gdalorienteddataset.h

/**********************************************************************
 *
 * Project:  GDAL
 * Purpose:  Dataset that modifies the orientation of an underlying dataset
 * Author:   Even Rouault, <even dot rouault at spatialys dot com>
 *
 **********************************************************************
 * Copyright (c) 2022, Even Rouault, <even dot rouault at spatialys dot com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/
 
#ifndef GDAL_ORIENTED_DATASET_H
#define GDAL_ORIENTED_DATASET_H
 
#include "gdal_priv.h"
 
 
/************************************************************************/
/*                         GDALOrientedDataset                          */
/************************************************************************/
 
class CPL_DLL GDALOrientedDataset : public GDALDataset
{
  public:
    enum class Origin
    {
        TOP_LEFT = 1,  /* row 0 top, col 0 lhs */
        TOP_RIGHT = 2, /* row 0 top, col 0 rhs */
        BOT_RIGHT = 3, /* row 0 bottom, col 0 rhs */
        BOT_LEFT = 4,  /* row 0 bottom, col 0 lhs */
        LEFT_TOP = 5,  /* row 0 lhs, col 0 top */
        RIGHT_TOP = 6, /* row 0 rhs, col 0 top */
        RIGHT_BOT = 7, /* row 0 rhs, col 0 bottom */
        LEFT_BOT = 8,  /* row 0 lhs, col 0 bottom */
    };
 
    GDALOrientedDataset(GDALDataset *poSrcDataset, Origin eOrigin);
    GDALOrientedDataset(std::unique_ptr<GDALDataset> &&poSrcDataset,
                        Origin eOrigin);
 
    char **GetMetadataDomainList() override
    {
        return m_poSrcDS->GetMetadataDomainList();
    }
 
    CSLConstList GetMetadata(const char *pszDomain = "") override;
    const char *GetMetadataItem(const char *pszName,
                                const char *pszDomain = "") override;
 
  private:
    friend class GDALOrientedRasterBand;
 
    std::unique_ptr<GDALDataset> m_poSrcDSHolder{};
    GDALDataset *m_poSrcDS = nullptr;
    Origin m_eOrigin;
    CPLStringList m_aosSrcMD{};
    CPLStringList m_aosSrcMD_EXIF{};
 
    GDALOrientedDataset(const GDALOrientedDataset &) = delete;
    GDALOrientedDataset &operator=(const GDALOrientedDataset &) = delete;
};
 
 
#endif