ecvNormalCompressor.h

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include "CV_db.h"
 
// Local
#include "ecvBasicTypes.h"
 
class CV_DB_LIB_API ccNormalCompressor {
public:
 
    static const unsigned char QUANTIZE_LEVEL =
            9;  // 2097152 normals * 12 bytes = 24 Mb of memory
 
    static const unsigned MAX_VALID_NORM_CODE =
            (1 << (QUANTIZE_LEVEL * 2 + 3)) - 1;
    static const unsigned NULL_NORM_CODE = MAX_VALID_NORM_CODE + 1;
 
    static unsigned Compress(const PointCoordinateType N[3]);
 
    static void Decompress(unsigned index,
                           PointCoordinateType N[3],
                           unsigned char level = QUANTIZE_LEVEL);
 
    static void InvertNormal(CompressedNormType &code);
};