ImageEncoding.h

#pragma once
#include <libexif/exif-data.h>
#include <optional>
#include <ostream>
#include <vector>
#include <opencv2/core.hpp>
 
namespace celantur {
 
    struct ExifMetadata {
        ExifMetadata(ExifData* data);
        ~ExifMetadata();
        ExifMetadata(const ExifMetadata&) = delete;
        ExifMetadata& operator=(const ExifMetadata&) = delete;
 
        ExifMetadata(ExifMetadata&& other) noexcept;
        ExifMetadata& operator=(ExifMetadata&& other) noexcept;
       
        void print_exif_entry(ExifEntry* entry, std::ostream& oss) const;
 
        void print_exif_content(ExifContent* content, std::ostream& oss) const;
 
        void print_debug_info(std::ostream& stream) const;
        
        int get_orientation() const;
        
        ExifData* metadata{nullptr};
    };
 
    std::vector<unsigned char> png_encode(cv::Mat image, int png_compression_level = 3);
    cv::Mat png_decode(std::vector<unsigned char> data);
    cv::Mat png_decode(const unsigned char* data, size_t size);
 
    std::vector<unsigned char> jpeg_encode(cv::Mat image, int jpeg_quality = 95, std::optional<ExifMetadata> exif_metadata = std::nullopt);
    
    cv::Mat jpeg_decode(const unsigned char* data, size_t size);
    cv::Mat jpeg_decode(std::vector<unsigned char> data);
 
    ExifMetadata jpeg_get_exif_metadata(const unsigned char* data, size_t size);
    
    cv::Mat rotate_image(const cv::Mat& image, int orientation);
}