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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/compression/attributes/normal_compression_utils.h"
namespace draco {
SequentialNormalAttributeDecoder::SequentialNormalAttributeDecoder() {}
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)) {
// Note: in older bitstreams, we do not have a PortableAttribute() decoded
// at this stage so we cannot pass it down to the DecodeParameters() call.
// It still works fine for octahedral transform because it does not need to
// use any data from the attribute.
if (!octahedral_transform_.DecodeParameters(*attribute(), in_buffer)) {
return false;
}
}
#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.
if (!octahedral_transform_.DecodeParameters(*GetPortableAttribute(),
in_buffer)) {
return false;
}
}
// Store the decoded transform data in portable attribute.
return octahedral_transform_.TransferToAttribute(portable_attribute());
}
bool SequentialNormalAttributeDecoder::StoreValues(uint32_t num_points) {
// Convert all quantized values back to floats.
return octahedral_transform_.InverseTransformAttribute(
*GetPortableAttribute(), attribute());
}
} // namespace draco
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