#include "SDL/SDL.h"#include <string> //The attributes of the screenconst int SCREEN_WIDTH = 640;const int SCREEN_HEIGHT = 480;const int SCREEN_BPP = 32;//The surfaces that will be usedSDL_Surface *message = NULL;SDL_Surface *background = NULL; SDL_Surface *screen = NULL; SDL_Surface *load_image( std::string filename ){	//Temporary storage for the image that's loaded	SDL_Surface* loadedImage = NULL;		//The optimized image that will be used	SDL_Surface* optimizedImage = NULL; 	//Load the image	loadedImage = SDL_LoadBMP( filename.c_str() ); 	//If nothing went wrong in loading the image	if( loadedImage != NULL )	{		//Create an optimized image		optimizedImage = SDL_DisplayFormat( loadedImage );				//Free the old image		SDL_FreeSurface( loadedImage );	} 	//Return the optimized image	return optimizedImage;} void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination ){	//Make a temporary rectangle to hold the offsets	SDL_Rect offset;		//Give the offsets to the rectangle	offset.x = x;	offset.y = y; 	//Blit the surface	SDL_BlitSurface( source, NULL, destination, &offset );} int main( int argc, char* args[] ){	//Initialize all SDL subsystems 	if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )	{		return 1;	} 	//Set up the screen	screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );	//If there was an error in setting up the screen	if( screen == NULL )	{		return 1;	} 	//Set the window caption	SDL_WM_SetCaption( "Hello World", NULL ); 	//Load the images	message = load_image( "hello_world.bmp" );	background = load_image( "background.bmp" ); 	//Apply the background to the screen	apply_surface( 0, 0, background, screen ); 	//Apply the message to the screen	apply_surface( 180, 140, message, screen );	//Update the screen	if( SDL_Flip( screen ) == -1 )	{		return 1;	} 	//Wait 2 seconds	SDL_Delay( 2000 ); 		//Quit SDL	SDL_Quit(); 		//Free the surfaces	SDL_FreeSurface( message );	SDL_FreeSurface( background );	//Quit SDL	SDL_Quit();	//Return	return 0;}