sdl_image.cpp

#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include <string>

// screen atributes
const int SCREEN_WIDTH  = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP    = 32;

// surfaces
SDL_Surface *image  = NULL;
SDL_Surface *screen = NULL;

// function declerations
SDL_Surface *load_image(std::string filename);
bool init();
void apply_surface(Sint16 x, Sint16 y, SDL_Surface* source, SDL_Surface* destination);
void clean_up();


SDL_Surface *load_image(std::string filename){
	// where the surface is loaded to
	SDL_Surface* loadedImage = NULL;

	// optimized image, that will be used
	SDL_Surface* optimizedImage = NULL;

	// load the image using SDL_Image
	loadedImage = IMG_Load(filename.c_str());

	// checks the loaded image
	if(loadedImage != NULL){
		// create the optimized image
		optimizedImage = SDL_DisplayFormat(loadedImage);

		// free the old image
		SDL_FreeSurface(loadedImage);
	}

	return optimizedImage;
}

void apply_surface(Sint16 x, Sint16 y, SDL_Surface* source, SDL_Surface* destination){
	// make a temp rectangel to hold offsets
	SDL_Rect offset;

	// offsets of the rectangle
	offset.x = x;
	offset.y = y;

	SDL_BlitSurface(source, NULL, destination, &offset);
}

bool init(){
	// initilize all sdl
	if(SDL_Init(SDL_INIT_EVERYTHING))
		return false;

	// set up the screen
	screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);

	// check the screen
	if(screen == NULL)
		return false;

	SDL_WM_SetCaption("PNG Test", NULL);

	return true;
}

void clean_up(){
	// free surfaces
	SDL_FreeSurface(image);

	// quit sdl
	SDL_Quit();
}

int main(){
	if (init())
		return 1;

	// load the image
	image = load_image("assets/sdl_image/look.png");
	
	// apply surface
	apply_surface(0, 0, image, screen);

	// update the screen
	SDL_Flip(screen);

	// wait two seconds
	SDL_Delay(2000);

	clean_up();
	return 0;
}