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// Copyright 2017 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/attributes/attribute_octahedron_transform.h"
#include "draco/attributes/attribute_transform_type.h"
#include "draco/compression/attributes/normal_compression_utils.h"
namespace draco {
bool AttributeOctahedronTransform::InitFromAttribute(
const PointAttribute &attribute) {
const AttributeTransformData *const transform_data =
attribute.GetAttributeTransformData();
if (!transform_data ||
transform_data->transform_type() != ATTRIBUTE_OCTAHEDRON_TRANSFORM) {
return false; // Wrong transform type.
}
quantization_bits_ = transform_data->GetParameterValue<int32_t>(0);
return true;
}
void AttributeOctahedronTransform::CopyToAttributeTransformData(
AttributeTransformData *out_data) const {
out_data->set_transform_type(ATTRIBUTE_OCTAHEDRON_TRANSFORM);
out_data->AppendParameterValue(quantization_bits_);
}
bool AttributeOctahedronTransform::TransformAttribute(
const PointAttribute &attribute, const std::vector<PointIndex> &point_ids,
PointAttribute *target_attribute) {
return GeneratePortableAttribute(attribute, point_ids,
target_attribute->size(), target_attribute);
}
bool AttributeOctahedronTransform::InverseTransformAttribute(
const PointAttribute &attribute, PointAttribute *target_attribute) {
if (target_attribute->data_type() != DT_FLOAT32) {
return false;
}
const int num_points = target_attribute->size();
const int num_components = target_attribute->num_components();
if (num_components != 3) {
return false;
}
constexpr int kEntrySize = sizeof(float) * 3;
float att_val[3];
const int32_t *source_attribute_data = reinterpret_cast<const int32_t *>(
attribute.GetAddress(AttributeValueIndex(0)));
uint8_t *target_address =
target_attribute->GetAddress(AttributeValueIndex(0));
OctahedronToolBox octahedron_tool_box;
if (!octahedron_tool_box.SetQuantizationBits(quantization_bits_)) {
return false;
}
for (uint32_t i = 0; i < num_points; ++i) {
const int32_t s = *source_attribute_data++;
const int32_t t = *source_attribute_data++;
octahedron_tool_box.QuantizedOctahedralCoordsToUnitVector(s, t, att_val);
// Store the decoded floating point values into the attribute buffer.
std::memcpy(target_address, att_val, kEntrySize);
target_address += kEntrySize;
}
return true;
}
void AttributeOctahedronTransform::SetParameters(int quantization_bits) {
quantization_bits_ = quantization_bits;
}
bool AttributeOctahedronTransform::EncodeParameters(
EncoderBuffer *encoder_buffer) const {
if (is_initialized()) {
encoder_buffer->Encode(static_cast<uint8_t>(quantization_bits_));
return true;
}
return false;
}
bool AttributeOctahedronTransform::DecodeParameters(
const PointAttribute &attribute, DecoderBuffer *decoder_buffer) {
uint8_t quantization_bits;
if (!decoder_buffer->Decode(&quantization_bits)) {
return false;
}
quantization_bits_ = quantization_bits;
return true;
}
bool AttributeOctahedronTransform::GeneratePortableAttribute(
const PointAttribute &attribute, const std::vector<PointIndex> &point_ids,
int num_points, PointAttribute *target_attribute) const {
DRACO_DCHECK(is_initialized());
// Quantize all values in the order given by point_ids into portable
// attribute.
int32_t *const portable_attribute_data = reinterpret_cast<int32_t *>(
target_attribute->GetAddress(AttributeValueIndex(0)));
float att_val[3];
int32_t dst_index = 0;
OctahedronToolBox converter;
if (!converter.SetQuantizationBits(quantization_bits_)) {
return false;
}
if (!point_ids.empty()) {
for (uint32_t i = 0; i < point_ids.size(); ++i) {
const AttributeValueIndex att_val_id =
attribute.mapped_index(point_ids[i]);
attribute.GetValue(att_val_id, att_val);
// Encode the vector into a s and t octahedral coordinates.
int32_t s, t;
converter.FloatVectorToQuantizedOctahedralCoords(att_val, &s, &t);
portable_attribute_data[dst_index++] = s;
portable_attribute_data[dst_index++] = t;
}
} else {
for (PointIndex i(0); i < num_points; ++i) {
const AttributeValueIndex att_val_id = attribute.mapped_index(i);
attribute.GetValue(att_val_id, att_val);
// Encode the vector into a s and t octahedral coordinates.
int32_t s, t;
converter.FloatVectorToQuantizedOctahedralCoords(att_val, &s, &t);
portable_attribute_data[dst_index++] = s;
portable_attribute_data[dst_index++] = t;
}
}
return true;
}
} // namespace draco
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