sdl load image function

loadimage.c

//Global variables
SDL_Surface *title_screen;

int load_image(char filename[], SDL_Surface *surface) {
	
	SDL_Surface *temp;
	
	//load image 
	temp = SDL_LoadBMP(filename);
	
	if (temp == NULL) {
	
		printf("Unable to load %s.\n", filename);
		return 1;
	}
	
	/* Set the image colorkey. */
	Uint32 colorkey = SDL_MapRGB(temp->format, 255, 0, 255);
	SDL_SetColorKey(temp, SDL_SRCCOLORKEY, colorkey);

	//convert the image surface to the same type as the screen
	surface = SDL_DisplayFormat(temp);
	
	if (surface == NULL) {
	
		printf("Unable to convert bitmap.\n");
		return 1;
	}
	
	SDL_FreeSurface(temp);

	return 0;
}

main() {

		//set up SDL
		// code
		//....

		load_image("image.bmp", title_screen); //(title_screen is global)

		//more code
		//game loop ect
}