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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.
//
#ifndef DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_NORMAL_OCTAHEDRON_CANONICALIZED_DECODING_TRANSFORM_H_
#define DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_NORMAL_OCTAHEDRON_CANONICALIZED_DECODING_TRANSFORM_H_
#include <cmath>
#include "draco/compression/attributes/normal_compression_utils.h"
#include "draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_canonicalized_transform_base.h"
#include "draco/core/decoder_buffer.h"
#include "draco/core/macros.h"
#include "draco/core/vector_d.h"
namespace draco {
// Class for converting correction values transformed by the canonicalized
// normal octahedron transform back to the original values. See the
// corresponding encoder for more details.
template <typename DataTypeT>
class PredictionSchemeNormalOctahedronCanonicalizedDecodingTransform
: public PredictionSchemeNormalOctahedronCanonicalizedTransformBase<
DataTypeT> {
public:
typedef VectorD<DataTypeT, 2> Point2;
typedef DataTypeT CorrType;
typedef DataTypeT DataType;
PredictionSchemeNormalOctahedronCanonicalizedDecodingTransform() {}
// Dummy to fulfill concept.
void Init(int num_components) {}
bool DecodeTransformData(DecoderBuffer *buffer) {
DataTypeT max_quantized_value, center_value;
if (!buffer->Decode(&max_quantized_value))
return false;
if (!buffer->Decode(¢er_value))
return false;
(void)center_value;
if (!this->set_max_quantized_value(max_quantized_value))
return false;
// Account for reading wrong values, e.g., due to fuzzing.
if (this->quantization_bits() < 2)
return false;
if (this->quantization_bits() > 30)
return false;
return true;
}
inline void ComputeOriginalValue(const DataType *pred_vals,
const CorrType *corr_vals,
DataType *out_orig_vals) const {
DRACO_DCHECK_LE(pred_vals[0], 2 * this->center_value());
DRACO_DCHECK_LE(pred_vals[1], 2 * this->center_value());
DRACO_DCHECK_LE(corr_vals[0], 2 * this->center_value());
DRACO_DCHECK_LE(corr_vals[1], 2 * this->center_value());
DRACO_DCHECK_LE(0, pred_vals[0]);
DRACO_DCHECK_LE(0, pred_vals[1]);
DRACO_DCHECK_LE(0, corr_vals[0]);
DRACO_DCHECK_LE(0, corr_vals[1]);
const Point2 pred = Point2(pred_vals[0], pred_vals[1]);
const Point2 corr = Point2(corr_vals[0], corr_vals[1]);
const Point2 orig = ComputeOriginalValue(pred, corr);
out_orig_vals[0] = orig[0];
out_orig_vals[1] = orig[1];
}
private:
Point2 ComputeOriginalValue(Point2 pred, Point2 corr) const {
const Point2 t(this->center_value(), this->center_value());
pred = pred - t;
const bool pred_is_in_diamond = this->IsInDiamond(pred[0], pred[1]);
if (!pred_is_in_diamond) {
this->InvertDiamond(&pred[0], &pred[1]);
}
const bool pred_is_in_bottom_left = this->IsInBottomLeft(pred);
const int32_t rotation_count = this->GetRotationCount(pred);
if (!pred_is_in_bottom_left) {
pred = this->RotatePoint(pred, rotation_count);
}
Point2 orig = pred + corr;
orig[0] = this->ModMax(orig[0]);
orig[1] = this->ModMax(orig[1]);
if (!pred_is_in_bottom_left) {
const int32_t reverse_rotation_count = (4 - rotation_count) % 4;
orig = this->RotatePoint(orig, reverse_rotation_count);
}
if (!pred_is_in_diamond) {
this->InvertDiamond(&orig[0], &orig[1]);
}
orig = orig + t;
return orig;
}
};
} // namespace draco
#endif // DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_NORMAL_OCTAHEDRON_CANONICALIZED_DECODING_TRANSFORM_H_
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