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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/layer_tree_impl.h"
#include "cc/layer_tree_host_common.h"
#include "cc/layer_tree_host_impl.h"
namespace cc {
LayerTreeImpl::LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl)
: layer_tree_host_impl_(layer_tree_host_impl)
, source_frame_number_(-1)
, hud_layer_(0)
, root_scroll_layer_(0)
, currently_scrolling_layer_(0)
, scrolling_layer_id_from_previous_tree_(0) {
}
LayerTreeImpl::~LayerTreeImpl() {
// Need to explicitly clear the tree prior to destroying this so that
// the LayerTreeImpl pointer is still valid in the LayerImpl dtor.
root_layer_.reset();
}
static LayerImpl* findRootScrollLayer(LayerImpl* layer)
{
if (!layer)
return 0;
if (layer->scrollable())
return layer;
for (size_t i = 0; i < layer->children().size(); ++i) {
LayerImpl* found = findRootScrollLayer(layer->children()[i]);
if (found)
return found;
}
return 0;
}
void LayerTreeImpl::SetRootLayer(scoped_ptr<LayerImpl> layer) {
root_layer_ = layer.Pass();
root_scroll_layer_ = findRootScrollLayer(root_layer_.get());
currently_scrolling_layer_ = 0;
if (root_layer_ && scrolling_layer_id_from_previous_tree_) {
currently_scrolling_layer_ = LayerTreeHostCommon::findLayerInSubtree(
root_layer_.get(),
scrolling_layer_id_from_previous_tree_);
}
scrolling_layer_id_from_previous_tree_ = 0;
layer_tree_host_impl_->OnCanDrawStateChangedForTree(this);
}
scoped_ptr<LayerImpl> LayerTreeImpl::DetachLayerTree() {
// Clear all data structures that have direct references to the layer tree.
scrolling_layer_id_from_previous_tree_ =
currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0;
currently_scrolling_layer_ = NULL;
return root_layer_.Pass();
}
void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
currently_scrolling_layer_ = NULL;
scrolling_layer_id_from_previous_tree_ = 0;
}
LayerImpl* LayerTreeImpl::LayerById(int id) {
LayerIdMap::iterator iter = layer_id_map_.find(id);
return iter != layer_id_map_.end() ? iter->second : NULL;
}
void LayerTreeImpl::RegisterLayer(LayerImpl* layer) {
DCHECK(!LayerById(layer->id()));
layer_id_map_[layer->id()] = layer;
}
void LayerTreeImpl::UnregisterLayer(LayerImpl* layer) {
DCHECK(LayerById(layer->id()));
layer_id_map_.erase(layer->id());
}
const LayerTreeSettings& LayerTreeImpl::settings() const {
return layer_tree_host_impl_->settings();
}
OutputSurface* LayerTreeImpl::output_surface() const {
return layer_tree_host_impl_->outputSurface();
}
ResourceProvider* LayerTreeImpl::resource_provider() const {
return layer_tree_host_impl_->resourceProvider();
}
TileManager* LayerTreeImpl::tile_manager() const {
return layer_tree_host_impl_->tileManager();
}
FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {
return layer_tree_host_impl_->fpsCounter();
}
bool LayerTreeImpl::IsActiveTree() const {
return layer_tree_host_impl_->activeTree() == this;
}
bool LayerTreeImpl::IsPendingTree() const {
return layer_tree_host_impl_->pendingTree() == this;
}
LayerImpl* LayerTreeImpl::FindActiveTreeLayerById(int id) {
LayerTreeImpl* tree = layer_tree_host_impl_->activeTree();
if (!tree)
return NULL;
return tree->LayerById(id);
}
LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
LayerTreeImpl* tree = layer_tree_host_impl_->pendingTree();
if (!tree)
return NULL;
return tree->LayerById(id);
}
void LayerTreeImpl::SetNeedsRedraw() {
layer_tree_host_impl_->setNeedsRedraw();
}
void LayerTreeImpl::SetNeedsUpdateDrawProperties() {
layer_tree_host_impl_->setNeedsUpdateDrawProperties();
}
const LayerTreeDebugState& LayerTreeImpl::debug_state() const {
return layer_tree_host_impl_->debugState();
}
float LayerTreeImpl::device_scale_factor() const {
return layer_tree_host_impl_->deviceScaleFactor();
}
const gfx::Size& LayerTreeImpl::device_viewport_size() const {
return layer_tree_host_impl_->deviceViewportSize();
}
const gfx::Size& LayerTreeImpl::layout_viewport_size() const {
return layer_tree_host_impl_->layoutViewportSize();
}
std::string LayerTreeImpl::layer_tree_as_text() const {
return layer_tree_host_impl_->layerTreeAsText();
}
DebugRectHistory* LayerTreeImpl::debug_rect_history() const {
return layer_tree_host_impl_->debugRectHistory();
}
} // namespace cc
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