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// Copyright 2017 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_ATTRIBUTES_ATTRIBUTE_QUANTIZATION_TRANSFORM_H_
#define DRACO_ATTRIBUTES_ATTRIBUTE_QUANTIZATION_TRANSFORM_H_
#include <vector>
#include "draco/attributes/attribute_transform.h"
#include "draco/attributes/point_attribute.h"
#include "draco/core/encoder_buffer.h"
namespace draco {
// Attribute transform for quantized attributes.
class AttributeQuantizationTransform : public AttributeTransform {
public:
AttributeQuantizationTransform() : quantization_bits_(-1), range_(0.f) {}
// Return attribute transform type.
AttributeTransformType Type() const override {
return ATTRIBUTE_QUANTIZATION_TRANSFORM;
}
// Try to init transform from attribute.
bool InitFromAttribute(const PointAttribute &attribute) override;
// Copy parameter values into the provided AttributeTransformData instance.
void CopyToAttributeTransformData(
AttributeTransformData *out_data) const override;
bool TransformAttribute(const PointAttribute &attribute,
const std::vector<PointIndex> &point_ids,
PointAttribute *target_attribute) override;
bool InverseTransformAttribute(const PointAttribute &attribute,
PointAttribute *target_attribute) override;
bool SetParameters(int quantization_bits, const float *min_values,
int num_components, float range);
bool ComputeParameters(const PointAttribute &attribute,
const int quantization_bits);
// Encode relevant parameters into buffer.
bool EncodeParameters(EncoderBuffer *encoder_buffer) const override;
bool DecodeParameters(const PointAttribute &attribute,
DecoderBuffer *decoder_buffer) override;
int32_t quantization_bits() const { return quantization_bits_; }
float min_value(int axis) const { return min_values_[axis]; }
const std::vector<float> &min_values() const { return min_values_; }
float range() const { return range_; }
bool is_initialized() const { return quantization_bits_ != -1; }
protected:
// Create portable attribute using 1:1 mapping between points in the input and
// output attribute.
void GeneratePortableAttribute(const PointAttribute &attribute,
int num_points,
PointAttribute *target_attribute) const;
// Create portable attribute using custom mapping between input and output
// points.
void GeneratePortableAttribute(const PointAttribute &attribute,
const std::vector<PointIndex> &point_ids,
int num_points,
PointAttribute *target_attribute) const;
DataType GetTransformedDataType(
const PointAttribute &attribute) const override {
return DT_UINT32;
}
int GetTransformedNumComponents(
const PointAttribute &attribute) const override {
return attribute.num_components();
}
static bool IsQuantizationValid(int quantization_bits);
private:
int32_t quantization_bits_;
// Minimal dequantized value for each component of the attribute.
std::vector<float> min_values_;
// Bounds of the dequantized attribute (max delta over all components).
float range_;
};
} // namespace draco
#endif // DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTE_DEQUANTIZATION_TRANSFORM_H_
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