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[Resolvido] SDL background não aparece


polska
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O programa apenas faz o load da imagem hello e mostra no canto superior esquerdo, mas deve mostrar ao centro sobreposta as 4 imagens de background..

#include "SDL.h"
#include <string>
/* The attributes of the screen */
const int SCREEN_WIDTH=640; // largura
const int SCREEN_HEIGHT=480; // altura
const int SCREEN_BPP=32; // bits per pixel -> 32-bit colour
/* The surfaces that will be used */
SDL_Surface* message=NULL; //hello image
SDL_Surface* screen=NULL;
SDL_Surface* background=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()); //a imagem não deve ser logo usada pois é de 24 bits e a janela(screen) é de 32 bits
/*if image sucesseful loaded*/
if(loadedImage!=NULL){
 //create an optimized image
 optimizedImage=SDL_DisplayFormat(loadedImage);
 //Free the old image -> Apagar da memória
 SDL_FreeSurface(loadedImage);
}
//return the oprimized 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,NULL);
}
int main(int argc, char* args[]) {
//START SDL, se falhar faz return 1 para fechar o programa
if(SDL_Init(SDL_INIT_EVERYTHING)==-1)
 return 1;
//Set up the screen
screen=SDL_SetVideoMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,SDL_SWSURFACE);

//Se falhar a criação do screen, fecha o programa
if(screen==NULL)
 return 1;
//Na parte superior da janela(caption), escreve Hello World
SDL_WM_SetCaption("Hello World",NULL);
//Load the images -> call funtion load_Image
message=load_Image("hello.bmp");
background=load_Image("background.bmp");
//Apply the background to the screen
apply_surface(0,0,background,screen); //canto superior esquerdo
apply_surface(320, 0, background, screen); //canto superior direito
apply_surface(0, 240, background, screen); //canto inferior esquerdo
apply_surface(320, 240, background, screen); //canto inferior direito
//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); //miliseconds
//Free the surfaces
SDL_FreeSurface(message);
SDL_FreeSurface(background);
//Quit SDL
SDL_Quit();

return 0;
}

Corrige um sábio e ele mais sábio ficará. Corrige um ignorante e um inimigo ganharás.

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