qgssortedrasterblockindex.h

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/***************************************************************************
    qgssortedrasterblockindex.h
     --------------------------------------
    Date                 : September 2026
    Copyright            : (C) 2026 by Nyall Dawson
    email                : nyall.dawson@gmail.com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSSORTEDRASTERBLOCKINDEX_H
#define QGSSORTEDRASTERBLOCKINDEX_H
 
#include <variant>
 
#include "qgis.h"
#include "qgis_core.h"
#include "qgis_sip.h"
 
class QgsRasterBlock;

class CORE_EXPORT QgsSortedRasterBlockIndex
{
  public:
    QgsSortedRasterBlockIndex( const QgsRasterBlock *block );

    qgssize sortedCount() const;

    const QgsRasterBlock *block() const { return mBlock; }

    qgssize sortedIndex( qgssize rank, Qt::SortOrder order = Qt::AscendingOrder ) const;

    void sortedColumnRow( qgssize rank, int &column SIP_OUT, int &row SIP_OUT, Qt::SortOrder order = Qt::AscendingOrder ) const;

    double sortedValue( qgssize rank, Qt::SortOrder order = Qt::AscendingOrder ) const;
 
  private:
    const QgsRasterBlock *mBlock = nullptr;
 
    int mCols = 0;
    int mRows = 0;
 
    std::variant<std::vector<uint32_t>, std::vector<qgssize>> mSortedIndices;
 
    inline void indexToColumnAndRow( qgssize index, int &column, int &row ) const
    {
      column = static_cast<int>( index % mCols );
      row = static_cast<int>( index / mCols );
    }
};
 
#endif // QGSSORTEDRASTERBLOCKINDEX_H