support_openslide.h

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/*
* ECVL - European Computer Vision Library
* Version: 1.0.3
* copyright (c) 2021, Università degli Studi di Modena e Reggio Emilia (UNIMORE), AImageLab
* Authors:
*    Costantino Grana (costantino.grana@unimore.it)
*    Federico Bolelli (federico.bolelli@unimore.it)
*    Michele Cancilla (michele.cancilla@unimore.it)
*    Laura Canalini (laura.canalini@unimore.it)
*    Stefano Allegretti (stefano.allegretti@unimore.it)
* All rights reserved.
*/

#ifndef SUPPORT_OPENSLIDE_H_
#define SUPPORT_OPENSLIDE_H_

#include "ecvl/core/filesystem.h"
#include "ecvl/core/image.h"
#include "openslide.h"

namespace ecvl
{
class OpenSlideImage
{
    openslide_t* osr_;
    const ecvl::filesystem::path filename_;
    int n_levels_;

public:
    OpenSlideImage(const ecvl::filesystem::path& filename) : filename_{ filename }
    {
        osr_ = openslide_open(filename.string().c_str());
        if (osr_ == NULL || openslide_get_error(osr_) != NULL) {
            ECVL_ERROR_CANNOT_LOAD_IMAGE;
        }
        n_levels_ = openslide_get_level_count(osr_);
    }

    int GetLevelCount() { return n_levels_; }

    void GetLevelsDimensions(std::vector<std::array<int, 2>>& levels);

    void GetLevelDownsamples(std::vector<double>& levels);

    int GetBestLevelForDownsample(const double& downsample);

    void GetProperties(Image& dst);

    bool ReadRegion(Image& dst, const int level, const std::vector<int>& dims);

    void Close()
    {
        openslide_close(osr_);
        osr_ = nullptr;
    }

    ~OpenSlideImage()
    {
        if (osr_) {
            Close();
        }
    }
};

} // namespace ecvl

#endif // SUPPORT_OPENSLIDE_H_