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Diffstat (limited to 'extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_decoding_transform.h')
-rw-r--r-- | extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_decoding_transform.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_decoding_transform.h b/extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_decoding_transform.h new file mode 100644 index 00000000000..a1bc4a327ac --- /dev/null +++ b/extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_decoding_transform.h @@ -0,0 +1,103 @@ +// 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. +// +#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED +#ifndef DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_NORMAL_OCTAHEDRON_DECODING_TRANSFORM_H_ +#define DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_NORMAL_OCTAHEDRON_DECODING_TRANSFORM_H_ + +#include <cmath> + +#include "draco/compression/attributes/normal_compression_utils.h" +#include "draco/compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_transform_base.h" +#include "draco/core/decoder_buffer.h" +#include "draco/core/macros.h" +#include "draco/core/vector_d.h" +#include "draco/draco_features.h" + +namespace draco { + +// Class for converting correction values transformed by the octahedral normal +// transform back to the original values. See the corresponding encoder for more +// details. +template <typename DataTypeT> +class PredictionSchemeNormalOctahedronDecodingTransform + : public PredictionSchemeNormalOctahedronTransformBase<DataTypeT> { + public: + typedef VectorD<DataTypeT, 2> Point2; + typedef DataTypeT CorrType; + typedef DataTypeT DataType; + + PredictionSchemeNormalOctahedronDecodingTransform() {} + + // Dummy function 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->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 2)) { + if (!buffer->Decode(¢er_value)) { + return false; + } + } + (void)center_value; + return this->set_max_quantized_value(max_quantized_value); + } + + 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, const 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]); + } + Point2 orig = pred + corr; + orig[0] = this->ModMax(orig[0]); + orig[1] = this->ModMax(orig[1]); + 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_DECODING_TRANSFORM_H_ +#endif |