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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/browser/render_tree_combiner.h"
#include <map>
#include <utility>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/optional.h"
#include "base/time.h"
#include "cobalt/render_tree/composition_node.h"
#include "cobalt/render_tree/rect_node.h"
#include "cobalt/renderer/submission.h"
namespace cobalt {
namespace browser {
RenderTreeCombiner::Layer::Layer(RenderTreeCombiner* render_tree_combiner)
: render_tree_combiner_(render_tree_combiner),
render_tree_(base::nullopt),
receipt_time_(base::nullopt) {}
RenderTreeCombiner::Layer::~Layer() {
DCHECK(render_tree_combiner_);
render_tree_combiner_->RemoveLayer(this);
}
void RenderTreeCombiner::Layer::Submit(
const base::optional<renderer::Submission>& render_tree_submission) {
render_tree_ = render_tree_submission;
receipt_time_ = base::TimeTicks::HighResNow();
}
base::optional<renderer::Submission>
RenderTreeCombiner::Layer::GetCurrentSubmission() {
if (!render_tree_) {
return base::nullopt;
}
base::optional<base::TimeDelta> current_time_offset = CurrentTimeOffset();
DCHECK(current_time_offset);
renderer::Submission submission(render_tree_->render_tree,
*current_time_offset);
submission.timeline_info = render_tree_->timeline_info;
submission.on_rasterized_callbacks.assign(
render_tree_->on_rasterized_callbacks.begin(),
render_tree_->on_rasterized_callbacks.end());
return submission;
}
base::optional<base::TimeDelta> RenderTreeCombiner::Layer::CurrentTimeOffset() {
if (!receipt_time_) {
return base::nullopt;
} else {
return render_tree_->time_offset +
(base::TimeTicks::HighResNow() - *receipt_time_);
}
}
RenderTreeCombiner::RenderTreeCombiner() : timeline_layer_(NULL) {}
scoped_ptr<RenderTreeCombiner::Layer> RenderTreeCombiner::CreateLayer(
int z_index) {
if (layers_.count(z_index) > 0) {
return scoped_ptr<RenderTreeCombiner::Layer>(NULL);
}
RenderTreeCombiner::Layer* layer = new Layer(this);
layers_[z_index] = layer;
return scoped_ptr<RenderTreeCombiner::Layer>(layers_[z_index]);
}
void RenderTreeCombiner::SetTimelineLayer(Layer* layer) {
if (layer != NULL) {
DCHECK(OwnsLayer(layer));
}
timeline_layer_ = layer;
}
void RenderTreeCombiner::RemoveLayer(const Layer* layer) {
if (timeline_layer_ == layer) {
SetTimelineLayer(NULL);
}
for (auto it = layers_.begin(); it != layers_.end(); /* no increment */) {
if (it->second == layer) {
it = layers_.erase(it);
} else {
++it;
}
}
}
base::optional<renderer::Submission>
RenderTreeCombiner::GetCurrentSubmission() {
render_tree::CompositionNode::Builder builder;
// Add children for all layers in order.
Layer* first_layer_with_render_tree = NULL;
std::vector<base::Closure> on_rasterized_callbacks;
for (auto it = layers_.begin(); it != layers_.end(); ++it) {
RenderTreeCombiner::Layer* layer = it->second;
if (layer->render_tree_) {
builder.AddChild(layer->render_tree_->render_tree);
first_layer_with_render_tree = layer;
on_rasterized_callbacks.insert(
on_rasterized_callbacks.end(),
layer->render_tree_->on_rasterized_callbacks.begin(),
layer->render_tree_->on_rasterized_callbacks.end());
}
}
if (!first_layer_with_render_tree) {
return base::nullopt;
}
Layer* timeline_layer = (timeline_layer_ && timeline_layer_->render_tree_)
? timeline_layer_
: first_layer_with_render_tree;
renderer::Submission submission(new render_tree::CompositionNode(builder),
*timeline_layer->CurrentTimeOffset());
submission.timeline_info = timeline_layer->render_tree_->timeline_info;
submission.on_rasterized_callbacks = std::move(on_rasterized_callbacks);
return submission;
}
bool RenderTreeCombiner::OwnsLayer(Layer* layer) {
for (const auto& iter_layer : layers_) {
if (iter_layer.second == layer) {
return true;
}
}
return false;
}
} // namespace browser
} // namespace cobalt