g++ lesson07.cpp -o test -lSDL -lSDL_image -lSDL_ttf -lfreetype

/*This source code copyrighted by Lazy Foo' Productions (2004-2007) and may not be redestributed without written permission.*/
 
//The headers
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include <string>
 
//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;
 
//The surfaces
SDL_Surface *background = NULL;
SDL_Surface *message = NULL;
SDL_Surface *screen = NULL;
 
//The event structure
SDL_Event event;
 
//The font that's going to be used
TTF_Font *font = NULL;
 
//The color of the font
SDL_Color textColor = { 255, 255, 255 };
 
SDL_Surface *load_image( std::string filename ) 
{
    //The image that's loaded
    SDL_Surface* loadedImage = NULL;
 
    //The optimized surface that will be used
    SDL_Surface* optimizedImage = NULL;
 
    //Load the image
    loadedImage = IMG_Load( filename.c_str() );
 
    //If the image loaded
    if( loadedImage != NULL )
    {
        //Create an optimized surface
        optimizedImage = SDL_DisplayFormat( loadedImage );
 
        //Free the old surface
        SDL_FreeSurface( loadedImage );
 
        //If the surface was optimized
        if( optimizedImage != NULL )
        {
            //Color key surface
            SDL_SetColorKey( optimizedImage, SDL_RLEACCEL | SDL_SRCCOLORKEY, SDL_MapRGB( optimizedImage->format, 0, 0xFF, 0xFF ) );
        }
    }
 
    //Return the optimized surface
    return optimizedImage;
}
 
void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL )
{
    //Holds offsets
    SDL_Rect offset;
 
    //Get offsets
    offset.x = x;
    offset.y = y;
 
    //Blit
    SDL_BlitSurface( source, clip, destination, &offset );
}
 
bool init()
{
    //Initialize all SDL subsystems
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
    {
        return false;    
    }
 
    //Set up the screen
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );
 
    //If there was in error in setting up the screen
    if( screen == NULL )
    {
        return false;    
    }
 
    //Initialize SDL_ttf
    if( TTF_Init() == -1 )
    {
        return false;    
    }
 
    //Set the window caption
    SDL_WM_SetCaption( "TTF Test", NULL );
 
    //If everything initialized fine
    return true;
}
 
bool load_files()
{
    //Load the background image
    background = load_image( "background.png" );
 
    //Open the font
    font = TTF_OpenFont( "lazy.ttf", 28 );
 
    //If there was a problem in loading the background
    if( background == NULL )
    {
        return false;    
    }
 
    //If there was an error in loading the font
    if( font == NULL )
    {
        return false;
    }
 
    //If everything loaded fine
    return true;    
}
 
void clean_up()
{
    //Free the surfaces
    SDL_FreeSurface( background );
    SDL_FreeSurface( message );
 
    //Close the font that was used
    TTF_CloseFont( font );
 
    //Quit SDL_ttf
    TTF_Quit();
 
    //Quit SDL
    SDL_Quit();
}
 
int main( int argc, char* args[] )
{
    //Quit flag
    bool quit = false;
 
    //Initialize
    if( init() == false )
    {
        return 1;
    }
 
    //Load the files
    if( load_files() == false )
    {
        return 1;    
    }
 
    //Render the text
    message = TTF_RenderText_Solid( font, "The quick brown fox jumps over the lazy hound", textColor );
 
    //If there was an error in rendering the text
    if( message == NULL )
    {
        return 1;    
    }
 
    //Apply the images to the screen
    apply_surface( 0, 0, background, screen );
    apply_surface( 0, 200, message, screen );
 
    //Update the screen
    if( SDL_Flip( screen ) == -1 )
    {
        return 1;    
    }
 
    //While the user hasn't quit
    while( quit == false )
    {
        //While there's events to handle
        while( SDL_PollEvent( &event ) )
        {
            //If the user has Xed out the window
            if( event.type == SDL_QUIT )
            {
                //Quit the program
                quit = true;
            }    
        }
    }
 
    //Free surfaces and font then quit SDL_ttf and SDL 
    clean_up();
 
    return 0;    
}