void SDL_SetWindowIcon(SDL_Window*  window,
                       SDL_Surface* icon)

// Using SDL2 to set a window icon
#include <SDL2/SDL.h>   

using namespace std;

int main(int argc, char* argv[]){

  SDL_Init(SDL_INIT_VIDEO);   // Initialize SDL2

  SDL_Window *pWindow = SDL_CreateWindow(    // Open a new window
    "SDL2 window icon demo", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN|SDL_WINDOW_RESIZABLE
  );
  
  SDL_Surface *surface;     // Declare an SDL_Surface to be filled in with pixel data from an image file
  Uint16 pixels[16*16] = {  // ...or with raw pixel data.
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0aab, 0x0789, 0x0bcc, 0x0eee, 0x09aa, 0x099a, 0x0ddd, 
    0x0fff, 0x0eee, 0x0899, 0x0fff, 0x0fff, 0x1fff, 0x0dde, 0x0dee, 
    0x0fff, 0xabbc, 0xf779, 0x8cdd, 0x3fff, 0x9bbc, 0xaaab, 0x6fff, 
    0x0fff, 0x3fff, 0xbaab, 0x0fff, 0x0fff, 0x6689, 0x6fff, 0x0dee, 
    0xe678, 0xf134, 0x8abb, 0xf235, 0xf678, 0xf013, 0xf568, 0xf001, 
    0xd889, 0x7abc, 0xf001, 0x0fff, 0x0fff, 0x0bcc, 0x9124, 0x5fff, 
    0xf124, 0xf356, 0x3eee, 0x0fff, 0x7bbc, 0xf124, 0x0789, 0x2fff, 
    0xf002, 0xd789, 0xf024, 0x0fff, 0x0fff, 0x0002, 0x0134, 0xd79a, 
    0x1fff, 0xf023, 0xf000, 0xf124, 0xc99a, 0xf024, 0x0567, 0x0fff, 
    0xf002, 0xe678, 0xf013, 0x0fff, 0x0ddd, 0x0fff, 0x0fff, 0xb689, 
    0x8abb, 0x0fff, 0x0fff, 0xf001, 0xf235, 0xf013, 0x0fff, 0xd789, 
    0xf002, 0x9899, 0xf001, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0xe789, 
    0xf023, 0xf000, 0xf001, 0xe456, 0x8bcc, 0xf013, 0xf002, 0xf012, 
    0x1767, 0x5aaa, 0xf013, 0xf001, 0xf000, 0x0fff, 0x7fff, 0xf124, 
    0x0fff, 0x089a, 0x0578, 0x0fff, 0x089a, 0x0013, 0x0245, 0x0eff, 
    0x0223, 0x0dde, 0x0135, 0x0789, 0x0ddd, 0xbbbc, 0xf346, 0x0467, 
    0x0fff, 0x4eee, 0x3ddd, 0x0edd, 0x0dee, 0x0fff, 0x0fff, 0x0dee, 
    0x0def, 0x08ab, 0x0fff, 0x7fff, 0xfabc, 0xf356, 0x0457, 0x0467, 
    0x0fff, 0x0bcd, 0x4bde, 0x9bcc, 0x8dee, 0x8eff, 0x8fff, 0x9fff, 
    0xadee, 0xeccd, 0xf689, 0xc357, 0x2356, 0x0356, 0x0467, 0x0467, 
    0x0fff, 0x0ccd, 0x0bdd, 0x0cdd, 0x0aaa, 0x2234, 0x4135, 0x4346, 
    0x5356, 0x2246, 0x0346, 0x0356, 0x0467, 0x0356, 0x0467, 0x0467, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 
    0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff, 0x0fff 
  }; 
  surface = SDL_CreateRGBSurfaceFrom(pixels,16,16,16,16*2,0x0f00,0x00f0,0x000f,0xf000);
  
  
  
  SDL_SetWindowIcon(pWindow, surface); 
  // The icon is attached to the window pointer

  
  // ...and the surface containing the icon pixel data is no longer required.
  SDL_FreeSurface(surface);
  
  SDL_Event e;
  while(e.type!=SDL_QUIT) SDL_PollEvent(&e);  // Loop until the user closes the window.
  
  SDL_DestroyWindow(pWindow);   // Close and destroy the window.
  SDL_Quit();                  // Uninitialize SDL2 and exit the program.
  return 0;   
 
}