geoheif.h

/******************************************************************************
 * Project:  GeoHEIF support class
 * SPDX-License-Identifier: MIT
 ****************************************************************************/
 
#ifndef GEOHEIF_H_INCLUDED_
#define GEOHEIF_H_INCLUDED_
 
#include "gdal_pam.h"
#include "ogr_spatialref.h"
 
#include <vector>

 
namespace gdal
{
 
/*
 * GeoHEIF support implementation.
 *
 * This class provides shared implementation for OGC GeoHEIF georeferencing,
 * which is currently in draft (see OGC 24-038).
 *
 * GeoHEIF provides parsing and caching for spatial references, pixel
 * to model affine transformation, and tie-points.
 *
 * This class is only shared here to provide common usage within
 * AVIF and HEIF drivers. It is not intended to be a user-level API.
*/
class CPL_DLL GeoHEIF final
{
    mutable OGRSpatialReference m_oSRS{};
    double modelTransform[6] = {0.0};
    bool haveGCPs = false;
    std::vector<gdal::GCP> gcps;
 
  public:
    GeoHEIF();
    ~GeoHEIF();
 
    bool has_SRS() const;
    bool has_GCPs() const;
    const OGRSpatialReference *GetSpatialRef() const;
    void setModelTransformation(const uint8_t *payload, size_t length);
    CPLErr GetGeoTransform(GDALGeoTransform &gt) const;
    void addGCPs(const uint8_t *payload, size_t length);
    int GetGCPCount() const;
    const GDAL_GCP *GetGCPs();
    void extractSRS(const uint8_t *payload, size_t length) const;
    const OGRSpatialReference *GetGCPSpatialRef() const;
};

 
}  // namespace gdal
 
#endif /* GEOHEIF_H_INCLUDED_ */