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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_decoder.h"
namespace draco {
SequentialAttributeDecoder::SequentialAttributeDecoder()
: decoder_(nullptr), attribute_(nullptr), attribute_id_(-1) {}
bool SequentialAttributeDecoder::Init(PointCloudDecoder *decoder,
int attribute_id) {
decoder_ = decoder;
attribute_ = decoder->point_cloud()->attribute(attribute_id);
attribute_id_ = attribute_id;
return true;
}
bool SequentialAttributeDecoder::InitializeStandalone(
PointAttribute *attribute) {
attribute_ = attribute;
attribute_id_ = -1;
return true;
}
bool SequentialAttributeDecoder::DecodePortableAttribute(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
if (attribute_->num_components() <= 0 ||
!attribute_->Reset(point_ids.size())) {
return false;
}
if (!DecodeValues(point_ids, in_buffer)) {
return false;
}
return true;
}
bool SequentialAttributeDecoder::DecodeDataNeededByPortableTransform(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
// Default implementation does not apply any transform.
return true;
}
bool SequentialAttributeDecoder::TransformAttributeToOriginalFormat(
const std::vector<PointIndex> &point_ids) {
// Default implementation does not apply any transform.
return true;
}
const PointAttribute *SequentialAttributeDecoder::GetPortableAttribute() {
// If needed, copy point to attribute value index mapping from the final
// attribute to the portable attribute.
if (!attribute_->is_mapping_identity() && portable_attribute_ &&
portable_attribute_->is_mapping_identity()) {
portable_attribute_->SetExplicitMapping(attribute_->indices_map_size());
for (PointIndex i(0);
i < static_cast<uint32_t>(attribute_->indices_map_size()); ++i) {
portable_attribute_->SetPointMapEntry(i, attribute_->mapped_index(i));
}
}
return portable_attribute_.get();
}
bool SequentialAttributeDecoder::InitPredictionScheme(
PredictionSchemeInterface *ps) {
for (int i = 0; i < ps->GetNumParentAttributes(); ++i) {
const int att_id = decoder_->point_cloud()->GetNamedAttributeId(
ps->GetParentAttributeType(i));
if (att_id == -1) {
return false; // Requested attribute does not exist.
}
#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
if (decoder_->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0)) {
if (!ps->SetParentAttribute(decoder_->point_cloud()->attribute(att_id))) {
return false;
}
} else
#endif
{
const PointAttribute *const pa = decoder_->GetPortableAttribute(att_id);
if (pa == nullptr || !ps->SetParentAttribute(pa)) {
return false;
}
}
}
return true;
}
bool SequentialAttributeDecoder::DecodeValues(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
const int32_t num_values = static_cast<uint32_t>(point_ids.size());
const int entry_size = static_cast<int>(attribute_->byte_stride());
std::unique_ptr<uint8_t[]> value_data_ptr(new uint8_t[entry_size]);
uint8_t *const value_data = value_data_ptr.get();
int out_byte_pos = 0;
// Decode raw attribute values in their original format.
for (int i = 0; i < num_values; ++i) {
if (!in_buffer->Decode(value_data, entry_size)) {
return false;
}
attribute_->buffer()->Write(out_byte_pos, value_data, entry_size);
out_byte_pos += entry_size;
}
return true;
}
} // namespace draco
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