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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_SEQUENTIAL_INTEGER_ATTRIBUTE_ENCODER_H_
#define DRACO_COMPRESSION_ATTRIBUTES_SEQUENTIAL_INTEGER_ATTRIBUTE_ENCODER_H_
#include "draco/compression/attributes/prediction_schemes/prediction_scheme_encoder.h"
#include "draco/compression/attributes/sequential_attribute_encoder.h"
namespace draco {
// Attribute encoder designed for lossless encoding of integer attributes. The
// attribute values can be pre-processed by a prediction scheme and compressed
// with a built-in entropy coder.
class SequentialIntegerAttributeEncoder : public SequentialAttributeEncoder {
public:
SequentialIntegerAttributeEncoder();
uint8_t GetUniqueId() const override {
return SEQUENTIAL_ATTRIBUTE_ENCODER_INTEGER;
}
bool Init(PointCloudEncoder *encoder, int attribute_id) override;
bool TransformAttributeToPortableFormat(
const std::vector<PointIndex> &point_ids) override;
protected:
bool EncodeValues(const std::vector<PointIndex> &point_ids,
EncoderBuffer *out_buffer) override;
// Returns a prediction scheme that should be used for encoding of the
// integer values.
virtual std::unique_ptr<PredictionSchemeTypedEncoderInterface<int32_t>>
CreateIntPredictionScheme(PredictionSchemeMethod method);
// Prepares the integer values that are going to be encoded.
virtual bool PrepareValues(const std::vector<PointIndex> &point_ids,
int num_points);
void PreparePortableAttribute(int num_entries, int num_components,
int num_points);
int32_t *GetPortableAttributeData() {
return reinterpret_cast<int32_t *>(
portable_attribute()->GetAddress(AttributeValueIndex(0)));
}
private:
// Optional prediction scheme can be used to modify the integer values in
// order to make them easier to compress.
std::unique_ptr<PredictionSchemeTypedEncoderInterface<int32_t>>
prediction_scheme_;
};
} // namespace draco
#endif // DRACO_COMPRESSION_ATTRIBUTES_SEQUENTIAL_INTEGER_ATTRIBUTE_ENCODER_H_
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