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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.
#ifndef CC_LAYERS_LAYER_PROTO_CONVERTER_H_
#define CC_LAYERS_LAYER_PROTO_CONVERTER_H_
#include <unordered_map>
#include "base/macros.h"
#include "cc/base/cc_export.h"
#include "cc/layers/layer.h"
namespace cc {
namespace proto {
class LayerNode;
class LayerUpdate;
}
// A class to faciliate (de)serialization of a Layer tree to protocol buffers.
class CC_EXPORT LayerProtoConverter {
public:
// Starting at |root_layer|, serializes the layer hierarchy into the
// proto::LayerNode.
static void SerializeLayerHierarchy(const scoped_refptr<Layer> root_layer,
proto::LayerNode* root_node);
// Recursively iterate over the given LayerNode proto and read the structure
// into a local Layer structure, re-using existing Layers. returns the new
// root Layer after updating the hierarchy (may be the same as
// |existing_root|). |existing_root| may be null, which might happen during
// the first deserialize.
static scoped_refptr<Layer> DeserializeLayerHierarchy(
const scoped_refptr<Layer> existing_root,
const proto::LayerNode& root_node,
LayerTreeHost* layer_tree_host);
// Serializes the properties of all the dirty nodes in the Layer hierarchy.
// The proto::LayerUpdate will contain all nodes that are dirty. These nodes
// will contain the list of dirty properties. This function also resets the
// layers that need push properties set.
static void SerializeLayerProperties(LayerTreeHost* host,
proto::LayerUpdate* layer_update);
// Iterate over all updated layers from the LayerUpdate, and update the
// local Layers. |existing_root| must not be null, as that will make it
// impossible to find the layer to apply the properties to.
static void DeserializeLayerProperties(
Layer* existing_root,
const proto::LayerUpdate& layer_update);
// Returns the Layer with proto.id() as the Layer id, if it exists in
// |layer_id_map|. Otherwise, a new Layer is constructed of the type given
// from proto.type().
static scoped_refptr<Layer> FindOrAllocateAndConstruct(
const proto::LayerNode& proto,
const Layer::LayerIdMap& layer_id_map);
private:
LayerProtoConverter();
~LayerProtoConverter();
// This method is the inner recursive function for SerializeLayerProperties
// declared above.
static void RecursivelySerializeLayerProperties(
Layer* root_layer,
proto::LayerUpdate* layer_update);
using LayerIdMap = std::unordered_map<int, scoped_refptr<Layer>>;
// Start at |root_layer| and recursively add the layer and all its children
// and special layers to |layer_id_map|.
// TODO(vmpstr): LayerIdMap ref counts layers, so this function needs to deal
// with ref counted objects instead of iterating over raw pointers.
static void RecursivelyFindAllLayers(Layer* root_layer,
LayerIdMap* layer_id_map);
};
} // namespace cc
#endif // CC_LAYERS_LAYER_PROTO_CONVERTER_H_
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