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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_attribute_encoder.h"
namespace draco {
SequentialAttributeEncoder::SequentialAttributeEncoder()
: encoder_(nullptr),
attribute_(nullptr),
attribute_id_(-1),
is_parent_encoder_(false) {}
bool SequentialAttributeEncoder::Init(PointCloudEncoder *encoder,
int attribute_id) {
encoder_ = encoder;
attribute_ = encoder_->point_cloud()->attribute(attribute_id);
attribute_id_ = attribute_id;
return true;
}
bool SequentialAttributeEncoder::InitializeStandalone(
PointAttribute *attribute) {
attribute_ = attribute;
attribute_id_ = -1;
return true;
}
bool SequentialAttributeEncoder::TransformAttributeToPortableFormat(
const std::vector<PointIndex> &point_ids) {
// Default implementation doesn't transform the input data.
return true;
}
bool SequentialAttributeEncoder::EncodePortableAttribute(
const std::vector<PointIndex> &point_ids, EncoderBuffer *out_buffer) {
// Lossless encoding of the input values.
if (!EncodeValues(point_ids, out_buffer)) {
return false;
}
return true;
}
bool SequentialAttributeEncoder::EncodeDataNeededByPortableTransform(
EncoderBuffer *out_buffer) {
// Default implementation doesn't transform the input data.
return true;
}
bool SequentialAttributeEncoder::EncodeValues(
const std::vector<PointIndex> &point_ids, EncoderBuffer *out_buffer) {
const int entry_size = static_cast<int>(attribute_->byte_stride());
const std::unique_ptr<uint8_t[]> value_data_ptr(new uint8_t[entry_size]);
uint8_t *const value_data = value_data_ptr.get();
// Encode all attribute values in their native raw format.
for (uint32_t i = 0; i < point_ids.size(); ++i) {
const AttributeValueIndex entry_id = attribute_->mapped_index(point_ids[i]);
attribute_->GetValue(entry_id, value_data);
out_buffer->Encode(value_data, entry_size);
}
return true;
}
void SequentialAttributeEncoder::MarkParentAttribute() {
is_parent_encoder_ = true;
}
bool SequentialAttributeEncoder::InitPredictionScheme(
PredictionSchemeInterface *ps) {
for (int i = 0; i < ps->GetNumParentAttributes(); ++i) {
const int att_id = encoder_->point_cloud()->GetNamedAttributeId(
ps->GetParentAttributeType(i));
if (att_id == -1) {
return false; // Requested attribute does not exist.
}
parent_attributes_.push_back(att_id);
encoder_->MarkParentAttribute(att_id);
}
return true;
}
bool SequentialAttributeEncoder::SetPredictionSchemeParentAttributes(
PredictionSchemeInterface *ps) {
for (int i = 0; i < ps->GetNumParentAttributes(); ++i) {
const int att_id = encoder_->point_cloud()->GetNamedAttributeId(
ps->GetParentAttributeType(i));
if (att_id == -1) {
return false; // Requested attribute does not exist.
}
if (!ps->SetParentAttribute(encoder_->GetPortableAttribute(att_id))) {
return false;
}
}
return true;
}
} // namespace draco
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