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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_quantization_attribute_decoder.h"
#include "draco/core/quantization_utils.h"
namespace draco {
SequentialQuantizationAttributeDecoder::
SequentialQuantizationAttributeDecoder() {}
bool SequentialQuantizationAttributeDecoder::Init(PointCloudDecoder *decoder,
int attribute_id) {
if (!SequentialIntegerAttributeDecoder::Init(decoder, attribute_id)) {
return false;
}
const PointAttribute *const attribute =
decoder->point_cloud()->attribute(attribute_id);
// Currently we can quantize only floating point arguments.
if (attribute->data_type() != DT_FLOAT32) {
return false;
}
return true;
}
bool SequentialQuantizationAttributeDecoder::DecodeIntegerValues(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
if (decoder()->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0) &&
!DecodeQuantizedDataInfo()) {
return false;
}
#endif
return SequentialIntegerAttributeDecoder::DecodeIntegerValues(point_ids,
in_buffer);
}
bool SequentialQuantizationAttributeDecoder::
DecodeDataNeededByPortableTransform(
const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
if (decoder()->bitstream_version() >= DRACO_BITSTREAM_VERSION(2, 0)) {
// Decode quantization data here only for files with bitstream version 2.0+
if (!DecodeQuantizedDataInfo()) {
return false;
}
}
// Store the decoded transform data in portable attribute;
return quantization_transform_.TransferToAttribute(portable_attribute());
}
bool SequentialQuantizationAttributeDecoder::StoreValues(uint32_t num_points) {
return DequantizeValues(num_points);
}
bool SequentialQuantizationAttributeDecoder::DecodeQuantizedDataInfo() {
// Get attribute used as source for decoding.
auto att = GetPortableAttribute();
if (att == nullptr) {
// This should happen only in the backward compatibility mode. It will still
// work fine for this case because the only thing the quantization transform
// cares about is the number of components that is the same for both source
// and target attributes.
att = attribute();
}
return quantization_transform_.DecodeParameters(*att, decoder()->buffer());
}
bool SequentialQuantizationAttributeDecoder::DequantizeValues(
uint32_t num_values) {
// Convert all quantized values back to floats.
return quantization_transform_.InverseTransformAttribute(
*GetPortableAttribute(), attribute());
}
} // namespace draco
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