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// Copyright 2016 The Draco Authors.
//
// 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.
//
#ifndef DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
#define DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
#include <vector>
#include "draco/attributes/point_attribute.h"
namespace draco {
// Class for generating a sequence of point ids that can be used to encode
// or decode attribute values in a specific order.
// See sequential_attribute_encoders/decoders_controller.h for more details.
class PointsSequencer {
public:
PointsSequencer() : out_point_ids_(nullptr) {}
virtual ~PointsSequencer() = default;
// Fills the |out_point_ids| with the generated sequence of point ids.
bool GenerateSequence(std::vector<PointIndex> *out_point_ids) {
out_point_ids_ = out_point_ids;
return GenerateSequenceInternal();
}
// Appends a point to the sequence.
void AddPointId(PointIndex point_id) { out_point_ids_->push_back(point_id); }
// Sets the correct mapping between point ids and value ids. I.e., the inverse
// of the |out_point_ids|. In general, |out_point_ids_| does not contain
// sufficient information to compute the inverse map, because not all point
// ids are necessarily contained within the map.
// Must be implemented for sequencers that are used by attribute decoders.
virtual bool UpdatePointToAttributeIndexMapping(PointAttribute * /* attr */) {
return false;
}
protected:
// Method that needs to be implemented by the derived classes. The
// implementation is responsible for filling |out_point_ids_| with the valid
// sequence of point ids.
virtual bool GenerateSequenceInternal() = 0;
std::vector<PointIndex> *out_point_ids() const { return out_point_ids_; }
private:
std::vector<PointIndex> *out_point_ids_;
};
} // namespace draco
#endif // DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
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