text: #include "SDL/SDL.h"
  #include "SDL/SDL_image.h"
  #include "SDL/SDL_rotozoom.h"
  
  #ifdef EMSCRIPTEN
  #include "emscripten.h"
  #endif
  
  const int numSprites = 9;
  SDL_Surface *screen;
  SDL_Surface *sprite[numSprites];
  
  void mainloop() {
      int i;
      int row = 0;
      SDL_Rect rect = { 0, 0, 100, 100 };
      for (i = 0; i < numSprites; i++) {
          rect.x = i & 1 ? 200 : 0;
          rect.y = row * 200;
          row += i & 1;
          SDL_BlitSurface(sprite[i], 0, screen, &rect);
          SDL_UpdateRect(screen, 0, 0, 0, 0);
      }
  }
  
  int main(int argc, char **argv) {
      SDL_Init(SDL_INIT_VIDEO);
  
      const int width = 400;
      const int height = 200 * (numSprites + 1) / 2;
      screen = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE);
      SDL_Rect rect = { 0, 0, width, height };
      SDL_FillRect(screen, &rect, SDL_MapRGBA(screen->format, 0, 0, 0, 0xff));
  
      sprite[0] = IMG_Load("screenshot.png");
      sprite[1] = SDL_CreateRGBSurface(SDL_SWSURFACE, 100, 100, 32, 0xFF000000, 0xFF0000, 0xFF00, 0xFF);
      SDL_FillRect(sprite[1], 0, 0xA0A0A0A0);
      sprite[2] = zoomSurface(sprite[0], 0.5, 0.5, SMOOTHING_ON);
      sprite[3] = zoomSurface(sprite[1], 0.5, 0.5, SMOOTHING_ON);
      sprite[4] = rotozoomSurface(sprite[0], -20, 0.3, SMOOTHING_ON);
      sprite[5] = rotozoomSurface(sprite[1], 45, 0.5, SMOOTHING_ON);
      sprite[6] = zoomSurface(sprite[0], -0.5, 0.5, SMOOTHING_ON);
      sprite[7] = zoomSurface(sprite[0], -0.5, -0.5, SMOOTHING_ON);
      sprite[8] = rotozoomSurface(sprite[1], 0, 0.5, SMOOTHING_ON);
  
      mainloop();
  
  #ifndef EMSCRIPTEN
      SDL_Event evt;
      SDL_SaveBMP(screen, "native_output.bmp");
      while (1) {
         if (SDL_PollEvent(&evt) != 0 && evt.type == SDL_QUIT) break;
         //mainloop();
         SDL_Delay(33);
      }
  #endif
  
      SDL_Quit();
  
      return 1;
  }
  