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Created attachment 308 [details]
a png with alpha channel

Possible Memory Leak rendering PNG images,the parts code of a sample is belows:
//============================================================================
/* Initialize the SDL library */
	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
		return(255);
	}

	flags = SDL_SWSURFACE;
	SDL_Surface* Surf_Temp = NULL;
		/* Open the image file */
	for(j=0;j<100;j++)
	{
		image[j]  = IMG_Load(argv[1]);	

        }

	
		/* Use the deepest native mode, except that we emulate 32bpp
		   for viewing non-indexed images on 8bpp screens */
	
	screen = SDL_SetVideoMode(720, 576, 16, flags);
	if ( screen == NULL ) {
		fprintf(stderr,"Couldn't set video mode: %s\n",
			SDL_GetError());
		return -1;
	}
#if 0		
		/* Set the palette, if one exists */
		if ( image[20]->format->palette ) {
			SDL_SetColors(screen, image[20]->format->palette->colors,
			              0, image[20]->format->palette->ncolors);
		}

		/* Draw a background pattern if the surface has transparency */
		if(image[20]->flags & (SDL_SRCALPHA | SDL_SRCCOLORKEY))
	    		draw_background(screen);
#endif
		/* Display the image */
		SDL_BlitSurface(image[20], NULL, screen, NULL);
		SDL_UpdateRect(screen,0,0,0,0);
		sleep(5);
		fprintf(stderr,"start free resource...................\n");

		for(j=0;j<100;j++)
		{
			printf("before free:image[%d].refcount is %d\n",j,image[j]->refcount); 
			SDL_FreeSurface(image[j]);
			printf("after free:image[%d].refcount is %d\n",j,image[j]->refcount);
			
		}

SDL_Quit();
...............