerImpl->m_children;
  37     for (size_t i = 0; i < children.size(); ++i)
  38         collectExistingCCLayerImplRecursive(oldLayers, children.take(i));
  39
  40     collectExistingCCLayerImplRecursive(oldLayers, ccLayerImpl->m_maskLayer.Pass());
  41     collectExistingCCLayerImplRecursive(oldLayers, ccLayerImpl->m_replicaLayer.Pass());
  42
  43     int id = ccLayerImpl->id();
  44     oldLayers.set(id, ccLayerImpl.Pass());
  45 }
  46
  47 scoped_ptr<CCLayerImpl> TreeSynchronizer::reuseOrCreateCCLayerImpl(RawPtrCCLayerImplMap& newLayers, ScopedPtrCCLayerImplMap& oldLayers, LayerChromium* layer)
  48 {
  49     scoped_ptr<CCLayerImpl> ccLayerImpl = oldLayers.take(layer->id());
  50
  51     if (!ccLayerImpl)
  52         ccLayerImpl = layer->createCCLayerImpl();
  53
  54     newLayers[layer->id()] = ccLayerImpl.get();
  55     return ccLayerImpl.Pass();
  56 }
  57
  58 scoped_ptr<CCLayerImpl> TreeSynchronizer::synchronizeTreeRecursive(RawPtrCCLayerImplMap& newLayers, ScopedPtrCCLayerImplMap& oldLayers, LayerChromium* layer, CCLayerTreeHostImpl* hostImpl)
  59 {
  60     if (!layer)
  61         return scoped_ptr<CCLayerImpl>();
  62
  63     scoped_ptr<CCLayerImpl> ccLayerImpl = reuseOrCreateCCLayerImpl(newLayers, oldLayers, layer);
  64
  65     ccLayerImpl->clearChildList();
  66     const std::vector<scoped_refptr<LayerChromium> >& children = layer->children();
  67     for (size_t i = 0; i < children.size(); ++i)
  68         ccLayerImpl->addChild(synchronizeTreeRecursive(newLayers, oldLayers, children[i].get(), hostImpl));
  69
  70     ccLayerImpl->setMaskLayer(synchronizeTreeRecursive(newLayers, oldLayers, layer->maskLayer(), hostImpl));
  71     ccLayerImpl->setReplicaLayer(synchronizeTreeRecursive(newLayers, oldLayers, layer->replicaLayer(), hostImpl));
  72
  73     layer->pushPropertiesTo(ccLayerImpl.get());
  74     ccLayerImpl->setLayerTreeHostImpl(hostImpl);
  75
  76     // Remove all dangling pointers. The pointers will be setup later in updateScrollbarLayerPointersRecursive phase
  77     if (CCScrollbarAnimationController* scrollbarController = ccLayerImpl->scrollbarAnimationController()) {
  78         scrollbarController->setHorizontalScrollbarLayer(0);
  79         scrollbarController->setVerticalScrollbarLayer(0);
  80     }
  81
  82     return ccLayerImpl.Pass();
  83 }
  84
  85 void TreeSynchronizer::updateScrollbarLayerPointersRecursive(const RawPtrCCLayerImplMap& newLayers, LayerChromium* layer)
  86 {
  87     if (!layer)
  88         return;
  89
  90     const std::vector<scoped_refptr<LayerChromium> >& children = layer->children();
  91     for (size_t i = 0; i < children.size(); ++i)
  92         updateScrollbarLayerPointersRecursive(newLayers, children[i].get());
  93
  94     ScrollbarLayerChromium* scrollbarLayer = layer->toScrollbarLayerChromium();
  95     if (!scrollbarLayer)
  96         return;
  97
  98     RawPtrCCLayerImplMap::const_iterator iter = newLayers.find(scrollbarLayer->id());
  99     CCScrollbarLayerImpl* ccScrollbarLayerImpl = iter != newLayers.end() ? static_cast<CCScrollbarLayerImpl*>(iter->second) : NULL;
 100     iter = newLayers.find(scrollbarLayer->scrollLayerId());
 101     CCLayerImpl* ccScrollLayerImpl = iter != newLayers.end() ? iter->second : NULL;
 102
 103     ASSERT(ccScrollbarLayerImpl);
 104     ASSERT(ccScrollLayerImpl);
 105
 106     if (ccScrollbarLayerImpl->orientation() == WebKit::WebScrollbar::Horizontal)
 107         ccScrollLayerImpl->setHorizontalScrollbarLayer(ccScrollbarLayerImpl);
 108     else
 109         ccScrollLayerImpl->setVerticalScrollbarLayer(ccScrollbarLayerImpl);
 110 }
 111
 112 } // namespace cc