ImgControl.h

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#pragma once
#ifndef __ImgControl_h
#define __ImgControl_h
#include <stdlib.h>
#include <stdint.h>

#ifdef _WIN32
#ifdef OPH_EXPORT
#define OPH_DLL __declspec(dllexport)
#else
#define OPH_DLL __declspec(dllimport)
#endif
#else
#ifdef OPH_EXPORT
#define OPH_DLL __attribute__((visibility("default")))
#else
#define OPH_DLL
#endif
#endif

namespace oph
{
    enum OPH_DLL FLIP
    {
        NONE,
        VERTICAL,
        HORIZONTAL,
        BOTH
    };

    enum OPH_DLL TYPE
    {
        BMP,
        JPG,
        PNG,
        TIFF,
        GIF
    };

    class OPH_DLL ImgControl
    {
    private:
        ImgControl();
        ~ImgControl();
        static ImgControl *instance;
        static void Destroy() {
            delete instance;
        }
    public:
        static ImgControl* getInstance() {
            if (instance == nullptr) {
                instance = new ImgControl();
                atexit(Destroy);
            }
            return instance;
        }

        // Get file size
        bool GetSize(const char* path, uint32_t *size);
        // Resize the bitmap
        bool Resize(const uint8_t* src, uint8_t* dst, const uint32_t w, const uint32_t h,
            const uint32_t neww, const uint32_t newh, const uint8_t ch);
        // Rotate the bitmap
        bool Rotate(const double rotate, const uint8_t* src, uint8_t* dst, const uint32_t w, const uint32_t h, 
            const uint32_t neww, const uint32_t newh, const uint8_t ch);
        // Flip the bitmap
        bool Flip(FLIP mode, const uint8_t* src, uint8_t* dst, const uint32_t w, const uint32_t h, 
            const uint8_t ch);
        // Crop the bitmap
        bool Crop(const uint8_t* src, uint8_t* dst, const uint32_t w, const uint32_t h, const uint8_t ch,
            const uint32_t start_x, const uint32_t start_y, const uint32_t end_x, const uint32_t end_y);

    private:
        // Get bitmap pixel size.
        uint64_t GetPixelSize(const uint32_t width, const uint32_t height, const uint8_t channel);
    };
}
#endif