64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
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#define DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
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#include <vector>
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#include "draco/attributes/point_attribute.h"
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namespace draco {
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// Class for generating a sequence of point ids that can be used to encode
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// or decode attribute values in a specific order.
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// See sequential_attribute_encoders/decoders_controller.h for more details.
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class PointsSequencer {
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public:
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PointsSequencer() : out_point_ids_(nullptr) {}
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virtual ~PointsSequencer() = default;
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// Fills the |out_point_ids| with the generated sequence of point ids.
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bool GenerateSequence(std::vector<PointIndex> *out_point_ids) {
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out_point_ids_ = out_point_ids;
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return GenerateSequenceInternal();
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}
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// Appends a point to the sequence.
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void AddPointId(PointIndex point_id) { out_point_ids_->push_back(point_id); }
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// Sets the correct mapping between point ids and value ids. I.e., the inverse
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// of the |out_point_ids|. In general, |out_point_ids_| does not contain
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// sufficient information to compute the inverse map, because not all point
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// ids are necessarily contained within the map.
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// Must be implemented for sequencers that are used by attribute decoders.
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virtual bool UpdatePointToAttributeIndexMapping(PointAttribute * /* attr */) {
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return false;
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}
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protected:
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// Method that needs to be implemented by the derived classes. The
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// implementation is responsible for filling |out_point_ids_| with the valid
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// sequence of point ids.
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virtual bool GenerateSequenceInternal() = 0;
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std::vector<PointIndex> *out_point_ids() const { return out_point_ids_; }
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private:
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std::vector<PointIndex> *out_point_ids_;
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};
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} // namespace draco
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#endif // DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
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