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// Copyright 2015 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/layers/layer_proto_converter.h"
#include "base/stl_util.h"
#include "cc/layers/empty_content_layer_client.h"
#include "cc/layers/heads_up_display_layer.h"
#include "cc/layers/layer.h"
#include "cc/layers/picture_layer.h"
#include "cc/proto/layer.pb.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_host_common.h"
#include "cc/trees/layer_tree_settings.h"
namespace cc {
LayerProtoConverter::LayerProtoConverter() {}
LayerProtoConverter::~LayerProtoConverter() {}
// static
void LayerProtoConverter::SerializeLayerHierarchy(
const scoped_refptr<Layer> root_layer,
proto::LayerNode* root_node) {
root_layer->ToLayerNodeProto(root_node);
}
// static
scoped_refptr<Layer> LayerProtoConverter::DeserializeLayerHierarchy(
scoped_refptr<Layer> existing_root,
const proto::LayerNode& root_node,
LayerTreeHost* layer_tree_host) {
LayerIdMap layer_id_map;
if (existing_root) {
existing_root->ClearLayerTreePropertiesForDeserializationAndAddToMap(
&layer_id_map);
}
scoped_refptr<Layer> new_root = existing_root;
if (!existing_root ||
(root_node.has_id() && root_node.id() != existing_root->id())) {
// The root node has changed or there was no root node,
// so find or create the new root.
new_root = FindOrAllocateAndConstruct(root_node, layer_id_map);
}
new_root->FromLayerNodeProto(root_node, layer_id_map, layer_tree_host);
return new_root;
}
// static
void LayerProtoConverter::SerializeLayerProperties(
LayerTreeHost* host,
proto::LayerUpdate* layer_update) {
for (auto layer : host->LayersThatShouldPushProperties())
layer->ToLayerPropertiesProto(layer_update);
host->LayersThatShouldPushProperties().clear();
}
// static
void LayerProtoConverter::DeserializeLayerProperties(
Layer* existing_root,
const proto::LayerUpdate& layer_update) {
DCHECK(existing_root);
LayerIdMap layer_id_map;
RecursivelyFindAllLayers(existing_root, &layer_id_map);
for (int i = 0; i < layer_update.layers_size(); ++i) {
const proto::LayerProperties& layer_properties = layer_update.layers(i);
Layer::LayerIdMap::const_iterator iter =
layer_id_map.find(layer_properties.id());
DCHECK(iter != layer_id_map.end());
iter->second->FromLayerPropertiesProto(layer_properties);
}
}
// static
void LayerProtoConverter::RecursivelyFindAllLayers(Layer* root_layer,
LayerIdMap* layer_id_map) {
LayerTreeHostCommon::CallFunctionForSubtree(
root_layer,
[layer_id_map](Layer* layer) { (*layer_id_map)[layer->id()] = layer; });
}
// static
scoped_refptr<Layer> LayerProtoConverter::FindOrAllocateAndConstruct(
const proto::LayerNode& proto,
const Layer::LayerIdMap& layer_id_map) {
DCHECK(proto.has_id());
Layer::LayerIdMap::const_iterator iter = layer_id_map.find(proto.id());
if (iter != layer_id_map.end())
return iter->second;
DCHECK(proto.has_type());
switch (proto.type()) {
// Fall through and build a base layer. This won't have any special layer
// properties but still maintains the layer hierarchy if we run into a
// layer type we don't support.
case proto::LayerNode::UNKNOWN:
case proto::LayerNode::LAYER:
return Layer::Create().get();
case proto::LayerNode::PICTURE_LAYER:
return PictureLayer::Create(EmptyContentLayerClient::GetInstance());
case proto::LayerNode::HEADS_UP_DISPLAY_LAYER:
return HeadsUpDisplayLayer::Create();
}
// TODO(nyquist): Add the rest of the necessary LayerTypes. This function
// should not return null.
NOTREACHED();
return nullptr;
}
} // namespace cc
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