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