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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 "base/macros.h"
#include "cc/base/cc_export.h"
#include "cc/layers/layer.h"
namespace cc {
namespace proto {
class LayerNode;
}
// 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|).
static scoped_refptr<Layer> DeserializeLayerHierarchy(
scoped_refptr<Layer> existing_root,
const proto::LayerNode& root_node);
// 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();
using LayerIdMap = base::hash_map<int, scoped_refptr<Layer>>;
// Start at |layer| and recursively add |layer| and all its children and
// special layers to |layer_id_map|.
static void RecursivelyFindAllLayers(const scoped_refptr<Layer>& layer,
LayerIdMap* layer_id_map);
};
} // namespace cc
#endif // CC_LAYERS_LAYER_PROTO_CONVERTER_H_
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