help me please sd card (x) image file lcd use

[nzrobot]

https://www.instructables.com/Converting-Images-to-Flash-Memory-Iconsimages-for-/

I want to code the jpeg file like the link site above and use it for lcd. I would appreciate it if you could tell me how.
I am using nrf51822 mcu and applying GC9a01 lcd. I tried to use the jpeg file in download format after uploading it using it as a flash memory file system, but there was no way, so I tried to code the jpeg file and use it for lcd. We would appreciate it if you could fill out the example code on how to implement it.

• I am Korean and I may not be able to speak English because I use it as a Google translator.
  thank you

---

header file
/*

• start rewrite from:
• https://github.com/adafruit/Adafruit-GFX-Library.git
  */
  #ifndef ARDUINO_TFT_18BIT_H
  #define ARDUINO_TFT_18BIT_H

#include "Arduino_DataBus.h"
#include "Arduino_GFX.h"
#include "Arduino_TFT.h"

class Arduino_TFT_18bit : public Arduino_TFT
{
public:
Arduino_TFT_18bit(Arduino_DataBus *bus, int8_t rst, uint8_t r, bool ips, int16_t w, int16_t h, uint8_t col_offset1, uint8_t row_offset1, uint8_t col_offset2, uint8_t row_offset2);

void writeColor(uint16_t color) override;
void writePixelPreclipped(int16_t x, int16_t y, uint16_t color) override;
void writeRepeat(uint16_t color, uint32_t len) override;

// TFT optimization code, too big for ATMEL family
#if !defined(LITTLE_FOOT_PRINT)
void writePixels(uint16_t *data, uint32_t len) override;
void writeIndexedPixels(uint8_t *bitmap, uint16_t *color_index, uint32_t len) override;
void writeIndexedPixelsDouble(uint8_t *bitmap, uint16_t *color_index, uint32_t len) override;

void drawBitmap(int16_t x, int16_t y, const uint8_t bitmap[], int16_t w, int16_t h, uint16_t color, uint16_t bg) override;
void drawBitmap(int16_t x, int16_t y, uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg) override;
void drawGrayscaleBitmap(int16_t x, int16_t y, const uint8_t bitmap[], int16_t w, int16_t h) override;
void drawGrayscaleBitmap(int16_t x, int16_t y, uint8_t *bitmap, int16_t w, int16_t h) override;
void drawIndexedBitmap(int16_t x, int16_t y, uint8_t *bitmap, uint16_t *color_index, int16_t w, int16_t h) override;
void draw16bitRGBBitmap(int16_t x, int16_t y, const uint16_t bitmap[], int16_t w, int16_t h) override;
void draw16bitRGBBitmap(int16_t x, int16_t y, uint16_t *bitmap, int16_t w, int16_t h) override;
void draw16bitBeRGBBitmap(int16_t x, int16_t y, uint16_t *bitmap, int16_t w, int16_t h) override;
void draw24bitRGBBitmap(int16_t x, int16_t y, const uint8_t bitmap[], int16_t w, int16_t h) override;
void draw24bitRGBBitmap(int16_t x, int16_t y, uint8_t *bitmap, int16_t w, int16_t h) override;
#endif // !defined(LITTLE_FOOT_PRINT)

protected:
private:
};

#endif

[moononournation]

you may start from ImgViewer examples