SDL problem

riddick1

Unregistered

Post: #1

Jul 25, 2007 — 02:51 AM

which function in this code respond for showing picture on the screen
Thanks.

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

Jul 25, 2007 — 03:11 AM

SDL_BlitSurface
No problem.

riddick1

Unregistered

Post: #3

Jul 25, 2007 — 04:59 AM

Code:

SDL_Surface *obrazek;

obrazek = IMG_Load("obrazek.jpg");

    if(obrazek = NULL)

    {

               return 1;

               }

    obrazek = SDL_DisplayFormat(ekran);

    SDL_FreeSurface(ekran);

    SDL_Rect dest;

    dest.x = 150; 

    dest.y = 200;

    dest.w = obrazek->w;

    dest.h = obrazek->h;

    SDL_SetAlpha( obrazek, SDL_SRCALPHA, 255); // ustawiamy przeÅºroczystoÅ›Ä‡

    SDL_BlitSurface( obrazek, NULL, ekran, &dest); // FUNKCJA ODPOWIEDZIALANA ZA WSTAWIENIE OBRAZKA NA EKRANIE

    SDL_Flip(ekran);

this code responds for loading an image, but this image doesn't show up on the screen

sealfin

Moderator

Posts: 677
Joined: 2002.04

Post: #4

Jul 25, 2007 — 08:47 AM

Well, there are three glaring bugs which may be why your image is not be showing up on the screen:

Code:

if(obrazek [b]=[/b] NULL)

{

return 1;

}

That might be your problem.

Code:

obrazek = SDL_DisplayFormat([b]ekran[/b]);

Or that.

Code:

[b]SDL_FreeSurface(ekran);[/b]

[...]

[b]SDL_Flip(ekran);[/b]

Or that.

N.b. also, depending on the version of SDL you are using, your call to SDL_SetAlpha() could be setting the surface alpha to transparent.

Mark Bishop