tests/sdl_free_screen.cpp

// Copyright 2014 The Emscripten Authors.  All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License.  Both these licenses can be
// found in the LICENSE file.

#include <stdio.h>
#include <SDL/SDL.h>


extern "C" int main(int argc, char** argv) {

  SDL_Init(SDL_INIT_VIDEO);
  SDL_Surface *screen = SDL_SetVideoMode(256, 256, 32, SDL_SWSURFACE);
  printf("freeing screen...\n");
  SDL_FreeSurface(screen);
  printf("recreating...\n");
  screen = SDL_SetVideoMode(256, 256, 32, SDL_SWSURFACE);
  printf("seems ok!\n");

  if (SDL_MUSTLOCK(screen)) SDL_LockSurface(screen);
  for (int i = 0; i < 256; i++) {
    for (int j = 0; j < 256; j++) {
      // alpha component is actually ignored, since this is to the screen
      *((Uint32*)screen->pixels + i * 256 + j) = SDL_MapRGBA(screen->format, i, j, 255-i, (i+j) % 255);
    }
  }
  if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
  SDL_Flip(screen); 

  SDL_Quit();

  return 0;
}