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