HilbertCode.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2020 Paul Ramsey <pramsey@cleverelephant.ca>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
 
#pragma once
 
#include <geos/export.h>
#include <string>
 
// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
}
}
 
namespace geos {
namespace shape {   // geos.shape
namespace fractal { // geos.shape.fractal
 
class GEOS_DLL HilbertCode {
 
public:
 
    static constexpr int MAX_LEVEL = 16;
 
    static geom::Coordinate decode(uint32_t level, uint32_t i);
 
    static uint32_t encode(uint32_t level, uint32_t x, uint32_t y);
 
    static uint32_t levelSize(uint32_t level);
 
    static uint32_t maxOrdinate(uint32_t level);
 
    static uint32_t level(uint32_t numPoints);
 
 
private:
 
    static uint32_t deinterleave(uint32_t x);
 
    static uint32_t interleave(uint32_t x);
 
    static uint32_t prefixScan(uint32_t x);
 
    static uint32_t descan(uint32_t x);
 
    static void checkLevel(uint32_t level);
 
 
};
 
 
} // namespace geos.shape.fractal
} // namespace geos.shape
} // namespace geos