Easiest way to display pixels on a screen on Linux

display-pixel.cc

//g++ main.cc -O3 -o test -lX11 && ./test
#include <chrono>
#include <iostream>
#include <string>
#include "CImg.h"

using namespace cimg_library;

int main(int argc,char **argv) {
  const unsigned char white[] = { 255, 255, 255 };
  const int width  = 640;
  const int height = 480;
  // Create 3-channel RGB image
  CImg<> img(width,height, 1, 3);

  // Create main window
  CImgDisplay main_window(img, "Random Data", 0);


  float fps = 0;
  while (!main_window.is_closed()) {
    std::chrono::time_point<std::chrono::system_clock> startTime =
      std::chrono::system_clock::now();
    
    // Fill image with random noise
    img.rand(0, 255);
    // Draw in frame counter
    std::string text = "Fps: " + std::to_string(fps);
    img.draw_text(10, 10, text.c_str(), white, 0, 1, 32);
    main_window.display(img);

    float elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
      std::chrono::system_clock::now() - startTime).count();
    fps = fps * 0.9 + (1000 / elapsed) * 0.1;
  }
}