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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_integer_attribute_decoder.h"
#include "draco/compression/attributes/prediction_schemes/prediction_scheme_decoder_factory.h"
#include "draco/compression/attributes/prediction_schemes/prediction_scheme_wrap_decoding_transform.h"
#include "draco/compression/entropy/symbol_decoding.h"
namespace draco {
SequentialIntegerAttributeDecoder::SequentialIntegerAttributeDecoder() {}
bool SequentialIntegerAttributeDecoder::Init(PointCloudDecoder *decoder,
int attribute_id) {
if (!SequentialAttributeDecoder::Init(decoder, attribute_id)) {
return false;
}
return true;
}
bool SequentialIntegerAttributeDecoder::TransformAttributeToOriginalFormat(
const std::vector<PointIndex> &point_ids) {
#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
if (decoder() &&
decoder()->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0)) {
return true; // Don't revert the transform here for older files.
}
#endif
return StoreValues(static_cast<uint32_t>(point_ids.size()));
}
bool SequentialIntegerAttributeDecoder::DecodeValues(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
// Decode prediction scheme.
int8_t prediction_scheme_method;
if (!in_buffer->Decode(&prediction_scheme_method)) {
return false;
}
if (prediction_scheme_method != PREDICTION_NONE) {
int8_t prediction_transform_type;
if (!in_buffer->Decode(&prediction_transform_type)) {
return false;
}
prediction_scheme_ = CreateIntPredictionScheme(
static_cast<PredictionSchemeMethod>(prediction_scheme_method),
static_cast<PredictionSchemeTransformType>(prediction_transform_type));
}
if (prediction_scheme_) {
if (!InitPredictionScheme(prediction_scheme_.get())) {
return false;
}
}
if (!DecodeIntegerValues(point_ids, in_buffer)) {
return false;
}
#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
const int32_t num_values = static_cast<uint32_t>(point_ids.size());
if (decoder() &&
decoder()->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0)) {
// For older files, revert the transform right after we decode the data.
if (!StoreValues(num_values)) {
return false;
}
}
#endif
return true;
}
std::unique_ptr<PredictionSchemeTypedDecoderInterface<int32_t>>
SequentialIntegerAttributeDecoder::CreateIntPredictionScheme(
PredictionSchemeMethod method,
PredictionSchemeTransformType transform_type) {
if (transform_type != PREDICTION_TRANSFORM_WRAP) {
return nullptr; // For now we support only wrap transform.
}
return CreatePredictionSchemeForDecoder<
int32_t, PredictionSchemeWrapDecodingTransform<int32_t>>(
method, attribute_id(), decoder());
}
bool SequentialIntegerAttributeDecoder::DecodeIntegerValues(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
const int num_components = GetNumValueComponents();
if (num_components <= 0) {
return false;
}
const size_t num_entries = point_ids.size();
const size_t num_values = num_entries * num_components;
PreparePortableAttribute(static_cast<int>(num_entries), num_components);
int32_t *const portable_attribute_data = GetPortableAttributeData();
if (portable_attribute_data == nullptr) {
return false;
}
uint8_t compressed;
if (!in_buffer->Decode(&compressed)) {
return false;
}
if (compressed > 0) {
// Decode compressed values.
if (!DecodeSymbols(static_cast<uint32_t>(num_values), num_components,
in_buffer,
reinterpret_cast<uint32_t *>(portable_attribute_data))) {
return false;
}
} else {
// Decode the integer data directly.
// Get the number of bytes for a given entry.
uint8_t num_bytes;
if (!in_buffer->Decode(&num_bytes)) {
return false;
}
if (num_bytes == DataTypeLength(DT_INT32)) {
if (portable_attribute()->buffer()->data_size() <
sizeof(int32_t) * num_values) {
return false;
}
if (!in_buffer->Decode(portable_attribute_data,
sizeof(int32_t) * num_values)) {
return false;
}
} else {
if (portable_attribute()->buffer()->data_size() <
num_bytes * num_values) {
return false;
}
if (in_buffer->remaining_size() <
static_cast<int64_t>(num_bytes) * static_cast<int64_t>(num_values)) {
return false;
}
for (size_t i = 0; i < num_values; ++i) {
if (!in_buffer->Decode(portable_attribute_data + i, num_bytes))
return false;
}
}
}
if (num_values > 0 && (prediction_scheme_ == nullptr ||
!prediction_scheme_->AreCorrectionsPositive())) {
// Convert the values back to the original signed format.
ConvertSymbolsToSignedInts(
reinterpret_cast<const uint32_t *>(portable_attribute_data),
static_cast<int>(num_values), portable_attribute_data);
}
// If the data was encoded with a prediction scheme, we must revert it.
if (prediction_scheme_) {
if (!prediction_scheme_->DecodePredictionData(in_buffer)) {
return false;
}
if (num_values > 0) {
if (!prediction_scheme_->ComputeOriginalValues(
portable_attribute_data, portable_attribute_data,
static_cast<int>(num_values), num_components, point_ids.data())) {
return false;
}
}
}
return true;
}
bool SequentialIntegerAttributeDecoder::StoreValues(uint32_t num_values) {
switch (attribute()->data_type()) {
case DT_UINT8:
StoreTypedValues<uint8_t>(num_values);
break;
case DT_INT8:
StoreTypedValues<int8_t>(num_values);
break;
case DT_UINT16:
StoreTypedValues<uint16_t>(num_values);
break;
case DT_INT16:
StoreTypedValues<int16_t>(num_values);
break;
case DT_UINT32:
StoreTypedValues<uint32_t>(num_values);
break;
case DT_INT32:
StoreTypedValues<int32_t>(num_values);
break;
default:
return false;
}
return true;
}
template <typename AttributeTypeT>
void SequentialIntegerAttributeDecoder::StoreTypedValues(uint32_t num_values) {
const int num_components = attribute()->num_components();
const int entry_size = sizeof(AttributeTypeT) * num_components;
const std::unique_ptr<AttributeTypeT[]> att_val(
new AttributeTypeT[num_components]);
const int32_t *const portable_attribute_data = GetPortableAttributeData();
int val_id = 0;
int out_byte_pos = 0;
for (uint32_t i = 0; i < num_values; ++i) {
for (int c = 0; c < num_components; ++c) {
const AttributeTypeT value =
static_cast<AttributeTypeT>(portable_attribute_data[val_id++]);
att_val[c] = value;
}
// Store the integer value into the attribute buffer.
attribute()->buffer()->Write(out_byte_pos, att_val.get(), entry_size);
out_byte_pos += entry_size;
}
}
void SequentialIntegerAttributeDecoder::PreparePortableAttribute(
int num_entries, int num_components) {
GeometryAttribute va;
va.Init(attribute()->attribute_type(), nullptr, num_components, DT_INT32,
false, num_components * DataTypeLength(DT_INT32), 0);
std::unique_ptr<PointAttribute> port_att(new PointAttribute(va));
port_att->SetIdentityMapping();
port_att->Reset(num_entries);
SetPortableAttribute(std::move(port_att));
}
} // namespace draco
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