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https://git.mirrors.martin98.com/https://github.com/google/draco
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88 lines
3.3 KiB
C++
88 lines
3.3 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "compression/attributes/sequential_quantization_attribute_decoder.h"
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#include "core/quantization_utils.h"
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namespace draco {
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SequentialQuantizationAttributeDecoder::SequentialQuantizationAttributeDecoder()
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: quantization_bits_(-1), max_value_dif_(0.f) {}
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bool SequentialQuantizationAttributeDecoder::Initialize(
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PointCloudDecoder *decoder, int attribute_id) {
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if (!SequentialIntegerAttributeDecoder::Initialize(decoder, attribute_id))
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return false;
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const PointAttribute *const attribute =
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decoder->point_cloud()->attribute(attribute_id);
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// Currently we can quantize only floating point arguments.
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if (attribute->data_type() != DT_FLOAT32)
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return false;
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return true;
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}
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bool SequentialQuantizationAttributeDecoder::DecodeIntegerValues(
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const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
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if (!DecodeQuantizedDataInfo())
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return false;
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return SequentialIntegerAttributeDecoder::DecodeIntegerValues(point_ids,
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in_buffer);
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}
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bool SequentialQuantizationAttributeDecoder::StoreValues(uint32_t num_values) {
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return DequantizeValues(num_values);
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}
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bool SequentialQuantizationAttributeDecoder::DecodeQuantizedDataInfo() {
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const int num_components = attribute()->components_count();
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min_value_ = std::unique_ptr<float[]>(new float[num_components]);
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if (!decoder()->buffer()->Decode(min_value_.get(),
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sizeof(float) * num_components))
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return false;
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if (!decoder()->buffer()->Decode(&max_value_dif_))
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return false;
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uint8_t quantization_bits;
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if (!decoder()->buffer()->Decode(&quantization_bits))
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return false;
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quantization_bits_ = quantization_bits;
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return true;
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}
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bool SequentialQuantizationAttributeDecoder::DequantizeValues(
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uint32_t num_values) {
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// Convert all quantized values back to floats.
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const int32_t max_quantized_value = (1 << (quantization_bits_)) - 1;
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const int num_components = attribute()->components_count();
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const int entry_size = sizeof(float) * num_components;
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const std::unique_ptr<float[]> att_val(new float[num_components]);
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int quant_val_id = 0;
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int out_byte_pos = 0;
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Dequantizer dequantizer;
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dequantizer.Init(max_value_dif_, max_quantized_value);
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for (uint32_t i = 0; i < num_values; ++i) {
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for (int c = 0; c < num_components; ++c) {
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float value = dequantizer.DequantizeFloat(values()->at(quant_val_id++));
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value = value + min_value_[c];
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att_val[c] = value;
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}
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// Store the floating point value into the attribute buffer.
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attribute()->buffer()->Write(out_byte_pos, att_val.get(), entry_size);
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out_byte_pos += entry_size;
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}
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return true;
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}
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} // namespace draco
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