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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.
//
#include "draco/compression/attributes/sequential_normal_attribute_decoder.h"
#include "draco/attributes/attribute_octahedron_transform.h"
#include "draco/compression/attributes/normal_compression_utils.h"
namespace draco {
SequentialNormalAttributeDecoder::SequentialNormalAttributeDecoder()
: quantization_bits_(-1) {}
bool SequentialNormalAttributeDecoder::Init(PointCloudDecoder *decoder,
int attribute_id) {
if (!SequentialIntegerAttributeDecoder::Init(decoder, attribute_id))
return false;
// Currently, this encoder works only for 3-component normal vectors.
if (attribute()->num_components() != 3) {
return false;
}
// Also the data type must be DT_FLOAT32.
if (attribute()->data_type() != DT_FLOAT32) {
return false;
}
return true;
}
bool SequentialNormalAttributeDecoder::DecodeIntegerValues(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
if (decoder()->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0)) {
uint8_t quantization_bits;
if (!in_buffer->Decode(&quantization_bits)) {
return false;
}
quantization_bits_ = quantization_bits;
}
#endif
return SequentialIntegerAttributeDecoder::DecodeIntegerValues(point_ids,
in_buffer);
}
bool SequentialNormalAttributeDecoder::DecodeDataNeededByPortableTransform(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
if (decoder()->bitstream_version() >= DRACO_BITSTREAM_VERSION(2, 0)) {
// For newer file version, decode attribute transform data here.
uint8_t quantization_bits;
if (!in_buffer->Decode(&quantization_bits)) {
return false;
}
quantization_bits_ = quantization_bits;
}
// Store the decoded transform data in portable attribute.
AttributeOctahedronTransform octahedral_transform;
octahedral_transform.SetParameters(quantization_bits_);
return octahedral_transform.TransferToAttribute(portable_attribute());
}
bool SequentialNormalAttributeDecoder::StoreValues(uint32_t num_points) {
// Convert all quantized values back to floats.
const int num_components = attribute()->num_components();
const int entry_size = sizeof(float) * num_components;
float att_val[3];
int quant_val_id = 0;
int out_byte_pos = 0;
const int32_t *const portable_attribute_data = GetPortableAttributeData();
OctahedronToolBox octahedron_tool_box;
if (!octahedron_tool_box.SetQuantizationBits(quantization_bits_))
return false;
for (uint32_t i = 0; i < num_points; ++i) {
const int32_t s = portable_attribute_data[quant_val_id++];
const int32_t t = portable_attribute_data[quant_val_id++];
octahedron_tool_box.QuantizedOctaherdalCoordsToUnitVector(s, t, att_val);
// Store the decoded floating point value into the attribute buffer.
attribute()->buffer()->Write(out_byte_pos, att_val, entry_size);
out_byte_pos += entry_size;
}
return true;
}
} // namespace draco
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