Hello!
I'm trying to make a copy of the actual screen to another SDL_Surface. I tried to use SDL_BlitSurface and SDL_DisplayFormat, rounded and non-rounded by callings of SDL_LockSurface and SDL_UnlockSurface, but I can't get the copy. I only get an empty surface.
Anyone can help me?
[SDL] How to copy the screen to another surface?
SDL_BlitSurface() should work, without SDL_LockSurface(). How are you allocating the destination surface? Have you tried checking the return value of SDL_BlitSurface(), and the value of SDL_GetError()?
Author
I did the following:
I tried to use SDL_GetError() but it didn't returned anything.
SDL_Surface *mySurface, *temp;
SDL_Rect rect;
temp = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, screen->w, screen->h, 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF);
if (temp) {
mySurface = SDL_DisplayFormat(temp);
SDL_FreeSurface(temp);
}
rect.x = 0;
rect.y = 0;
SDL_BlitSurface(screen, NULL, mySurface, &rect);I tried to use SDL_GetError() but it didn't returned anything.
SDL_CreateRGBSurface takes 8 arguments but you only pass 7 arguments. How is that possible?
SDL_DisplayFormat creates a copy so all you should have to do to create a copy of the screen surface is
SDL_DisplayFormat creates a copy so all you should have to do to create a copy of the screen surface is
mySurface = SDL_DisplayFormat(screen);
Author
Sorry, I mistyped that line:
I tried to use SDL_DisplayFormat, but no result and no error...
temp = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, screen->w, screen->h, 32, 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF);
I tried to use SDL_DisplayFormat, but no result and no error...
Author
Sorry, I just put a fragment of the code, just a explanation of what I'm doing...
It pass through the 'if'... there's no error, but it gives me a black surface.
SDL_Surface *mySurface, *temp;
SDL_Rect rect;
temp = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, screen->w, screen->h, 32, 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF);
if (temp) {
mySurface = SDL_DisplayFormat(temp);
SDL_FreeSurface(temp);
}
rect.x = 0;
rect.y = 0;
SDL_BlitSurface(screen, NULL, mySurface, &rect);
if (!mySurface) {
cerr << string(SDL_GetError()) << endl;
exit(-1);
}It pass through the 'if'... there's no error, but it gives me a black surface.
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